DC Motors MCQ Multiple Choice Questions Answers - Page 3 for Practice

Correct Answer is: reduce slightly

Correct Answer is: a resistance is connected in series with armature

Correct Answer is: a low resistance circuit

Correct Answer is: D.C. series motor

Correct Answer is: Commutator

Correct Answer is: line losses

Correct Answer is: full-load

Correct Answer is: compound motor

Correct Answer is: series motor

Correct Answer is: in none of the above situations.

Correct Answer is: machine tools

Correct Answer is: low starting torque

Correct Answer is: motor is run as a generator

Correct Answer is: cumulatively compounded

Correct Answer is: D.C. motor

Correct Answer is: torque will change but power will remain constant

Correct Answer is: Armature voltage control

Correct Answer is: it limits the starting current to a safe value

Correct Answer is: differentially compounded

Correct Answer is: Variable speed operation

Correct Answer is: All of the above

Correct Answer is: full-load

Correct Answer is: is to be derated by a factor recom-mended by manufacturer and select the next higher H.P. motor

Correct Answer is: burn due to heat produced in the field winding by .eddy currents

Correct Answer is: Series motor

Correct Answer is: this will make armature to take heavy current, possibly burning it

Correct Answer is: this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

Correct Answer is: independent of Ia

Correct Answer is: the motor will attain dangerously high speed 1

Correct Answer is: increase