MCQOPTIONS
Saved Bookmarks
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 velocity of the disc if the angular speed is 5 rad/s and radius is 2 m. |
| A. | 25 m/s |
| B. | 20 m/s |
| C. | 25 m/s |
| D. | 10 m/s |
| Answer» E. | |
| 2. |
Calculate the value of the frequency if the signal completes half of the cycle in 30 sec. Assume signal is periodic. |
| A. | 0.028 Hz |
| B. | 0.016 Hz |
| C. | 0.054 Hz |
| D. | 0.045 Hz |
| Answer» C. 0.054 Hz | |
| 3. |
Calculate the value of the duty cycle if the system is on for 48 sec and off for 1 sec. |
| A. | .979 |
| B. | .444 |
| C. | .145 |
| D. | .578 |
| Answer» B. .444 | |
| 4. |
Calculate the value of the frequency of the 220 V DC supply. |
| A. | 10 Hz |
| B. | 0 Hz |
| C. | 20 Hz |
| D. | 90 Hz |
| Answer» C. 20 Hz | |
| 5. |
A 3-phase induction motor runs at almost 50 rpm at no load and 25 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor? |
| A. | 25 revolution per minute |
| B. | 20 revolution per minute |
| C. | 10 revolution per minute |
| D. | 30 revolution per minute |
| Answer» B. 20 revolution per minute | |
| 6. |
Calculate the reactive power in a 23 resistor. |
| A. | 45 VAR |
| B. | 10 VAR |
| C. | 245 VAR |
| D. | 0 VAR |
| Answer» E. | |
| 7. |
The slope of the V-I curve is 23.56 . Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .464 |
| B. | .436 |
| C. | .443 |
| D. | .463 |
| Answer» C. .443 | |
| 8. |
The slope of the V-I curve is 270 . Calculate the value of resistance. |
| A. | 112 |
| B. | 178 |
| C. | infinite |
| D. | 187 |
| Answer» D. 187 | |
| 9. |
Calculate the value of the time period if the frequency of the signal is 1 sec. |
| A. | 1 sec |
| B. | 2 sec |
| C. | .5 sec |
| D. | 1.5 sec |
| Answer» B. 2 sec | |
| 10. |
Calculate the moment of inertia of the thin spherical shell having a mass of 3 kg and diameter of 66 cm. |
| A. | .2156 kgm<sup>2</sup> |
| B. | .2147 kgm<sup>2</sup> |
| C. | .2138 kgm<sup>2</sup> |
| D. | .2148 kgm<sup>2</sup> |
| Answer» B. .2147 kgm<sup>2</sup> | |
| 11. |
Calculate the mass of the solid sphere having a moment of inertia 17 kgm2 and radius of 4 cm. |
| A. | 10624 kg |
| B. | 10625 kg |
| C. | 10628 kg |
| D. | 10626 kg |
| Answer» C. 10628 kg | |
| 12. |
Calculate the phase angle of the sinusoidal waveform z(t)=18cos(1546 t+1900 76). |
| A. | 25 39 |
| B. | 25 5 |
| C. | 25 1 |
| D. | 4 |
| Answer» D. 4 | |
| 13. |
A 14-pole, 3-phase, 50 Hz induction motor is operating at a speed of 99 rpm. The frequency of the rotor current of the motor in Hz is __________ |
| A. | 39.5 |
| B. | 40 |
| C. | 38.45 |
| D. | 39.9 |
| Answer» D. 39.9 | |
| 14. |
Calculate the value of the angular acceleration of the motor using the given data: J = .01 kg-m2, load torque= 790 N-m, motor torque= 169 N-m. |
| A. | -62100 rad/s<sup>2</sup> |
| B. | -62456 rad/s<sup>2</sup> |
| C. | -34056 rad/s<sup>2</sup> |
| D. | -44780 rad/s<sup>2</sup> |
| Answer» B. -62456 rad/s<sup>2</sup> | |