A) may ‘run away’ if the field gets opened B) is not suitable for high starting torque C) always runs at constant speed D) should always be started on load. Ans : (D)
A) 12.5 A B) 25 A C) 250 A D) 600 A. Ans : (A)
A) provide stronger magnetic field B) reduced noise C) facilitate high speed operation without vibrations D) provide adequate air for cooling the rotor winding. Ans : (A)
A) 4 poles B) 2 poles C) 6 poles D) 8 poles. Ans : (B)
A) shunt motor B) series motor C) cumulatively compound motor D) all of the above. Ans : (A)
A) Power line B) Rotating amplifier C) Prime moves D) Power pump. Ans : (B)
A) Armature current control B) Ward Leonard control C) Field resistance control D) It is not possible to run the motor at more than the rated rpm. Ans : (C)
A) Series motor B) Shunt motor C) Cumulatively compound motor D) All will have same percentage increase. Ans : (A)
A) Leonard test B) Hopkinson’s test C) Swinburne’s test D) Block rotor test. Ans : (C)
A) Field resistance control B) Ward Leonard control C) Armature circuit resistance control D) Any of the above. Ans : (A)