MCQOPTIONS
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MCQOPTIONS
This section includes 13 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 mark to space ratio if the system is on for 4.3 sec and off for 78.2 sec. |
| A. | .054 |
| B. | .047 |
| C. | .039 |
| D. | .018 |
| Answer» B. .047 | |
| 2. |
Calculate the total heat dissipated in a rotor resistor of 14.23 when .65 A current flows through it. |
| A. | 6.45 W |
| B. | 6.01 W |
| C. | 6.78 W |
| D. | 6.98 W |
| Answer» C. 6.78 W | |
| 3. |
Calculate the time period of the waveform i(t)=sin( t+6 4)+sin( t+5 6). |
| A. | 2 sec |
| B. | 4 sec |
| C. | 5 sec |
| D. | 3 sec |
| Answer» B. 4 sec | |
| 4. |
Calculate the active power in a .89 H inductor. |
| A. | 1.535 W |
| B. | 0 W |
| C. | 2.484 W |
| D. | 1.598 W |
| Answer» C. 2.484 W | |
| 5. |
The power factor of a squirrel cage induction motor generally is ___________ |
| A. | .6-.8 |
| B. | .1-.2 |
| C. | .2-.4 |
| D. | .5-.7 |
| Answer» B. .1-.2 | |
| 6. |
The slope of the V-I curve is 1.1 . Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .019 |
| B. | .036 |
| C. | .075 |
| D. | .084 |
| Answer» B. .036 | |
| 7. |
Calculate the line voltage in star connection when phase voltage=45 V. |
| A. | 77.9 V |
| B. | 77.6 V |
| C. | 77.2 V |
| D. | 77.8 V |
| Answer» B. 77.6 V | |
| 8. |
If induction motor air gap power is 67 KW and mechanically developed power is 26 KW, then rotor ohmic loss will be _________ KW. |
| A. | 41 |
| B. | 42 |
| C. | 43 |
| D. | 44 |
| Answer» B. 42 | |
| 9. |
The no-load circuit test on a 3- induction motor is conducted at a rotor speed of _______ |
| A. | Zero |
| B. | < Ns |
| C. | > Ns |
| D. | Ns |
| Answer» E. | |
| 10. |
R.M.S value of the sinusoidal waveform q(t)=2.11cos(87.25t+78 478.23). |
| A. | 1.49 V |
| B. | 1.56 V |
| C. | 1.12 V |
| D. | 1.78 V |
| Answer» B. 1.56 V | |
| 11. |
Calculate the amplitude of the sinusoidal waveform z(t)=.27sin(.369 t+.142 4.25). |
| A. | .287 |
| B. | .270 |
| C. | .216 |
| D. | .287 |
| Answer» C. .216 | |
| 12. |
A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20. |
| A. | 418.56 |
| B. | 420.12 |
| C. | 421.23 |
| D. | 422.45 |
| Answer» C. 421.23 | |
| 13. |
A 32-pole, 3-phase, 70 Hz induction motor is operating at a speed of 112 rpm. The frequency of the rotor current of the motor in Hz is __________ |
| A. | 40.2 |
| B. | 46.1 |
| C. | 40.1 |
| D. | 40.6 |
| Answer» D. 40.6 | |