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English SSC CGL Tier I papers. Free 60-minute mocks, 100 questions, 200 marks; +2 correct and −0.5 incorrect. Source: SSC response sheets preserved by SSC Portal. The marked archived keys have not been independently revalidated against final SSC keys; worked explanations are pending review. A/B/C/D correspond to source options 1/2/3/4.

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Civil Engineering (SSC JE)

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Question 1 · Electrical Engineering (SSC JE) · Power Systems
For the same power transmitted at the same power factor, if the transmission voltage is doubled, the line loss becomes
Choose your answer for question 1
Answer and explanation

Correct answer: A

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

Question 2 · Electrical Engineering (SSC JE) · Power Systems
The skin effect in a conductor carrying alternating current increases with
Choose your answer for question 2
Answer and explanation

Correct answer: D

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

Question 3 · Electrical Engineering (SSC JE) · Power Systems
Corona on an overhead line starts when the potential gradient at the conductor surface exceeds about
Choose your answer for question 3
Answer and explanation

Correct answer: 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.

Question 4 · Electrical Engineering (SSC JE) · Power Systems
The string efficiency of a string of suspension insulators is always
Choose your answer for question 4
Answer and explanation

Correct answer: 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.

Question 5 · Electrical Engineering (SSC JE) · Power Systems
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
Choose your answer for question 5
Answer and explanation

Correct answer: B

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

Question 6 · Electrical Engineering (SSC JE) · Power Systems
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
Choose your answer for question 6
Answer and explanation

Correct answer: A

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

Question 7 · Electrical Engineering (SSC JE) · Power Systems
SF6 gas is used in high voltage circuit breakers because it has
Choose your answer for question 7
Answer and explanation

Correct answer: A

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

Question 8 · Electrical Engineering (SSC JE) · Power Systems
The Buchholz relay is used for the protection of
Choose your answer for question 8
Answer and explanation

Correct answer: D

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

Question 9 · Electrical Engineering (SSC JE) · Power Systems
A lightning arrester is connected
Choose your answer for question 9
Answer and explanation

Correct answer: B

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

Question 10 · Electrical Engineering (SSC JE) · Power Systems
The power factor of an inductive load is improved by connecting
Choose your answer for question 10
Answer and explanation

Correct answer: B

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

Question 11 · Electrical Engineering (SSC JE) · Power Systems
Compared with a radial distribution system, a ring main system
Choose your answer for question 11
Answer and explanation

Correct answer: C

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

Question 12 · Electrical Engineering (SSC JE) · Power Systems
A consumer has a maximum demand of 100 kW and uses 1800 kWh in a day. The daily load factor is
Choose your answer for question 12
Answer and explanation

Correct answer: D

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

Question 13 · Electrical Engineering (SSC JE) · Power Systems
The diversity factor of a group of consumers is always
Choose your answer for question 13
Answer and explanation

Correct answer: 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.

Question 14 · Electrical Engineering (SSC JE) · Power Systems
A pumped storage hydro plant is mainly used to meet
Choose your answer for question 14
Answer and explanation

Correct answer: B

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

Question 15 · Electrical Engineering (SSC JE) · Power Systems
The ABCD constants of a short transmission line with series impedance Z are
Choose your answer for question 15
Answer and explanation

Correct answer: B

With negligible shunt admittance, Vs = Vr + Z Ir and Is = Ir.

Question 16 · Electrical Engineering (SSC JE) · Power Systems
The Ferranti effect refers to
Choose your answer for question 16
Answer and explanation

Correct answer: A

The charging current of the line capacitance flows through the line inductance and raises the voltage at the open end.

Question 17 · Electrical Engineering (SSC JE) · Power Systems
A line has an inductance of 1.2 mH/km and a capacitance of 0.012 μF/km. The surge impedance is about
Choose your answer for question 17
Answer and explanation

Correct answer: B

Zc = √(L/C) = √(1.2 × 10⁻³ / 1.2 × 10⁻⁸) = √10⁵ = 316 Ω.

Question 18 · Electrical Engineering (SSC JE) · Power Systems
A bus has a Thevenin reactance of 0.2 pu on a 100 MVA base. The short-circuit level at that bus is
Choose your answer for question 18
Answer and explanation

Correct answer: A

Short-circuit MVA = base MVA / X pu = 100/0.2 = 500 MVA.

Question 19 · Electrical Engineering (SSC JE) · Power Systems
In a balanced three-phase short circuit, the fault current is determined by
Choose your answer for question 19
Answer and explanation

Correct answer: B

A symmetrical fault has no negative or zero sequence components.

Question 20 · Electrical Engineering (SSC JE) · Power Systems
The making current of a circuit breaker is related to its symmetrical breaking current by
Choose your answer for question 20
Answer and explanation

Correct answer: D

The peak of the first cycle of the asymmetrical fault current is about 2.55 times the rms symmetrical value, and the breaker must close on it without damage.

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