Computer Programming MCQs

5739 MCQs  (Page 74 of 574)

Which type of load is offered by cranes and hoists ?
A. Gradually varying load
B. Non-reversing, no-load start
C. Reversing, light start
D. Reversing, heavy start
Which of the following motors can be used for unity power factor ?
A. Capacitor run motor
B. Shaded pole motor
C. Hysteresis motor
D. Schrage motor
Which of the following single-phase motors has relatively poor starting torque ?
A. Universal motor
B. Repulsion motor
C. Capacitor motor
D. All single phase motors have zero starting torque
In which single-phase motor, the rotor has no teeth or winding ?
A. Split phase motor
B. Reluctance motor
C. Hysteresis motor
D. Universal motor
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?
A. High inductance of field and armature circuits
B. Induced current in rotor due to variations of flux
C. Fine copper wire winding
D. None of the above
The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?
A. Armature winding
B. Field winding
C. Either armature winding or field winding
D. None of the above
Which motor is normally free from mechanical and magnetic vibrations ?
A. Split phase motor
B. Universal motor
C. Hysteresis motor
D. Shaded pole motor
A reluctance motor____________?
A. Is self-starting
B. Is constant speed motor
C. Needs no d.c. excitation
D. All of the above