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 a .56 F capacitor. |
| A. | 37.8 W |
| B. | 0 W |
| C. | 15.4 W |
| D. | 124.5 W |
| Answer» C. 15.4 W | |
| 2. |
The unit of angular frequency is Hz. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Calculate the active power in a .8 resistor with 2 A current flowing through it. |
| A. | 2.4 W |
| B. | 3.4 W |
| C. | 2.2 W |
| D. | 3.2 W |
| Answer» E. | |
| 4. |
Calculate the active power in a .7889 H inductor. |
| A. | .123 W |
| B. | .155 W |
| C. | 0 W |
| D. | .487 W |
| Answer» D. .487 W | |
| 5. |
A 3-phase induction motor runs at almost 140 rpm at no load and 50 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. | 20 revolution per minute |
| B. | 80 revolution per minute |
| C. | 90 revolution per minute |
| D. | 70 revolution per minute |
| Answer» D. 70 revolution per minute | |
| 6. |
Calculate the value of the torque when 1 N force is applied perpendicular to a 1 m length of chain fixed at the center. |
| A. | 1 N-m |
| B. | 3 N-m |
| C. | 2 N-m |
| D. | 4 N-m |
| Answer» B. 3 N-m | |
| 7. |
The slope of the V-I curve is 16.8 . Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .324 |
| B. | .301 |
| C. | .343 |
| D. | .398 |
| Answer» C. .343 | |
| 8. |
100 V, 2 A, 90 rpm separately excited dc motor with armature resistance (Ra) equal to 8 ohms. Calculate back emf developed in the motor when it operates on 3th/4 of the full load. (Assume rotational losses are neglected) |
| A. | 100 V |
| B. | 87 V |
| C. | 88 V |
| D. | 90 V |
| Answer» D. 90 V | |
| 9. |
Calculate the value of the torque when 89 N force is applied perpendicular to a 78 m length of stick fixed at the center. |
| A. | 6942 N-m |
| B. | 3000 N-m |
| C. | 1000 N-m |
| D. | 4470 N-m |
| Answer» B. 3000 N-m | |
| 10. |
Calculate the moment of inertia of the thin spherical shell having a mass of 703 kg and diameter of 376 cm. |
| A. | 1639.89 kgm<sup>2</sup> |
| B. | 1628.47 kgm<sup>2</sup> |
| C. | 1678.12 kgm<sup>2</sup> |
| D. | 1978.19 kgm<sup>2</sup> |
| Answer» B. 1628.47 kgm<sup>2</sup> | |
| 11. |
Calculate the moment of inertia of the disc having a mass of 4 kg and diameter of 1458 cm. |
| A. | 106.288 kgm<sup>2</sup> |
| B. | 104.589 kgm<sup>2</sup> |
| C. | 105.487 kgm<sup>2</sup> |
| D. | 107.018 kgm<sup>2</sup> |
| Answer» B. 104.589 kgm<sup>2</sup> | |
| 12. |
Calculate the phase angle of the sinusoidal waveform z(t)=.99sin(4578 t+78 78). |
| A. | 3 |
| B. | 2 |
| C. | 7 |
| D. | |
| Answer» E. | |
| 13. |
A 10-pole, 3-phase, 60 Hz induction motor is operating at a speed of 100 rpm. The frequency of the rotor current of the motor in Hz is __________ |
| A. | 52.4 |
| B. | 54.8 |
| C. | 51.66 |
| D. | 51.77 |
| Answer» D. 51.77 | |
| 14. |
Calculate the active power in a .45 H inductor. |
| A. | 0.11 W |
| B. | 0.14 W |
| C. | 0.15 W |
| D. | 0 W |
| Answer» E. | |