Which D.C. motor has got maximum self loading property?
Which D.C. motor has got maximum self loading property?
A. Series motor
B. Shunt motor
C. Cumulatively compounded ‘motor
D. Differentially compounded motor
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Sparking at the commutator of a D.C. motor may result in____________?
Sparking at the commutator of a D.C. motor may result in____________?
A. damage to commutator segments
B. damage to commutator insulation
C. increased power consumption
D. all of the aboveIn case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?
In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?
A. 100%
B. around 90%
C. anywhere between 75% and 90%
D. less than 50%Which of the following motor has the poorest speed regulation ?
Which of the following motor has the poorest speed regulation ?
A. Shunt motor
B. Series motor
C. Differential compound motor
D. Cumulative compound motorIn D.C. machines fractional pitch winding is used__________?
In D.C. machines fractional pitch winding is used__________?
A. to improve cooling
B. to reduce copper losses
C. to increase the generated e.m.f.
D. to reduce the sparkingWhich of the following motors is most suitable for signalling devices and many kinds of timers ?
Which of the following motors is most suitable for signalling devices and many kinds of timers ?
A. D.C. shunt motor
B. D.C. series motor
C. Induction motor
D. Reluctance motorA D.C. series motor is that which______________?
A D.C. series motor is that which______________?
A. has its field winding consisting of thick wire and less turns
B. has a poor torque
C. can be started easily without load
D. has almost constant speed