DC Motors MCQs
Practice free DC Motors multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 313 questions — no login required.
Question 82easy
In d.c. machines, constant loss is composed of
Question 83easy
An amplidyne develops an output voltage of 100 volts at an armature speed of n r.p.m. If its armature is now driven at 2n r.p.m., then its output voltage is
Question 84easy
A short-shunt cumulatively compounded d.c. generator builds up a voltage of 220 V at no load and rated speed. If it is operated as a differentially compounded generator, other things remaining the same, then it would build up
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Question 85easy
A dc shunt motor is rotating in clockwise direction as viewed from one end. The polarity of connection of the armature and field winding are reversed simultaneously. The motor will
Question 86easy
A self-excited d.c. shunt motor is ranning at no load at 1000 rpm. If the terminal voltage is reduced to 50% of its original value, the no-load speed of the otor will be?rpm.
Question 87easy
lithe applied voltage of a dc shunt motor is halved with the load torque doubled, the following approximate changes will be observed. Speed is
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Question 88easy
A d.c. shunt motor is running with a certain load. The effect of adding an external resistance in the field circuit is to
Question 89easy
Which of the following motor has high starting torque?
Question 90easy
A d.c. series motor with rated voltage of 230 volts is connected to an a.c. supply of 230 volts. It will