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SSC JE ELECTRICAL
ssc MCQs with answers - Part 3
1. What will be the produced mml (in Amp-turns) in a coil, if the coil has 160 turns and carries a current of 0.15 A ? 32 24 16 8 Answer: 24 Explanation: 24 will be the produced mml (in Amp-turns) in a coil, if the coil has 160 turns and carries a current of 0.15 A 2. Determine the reluctance (in Amp-turns/Wb) of a coil, when the flux through the coil is 25 Wb and the value of produced mml is 50 Amp-turns ? 2 6 8 5 Answer: 2 Explanation: The reluctance is 2 (in Amp-turns/Wb) of a coil, when the flux through the coil is 25 Wb and the value of produced mml is 50 Amp-turns. 3. Determine the magnetic field intensity (in Amp-turns/m) of 5 metre long coil when the coil has 100 turns and carries a current of 0.6 A ? 15 12 10 8 Answer: 12 Explanation: The magnetic field intensity is 12 (in Amp-turns/m) of 5 metre long coil when the coil has 100 turns and carries a current of 0.6 A. 4. Determine the self-inductance (in mH) of a 3 m long air-cored solenoid, when the coil has 300 turns and the diameter of the coil 12 cm ? 0.41 0.35 0.32 0.24 Answer: 0.41 Explanation: the self-inductance 0.41 (in mH) of a 3 m long air-cored solenoid, when the coil has 300 turns and the diameter of the coil 12 cm 5. Determine the current (in A) through a 60 cm long solenoid when the solenoid has 400 turns and the value of magnetic field at the centre of the solenoid is 6 mT ? 4.41 5.6 7.2 8.4 Answer: 7.2 Explanation: The current 7.2 (in A) through a 60 cm long solenoid when the solenoid has 400 turns and the value of magnetic field at the centre of the solenoid is 6 mT 6. Determine the time-period (in ms) of a sinusoidal wave when the frequency of the wave is 60 Hz. ? 16.67 18.26 20.24 26 Answer: 16.67 Explanation: 16.67 time-period (in ms) of a sinusoidal wave when the frequency of the wave is 60 Hz. 7. Which of the following is the unit of frequency of an AC signal ? Hertz/Second Revolution Hertz Revolution/second Answer: Hertz Explanation: Hertz is the unit of frequency of an AC signal. 8. Determine the average value of alternating voltage (in V} when the peak value of the voltage is 120 V. ? 76.44 86.34 110.34 188.38 Answer: 76.44 Explanation: The average value of alternating voltage is 76.44 (in V} when the peak value of the voltage is 120 V. 9. What will be the capacitance (in mF) of a circuit when the circuit is supplied with a 50 Hz frequency and the capacitive reactance of the circuit is 40 ohms ? 0.4 0.8 1.4 2.6 Answer: 0.8 Explanation: 0.8 will be the capacitance (in mF) of a circuit when the circuit is supplied with a 50 Hz frequency and the capacitive reactance of the circuit is 40 ohms. 10. Determine the total power (in kW) consumed by a 3-phase delta connected system supplied by a line voltage of 240 V when the value of phase current is 20 A and the current lags the voltage by 60 degree ? 9.4 8.6 8.2 7.2 Answer: 7.2 Explanation: the total power 7.2 (in kW) consumed by a 3-phase delta connected system supplied by a line voltage of 240 V when the value of phase current is 20 A and the current lags the voltage by 60 degree | ||
