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Electrician
Electrician Set-1
DC Motors
45

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

45) What will be the consequences if the field circuit of a D.C. shunt motor is opened when the motor is running at no load condition ?

The motor speed will be reduced drastically

The torque of the motor will be increased

The motor speed could become dangerously high

Field current will become zero and hence motor stops

Answer is:

The motor speed could become dangerously high

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

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

46) To start a DC shunt motor the type of starter used is :

2 point

3 point

4 point

Drum type

Answer is:

3 point

47) The connection of NVC in D.C. 3 point starter is across DC supply in series with

armature

starting resistor

overload relay

shunt field

Answer is:

shunt field

48) In a 3 point starter the No volt coil (NVC) is connected in series with :

armature

supply

starting resistor

field

Answer is:

field

49) A DC shunt motor connected through a 4 point starter starts normally when the starter handle is moved from OFF position to ON position. But the starter handle does not remain in ON position. One of the reason for the above is open in :

shunt field

protective resistor

starting resistor

overload coil

Answer is:

protective resistor

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

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