MCQOPTIONS
Saved Bookmarks
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 26.3 sec and off for 24.2 sec. |
| A. | 1.086 |
| B. | 1.042 |
| C. | 1.214 |
| D. | 1.876 |
| Answer» B. 1.042 | |
| 2. |
Calculate the total heat dissipated in a resistor of 50 when 1.4 A current flows through it. |
| A. | 98 W |
| B. | 92 W |
| C. | 91 W |
| D. | 93 W |
| Answer» B. 92 W | |
| 3. |
Calculate the time period of the waveform z(t)=24sin( t+ 4)+4sin(2 t+ 6). |
| A. | 2 sec |
| B. | 3 sec |
| C. | 4 sec |
| D. | 1 sec |
| Answer» B. 3 sec | |
| 4. |
Calculate the active power in a .154 H inductor. |
| A. | 22 W |
| B. | 14 W |
| C. | 45 W |
| D. | 0 W |
| Answer» E. | |
| 5. |
If induction motor air gap power is 48 KW and gross developed power is 28 KW, then rotor ohmic loss will be _________ KW. |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» C. 30 | |
| 6. |
The slope of the V-I curve is 39.1 . Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .81 |
| B. | .36 |
| C. | .75 |
| D. | .84 |
| Answer» B. .36 | |
| 7. |
A 3-phase induction machine draws active power P and reactive power Q from the grid. If it is operated as a generator, then P and Q will be _________ |
| A. | Positive and Negative |
| B. | Negative and Positive |
| C. | Positive and Positive |
| D. | Negative and Negative |
| Answer» C. Positive and Positive | |
| 8. |
If induction motor air gap power is 10 KW and mechanically developed power is 8 KW, then rotor ohmic loss will be _________ KW. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 9. |
The short circuit test on a 3- induction motor is conducted at a rotor speed of _______ |
| A. | Zero |
| B. | < N<sub>s</sub> |
| C. | > N<sub>s</sub> |
| D. | N<sub>s</sub> |
| Answer» B. < N<sub>s</sub> | |
| 10. |
R.M.S value of the sinusoidal waveform V=48sin(6.5 t+89 46.8). |
| A. | 33.94 V |
| B. | 33.56 V |
| C. | 33.12 V |
| D. | 33.78 V |
| Answer» B. 33.56 V | |
| 11. |
Calculate the amplitude of the sinusoidal waveform z(t)=715sin(165 t+2 468). |
| A. | 710 |
| B. | 715 |
| C. | 716 |
| D. | 718 |
| Answer» C. 716 | |
| 12. |
A 16-pole, 3-phase, 60 Hz induction motor is operating at a speed of 150 rpm. The frequency of the rotor current of the motor in Hz is __________ |
| A. | 20 |
| B. | 40 |
| C. | 30 |
| D. | 10 |
| Answer» C. 30 | |
| 13. |
The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______ |
| A. | Efficiency is higher |
| B. | Power factor is higher |
| C. | Slip is larger |
| D. | Starting current is lower |
| Answer» E. | |