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AE 2019 || Day 9 || Electrical Machines Quiz 1
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Question 1
The speed of a separately excited dc motor is varied by varying the armature voltage in the range zero the base speed and by varying the field current above the base speed. It is suitable for constant
Question 2
The induced emf of a dc machine running at 750 rpm is 220 V. The percentage increase in field flux for generating an induced emf of 250 V at 700 rpm would be
Question 3
In case of dc motor, maximum mechanical power is developed when back emf equals
Question 4
The overall efficiency of a dc shunt generator is maximum when its variable loss equals
Question 5
A separately excited dc generator is feeding a dc shunt motor. If the load torque on the motor is reduced to half, then
Question 6
In a dc machine running with a heavy load, and with the brushes located on the geometrical neutral axis sparking occurs
at the brushes during commutation, because of
at the brushes during commutation, because of
Question 7
A dc motor operated from a type A chopper is switched to type B chopper. How does the motor operate when type A and B are in operation respectively?
Question 8
Consider the following parts of a dc machine :
1) Yoke
2) Armature core
3) Brushes
4) Pole core
Which of the above parts are subjected to iron loss?
1) Yoke
2) Armature core
3) Brushes
4) Pole core
Which of the above parts are subjected to iron loss?
Question 9
The armature MMF waveform of a dc machine is
Question 10
Which one of the following curves represents the speed-torque characteristic of a d.c. series motor?
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ESE & GATE EEGeneralApr 6ESE & GATE EE
