| 1. | Differentially compound dc motors can find application is requiring ? | |
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high starting torque
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low starting torque
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variable speed
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frequent on-off cycles
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Report Question| 2. | The direction of rotation of a D.C. series motor can be changed by ? | |
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interchanging supply terminals
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interchanging field terminals
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either of (a) and (b) above
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None of the above
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| 3. | In which of the following applications D.C. series motor is invariably tried ? | |
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Starter for a car
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Drive for a water pump
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Fan motor
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Motor operation in A.C. or D.C.
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| 4. | When the speed of a dc motor increases ? | |
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back e.m.f. increases and current drawn decrease
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back e.m.f. as well as current drawn both increase
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back e.m.f. as well as current drawn both decrease
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back e.m.f. decreases and current drawn increases
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| 5. | The plugging gives the ? | |
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zero torque braking
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smallest torque braking
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highest torque braking
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none of the above
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| 6. | D.C. series motors are used ? | |
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where load is constant
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where load changes frequently
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where constant operating speed is needed
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in none of the above situations
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| 7. | The power mentioned on the name plate of an electric motor indicates ? | |
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the power drawn in kW
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the power drawn in kVA
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the gross power
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the output power available at the shaft
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| 8. | For the same H.P. rating and full load speed, following motor has poor starting torque ? | |
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shunt
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series
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differentially compounded
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cumulatively compounded
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| 9. | In D.C. shunt motors as load is reduced ? | |
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the speed will increase abruptly
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the speed will increase in proportion to reduction in load
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the speed will remain almost constant
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the speed will reduce
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| 10. | Which D.C. motor will be preferred for constant speed line shafting ? | |
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Cumulative compound motor
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Differentially compound motor
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Shunt motor
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Series motor
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