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Rajasthan Technical Education Second Year Paper 2016 – Electrical Machines I
The number of parallel paths for lap wound armature winding of DC generator is
(a) 2
(b) 4
(c) numbers of poles
(d) depends on manufacturer
Wave wound armature is best suited for
(a) low current, high voltage
(b) high current, low voltage
(c) high current, high voltage
(d) low current, low voltage
Laminating armature of DC machines reduces
(a) Hysteresis loss
(b) Eddy current loss
(c) Copper loss
(d) Friction loss
DC shunt generator may refuse to build the voltage because of
(a) No residual magnetism
(b) Field winding resistance is more than critical resistance
(c) Field winding is open circuited
(d) Any one among the above three
A DC shunt generator is running at 800 rpm generates 200 volts if speed is 1000 rpm then generated voltage will be
(a) 150 V
(b) 200 V
(c) 250 V
(d) 260 V
In DC compound generator series winding in comparison of shunt winding
(a) will be of thin wire
(b) will be of thick wire
(c) depends upon design
(d) will be same
The most likely causes of sparking at the brushes in dc machine is
(a) open coil in the armature
(b) defective interpoles
(c) incorrect brush spring pressure
(d) All of the above
Primary reason for providing compensating windings in dc generator is to
(a) Compensate for decrease in main flux
(b) Neutralize armature flux
(c) Neutralize cross magnetising flux
(d) maintain uniform flux distribution
In a 4 pole, 25 kW, 250 V wave wound DC shunt generator the current in each parallel path will be
(a) 62.5 A
(b) 125 A
(c) 31.25 A
(d) 250 A
The speed of a DC shunt motor can be increased above normal speed by
(a) increasing the field current
(b) decreasing the field current
(c) decreasing the terminal voltage
(d) increasing the armature resistance
The direction of rotation of dc compound motor can be reversed by interchanging connections of
(a) Armature
(b) Series field
(c) Shunt field
(d) Armature and Series field
Which of the following motor is suitable for electric locomotive ?
(a) DC shunt motor
(b) DC series motor
(c) DC short shunt compound motor
(d) DC long shunt compound motor
In DC series motor the armature current is reduced to 70% of it’s original value, the torque of the motor will be reduced by
(a) 49%
(b) 51%
(c) 50%
(d) 70%
DC series motor is alwasys started at some load to
(a) limit the flux
(b) limit the current
(c) limit the speed
(d) avoid sparking
Last Updated on – 7th April 2022
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