A. D.C. series motor
B. D.C. shunt motor
C. induction motor
D. all of above motors
Related Mcqs:
- Which D.C. motor is generally preferred for cranes and hoists ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor - The ratio of starting torque to full-load torque is least in case of____________?
A. series motors
B. shunt motors
C. compound motors
D. none of the above - Which of the following load normally needs starting torque more than the rated torque?
A. Blowers
B. Conveyors
C. Air compressors
D. Centrifugal pumps - Which of the following application requires high starting torque ?
A. Lathe machine
B. Centrifugal pump
C. Locomotive
D. Air blower - 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 - In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
A. 100% of the previous value
B. 50% of the previous value
C. 25% of the previous value
D. 10% of the previous value
E. none of the above - The armature torque of the D.C. shunt motor is proportional to____________?
A. field flux only
B. armature current only
C. both A. and B.
D. none of the above - For constant torque drive which speed control method is preferred ?
A. Field control
B. Armature voltage control
C. Shunt armature control
D. Mechanical loading system - Torque developed by a D.C. motor depends upon_____________?
A. magnetic field
B. active length of the conductor
C. current flow through the conductors
D. number of conductors
E. radius of armature
F. all above factors - A direct on line starter is used: for starting motors___________?
A. up to 5 H.P
B. up to 10 H.P
C. up to 15 H.P
D. up to 20 H.P
