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. |
Choose the correct in the case of V/F control. |
| A. | Ns-Nr=constant |
| B. | Ns*Nr=constant |
| C. | Ns%Nr=constant |
| D. | Ns+Nr=constant |
| Answer» B. Ns*Nr=constant | |
| 2. |
Calculate the value of the time period if the frequency of the signal is .48 sec. |
| A. | 2 Hz |
| B. | 3 Hz |
| C. | 7 Hz |
| D. | 9 Hz |
| Answer» B. 3 Hz | |
| 3. |
Calculate the active power in a 1.7 Ω resistor with 1.8 A current flowing through it. |
| A. | 5.5 W |
| B. | 5.1 W |
| C. | 5.4 W |
| D. | 5.7 W |
| Answer» B. 5.1 W | |
| 4. |
Calculate the active power in .an 18.064 H inductor. |
| A. | 4.48 W |
| B. | 17.89 W |
| C. | 0 W |
| D. | 25.45 W |
| Answer» D. 25.45 W | |
| 5. |
Calculate the active power in a 56 F capacitor. |
| A. | 6.45 W |
| B. | 0 W |
| C. | 15.45 W |
| D. | 14.23 W |
| Answer» C. 15.45 W | |
| 6. |
Calculate the active power in a 7481 H inductor. |
| A. | 1562 W |
| B. | 4651 W |
| C. | 0 W |
| D. | 4654 W |
| Answer» D. 4654 W | |
| 7. |
The slope of the V-I curve is 86.5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | 16.34 Ω |
| B. | 15.88 Ω |
| C. | 48.43 Ω |
| D. | 54.57 Ω |
| Answer» B. 15.88 Ω | |
| 8. |
Calculate the useful power developed by a motor using the given data: Pin = 10 W, Ia = .6 A, Ra=.2 Ω. Assume frictional losses are 2 W and windage losses are 3 W. |
| A. | 4.928 W |
| B. | 1.955 W |
| C. | 1.485 W |
| D. | 1.488 W |
| Answer» B. 1.955 W | |
| 9. |
Calculate the time period of the waveform y(t)=87cos(πt+289π÷4). |
| A. | 2 sec |
| B. | 37 sec |
| C. | 3 sec |
| D. | 1 sec |
| Answer» B. 37 sec | |
| 10. |
Calculate the moment of inertia of the thin spherical shell having a mass of 7.8 kg and diameter of 145.6 cm. |
| A. | 2.72 kgm2 |
| B. | 5.96 kgm2 |
| C. | 5.45 kgm2 |
| D. | 2.78 kgm2 |
| Answer» B. 5.96 kgm2 | |
| 11. |
Calculate the moment of inertia of the tennis ball having a mass of 7 kg and diameter of 152 cm. |
| A. | 3.55 kgm2 |
| B. | 4.47 kgm2 |
| C. | 2.66 kgm2 |
| D. | 1.41 kgm2 |
| Answer» D. 1.41 kgm2 | |
| 12. |
Calculate the value of the angular acceleration of the motor using the given data: J = .1 kg-m2, load torque = 45 N-m, motor torque = 55 N-m. |
| A. | 100 rad/s2 |
| B. | 222 rad/s2 |
| C. | 300 rad/s2 |
| D. | 400 rad/s2 |
| Answer» D. 400 rad/s2 | |
| 13. |
Calculate the active power developed by a motor using the given data: Eb = 5.5 V and I = .5 A. |
| A. | 2.75 W |
| B. | 2.20 W |
| C. | 5.30 W |
| D. | 5.50 W |
| Answer» B. 2.20 W | |
| 14. |
40 V, 7 A, 70 rpm DC separately excited motor having a resistance of 0.3 ohms excited by an external dc voltage source of 4 V. Calculate the torque developed by the motor on half load. |
| A. | 18.10 N-m |
| B. | 4.24 N-m |
| C. | 40.45 N-m |
| D. | 52.64 N-m |
| Answer» B. 4.24 N-m | |