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 mark to space ratio if the system is on for 9 sec and time period is 11 sec. |
| A. | 4.6 |
| B. | 4.8 |
| C. | 4.5 |
| D. | 4.9 |
| Answer» D. 4.9 | |
| 2. |
Calculate the total heat dissipated in a resistor of 12 when 9.2 A current flows through it. |
| A. | 2.01 KW |
| B. | 3.44 KW |
| C. | 1.01 KW |
| D. | 2.48 KW |
| Answer» D. 2.48 KW | |
| 3. |
Calculate the active power in a 1.2 resistor with 1.8 A current flowing through it. |
| A. | 3.88 W |
| B. | 3.44 W |
| C. | 3.12 W |
| D. | 2.18 W |
| Answer» B. 3.44 W | |
| 4. |
Calculate the active power in a 157.1545 H inductor. |
| A. | 4577 W |
| B. | 4567 W |
| C. | 4897 W |
| D. | 0 W |
| Answer» E. | |
| 5. |
A 3-phase induction motor runs at almost 888 rpm at no load and 500 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. | 388 revolution per minute |
| B. | 400 revolution per minute |
| C. | 644 revolution per minute |
| D. | 534 revolution per minute |
| Answer» B. 400 revolution per minute | |
| 6. |
The generated e.m.f from 2-pole armature having 2 conductors driven at 3000 rpm having flux per pole as 4000 mWb, with 91 parallel paths is ___________ |
| A. | 8.64 V |
| B. | 8.56 V |
| C. | 8.12 V |
| D. | 8.79 V |
| Answer» E. | |
| 7. |
The slope of the V-I curve is 15.5 . Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .277 |
| B. | .488 |
| C. | .443 |
| D. | .457 |
| Answer» B. .488 | |
| 8. |
Calculate the useful power developed by a motor using the given data: Pin= 1500 W, Ia= 6 A, Ra=.2 . Assume frictional losses are 50 W and windage losses are 25 W. |
| A. | 1400 W |
| B. | 1660.5 W |
| C. | 1417.8 W |
| D. | 1416.7 W |
| Answer» D. 1416.7 W | |
| 9. |
Calculate the time period of the waveform y(t)=7cos(54 t+2 4). |
| A. | .055 sec |
| B. | .037 sec |
| C. | .023 sec |
| D. | .017 sec |
| Answer» C. .023 sec | |
| 10. |
Calculate the moment of inertia of the thin spherical shell having a mass of 3.3 kg and diameter of .6 cm. |
| A. | .00125 kgm<sup>2</sup> |
| B. | .00196 kgm<sup>2</sup> |
| C. | .00145 kgm<sup>2</sup> |
| D. | .00178 kgm<sup>2</sup> |
| Answer» C. .00145 kgm<sup>2</sup> | |
| 11. |
Calculate the moment of inertia of the apple having a mass of .4 kg and diameter of 12 cm. |
| A. | .0008 kgm<sup>2</sup> |
| B. | .0007 kgm<sup>2</sup> |
| C. | .0009 kgm<sup>2</sup> |
| D. | .0001 kgm<sup>2</sup> |
| Answer» C. .0009 kgm<sup>2</sup> | |
| 12. |
Calculate the value of the angular acceleration of the motor using the given data: J = 36 kg-m2, load torque = 66 N-m, motor torque = 26 N-m. |
| A. | 1.11 rad/s<sup>2</sup> |
| B. | 2.22 rad/s<sup>2</sup> |
| C. | 3.33 rad/s<sup>2</sup> |
| D. | 4.44 rad/s<sup>2</sup> |
| Answer» B. 2.22 rad/s<sup>2</sup> | |
| 13. |
Calculate the power developed by a motor using the given data: Eb = 55 V and I = 6 A. |
| A. | 440 W |
| B. | 220 W |
| C. | 330 W |
| D. | 550 W |
| Answer» D. 550 W | |
| 14. |
440 V, 77 A, 700 rpm DC separately excited motor having a resistance of 0.11 ohms excited by an external dc voltage source of 24 V. Calculate the torque developed by the motor on full load. |
| A. | 453.51 N-m |
| B. | 451.24 N-m |
| C. | 440.45 N-m |
| D. | 452.64 N-m |
| Answer» B. 451.24 N-m | |