MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the active power in an 8.12 F capacitor. |
| A. | 89 W |
| B. | 41 W |
| C. | 0 W |
| D. | 48 W |
| Answer» D. 48 W | |
| 2. |
Calculate the total heat dissipated in a rotor resistor of 21 Ω when .81 A current flows through it. |
| A. | 13.77 W |
| B. | 12.56 |
| C. | 16.78 W |
| D. | 13.98 W |
| Answer» B. 12.56 | |
| 3. |
Calculate the maximum value of slip when rotor resistance is 2 Ω and rotor reactance is 3 Ω. |
| A. | 0.66 |
| B. | 0.33 |
| C. | 0.44 |
| D. | 0.99 |
| Answer» B. 0.33 | |
| 4. |
Calculate the active power in a 168.12 H inductor. |
| A. | 65 W |
| B. | 0 W |
| C. | 68 W |
| D. | 64 W |
| Answer» C. 68 W | |
| 5. |
Calculate the line current in the delta connection when phase current=17 A. |
| A. | 29.44 A |
| B. | 24.64 A |
| C. | 23.48 A |
| D. | 26.56 A |
| Answer» B. 24.64 A | |
| 6. |
If induction motor rotor power is 157.5 KW and gross developed power is 79.9 KW, then rotor ohmic loss will be _________ KW. |
| A. | 77.5 |
| B. | 77.6 |
| C. | 76.9 |
| D. | 77.1 |
| Answer» C. 76.9 | |
| 7. |
The slope of the V-I curve is 35.48°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | 0.452 Ω |
| B. | 0.462 Ω |
| C. | 0.752 Ω |
| D. | 0.712 Ω |
| Answer» E. | |
| 8. |
Calculate the line voltage in the delta connection when phase voltage=45 V. |
| A. | 46 V |
| B. | 47 V |
| C. | 45 V |
| D. | 78 V |
| Answer» D. 78 V | |
| 9. |
If induction motor air gap power is 2 KW and mechanically developed power is 1 KW, then rotor ohmic loss will be _________ KW. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 10. |
Calculate the peak value of sinusoidal waveform if the r.m.s value is 21 V. |
| A. | 29.69 V |
| B. | 48.74 V |
| C. | 69.23 V |
| D. | 25.74 V |
| Answer» B. 48.74 V | |
| 11. |
R.M.S value of the sinusoidal waveform v(t)=211sin(7.25t+7π÷78.3). |
| A. | 149.19 V |
| B. | 156.23 V |
| C. | 116.57 V |
| D. | 178.64 V |
| Answer» B. 156.23 V | |
| 12. |
Zero voltage regulation can be only achieved in leading power factor load. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Calculate the condition for maximum voltage regulation in the synchronous machine. |
| A. | Φ=ϴs |
| B. | Φ=2ϴs |
| C. | Φ=4ϴs |
| D. | Φ=8ϴs |
| Answer» B. Φ=2ϴs | |
| 14. |
Calculate the voltage regulation in the synchronous machine if the no-load voltage is 12 V and the full load voltage is 15V. |
| A. | -20% |
| B. | -40% |
| C. | -60% |
| D. | -80% |
| Answer» B. -40% | |