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JE 2019 || Day 14 || DC Machines Quiz 2
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Question 1
A d.c. shunt motor is taking 
at 
and developing 9 b.h.p. Armature resistance 
and shunt field resistance 
The copper loss is
at and developing 9 b.h.p. Armature resistance and shunt field resistance The copper loss is Question 2
A 
d.c. series motor is taking a current of 
Resistance of armature 
and resistance of series field 
What is the back e.m.f.?
d.c. series motor is taking a current of Resistance of armature and resistance of series field What is the back e.m.f.? Question 3
A 220V d.c. shunt motor takes a total current of 80A and runs at 800 r.p.m. The resistance of shunt field is 50Ω and that of armature 0.1Ω The iron and friction losses amount to 1600W. What is the shaft torque?
Question 4
A 
d.c. shunt motor takes a total current of 
and runs at 800 r.p.m. Resistance of shunt field is 
and that of armature 
The iron and friction losses amount to 
What is the armature torque?
d.c. shunt motor takes a total current of and runs at 800 r.p.m. Resistance of shunt field is and that of armature The iron and friction losses amount to What is the armature torque? Question 5
A 
shunt motor has an armature resistance of 
and a field resistance of 
Find the back e.m.f. when giving an output of 
at 85% efficiency.
shunt motor has an armature resistance of and a field resistance of Find the back e.m.f. when giving an output of at 85% efficiency. Question 6
D.C. series motors are used in those applications where………………..is required.
Question 7
A cumulatively compounded motor does not run at dangerous speed at light loads because of the presence of…………………
Question 8
In very large d.c. motors with severe heavy duty, armature reaction effects are corrected by…………………..
Question 9
The shaft torque 
in a d.c. motor is less than total armature torque 
because of……………….in the motor.
in a d.c. motor is less than total armature torque because of……………….in the motor. Question 10
The speed of a d.c. motor is…………………
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ESE & GATE EEGeneralApr 14ESE & GATE EE
