| 1. | Locked rotor current of a shaded pole motor is ? | |
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equal to full load current
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less than full load current
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slightly more than full load current
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none of the above
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Report Question| 2. | Theory involved in analysis of the performance of single phase induction motor is ? | |
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Double field revolving theory
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cross field theory
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Double field revolving theory and cross field theory both
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None of these
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| 3. | Hysteresis motor is particularly useful for high-quality record players and tape recorders because ? | |
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it revolves synchronously
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it is not subject to any magnetic or mechanical vibrations
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it can be easily manufactured in extremely small sizes
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it develops hysteresis torque which is extremely steady both in amplitude and phase
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| 4. | For the transmission line, if booster transformers are to be used, preferred location will be ? | |
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at the receiving end
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at the sending end
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at the intermediate point
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anywhere in the line
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| 5. | Wooden poles are not used because ? | |
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they easily rot below the ground level and limited to line voltage of 11 kV
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light in weight
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can easily he fitted and shifted
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cheap in cost
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| 6. | Electro-mechanical voltage regulators generally find applications in ? | |
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generators
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transformers
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reactors
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all option are correct
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| 7. | The material for armouring on cable is usually ? | |
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galvanised steel wire
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steel tape
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Both galvanised steel wire and steel tape
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None of these
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| 8. | Towers are used in ? | |
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distribution
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transmission
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telephone
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street light
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| 9. | Different types of relays are used in control circuits. They operate under predetermined conditions to full-fill the control requirement. Some relays are capable of operating with time-delay. Which one of the following is used as time delay relay ? | |
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Reed relay
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Electromagnetic relay
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Clapper type armature relay
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Thermal relay
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| 10. | Bucholz relay protects the transformer from ? | |
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internal faults
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external faults
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both internal and external faults
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short circuit fault
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