Top 150+ Solved Electrical Drives and Controls (EDC) MCQ Questions Answer
Q. An electric motor is having constant output power. So, motor will have a torque speed characteristic
a. circle about the origin.
b. straight line parallel to the speed axis.
c. straight line through the origin.
d. rectangular hyperbola
Q. In which of the following case we will get maximum power?
a. ea = 2 x supply voltage
b. ea = supply voltage
c. supply voltage = 2 x ea
d. supply voltage = 4 x ea
Q. What is the form of the progressive windings?
a. double layer diamond coil windings
b. single layer diamond coil windings
c. multi layer diamond coil windings
d. three layer diamond coil windings
Q. When is the skein winding made use of?
a. when small amount of relatively small size wire is used
b. when large amount of relatively small size wire is used
c. when large amount of relatively large size wire is used
d. when small amount of relatively large size wire is used
Q. What kind of motor employs the skein winding made use of?
a. maximum horse power single phase induction motor
b. fractional horse power single phase induction motor
c. minimum horse power single phase induction motor
d. zero horse power single phase induction motor
Q. Which winding is mostly used winding in the single phase induction motor?
a. circular winding
b. concentric winding
c. progressive winding
d. skein winding
Q. What is/are the advantages of the skein winding?
a. low cost to wind
b. low cost to insert
c. permits some freedom of choice of distribution
d. low cost to wind, low cost to insert, permits some freedom of choice of distribution
Q. What material is used in the tunnel of the rotor of the single phase induction motor?
a. aluminium
b. copper
c. steel
d. wood
Q. What type of operations are used in the starting switches?
a. mechanical operation
b. electrical operation
c. centrifugal operation and mechanical operation
d. centrifugal operation
Q. Thyristor controlled starter is preferred over DOL starter due to
a. lesser losses
b. controlled direction
c. least resistance offered
d. all of the mentioned
Q. The effect of fringing increases as we
a. increase air gap
b. decrease air gap
c. increase in flux density
d. introduce more ferric core material
Q. The post effects of the armature reaction is
a. main field distortion
b. shift in mna
c. reduction in main field
d. none of the mentioned
Q. If the students give a forward shift of 10° to the dc generator, then it
a. reduces flux per pole
b. improves flux per pole
c. increases the flux density in core
d. none of the mentioned
Q. A dc machine is run at rated speed in forward direction and then in backward direction. It is observed that, speeds of the rotation are different, then it leads to the conclusion of
a. incorrect brush placement
b. incorrect pole and core alignment
c. incorrect field supply
d. all of the mentioned