Hopkinson’s test on D.C. machines is conducted at_______________?
Hopkinson’s test on D.C. machines is conducted at_______________?
A. no-load
B. part load
C. full-load
D. overload
Similar Posts
Which of the following loss in a D.C. generator varies significantly with the load current ?
Which of the following loss in a D.C. generator varies significantly with the load current ?
A. Field copper loss
B. Windage loss
C. Armature copper loss
D. None of the aboveAccording to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?
According to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?
A. current in the conductor aovtaat of conductor
C. resultant force on conductor
D. none of the aboveWhat will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
A. The motor will stop
B. The motor will continue to run
C. The armature may burn
D. The motor will run noisyThe 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 lossesWhich of the following motor is preferred for operation in highly explosive atmosphere ?
Which of the following motor is preferred for operation in highly explosive atmosphere ?
A. Series motor
B. Shunt motor
C. Air motor
D. Battery operated motorFollowing motor is used where high starting torque and wide speed range control is required?
Following motor is used where high starting torque and wide speed range control is required?
A. Single phase capacitor start
B. Induction motor
C. Synchronous motor
D. D.C. motor
E. None of the above