Which D.C. motor is preferred for elevators ?
Which D.C. motor is preferred for elevators ?
A. Shunt motor
B. Series motor
C. Differential compound motor
D. Cumulative compound motor
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For constant torque drive which speed control method is preferred ?
For constant torque drive which speed control method is preferred ?
A. Field control
B. Armature voltage control
C. Shunt armature control
D. Mechanical loading systemWhich 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 motorWhich 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 motorTo get the speed of D.C, motor below the normal without wastage of electrical energy is used?
To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
A. Ward Leonard control
B. rheostatic control
C. any of the above method
D. none of the above methodThe purpose of retardation test on D.C. shunt machines is to find out____________?
The purpose of retardation test on D.C. shunt machines is to find out____________?
A. stray losses
B. eddy current losses
C. field copper losses
D. windage lossesD.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
A. series motor
B. shunt motor
C. compound motor
D. any of the above