| 1. | The maximum end-play of a motor is about ? | |
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10 mm
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6 mm
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2.mm
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0.4 mm
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View Answer
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Report Question| 2. | Between Field's test and Hopkinson's test the main common thing is that both ? | |
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use negligible power
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are regenerative tests
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need two similar mechanically coupled motors
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need two electrically coupled series motors
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| 3. | Which of the following tests can be conducted on all types of D.C. machines ? | |
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Hopkinson's test
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Running down test
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Block rotor test
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Brake test
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| 4. | Hopkinson's test is conducted at ? | |
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no load
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part load
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low Load
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full load
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| 5. | If the no-voltage release of a D. C. Motor starter fails to work on resumption of supply after a break, the motor will ? | |
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not start automatically
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start automatically without trouble
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get damaged
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develop very low torque
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| 6. | The armature torque of the D.C. shunt motor is proportional to ? | |
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field flux only
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armature current only
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both (a) and (b)
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none of the above
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| 7. | If a D.C. motor is to be selected far conveyors which motor Would be preferred ? | |
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Series motor
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Shunt motor
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Differentially compound motor
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Cumulative compound motor
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| 8. | Which of the following loss in a D.C. generator is dissipated in the form of heat ? | |
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Mechanical loss
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Core loss
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Copper loss
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All of the above
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| 9. | ln a differentially compounded D.C. motor, if shunt field suddenly opens ? | |
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the motor will first stop and then run in opposite direction as series motor
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the motor will work as series motor and run at slow speed in the same direction
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the motor will work as series motor and run at high speed in the same direction
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the motor will not work and come to stop
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| 10. | The current drawn by the armature of D.C.. motor is directly proportional to ? | |
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the torque required
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the speed of the motor
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The voltage across the terminals
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none of the above
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