Electronic Engineering DC Motors MCQs - Electronic Engineering
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DC Motors questions and answers. Electronic Engineering Multiple choice questions and answer dc Motors interview.
- Drive for a water pump
- Fan motor
- Starter for a car
- Motor operation in AC or DC
Question 1: In which of the following applications DC series motor is invariably tried?
Answers: Starter for a car
- back EMF increases and current drawn decrease
- back EMF decreases and current drawn increases
- back EMF as well as current drawn both decrease
- back EMF as well as current drawn both increase
Question 2: When the speed of a dc motor increases?
Answers: back EMF increases and current drawn decrease
- Low speed operation
- Fixed speed operation
- High speed operation
- Variable speed operation
Question 3: For which of the following applications a DC motor is preferred over an AC motor?
Answers: Variable speed operation
- Single phase capacitor start
- DC motor
- Synchronous motor
- Induction motor
Question 4: Following motor ls used where high starting torque and wide speed range control is required?
Answers: DC motor
- on armature
- none of the above
- on yoke in the pole faces
- on yoke in the interpolar gap
Question 5: Compensating winding in a DC machine is placed?
Answers: on yoke in the pole faces
- series motor
- any of the above
- shunt motor
- compound motor
Question 6: DC motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this?
Answers: compound motor
- motor will burn
- motor will burn
- motor will run at very slow speed
- motor will run at very high speed
Question 7: In a DC motor if the back EMF is absent?
Answers: motor will burn
- Retardation test
- Hopkinson's test
- Swinburne's test
- none of the above
Question 8: Which of the following methods is most economical for finding the no-load losses of a large DC shunt motor?
Answers: Swinburne's test
- winding getting overheated
- starter getting damaged
- busbars getting heated
- bearings getting overheated
Question 9: In an overloaded motor main danger arises due to?
Answers: winding getting overheated
- the field
- the commutator
- the brushes
- the armature
Question 10: ln the DC Motor the iron losses occur in?
Answers: the armature
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Correct: 0 Wrong: 0
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