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SSC JE ELECTRICAL
ssc MCQs with answers - Part 9
1. Determine the quality factor of a series RLC circuit, when the value of capacitance is 0.02 mF, the value of inductance is 8 mH and the value of resistance is 40 ohms. ?
0.5
0.4
0.8
1.3
Answer: 0.5
2. What will be the time (in seconds) taken by the inductor reach its maximum steady state value in a series RL circuit, when the value of the inductance is 0.8 H and the value of the resistance is 10 Ohms ?
0.2
0.6
0.4
0.8
Answer: 0.4
3. Which one of the following is the dimension of energy ?
ML²/T³
ML²/T²
T²/ML²
ML²/QT²
Answer: ML²/T²
4. Which one of the following statement is NOT TRUE about the MI type instruments ?
MI type Instruments are suitable for both AC and DC circuits.
Frictional error in MI type instruments is very less.
The torque weight ratio of MI type instruments is high.
The instrument cost is much higher as compared to PMMC type instruments.
Answer: The instrument cost is much higher as compared to PMMC type instruments.
5. Which one of the following statement is NOT TRUE about multimeter ?
Multimeter can be used for the measurement of voltage.
Multimeter can be used for the measurement of power.
Multimeter can be used for the measurement of resistance.
Multimeter can be used for the measurement of current.
Answer: Multimeter can be used for the measurement of power.
6. Which one of the following is the main cause of magnetic decay in PMMC type instrument ?
Variation in the resistance of the moving coil
Quality of spring
Aging of the spring
Aging of the magnets
Answer: Aging of the magnets
7. Determine the apparent power (in W) of a circuit, if the circuit have a power factor of 0.8 and the reactive power of the circuit is 60 W ?
80
75
60
55
Answer: 75
8. A building has 3 floors and each floor has 4 fans of 50 W that operates for 12 hours a day and one air conditioner of 3000 W that operates for 2 hours per day in the month of the June. Determine the energy consumption (in kWh) of the building in June ?
512
252
756
504
Answer: 756
9. Determine the reading (in kW) of both the watt-meter used to measure the power of a three-phase three-wire system having input of 6 kW and power factor of 1 ?
4, 2
5, 1
3, 3
6, 0
Answer: 3, 3
10. Determine the full-scale reading (in V) of a PMMC type voltmeter, when the internal resistance of the voltmeter is 230 kilo-ohms, the series resistance connected with the voltmeter is 70 kilo-ohms and the sensitivity of the voltmeter is 3 kilo-ohms/volt ?
200
150
100
250
Answer: 100
