MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the total heat dissipated in a rotor resistor of 14.23 Ω when .65 A current flows through it. |
| A. | 6.45 W |
| B. | 6.01 W |
| C. | 6.78 W |
| D. | 6.98 W |
| Answer» C. 6.78 W | |
| 2. |
Calculate the time period of the waveform i(t)=sin(πt+6π÷4)+sin(πt+5π÷6). |
| A. | 2 sec |
| B. | 4 sec |
| C. | 5 sec |
| D. | 3 sec |
| Answer» B. 4 sec | |
| 3. |
The slope of the V-I curve is 1.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .019 Ω |
| B. | .036 Ω |
| C. | .075 Ω |
| D. | .084 Ω |
| Answer» B. .036 Ω | |
| 4. |
The no-load circuit test on a 3-Φ induction motor is conducted at a rotor speed of _______ |
| A. | Zero |
| B. | < Ns |
| C. | > Ns |
| D. | Ns |
| Answer» E. | |
| 5. |
R.M.S value of the sinusoidal waveform q(t)=2.11cos(87.25t+78π÷478.23). |
| A. | 1.49 V |
| B. | 1.56 V |
| C. | 1.12 V |
| D. | 1.78 V |
| Answer» B. 1.56 V | |
| 6. |
Calculate the amplitude of the sinusoidal waveform z(t)=.27sin(.369πt+.142π÷4.25). |
| A. | .287 |
| B. | .270 |
| C. | .216 |
| D. | .287 |
| Answer» C. .216 | |
| 7. |
A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20. |
| A. | 418.56 |
| B. | 420.12 |
| C. | 421.23 |
| D. | 422.45 |
| Answer» C. 421.23 | |