DC Machine (Motor) MCQ Online Mock Test  

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Q-: 1) Which motor has the poorest speed control?

A) Differentially Compound motor

B) Cumulatively compound motor

C) Shunt motor

D ) Series motor

 

Q-: 2) Two d.c. series are connected in series to produce a torque T. now if the motors are connected in parallel, the torque produce will be

A)  T/4

B) T/2

C) 2 T

D) 4 T

 

Q-: 3) Which dc motor is generally preferred for cranes and holes?

A)  Series motor

B) Shunt motor

C) Cumulatively compound motor

D) Differentially compound motor

 

Q-: 4) Which motor has widest variety of method for speed control?

A)  DC shunt motor

B) Synchronous motor

C) Slip-ring induction motor

D) Schrage motor

 

Q-: 5) For battery charging, which of the following DC generators is used?

A)  DC series generator

B) DC Shunt generator

C) Short shunt compound generator

D) Long shunt compound generator

Q-:6) In Swinburn's method of testing dc machines, the shunt machine is run as a 

A) Motor at full load at rated speed and rated voltage. 

B) generator at full load at rated speed and rated voltage 

C) generator at no load at rated speed and rated voltage. 

D) motor at load at rated speed and rated voltage

 

Q-: 7) The No load Speed of DC series motor is

A)  Very high

B) Medium

C) Very high

D) small

 

Q-: 8) Interpoles are meant for

A)  Increasing the speed of the of the motor,

B) Increasing counter emf.

C) Strengthening the main field.

D) Reducing sparking at the commutator.

 

Q-: 9) A 4 pole 1200 rpm DC lap wound generator has 1520 conductors. IF the flux per pole is 0.01 Weber, the emf of generator is

A) 608 volt

B) 304 Volt

C) 152 volt

D) 76 volt

 

Q-: 10) The brushes of a DC machine should be physically placed on the

A)  Armature in the polar axis

B) Armature in the interpolar axis.

C) Commutator in the polar axis.

D) Commutator in the interpolar axis.