a) Adds to the supply voltage
b) Regulates its armature voltage
c) Helps in energy conversion
d) Usually exceeds the supply voltage

Ans: (c)

a) Welded to the shaft
b) Keyed to the shaft
c) Soldered to the shaft
d) Both to the shaft

Ans: (b)

a) Set of screws
b) Key
c) Soldering
d) Welding

Ans: (a)

a) Efficiency
b) Speed regulation
c) Starting torque
d) Running torque

Ans: (a)

a) To reduce hysteresis loss
b) To reduce eddy current loss
c) To reduce the cost of core
d) To reduce the mass of the armature

Ans: (b)

a) 0.1Ω
b) 2Ω
c) 20Ω
d) 400Ω

Ans: (a)

a) power input mainus copper loss
b) armature current multiplied by back emf
c) armature current multiplied by supply emf
d) power input minus mechanical loss

Ans: (b)

a) Increases proportionately
b) Remains constant
c) Increases slightly
d) Reduces slightly

Ans: (d)

a) It draws very current
b) It develops excessive speed and get damaged
c) There results heavy sparking at the brushes
d) Circuit gets open circuited

Ans: (b)

a) Shunt motor
b) Series motor
c) Cumulative compound motor
d) Differential compound motor

Ans: (b)

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