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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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Question 1 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A permanent magnet moving coil (PMMC) instrument can be used on
Choose your answer for question 1
Answer and explanation

Correct answer: C

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

Question 2 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A dynamometer type wattmeter can be used to measure power in
Choose your answer for question 2
Answer and explanation

Correct answer: 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.

Question 3 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
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
Choose your answer for question 3
Answer and explanation

Correct answer: A

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

Question 4 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
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
Choose your answer for question 4
Answer and explanation

Correct answer: C

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

Question 5 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
Creeping in an energy meter is
Choose your answer for question 5
Answer and explanation

Correct answer: D

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

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

Correct answer: A

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

Question 7 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A megger is used to measure
Choose your answer for question 7
Answer and explanation

Correct answer: A

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

Question 8 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
On a CRO, one cycle of a waveform spans 4 divisions with the time base set to 0.5 ms/div. The frequency is
Choose your answer for question 8
Answer and explanation

Correct answer: D

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

Question 9 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
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
Choose your answer for question 9
Answer and explanation

Correct answer: B

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

Question 10 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
The secondary of a current transformer should never be
Choose your answer for question 10
Answer and explanation

Correct answer: 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.

Question 11 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
The scale of a moving iron instrument is
Choose your answer for question 11
Answer and explanation

Correct answer: D

The deflection torque varies with the square of the current, so the scale is crowded at the low end.

Question 12 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
An energy meter has a constant of 600 rev/kWh. The disc makes 60 revolutions in 5 minutes. The load is
Choose your answer for question 12
Answer and explanation

Correct answer: D

60 rev = 0.1 kWh in 5 min = 1/12 h. Power = 0.1 × 12 = 1.2 kW.

Question 13 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A dc potentiometer is standardised using
Choose your answer for question 13
Answer and explanation

Correct answer: A

The working current is adjusted so the voltage drop along the wire matches the known emf of the standard cell, giving a known potential gradient.

Question 14 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
An LVDT is used to measure
Choose your answer for question 14
Answer and explanation

Correct answer: C

A linear variable differential transformer converts the position of a core into an ac voltage proportional to the displacement.

Question 15 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A thermocouple works on the principle of the
Choose your answer for question 15
Answer and explanation

Correct answer: B

A temperature difference between two junctions of dissimilar metals produces an emf (the Seebeck effect).

Question 16 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A current transformer of ratio 200/5 is connected to an ammeter which reads 4 A. The primary current is
Choose your answer for question 16
Answer and explanation

Correct answer: C

The ratio is 40, so I1 = 4 × 40 = 160 A.

Question 17 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A 3½ digit digital voltmeter can display a maximum reading of
Choose your answer for question 17
Answer and explanation

Correct answer: A

The half digit can only be 0 or 1, so the display runs from −1999 to +1999.

Question 18 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
On the 2 V range, a 3½ digit digital voltmeter has a resolution of
Choose your answer for question 18
Answer and explanation

Correct answer: B

The full-scale display is 1.999 V with three decimals, so the smallest step is 0.001 V.

Question 19 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
An error due to wrong calibration of an instrument is a
Choose your answer for question 19
Answer and explanation

Correct answer: C

It is repeatable and consistent in direction, and can be corrected by recalibration.

Question 20 · Electrical Engineering (SSC JE) · Electrical Measurements and Instruments
A wattmeter has ratings of 150 V, 5 A and a full scale of 150 divisions. The wattmeter constant is
Choose your answer for question 20
Answer and explanation

Correct answer: D

Full-scale power = 150 × 5 = 750 W. Constant = 750/150 = 5 W per division.

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