MCQOPTIONS
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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 the active power in a 2 Ω resistor with 8 A current flowing through it. |
| A. | 125 W |
| B. | 128 W |
| C. | 123 W |
| D. | 126 W |
| Answer» C. 123 W | |
| 2. |
Calculate the value of the frequency if the inductive reactance is 72 Ω and the value of the inductor is 7 H. |
| A. | 1.63 Hz |
| B. | 1.54 Hz |
| C. | 1.78 Hz |
| D. | 1.32 Hz |
| Answer» B. 1.54 Hz | |
| 3. |
Calculate the reactive power in a 45 Ω resistor with 1.78 A current flowing through it. |
| A. | 28.8 VAR |
| B. | 23.4 VAR |
| C. | 25.82 VAR |
| D. | 0 VAR |
| Answer» E. | |
| 4. |
Calculate the active power in a 9.854 H inductor. |
| A. | 4.98 W |
| B. | 0 W |
| C. | 8.59 W |
| D. | 1 W |
| Answer» C. 8.59 W | |
| 5. |
A 3-phase induction motor runs at almost 70 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. | 30 revolution per minute |
| C. | 40 revolution per minute |
| D. | 50 revolution per minute |
| Answer» B. 30 revolution per minute | |
| 6. |
Calculate the velocity of the satellite if the angular speed is 87 rad/s and radius is 7.4 m. |
| A. | 643.8 m/s |
| B. | 642.4 m/s |
| C. | 641.9 m/s |
| D. | 643.2 m/s |
| Answer» B. 642.4 m/s | |
| 7. |
The slope of the V-I curve is 4.9°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .03 Ω |
| B. | .08 Ω |
| C. | .04 Ω |
| D. | .07 Ω |
| Answer» C. .04 Ω | |
| 8. |
Armature reaction is magnetizing in nature due to a purely resistive load in the synchronous generator. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
A particular voltage is made up of two components: a 5 A and a cosine wave of peak value 7.8 A. The average value of voltage is _________ |
| A. | Zero |
| B. | 35.14 A |
| C. | 78 A |
| D. | 5 A |
| Answer» E. | |
| 10. |
Calculate the moment of inertia of the satellite having a mass of 79 kg and diameter of 83 cm. |
| A. | 13.65 kgm2 |
| B. | 13.60 kgm2 |
| C. | 12.67 kgm2 |
| D. | 13.82 kgm2 |
| Answer» C. 12.67 kgm2 | |
| 11. |
Calculate the phase angle of the sinusoidal waveform i(t)=sin(.6πt+π÷.88). |
| A. | 100π÷88 |
| B. | 100π÷8 |
| C. | 100π÷8 |
| D. | π÷88 |
| Answer» B. 100π÷8 | |
| 12. |
A 38-pole, 3-phase, 80 Hz induction motor is operating at a speed of 12 rpm. The frequency of the rotor current of the motor in Hz is __________ |
| A. | 75.2 |
| B. | 76.1 |
| C. | 79.2 |
| D. | 79.6 |
| Answer» C. 79.2 | |
| 13. |
A particular current is made up of two components: a 10 A and a sine wave of peak value 14.14 A. The average value of current is _________ |
| A. | Zero |
| B. | 24.14 A |
| C. | 10 A |
| D. | 14.14 A |
| Answer» D. 14.14 A | |