Electric Motor that convert DC - Electronic Engineering
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A DC Motor is defined as a class of electric motors that convert direct current energy into mechanical energy. From the above definition of a DC Motor.
- series motor only
- shunt motor only
- both shunt and compound motor
- compound motor only
Question 1: Three point starter can be used for?
Answers: both shunt and compound motor
- Field winding
- Slip rings
- Commutator
- Armature winding
Question 2: In DC motor which of the following can sustain the maximum temperature rise?
Answers: Field winding
- DC shunt motor
- induction motor
- all of above motors
- DC series motor
Question 3: Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of?
Answers: DC series motor
- Voltage control method
- Armature control method
- Field control method
- All above methods
Question 4: Which of the following method of speed control of DC machine will offer minimum efficiency?
Answers: Armature control method
- reduce to one-fourth value
- increase four folds
- remain unchanged
- be doubled
Question 5: ln case the back EMF and the speed of a dc motor are doubled, the torque developed by the motor will?
Answers: remain unchanged
- DC shunt motor
- DC series motor
- Universal motor
- Synchronous motor
Question 6: Which of the following motors one will choose to drive the rotary compressor?
Answers: Synchronous motor
- DC shunt motor
- Single phase induction motor (split phase start or induction run motor)
- DC series motor
- Reluctance motor
Question 7: Which of the following motors is usually used in house-hold refrigerators?
Answers: Single phase induction motor (split phase start or induction run motor)
- magnetic field
- number of conductors
- all above factors
- current flow through the conductors
Question 8: Torque developed by a DC motor depends upon
Answers: all above factors
- Shunt motor with commutating pole
- Series motor without commutating poles
- Compound motor without commutating poles
- Series motor with commutating poles
Question 9: Which of the following DC motors has the least drop in speed between no-load and nominal load?
Answers: Shunt motor with commutating pole
- will damage the commutator
- will produce excessive line voltage drop
- is many times its full-load current
- will produce very low starting torque
Question 10: Which of the following statement is incorrect ? If a starter is not used with large DC motor, it will draw a starting current which?
Answers: will produce very low starting torque
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