Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. ____ motor has the best speed regulation
a. series
b. cumulatively compounded
c. shunt
d. differentially compounded
Q. The deciding factor in the selection of a dc motor for a particular application is its ____ characteristics
a. speed-torque
b. speed-armature current
c. torque-armature current
d. none of the above
Q. A series motor will over speed when ____.
a. the load is increased
b. the field is opened
c. the armature circuit is opened
d. laod is removed
Q. A cumulatively compounded motor does not run at dangerous speed at light loads because of the presence of ______.
a. shunt winding
b. series winding
c. interpoles
d. compensating windings
Q. DC shunt motor are used in those applications where____ is required.
a. high statring torque
b. practically constant speed
c. high no load speed
d. variable speed
Q. DC series motor are used in those applications where ____ is required.
a. high statring torque
b. constant speed
c. low no load speed
d. none of the above
Q. Cumulatively compounded motors are used where we require _____.
a. variable speed
b. poor speed regulation
c. sudden heavy loads for short duration
d. none of the above
Q. ____ motors never use belt- connected loads.
a. series
b. shunt
c. cumulatively compounded
d. differential compound
Q. For 20% increase in current, the motor that will give the greastest increase in torque is ___ motor
a. shunt
b. series
c. cumulatively compounded
d. differnetially compounded
Q. Each commutator segment is connected to armature conductor by means of ___
a. insulator
b. dielectric
c. copper lug
d. resistance wire
Q. In a 4 pole machine___
a. alternate poles are north and south
b. two north poles follow two south poles
c. in all there are north poles
d. in all there are south poles
Q. If the applied voltage of dc motor is reduced to half with load torque doubled the armature current will be____
a. unaltered
b. zero
c. doubled
d. half
Q. Back EMF of DC motor depends on
a. field flux
b. shape of conductor
c. type of sliprings
d. brush material
Q. A DC motor develops torque of the 100Nm at 400 rpm, at 300 rpm a motor will develop torque of___.
a. 133nm
b. 100nm
c. 67nm
d. 180nm