Three point starter can be used for______________?
Three point starter can be used for______________?
A. series motor only
B. shunt motor only
C. compound motor only
D. both shunt and compound motor
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If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
A. Starting torque
B. Operating speed
C. Full-load current
D. All of the aboveWhich of the following method is used for the speed control of DC shunt motor?
Which of the following method is used for the speed control of DC shunt motor?
A. voltage control method
B. flux control method
C. rheostat control method
D. all of the aboveThe condition for maximum power in case of D.C. motor is______________?
The condition for maximum power in case of D.C. motor is______________?
A. back e.m.f. = 2 x supply voltage
B. back e.m.f. = | x supply voltage
C. supply voltage = | x back e.m.f
D. supply voltage = back e.m.fThe direction of rotation of a D.C. series motor can be changed by___________?
The direction of rotation of a D.C. series motor can be changed by___________?
A. interchanging supply terminals
B. interchanging field terminals
C. either of A. and B. above
D. None of the aboveWhich of the following application requires high starting torque ?
Which of the following application requires high starting torque ?
A. Lathe machine
B. Centrifugal pump
C. Locomotive
D. Air blowerD.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