MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 788 ω resistor with 178 A current flowing through it. |
| A. | 24.96 MW |
| B. | 24.44 MW |
| C. | 24.12 MW |
| D. | 26.18 MW |
| Answer» B. 24.44 MW | |
| 2. |
A 3-phase induction motor runs at almost 1000 rpm at no load and 950 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. | 30 revolution per minute |
| B. | 40 revolution per minute |
| C. | 60 revolution per minute |
| D. | 50 revolution per minute |
| Answer» E. | |
| 3. |
In an induction motor, when the number of stator slots is equal to an integral number of rotor slots _________ |
| A. | There may be a discontinuity in torque slip characteristics |
| B. | A high starting torque will be available |
| C. | The maximum torque will be high |
| D. | The machine may fail to start |
| Answer» E. | |
| 4. |
The slope of the V-I curve is 5°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line. |
| A. | .3254 Ω |
| B. | .3608 Ω |
| C. | .3543 Ω |
| D. | .3443 Ω |
| Answer» E. | |
| 5. |
The frame of an induction motor is made of _________ |
| A. | Aluminum |
| B. | Silicon steel |
| C. | Cast iron |
| D. | Stainless steel |
| Answer» D. Stainless steel | |
| 6. |
Calculate the moment of inertia of the disc having a mass of 54 kg and diameter of 91 cm. |
| A. | 5.512 kgm2 |
| B. | 5.589 kgm2 |
| C. | 5.487 kgm2 |
| D. | 5.018 kgm2 |
| Answer» C. 5.487 kgm2 | |
| 7. |
Calculate the phase angle of the sinusoidal waveform z(t)=78sin(456πt+2π÷78). |
| A. | π÷39 |
| B. | 2π÷5 |
| C. | π÷74 |
| D. | 2π÷4 |
| Answer» B. 2π÷5 | |
| 8. |
An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the rotor current of the motor in Hz is __________ |
| A. | 2 |
| B. | 4 |
| C. | 3 |
| D. | 1 |
| Answer» B. 4 | |
| 9. |
A three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is ____________ |
| A. | Slip frequency |
| B. | Supply frequency |
| C. | The frequency corresponding to rotor speed |
| D. | Zero |
| Answer» B. Supply frequency | |