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JE 2019 || Day 13 || DC Machines Quiz 1
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Question 1
The current drawn by a 
d.c. motor of armature resistance 
and back e.m.f. 
is
d.c. motor of armature resistance and back e.m.f. is Question 2
By putting controller resistance in series with the armature of a d.c. motor, we can obtain speeds
Question 3
A 240 V series motor takes 
when giving its rated output at 
Its resistance is 
Find what resistance must be added to obtain rated torque at starting?
when giving its rated output at Its resistance is Find what resistance must be added to obtain rated torque at starting? Question 4
A 
shunt motor develops 
when taking 
The field resistance is 
and armature resistance is 
What are the total losses?
shunt motor develops when taking The field resistance is and armature resistance is What are the total losses? Question 5
The commutating-pole winding is connected in
Question 6
A 
shunt motor has 4 poles and a 2 circuit wave connected armature winding with 492 conductors. The flux per pole is 
and the full-load efficiency is 92%. The armature and commutating field windings have a total resistance of 
What is the full-load speed? The shunt field resistance is 
shunt motor has 4 poles and a 2 circuit wave connected armature winding with 492 conductors. The flux per pole is and the full-load efficiency is 92%. The armature and commutating field windings have a total resistance of What is the full-load speed? The shunt field resistance is Question 7
Calculate the mean force on each conductor of a 
14-pole shunt motor with lap-connected armature winding when running at 
and taking a current of 
Each conductor has an active length of 33 cm and the armature diameter is 130 cm. The total gap flux
per pole is
and the mean flux density in the slots is 
14-pole shunt motor with lap-connected armature winding when running at and taking a current of Each conductor has an active length of 33 cm and the armature diameter is 130 cm. The total gap fluxper pole is
and the mean flux density in the slots is Question 8
The armature of a 4-pole shunt motor has a lap winding accommodated in 60 slots, each containing 20 conductors. If the useful flux per pole is 
the armature torque developed when the armature current is 
is……………
the armature torque developed when the armature current is is…………… Question 9
A d.c. motor runs at 1725 r.p.m. at full-load and 1775 r.p.m. at no-load. The speed regulation is…………………….
Question 10
A 
series motor takes a current of 
and runs at 
Armature resistance 
and series field resistance 
If iron and friction losses amount to 
what is the overall efficiency?
series motor takes a current of and runs at Armature resistance and series field resistance If iron and friction losses amount to what is the overall efficiency? - 685 attempts
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ESE & GATE EEGeneralApr 13ESE & GATE EE
