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Electrician Set-1
DC Motors
74

DC Motors MCQ - Electrician (Set-1) with Answers

74) In DC shunt motor, if the field is opened during running, what will happen to the motor ?

The direction of rotation will be reversed

The speed will decrease

The motor runs in dangerous speed and may bum out

The motor will not stop

Answer is:

The motor runs in dangerous speed and may bum out

DC Motors MCQ - Electrician (Set-1) with Answers

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Related DC Motors MCQ - Electrician (Set-1) with Answers

75) The D.C shunt motor speed is to be varied from zero to above normal with reversing facility having inherent stability of speed at all loads. What speed control method is to be used ?

Supply voltage speed control method

Ward-Leonard system of speed control

Shunt field control method

Armature speed control method

Answer is:

Ward-Leonard system of speed control

76) What is the cause for the DC motor's brush makes chattering or hissing noise during operation ?

Overloading

Insufficient brush tension

Short circuit in commutator segment

Incorrect brush spring pressure

Answer is:

Incorrect brush spring pressure

DC Motors MCQ - Electrician (Set-1) with Answers

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