McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 101. |
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on |
| A. | running winding |
| B. | rotor winding |
| C. | field winding |
| D. | compensating winding |
| Answer» A. running winding | |
| 102. |
Which of the following statements regarding repulsion-start induction motor is incorrect ? |
| A. | It requires more maintenance of commutator and other mechanical devices |
| B. | It makes quite a bit of noise on starting |
| C. | In fractional horse power motors, it has replaced the capacitor motors |
| D. | It is not easily reversed |
| Answer» C. In fractional horse power motors, it has replaced the capacitor motors | |
| 103. |
A.C. series motor as compared to D.C. series motor has |
| A. | smaller brush width |
| B. | less number of field turns |
| C. | more number of armature turns |
| D. | all of the above |
| Answer» D. all of the above | |
| 104. |
Locked rotor current of a shaded pole motor is |
| A. | equal to full load current |
| B. | less than full load current |
| C. | slightly more than full load current |
| D. | several times the full load current |
| Answer» C. slightly more than full load current | |
| 105. |
Speed control of a universal motor is achieved by |
| A. | varying field flux with tapped field windings |
| B. | connecting rheostat in series |
| C. | applying variable voltage by means of silicon controlled rectifier |
| D. | all of the above methods |
| Answer» D. all of the above methods | |
| 106. |
Hysteresis motor is particularly useful for high-quality record players and tape- recorders because |
| A. | it revolves synchronously |
| B. | it is not subject to any magnetic or mechanical vibrations |
| C. | it can be easily manufactured in extremely small sizes of upto 1 W output |
| D. | it develops hysteresis torque which is extremely steady both in amplitude and phase |
| Answer» D. it develops hysteresis torque which is extremely steady both in amplitude and phase | |
| 107. |
Which of the following statements regarding hysteresis motor is in incorrect ? |
| A. | It is extremely sensitive to fluctuations in supply voltage |
| B. | Its high starting torque is due to its high rotor hysteresis loss |
| C. | It is extremely quiet in operation |
| D. | It accelerates from rest to full-speed almost instantaneously |
| Answer» A. It is extremely sensitive to fluctuations in supply voltage | |
| 108. |
Which of the following statements regarding single-phase induction motoris correct ? |
| A. | It requires only one winding |
| B. | It can rotate in one direction only |
| C. | It is self-starting |
| D. | It is not self-starting |
| Answer» D. It is not self-starting | |
| 109. |
The starting winding of a single-phase motor is placed in |
| A. | armature |
| B. | field |
| C. | rotor |
| D. | stator |
| Answer» D. stator | |
| 110. |
The speed of a universal motor is usually reduced by using |
| A. | gearing |
| B. | belts |
| C. | brakes |
| D. | chains |
| Answer» A. gearing | |
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