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RRB JE CBT 2 Electrical Engineering Practice Paper 01 (Exam Pattern, Solved Set)

RRB JE (Junior Engineer) • 2026 • 150 Questions • Free practice with solutions

Subjects included:General Awareness (15)General Science (25)Computer Knowledge (10)Electrical Engineering (SSC JE) (100)

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Showing 150 Questions with Step-by-Step Solutions

Q1General Awareness

Medium

The Indian Railways Institute of Civil Engineering (IRICEN) is located in:

A. Pune

B. Nashik

C. Jamalpur

D. Vadodara

View answer and explanation

Correct Option: A

IRIEEN is in Nashik and IRIMEE in Jamalpur.

Q2General Awareness

Medium

The Indian Railways Institute of Mechanical and Electrical Engineering (IRIMEE) is located in:

A. Pune

B. Jamalpur

C. Secunderabad

D. Lucknow

View answer and explanation

Correct Option: B

Jamalpur is in Bihar.

Q3General Awareness

Medium

The Indian Railways Institute of Electrical Engineering (IRIEEN) is located in:

A. Jamalpur

B. Pune

C. Nashik

D. Kolkata

View answer and explanation

Correct Option: C

It trains electrical engineering officers.

Q4General Awareness

Medium

The Indian Railways Institute of Signal Engineering and Telecommunications (IRISET) is located in:

A. Pune

B. Lucknow

C. Nashik

D. Secunderabad

View answer and explanation

Correct Option: D

It trains signal and telecom staff.

Q5General Awareness

Medium

South India's first railway line, opened in 1856, ran from Royapuram (Madras) to:

A. Wallajah Road (Arcot)

B. Bengaluru

C. Tiruchirappalli

D. Pondicherry

View answer and explanation

Correct Option: A

It opened on 1 July 1856.

Q6General Awareness

Easy

The track width of Indian broad gauge is:

A. 1,435 mm

B. 1,676 mm

C. 1,000 mm

D. 762 mm

View answer and explanation

Correct Option: B

1,435 mm is standard gauge, used on metro lines.

Q7General Awareness

Easy

The track width of metre gauge is:

A. 762 mm

B. 1,676 mm

C. 1,000 mm

D. 610 mm

View answer and explanation

Correct Option: C

Most metre-gauge lines have been converted to broad gauge.

Q8General Awareness

Medium

Indian Railways electrifies its main lines at:

A. 11 kV AC, 60 Hz

B. 1,500 V DC

C. 750 V DC

D. 25 kV AC, 50 Hz

View answer and explanation

Correct Option: D

Single-phase 25 kV AC overhead traction.

Q9General Awareness

Medium

The headquarters of Konkan Railway Corporation is at:

A. CBD Belapur, Navi Mumbai

B. Goa

C. Mangaluru

D. Ratnagiri

View answer and explanation

Correct Option: A

The line runs from Roha to Thokur.

Q10General Awareness

Easy

The first line of the Delhi Metro opened in:

A. 1998

B. 2002

C. 2005

D. 2010

View answer and explanation

Correct Option: B

Shahdara to Tis Hazari, December 2002.

Q11General Awareness

Easy

The Bureau of Indian Standards (BIS) has its headquarters in:

A. Kolkata

B. Mumbai

C. New Delhi

D. Bengaluru

View answer and explanation

Correct Option: C

BIS sets Indian Standards (IS codes).

Q12General Awareness

Easy

ISO 9001 is a standard for:

A. Occupational safety

B. Environmental management

C. Information security

D. Quality management systems

View answer and explanation

Correct Option: D

ISO 14001 is for environmental management.

Q13General Awareness

Easy

The National Highways Authority of India works under the:

A. Ministry of Road Transport and Highways

B. Ministry of Railways

C. Ministry of Home Affairs

D. NITI Aayog

View answer and explanation

Correct Option: A

It develops and maintains national highways.

Q14General Awareness

Easy

The Smart Cities Mission was launched in:

A. 2012

B. 2015

C. 2018

D. 2020

View answer and explanation

Correct Option: B

On 25 June 2015.

Q15General Awareness

Medium

The AMRUT scheme mainly deals with urban:

A. Airports

B. Metro rail

C. Water supply and sewerage

D. Housing loans

View answer and explanation

Correct Option: C

Atal Mission for Rejuvenation and Urban Transformation.

Q16General Science

Medium

The dimensional formula of force is:

A. [M L⁻¹ T⁻²]

B. [M L² T⁻²]

C. [M L T⁻¹]

D. [M L T⁻²]

View answer and explanation

Correct Option: D

Force = mass x acceleration.

Q17General Science

Easy

The CGS unit of work is the:

A. Erg

B. Joule

C. Dyne

D. Watt

View answer and explanation

Correct Option: A

1 joule = 10^7 erg.

Q18General Science

Easy

One newton is equal to:

A. 10³ dyne

B. 10⁵ dyne

C. 10⁷ dyne

D. 10² dyne

View answer and explanation

Correct Option: B

1 N = 1 kg m/s^2 = 1,000 g x 100 cm/s^2.

Q19General Science

Easy

The SI unit of Young's modulus is the:

A. Joule

B. Newton

C. Pascal (N/m²)

D. Metre

View answer and explanation

Correct Option: C

It is stress divided by strain, and strain has no unit.

Q20General Science

Easy

Stress is defined as:

A. Work per unit volume

B. Change in length per unit length

C. Force times area

D. Force per unit area

View answer and explanation

Correct Option: D

Strain is the change in length per unit length.

Q21General Science

Medium

Hooke's law holds only within the:

A. Elastic limit

B. Breaking point

C. Yield point and beyond

D. Plastic range

View answer and explanation

Correct Option: A

Within it, stress is proportional to strain.

Q22General Science

Medium

The specific heat capacity of water is about:

A. 418.6 J/(kg K)

B. 4,186 J/(kg K)

C. 41.86 J/(kg K)

D. 4.186 J/(kg K)

View answer and explanation

Correct Option: B

About 4.2 kJ per kg per kelvin.

Q23General Science

Easy

The SI unit of surface tension is:

A. N m

B. N/m²

C. N/m

D. J/s

View answer and explanation

Correct Option: C

Force per unit length.

Q24General Science

Medium

The SI unit of dynamic viscosity is:

A. J/kg

B. N/m

C. m²/s

D. Pa s

View answer and explanation

Correct Option: D

Kinematic viscosity is measured in m^2/s.

Q25General Science

Medium

Bernoulli's principle is based on the conservation of:

A. Energy

B. Mass

C. Momentum

D. Charge

View answer and explanation

Correct Option: A

Pressure, kinetic and potential energy per unit volume stay constant along a streamline.

Q26General Science

Medium

Which of these does NOT obey Ohm's law?

A. A copper wire

B. A semiconductor diode

C. A nichrome wire at constant temperature

D. A carbon resistor

View answer and explanation

Correct Option: B

Its current-voltage graph is not a straight line.

Q27General Science

Easy

The resistance of a metallic conductor:

A. Does not depend on temperature

B. Decreases with temperature

C. Increases with temperature

D. Becomes zero at room temperature

View answer and explanation

Correct Option: C

Metals have a positive temperature coefficient.

Q28General Science

Medium

The electric field inside a charged hollow conductor is:

A. Infinite

B. Maximum

C. Equal to that at the surface

D. Zero

View answer and explanation

Correct Option: D

Charge resides on the outer surface.

Q29General Science

Easy

The SI unit of capacitance is the:

A. Farad

B. Henry

C. Ohm

D. Tesla

View answer and explanation

Correct Option: A

1 farad = 1 coulomb per volt.

Q30General Science

Medium

Lenz's law is a consequence of the conservation of:

A. Charge

B. Energy

C. Momentum

D. Mass

View answer and explanation

Correct Option: B

The induced current opposes the change that produces it.

Q31Computer Knowledge

Easy

CPU stands for:

A. Central Processing Unit

B. Central Program Unit

C. Computer Processing Unit

D. Control Processing Utility

View answer and explanation

Correct Option: A

It carries out instructions.

Q32Computer Knowledge

Easy

Which memory loses its contents when power is switched off?

A. ROM

B. RAM

C. Hard disk

D. Pen drive

View answer and explanation

Correct Option: B

RAM is volatile.

Q33Computer Knowledge

Easy

ROM is:

A. An input device

B. Volatile memory

C. Non-volatile, read-only memory

D. A type of printer

View answer and explanation

Correct Option: C

It stores firmware such as the BIOS.

Q34Computer Knowledge

Easy

1 kilobyte (KB) is equal to:

A. 100 bytes

B. 1,000 bits

C. 1,024 bits

D. 1,024 bytes

View answer and explanation

Correct Option: D

2^10 bytes.

Q35Computer Knowledge

Easy

1 byte is equal to:

A. 8 bits

B. 4 bits

C. 16 bits

D. 10 bits

View answer and explanation

Correct Option: A

A bit is a single 0 or 1.

Q36Computer Knowledge

Easy

The binary form of decimal 10 is:

A. 1001

B. 1010

C. 1100

D. 0110

View answer and explanation

Correct Option: B

8 + 2 = 10.

Q37Computer Knowledge

Easy

The decimal value of binary 1101 is:

A. 14

B. 11

C. 13

D. 12

View answer and explanation

Correct Option: C

8 + 4 + 0 + 1 = 13.

Q38Computer Knowledge

Easy

Which of these is an input device?

A. Speaker

B. Monitor

C. Printer

D. Keyboard

View answer and explanation

Correct Option: D

The others are output devices.

Q39Computer Knowledge

Easy

Which of these is an output device?

A. Printer

B. Mouse

C. Scanner

D. Keyboard

View answer and explanation

Correct Option: A

It gives information out of the computer.

Q40Computer Knowledge

Easy

Which of these is an operating system?

A. MS Word

B. Linux

C. Google Chrome

D. Oracle Database

View answer and explanation

Correct Option: B

Windows, Linux and macOS are operating systems.

Q41General Science

Easy

Global warming is mainly caused by:

A. Nitrogen in the air

B. Oxygen in the air

C. Greenhouse gases such as carbon dioxide

D. Ozone in the stratosphere

View answer and explanation

Correct Option: C

They trap heat radiated by the Earth.

Q42General Science

Medium

The Kyoto Protocol deals with:

A. Wetland conservation

B. Protecting the ozone layer

C. Trade in endangered species

D. Reducing greenhouse gas emissions

View answer and explanation

Correct Option: D

Adopted in 1997.

Q43General Science

Medium

The Montreal Protocol deals with:

A. Ozone-depleting substances

B. Greenhouse gases

C. Plastic waste

D. Biodiversity

View answer and explanation

Correct Option: A

It phased out CFCs.

Q44General Science

Medium

The Paris Agreement aims to limit global warming to:

A. Exactly 4 °C

B. Well below 2 °C above pre-industrial levels

C. 0 °C

D. 5 °C by 2100

View answer and explanation

Correct Option: B

With efforts to limit it to 1.5 °C.

Q45General Science

Medium

BOD (Biochemical Oxygen Demand) of water indicates the amount of:

A. Heavy metals

B. Dissolved salts

C. Organic pollution that microbes break down

D. Radioactivity

View answer and explanation

Correct Option: C

It is the oxygen used by microbes to decompose organic matter.

Q46General Science

Easy

A high BOD value means the water is:

A. Colder

B. Cleaner

C. Softer

D. More polluted

View answer and explanation

Correct Option: D

More organic matter is present.

Q47General Science

Easy

PM2.5 refers to particulate matter with a diameter of:

A. 2.5 micrometres or less

B. 2.5 millimetres or less

C. 25 micrometres or more

D. 2.5 centimetres

View answer and explanation

Correct Option: A

These fine particles go deep into the lungs.

Q48General Science

Easy

Noise is measured in:

A. Hertz

B. Decibels

C. Lux

D. Pascals

View answer and explanation

Correct Option: B

A logarithmic scale.

Q49General Science

Medium

The CPCB daytime ambient noise limit for residential areas is:

A. 65 dB(A)

B. 75 dB(A)

C. 55 dB(A)

D. 45 dB(A)

View answer and explanation

Correct Option: C

The night-time limit is 45 dB(A).

Q50General Science

Medium

Which device removes fine particles from chimney gases using an electric charge?

A. Cyclone fan

B. Scrubber only

C. Catalytic converter

D. Electrostatic precipitator

View answer and explanation

Correct Option: D

Charged particles stick to collecting plates.

Q51Electrical Engineering (SSC JE)

Easy

A 12 V battery is connected across a 4 Ω resistor. The current drawn is

A. 3 A

B. 48 A

C. 8 A

D. 0.33 A

View answer and explanation

Correct Option: A

By Ohm’s law I = V/R = 12/4 = 3 A.

Q52Electrical Engineering (SSC JE)

Easy

A heater rated 230 V, 1150 W has a resistance of

A. 5 Ω

B. 26 450 Ω

C. 0.2 Ω

D. 46 Ω

View answer and explanation

Correct Option: D

R = V²/P = 230² / 1150 = 52 900 / 1150 = 46 Ω.

Q53Electrical Engineering (SSC JE)

Hard

The length of a wire is doubled and its diameter is halved. Its resistance becomes

A. 4 times

B. 16 times

C. 2 times

D. 8 times

View answer and explanation

Correct Option: D

R = ρl/A. Length ×2 and area ÷4 (area ∝ d²) give R × 2 × 4 = 8 times.

Q54Electrical Engineering (SSC JE)

Easy

Two resistors of 10 Ω and 15 Ω are connected in parallel. The equivalent resistance is

A. 150 Ω

B. 25 Ω

C. 6 Ω

D. 12.5 Ω

View answer and explanation

Correct Option: C

R = (10 × 15)/(10 + 15) = 150/25 = 6 Ω.

Q55Electrical Engineering (SSC JE)

Easy

Kirchhoff’s current law is based on the law of conservation of

A. charge

B. mass of the conductor

C. energy

D. momentum

View answer and explanation

Correct Option: A

At a node, the charge entering equals the charge leaving, so the algebraic sum of currents is zero.

Q56Electrical Engineering (SSC JE)

Easy

One kilowatt-hour is equal to

A. 3600 J

B. 360 MJ

C. 36 kJ

D. 3.6 MJ

View answer and explanation

Correct Option: D

1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J.

Q57Electrical Engineering (SSC JE)

Easy

The energy stored in a 100 μF capacitor charged to 100 V is

A. 1 J

B. 5 J

C. 0.05 J

D. 0.5 J

View answer and explanation

Correct Option: D

E = ½CV² = 0.5 × 100 × 10⁻⁶ × 10⁴ = 0.5 J.

Q58Electrical Engineering (SSC JE)

Easy

The temperature coefficient of resistance of a semiconductor is

A. positive

B. infinite

C. zero

D. negative

View answer and explanation

Correct Option: D

Heating frees more charge carriers in a semiconductor, so its resistance falls as temperature rises. In metals it rises.

Q59Electrical Engineering (SSC JE)

Easy

The energy stored in an inductor of 2 H carrying 3 A is

A. 12 J

B. 9 J

C. 18 J

D. 6 J

View answer and explanation

Correct Option: B

E = ½LI² = 0.5 × 2 × 9 = 9 J.

Q60Electrical Engineering (SSC JE)

Easy

The time constant of a series RL circuit with R = 10 Ω and L = 0.5 H is

A. 0.05 s

B. 0.5 s

C. 20 s

D. 5 s

View answer and explanation

Correct Option: A

τ = L/R = 0.5/10 = 0.05 s.

Q61Electrical Engineering (SSC JE)

Easy

The SI unit of conductance is

A. siemens

B. henry

C. weber

D. ohm

View answer and explanation

Correct Option: A

Conductance G = 1/R and is measured in siemens (formerly mho).

Q62Electrical Engineering (SSC JE)

Easy

The magnitude of the charge on an electron is approximately

A. 9.1 × 10⁻¹⁹ coulomb

B. 6.02 × 10²³ coulomb

C. 1.6 × 10⁻³¹ coulomb

D. 1.6 × 10⁻¹⁹ coulomb

View answer and explanation

Correct Option: D

1.6 × 10⁻¹⁹ C is the elementary charge. 9.1 × 10⁻³¹ kg is the mass of an electron.

Q63Electrical Engineering (SSC JE)

Easy

Thevenin’s equivalent of a linear network at a pair of terminals consists of

A. two voltage sources in parallel

B. a voltage source in series with a resistance

C. a current source in parallel with a resistance

D. a resistance only

View answer and explanation

Correct Option: B

The source voltage is the open-circuit voltage and the resistance is that seen into the terminals with the sources deactivated.

Q64Electrical Engineering (SSC JE)

Hard

A source of 12 V with an internal resistance of 4 Ω supplies a variable load. The maximum power that can be delivered to the load is

A. 9 W

B. 3 W

C. 18 W

D. 36 W

View answer and explanation

Correct Option: A

Maximum power occurs at RL = 4 Ω: P = V²/(4R) = 144/16 = 9 W.

Q65Electrical Engineering (SSC JE)

Easy

Three resistors of 9 Ω each are connected in delta. The equivalent star resistance of each arm is

A. 27 Ω

B. 6 Ω

C. 3 Ω

D. 9 Ω

View answer and explanation

Correct Option: C

In the delta-star conversion with equal resistances, R_star = R_delta/3 = 3 Ω.

Q66Electrical Engineering (SSC JE)

Hard

A series RLC circuit has L = 1 mH and C = 1 μF. The resonant frequency is about

A. 1 kHz

B. 5.03 kHz

C. 15.9 kHz

D. 159 Hz

View answer and explanation

Correct Option: B

f0 = 1 / (2π√(LC)) = 1 / (2π × √(10⁻⁹)) = 1/(2π × 3.162 × 10⁻⁵) = 5033 Hz.

Q67Electrical Engineering (SSC JE)

Easy

A series circuit has R = 3 Ω and XL = 4 Ω. Its power factor is

A. 0.75 lagging

B. 0.6 lagging

C. 0.8 lagging

D. unity

View answer and explanation

Correct Option: B

|Z| = √(9 + 16) = 5 Ω and cos φ = R/|Z| = 3/5 = 0.6.

Q68Electrical Engineering (SSC JE)

Easy

In a balanced star connection, the line voltage is related to the phase voltage as

A. VL = √3 Vph

B. VL = Vph / √3

C. VL = 3 Vph

D. VL = Vph

View answer and explanation

Correct Option: A

The line voltage is the phasor difference of two phase voltages 120° apart, which gives √3 times the phase voltage.

Q69Electrical Engineering (SSC JE)

Hard

A balanced three-phase load takes a line current of 10 A at 400 V line voltage with a power factor of 0.8. The total real power is about

A. 5.54 kW

B. 3.2 kW

C. 4.0 kW

D. 9.6 kW

View answer and explanation

Correct Option: A

P = √3 VL IL cos φ = 1.732 × 400 × 10 × 0.8 = 5542 W.

Q70Electrical Engineering (SSC JE)

Easy

A sinusoidal voltage has a peak value of 325 V. Its RMS value is about

A. 230 V

B. 460 V

C. 162 V

D. 325 V

View answer and explanation

Correct Option: A

Vrms = Vm/√2 = 325/1.414 = 229.8 V.

Q71Electrical Engineering (SSC JE)

Easy

The form factor of a sinusoidal waveform is

A. 1.11

B. 1.414

C. 1.57

D. 0.707

View answer and explanation

Correct Option: A

Form factor = RMS value / average value = 0.707 Vm / 0.637 Vm = 1.11.

Q72Electrical Engineering (SSC JE)

Easy

At the instant of switching on a circuit, an uncharged capacitor behaves as

A. a short circuit

B. an infinite resistance

C. a voltage source

D. an open circuit

View answer and explanation

Correct Option: A

With zero initial voltage and a changing current, the capacitor initially passes current freely, like a short circuit.

Q73Electrical Engineering (SSC JE)

Easy

Kirchhoff’s voltage law is based on the conservation of

A. charge

B. momentum

C. energy

D. mass

View answer and explanation

Correct Option: C

The algebraic sum of voltage rises and drops around a closed loop is zero.

Q74Electrical Engineering (SSC JE)

Easy

Nodal analysis of a network is based on

A. Norton’s theorem

B. Kirchhoff’s current law

C. Kirchhoff’s voltage law

D. Thevenin’s theorem

View answer and explanation

Correct Option: B

Node voltages are the unknowns, and KCL is written at each node.

Q75Electrical Engineering (SSC JE)

Easy

The superposition theorem is applicable to

A. unilateral networks only

B. linear bilateral networks

C. non-linear networks

D. networks with diodes only

View answer and explanation

Correct Option: B

It requires linearity. Power cannot be superposed because it is not linear in the voltage or current.

Q76Electrical Engineering (SSC JE)

Medium

In the two-wattmeter method of measuring three-phase power, at unity power factor the two wattmeters read

A. equal values with opposite signs

B. equal values

C. zero and the total power

D. one reads three times the other

View answer and explanation

Correct Option: B

W1 = W2 = VL IL cos 30° when the power factor is unity. At 0.5 lagging, one wattmeter reads zero.

Q77Electrical Engineering (SSC JE)

Easy

A coil of 100 turns links a flux that changes by 0.02 Wb in 0.1 s. The induced emf is

A. 2 V

B. 20 V

C. 200 V

D. 0.2 V

View answer and explanation

Correct Option: B

e = N dΦ/dt = 100 × 0.02 / 0.1 = 20 V.

Q78Electrical Engineering (SSC JE)

Easy

Lenz’s law is a consequence of the law of conservation of

A. charge

B. mass

C. angular momentum

D. energy

View answer and explanation

Correct Option: D

The induced current opposes the change causing it. If it aided the change, energy would be created from nothing.

Q79Electrical Engineering (SSC JE)

Easy

The SI unit of magnetic flux density is

A. henry

B. weber

C. ampere-turn

D. tesla

View answer and explanation

Correct Option: D

One tesla is one weber per square metre.

Q80Electrical Engineering (SSC JE)

Easy

The reluctance of a magnetic circuit is analogous to which quantity in an electric circuit?

A. conductance

B. current

C. voltage

D. resistance

View answer and explanation

Correct Option: D

S = l/(μA) is analogous to R = l/(σA). MMF is analogous to emf and flux is analogous to current.

Q81Electrical Engineering (SSC JE)

Hard

A 4-pole DC generator has a wave winding with 500 conductors and a flux of 0.02 Wb per pole. At 1200 rpm, the generated emf is

A. 200 V

B. 800 V

C. 400 V

D. 100 V

View answer and explanation

Correct Option: C

E = Φ Z N P / (60 A). For wave winding A = 2: E = 0.02 × 500 × 1200 × 4 / (60 × 2) = 400 V.

Q82Electrical Engineering (SSC JE)

Easy

A DC motor is supplied at 220 V and takes an armature current of 20 A. The armature resistance is 0.5 Ω. The back emf is

A. 230 V

B. 219 V

C. 210 V

D. 200 V

View answer and explanation

Correct Option: C

Eb = V − Ia Ra = 220 − 20 × 0.5 = 210 V.

Q83Electrical Engineering (SSC JE)

Easy

The speed of a DC shunt motor can be increased above its normal speed by

A. increasing the armature resistance

B. reducing the armature voltage

C. increasing the field flux

D. reducing the field flux

View answer and explanation

Correct Option: D

N ∝ Eb/Φ, so weakening the field raises the speed (field control).

Q84Electrical Engineering (SSC JE)

Easy

A DC series motor should never be started without a load because

A. its torque would be too low

B. its speed would become dangerously high

C. it would draw no current

D. its field would burn out

View answer and explanation

Correct Option: B

With no load, the armature current and the flux are both small, and the speed rises to a very high value.

Q85Electrical Engineering (SSC JE)

Easy

The emf equation of a transformer is

A. E = 2.22 f N Φm

B. E = 4.44 f N Φm

C. E = 1.11 f N Φm

D. E = 4.44 f N² Φm

View answer and explanation

Correct Option: B

E_rms = 4.44 f N Φm, where Φm is the maximum core flux.

Q86Electrical Engineering (SSC JE)

Easy

A transformer has a primary voltage of 11 kV and a secondary voltage of 400 V. If the primary has 1100 turns, the secondary has

A. 400 turns

B. 30 turns

C. 40 turns

D. 4 turns

View answer and explanation

Correct Option: C

N2 = N1 × V2/V1 = 1100 × 400/11 000 = 40 turns.

Q87Electrical Engineering (SSC JE)

Easy

The open circuit test on a transformer gives

A. the regulation at unity power factor

B. the copper loss

C. the iron (core) loss

D. the efficiency at full load

View answer and explanation

Correct Option: C

At no load, the current is small, so copper loss is negligible and the input power is the core loss.

Q88Electrical Engineering (SSC JE)

Easy

The efficiency of a transformer is maximum when

A. copper loss is zero

B. iron loss is zero

C. copper loss equals iron loss

D. the load is zero

View answer and explanation

Correct Option: C

Iron loss is constant and copper loss varies with the square of the load. The efficiency peaks when the two are equal.

Q89Electrical Engineering (SSC JE)

Medium

An autotransformer is most economical compared to a two-winding transformer when the transformation ratio is

A. close to 1

B. zero

C. exactly 10

D. much greater than 10

View answer and explanation

Correct Option: A

With K = V1/V2 (greater than 1), the copper saved is a fraction 1/K of that in the two-winding transformer. The saving is therefore greatest when K is close to 1.

Q90Electrical Engineering (SSC JE)

Easy

An induction motor runs at 1440 rpm on a 50 Hz supply with 4 poles. The slip is

A. 2.5 percent

B. 6 percent

C. 4 percent

D. 40 percent

View answer and explanation

Correct Option: C

Ns = 120 × 50/4 = 1500 rpm. s = (1500 − 1440)/1500 = 0.04.

Q91Electrical Engineering (SSC JE)

Easy

The synchronous speed of a 6-pole machine on a 50 Hz supply is

A. 1000 rpm

B. 3000 rpm

C. 1500 rpm

D. 500 rpm

View answer and explanation

Correct Option: A

Ns = 120 f / P = 120 × 50 / 6 = 1000 rpm.

Q92Electrical Engineering (SSC JE)

Easy

The frequency of the rotor current of an induction motor at a slip of 0.04 on a 50 Hz supply is

A. 1 Hz

B. 50 Hz

C. 2 Hz

D. 4 Hz

View answer and explanation

Correct Option: C

fr = s f = 0.04 × 50 = 2 Hz.

Q93Electrical Engineering (SSC JE)

Easy

Star-delta starting of a three-phase induction motor reduces the starting line current to

A. one-half of the direct on-line value

B. equal to the direct on-line value

C. one-ninth of the direct on-line value

D. one-third of the direct on-line value

View answer and explanation

Correct Option: D

In star, the phase voltage is 1/√3 of the line voltage, so the line current falls to 1/3.

Q94Electrical Engineering (SSC JE)

Medium

An over-excited synchronous motor operates at

A. zero power factor lagging only

B. a lagging power factor

C. a leading power factor

D. a power factor of zero

View answer and explanation

Correct Option: C

An over-excited motor supplies reactive power to the system, so it acts like a capacitor (synchronous condenser).

Q95Electrical Engineering (SSC JE)

Medium

The voltage regulation of an alternator is highest for a load of

A. lagging power factor

B. zero power

C. leading power factor

D. unity power factor

View answer and explanation

Correct Option: A

For a lagging load, armature reaction is demagnetising, and the terminal voltage falls the most.

Q96Electrical Engineering (SSC JE)

Easy

A single-phase induction motor is not self-starting because the stator field is

A. zero at all times

B. pulsating and not rotating

C. direct current

D. rotating at twice the speed

View answer and explanation

Correct Option: B

A pulsating field can be resolved into two equal and opposite rotating fields that give no net torque at standstill.

Q97Electrical Engineering (SSC JE)

Easy

A universal motor can operate on

A. ac supply only at a fixed frequency

B. three-phase supply only

C. both ac and dc supplies

D. dc supply only

View answer and explanation

Correct Option: C

It is a series-wound motor, whose torque direction does not change when the supply polarity reverses.

Q98Electrical Engineering (SSC JE)

Easy

Interpoles in a DC machine are provided to

A. increase the main flux

B. reduce the iron loss

C. increase the number of poles

D. improve commutation and reduce sparking

View answer and explanation

Correct Option: D

They produce a flux that induces an emf in the coil under commutation which opposes the reactance voltage.

Q99Electrical Engineering (SSC JE)

Easy

For the same power transmitted at the same power factor, if the transmission voltage is doubled, the line loss becomes

A. one-fourth

B. one-half

C. one-eighth

D. double

View answer and explanation

Correct Option: A

For a fixed power, I ∝ 1/V, so I²R falls to one-fourth.

Q100Electrical Engineering (SSC JE)

Easy

The skin effect in a conductor carrying alternating current increases with

A. the length of the conductor

B. the lowering of the temperature only

C. the resistivity of the conductor

D. the frequency of the current

View answer and explanation

Correct Option: D

At higher frequencies the current crowds toward the surface, so the effective resistance rises.

Q101Electrical Engineering (SSC JE)

Easy

Corona on an overhead line starts when the potential gradient at the conductor surface exceeds about

A. 3 kV/cm

B. 30 kV/cm (peak) in air

C. 300 kV/cm

D. 3000 kV/cm

View answer and explanation

Correct Option: B

The dielectric strength of air at normal conditions is about 30 kV/cm peak (21.1 kV/cm rms). Beyond that the air ionises.

Q102Electrical Engineering (SSC JE)

Easy

The string efficiency of a string of suspension insulators is always

A. equal to 200 percent

B. less than 100 percent

C. equal to 100 percent

D. more than 100 percent

View answer and explanation

Correct Option: B

The voltage across the units is not equal, with the unit nearest the conductor taking the most. So the efficiency is below 100 percent.

Q103Electrical Engineering (SSC JE)

Hard

The span of an overhead line is 200 m, the weight per metre of conductor is 1.5 kg and the working tension is 1500 kg. The sag is

A. 7.5 m

B. 5 m

C. 10 m

D. 2.5 m

View answer and explanation

Correct Option: B

S = wl²/8T = 1.5 × 200² / (8 × 1500) = 60 000 / 12 000 = 5 m.

Q104Electrical Engineering (SSC JE)

Hard

A generator has a reactance of 0.2 pu on a 50 MVA base. Its reactance on a 100 MVA base at the same voltage is

A. 0.4 pu

B. 0.8 pu

C. 0.2 pu

D. 0.1 pu

View answer and explanation

Correct Option: A

Z_new = Z_old × (MVA_new / MVA_old) = 0.2 × 100/50 = 0.4 pu.

Q105Electrical Engineering (SSC JE)

Easy

SF6 gas is used in high voltage circuit breakers because it has

A. high dielectric strength and excellent arc quenching properties

B. a high electrical conductivity

C. high combustibility

D. a very low density

View answer and explanation

Correct Option: A

SF6 is electronegative; it captures free electrons and rapidly restores insulation after current zero.

Q106Electrical Engineering (SSC JE)

Easy

The Buchholz relay is used for the protection of

A. alternators against overspeed

B. transmission lines against lightning

C. induction motors against overload

D. oil-filled transformers against internal faults

View answer and explanation

Correct Option: D

It is placed in the pipe between the tank and the conservator and responds to gas from faults or a surge of oil.

Q107Electrical Engineering (SSC JE)

Easy

A lightning arrester is connected

A. between two phases

B. between the line and earth

C. in series with the line

D. across the transformer secondary only

View answer and explanation

Correct Option: B

It offers a low-resistance path to earth during a surge and restores a high resistance once the voltage returns to normal.

Q108Electrical Engineering (SSC JE)

Easy

The power factor of an inductive load is improved by connecting

A. a diode in series with it

B. a capacitor in parallel with it

C. a resistor in series with it

D. an inductor in parallel with it

View answer and explanation

Correct Option: B

The capacitor supplies the reactive current that the inductive load needs, so the supply current falls.

Q109Electrical Engineering (SSC JE)

Easy

Compared with a radial distribution system, a ring main system

A. costs less

B. uses a single feeding path

C. gives better continuity of supply

D. has a poorer voltage regulation

View answer and explanation

Correct Option: C

In a ring each load can be fed from two directions, so a fault in one section does not cut off the supply.

Q110Electrical Engineering (SSC JE)

Hard

A consumer has a maximum demand of 100 kW and uses 1800 kWh in a day. The daily load factor is

A. 0.18

B. 1.33

C. 0.5

D. 0.75

View answer and explanation

Correct Option: D

Load factor = average load / maximum demand = (1800/24)/100 = 75/100 = 0.75.

Q111Electrical Engineering (SSC JE)

Medium

The diversity factor of a group of consumers is always

A. less than 1

B. between 0 and 1

C. greater than or equal to 1

D. equal to 0

View answer and explanation

Correct Option: C

It is the sum of the individual maximum demands divided by the maximum demand of the group, and the group maximum can never exceed the sum.

Q112Electrical Engineering (SSC JE)

Easy

A pumped storage hydro plant is mainly used to meet

A. base load

B. peak load

C. a constant load throughout the day

D. emergency only

View answer and explanation

Correct Option: B

Water is pumped up during off-peak hours and released through the turbines at peak demand.

Q113Electrical Engineering (SSC JE)

Easy

A permanent magnet moving coil (PMMC) instrument can be used on

A. ac only

B. high frequency ac only

C. dc only

D. both ac and dc

View answer and explanation

Correct Option: C

The deflection torque depends on the direction of the current, so on ac it would just vibrate with a zero mean reading.

Q114Electrical Engineering (SSC JE)

Medium

A dynamometer type wattmeter can be used to measure power in

A. only when the frequency is above 1 kHz

B. both ac and dc circuits

C. dc circuits only

D. ac circuits only

View answer and explanation

Correct Option: B

Its fixed coils carry the load current and the moving coil carries a current proportional to the voltage, so the torque is proportional to power.

Q115Electrical Engineering (SSC JE)

Hard

A galvanometer of 5 Ω resistance gives full-scale deflection at 50 mA. The shunt needed to convert it to a 5 A ammeter is about

A. 0.0505 Ω

B. 0.005 Ω

C. 5 Ω

D. 0.5 Ω

View answer and explanation

Correct Option: A

Rsh = Ig Rg / (I − Ig) = 0.05 × 5 / 4.95 = 0.0505 Ω.

Q116Electrical Engineering (SSC JE)

Hard

A meter with a full-scale current of 1 mA and a resistance of 100 Ω is to be used as a 100 V voltmeter. The series resistance needed is

A. 100 000 Ω

B. 1000 Ω

C. 99 900 Ω

D. 9900 Ω

View answer and explanation

Correct Option: C

Rs = V/Ig − Rg = 100/0.001 − 100 = 99 900 Ω.

Q117Electrical Engineering (SSC JE)

Easy

Creeping in an energy meter is

A. the vibration of the disc

B. the fast rotation of the disc at full load

C. the stopping of the disc at low loads

D. the slow rotation of the disc with the pressure coil energised and no load current

View answer and explanation

Correct Option: D

It is caused by over-compensation of friction and is prevented by drilling holes or fixing a small projection on the disc.

Q118Electrical Engineering (SSC JE)

Hard

In a balanced Wheatstone bridge, P = 100 Ω, Q = 1000 Ω and S = 500 Ω. The unknown R (in the arm that balances P/Q = R/S) is

A. 50 Ω

B. 500 Ω

C. 5000 Ω

D. 5 Ω

View answer and explanation

Correct Option: A

At balance P/Q = R/S, so R = S × P/Q = 500 × 100/1000 = 50 Ω.

Q119Electrical Engineering (SSC JE)

Easy

A megger is used to measure

A. insulation resistance

B. the frequency

C. the power factor

D. low resistance of a coil

View answer and explanation

Correct Option: A

It applies a high dc voltage (500 V to 5 kV) and measures the very small leakage current.

Q120Electrical Engineering (SSC JE)

Hard

On a CRO, one cycle of a waveform spans 4 divisions with the time base set to 0.5 ms/div. The frequency is

A. 250 Hz

B. 2000 Hz

C. 50 Hz

D. 500 Hz

View answer and explanation

Correct Option: D

T = 4 × 0.5 = 2 ms, so f = 1/T = 500 Hz.

Q121Electrical Engineering (SSC JE)

Hard

A 0 to 100 V voltmeter has a guaranteed accuracy of ±1 percent of full scale. When it reads 50 V, the maximum possible error in the reading is

A. ±0.01 percent

B. ±2 percent

C. ±1 percent

D. ±0.5 percent

View answer and explanation

Correct Option: B

The limiting error is ±1 V, which is 1/50 = 2 percent of the reading. Readings should be taken near full scale.

Q122Electrical Engineering (SSC JE)

Easy

The secondary of a current transformer should never be

A. connected to an ammeter

B. earthed

C. open-circuited while the primary is carrying current

D. short-circuited

View answer and explanation

Correct Option: C

With the secondary open, the secondary ampere-turns that normally balance the primary vanish, so the core flux and the induced voltage rise dangerously.

Q123Electrical Engineering (SSC JE)

Easy

A closed-loop control system is one in which

A. there is no controller

B. the output has no effect on the control action

C. the output is fed back to influence the control action

D. the input is always zero

View answer and explanation

Correct Option: C

Feedback lets the system compare the output with the desired value and correct errors.

Q124Electrical Engineering (SSC JE)

Easy

The transfer function of a linear system is the ratio of

A. the input to the output in the time domain

B. the Laplace transform of the output to that of the input with zero initial conditions

C. the steady state output to the transient output

D. the Fourier transform of the input to the output

View answer and explanation

Correct Option: B

G(s) = C(s)/R(s), valid for linear time-invariant systems.

Q125Electrical Engineering (SSC JE)

Easy

The type of the system with open-loop transfer function G(s) = 10 / [s(s + 2)] is

A. 2

B. 0

C. 3

D. 1

View answer and explanation

Correct Option: D

The type is the number of poles at the origin, here one.

Q126Electrical Engineering (SSC JE)

Easy

A linear time-invariant system is stable if all the poles of its transfer function lie in

A. the right half of the s-plane

B. the origin

C. the left half of the s-plane

D. the imaginary axis only

View answer and explanation

Correct Option: C

Poles in the left half give decaying exponentials. A pole in the right half gives a growing response.

Q127Electrical Engineering (SSC JE)

Easy

A second order system with a damping ratio of 0.5 is

A. undamped

B. overdamped

C. critically damped

D. underdamped

View answer and explanation

Correct Option: D

For 0 < ζ < 1 the response oscillates with a decaying amplitude.

Q128Electrical Engineering (SSC JE)

Easy

The integral action in a PID controller mainly

A. eliminates the steady state error

B. increases the steady state error

C. reduces the noise

D. increases the speed of response only

View answer and explanation

Correct Option: A

The integral term keeps building up the control output as long as an error persists.

Q129Electrical Engineering (SSC JE)

Easy

The typical cut-in (forward) voltage of a silicon p-n junction diode is

A. 0.3 V

B. 5 V

C. 0.7 V

D. 1.5 V

View answer and explanation

Correct Option: C

Silicon starts conducting at about 0.6 to 0.7 V and germanium at about 0.2 to 0.3 V.

Q130Electrical Engineering (SSC JE)

Easy

A Zener diode is used as a voltage regulator when operated in

A. the forward region

B. the cut-off region

C. the reverse breakdown region

D. the saturation region

View answer and explanation

Correct Option: C

In breakdown the voltage across the Zener remains nearly constant over a wide range of current.

Q131Electrical Engineering (SSC JE)

Hard

A transistor has a common base current gain α = 0.98. Its common emitter current gain β is

A. 98

B. 4.9

C. 0.02

D. 49

View answer and explanation

Correct Option: D

β = α/(1 − α) = 0.98 / 0.02 = 49.

Q132Electrical Engineering (SSC JE)

Easy

A transistor is used as a switch by operating it between

A. the active region and saturation

B. the active region and cut-off

C. cut-off and saturation

D. breakdown and cut-off

View answer and explanation

Correct Option: C

In cut-off it is OFF (open) and in saturation it is ON (closed) with a small voltage drop.

Q133Electrical Engineering (SSC JE)

Easy

The binary equivalent of the decimal number 13 is

A. 1001

B. 1101

C. 1110

D. 1011

View answer and explanation

Correct Option: B

13 = 8 + 4 + 1 = 1101 in binary.

Q134Electrical Engineering (SSC JE)

Easy

The output of a NAND gate is LOW only when

A. all its inputs are LOW

B. any input is HIGH

C. all its inputs are HIGH

D. any input is LOW

View answer and explanation

Correct Option: C

NAND is the complement of AND, and AND is HIGH only when all inputs are HIGH.

Q135Electrical Engineering (SSC JE)

Easy

An inverting op-amp amplifier has Rf = 100 kΩ and Rin = 10 kΩ. The voltage gain is

A. 10

B. −11

C. −10

D. −0.1

View answer and explanation

Correct Option: C

Gain = −Rf/Rin = −100/10 = −10.

Q136Electrical Engineering (SSC JE)

Easy

A full-wave rectifier is fed from a 50 Hz supply. The ripple frequency at its output is

A. 100 Hz

B. 25 Hz

C. 50 Hz

D. 200 Hz

View answer and explanation

Correct Option: A

Both half cycles of the input produce output pulses, so the ripple frequency is twice the supply frequency.

Q137Electrical Engineering (SSC JE)

Easy

Once triggered, an SCR continues to conduct until

A. the gate is made negative

B. the anode current falls below the holding current

C. the anode voltage becomes positive

D. the gate current is removed

View answer and explanation

Correct Option: B

The gate loses control after turn-on. The device turns off only when the anode current drops below the holding current.

Q138Electrical Engineering (SSC JE)

Easy

In a single-phase half-wave uncontrolled rectifier with a resistive load, the average output voltage is

A. Vm / π

B. Vm / √2

C. 2Vm / π

D. Vm / 2

View answer and explanation

Correct Option: A

The average over a full cycle of a half-wave rectified sine is Vm/π. For a peak of 314 V this is about 100 V.

Q139Electrical Engineering (SSC JE)

Easy

A step-down chopper has an input of 200 V and a duty ratio of 0.4. The average output voltage is

A. 80 V

B. 500 V

C. 120 V

D. 200 V

View answer and explanation

Correct Option: A

Vo = D × Vin = 0.4 × 200 = 80 V.

Q140Electrical Engineering (SSC JE)

Easy

A cycloconverter converts

A. dc of one voltage into dc of another voltage

B. ac into dc

C. dc into ac

D. ac of one frequency into ac of another frequency directly

View answer and explanation

Correct Option: D

It changes the frequency without any intermediate dc link, and is used in large low-speed ac drives.

Q141Electrical Engineering (SSC JE)

Easy

A power MOSFET is

A. a latching device

B. a voltage controlled majority carrier device

C. a two-terminal device

D. a current controlled minority carrier device

View answer and explanation

Correct Option: B

The gate voltage controls the channel. It switches very fast, since there is no minority carrier storage.

Q142Electrical Engineering (SSC JE)

Easy

The Ward-Leonard system is used for

A. power factor improvement

B. measuring torque

C. starting an induction motor

D. smooth speed control of a dc motor over a wide range

View answer and explanation

Correct Option: D

A motor-generator set supplies a variable voltage to the armature of the dc motor, which is controlled through the generator field.

Q143Electrical Engineering (SSC JE)

Easy

A lamp emitting 3000 lumens falls uniformly on a surface of 10 m². The illumination is

A. 0.0033 lux

B. 30 lux

C. 300 lux

D. 3000 lux

View answer and explanation

Correct Option: C

Illumination = flux / area = 3000/10 = 300 lux.

Q144Electrical Engineering (SSC JE)

Easy

The illumination at a point on a surface from a point source varies

A. inversely as the square of the distance

B. directly as the square of the distance

C. directly as the distance

D. inversely as the distance

View answer and explanation

Correct Option: A

E = I cos θ / d² is the inverse square law.

Q145Electrical Engineering (SSC JE)

Easy

Induction heating works on the principle of

A. the passage of current through a resistive element

B. dielectric loss in an insulator

C. eddy currents induced in the workpiece

D. arcing between electrodes

View answer and explanation

Correct Option: C

An alternating magnetic field induces eddy currents in a conducting charge, which heat it.

Q146Electrical Engineering (SSC JE)

Easy

DC series motors are widely used in traction because they have

A. a constant speed

B. a high starting torque

C. a low starting current

D. a very high no-load speed

View answer and explanation

Correct Option: B

The torque varies with the square of the current, so the series motor gives a large torque at low speed.

Q147Electrical Engineering (SSC JE)

Easy

A signal has a maximum frequency component of 5 kHz. The minimum sampling frequency (Nyquist rate) is

A. 2.5 kHz

B. 10 kHz

C. 20 kHz

D. 5 kHz

View answer and explanation

Correct Option: B

The Nyquist rate is twice the highest frequency, 2 × 5 = 10 kHz.

Q148Electrical Engineering (SSC JE)

Easy

The Laplace transform of a unit step function is

A. 1

B. 1/s

C. 1/s²

D. s

View answer and explanation

Correct Option: B

L{u(t)} = ∫ e^(−st) dt from 0 to ∞ = 1/s.

Q149Electrical Engineering (SSC JE)

Easy

A system is linear if it satisfies the principle of

A. time invariance

B. superposition

C. causality

D. stability

View answer and explanation

Correct Option: B

The response to a sum of inputs is the sum of responses (additivity), and scaling the input scales the output (homogeneity).

Q150Electrical Engineering (SSC JE)

Hard

The period of the signal x(t) = sin(100πt) is

A. 0.02 s

B. 0.01 s

C. 2 s

D. 0.2 s

View answer and explanation

Correct Option: A

ω = 100π rad/s, so T = 2π/ω = 2π/(100π) = 0.02 s.

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