Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. Air ducts are provided in armature core to
a. increase the core area
b. cool the armature
c. to accommodate the windins
d. none of these
Q. Due to which of the following reasons, copper brushes in D.C. machine are used?
a. when high voltage and small currents are involved
b. when low voltage and high currents are involved
c. in both of the above cases
d. in none of the above cases
Q. In a dc generator, the eddy current power loss is
a. directly proportional to thickness of each lamination
b. inversely proportional to thickness of each lamination
c. directly proportional to square of thickness of each lamination
d. none of the above
Q. ----- is the power equation of dc motor
a. via = ebia + ia2 ra
b. via = ebia + ia ra2
c. vn = eb n + nia ra
d. via = eb2ia + ia2 ra
Q. A 8 pole dc generator has a lap wound armature having 400 armature turns. If flux/pole is 10mWb and emf generated in armature is 200v then speed is -----rpm
a. 2000 rpm
b. 1500 rpm
c. 500 rpm
d. 1000rpm
Q. The stator of I.M. motor is made up off---------- laminations.
a. cast iron
b. cast steel
c. silicon steel
d. steel
Q. Stator part of I.M. has slots to hold -------
a. rotor winding
b. stator winding
c. shaft
d. brush
Q. Stator windings are insulated from core with the help of
a. slot insulator
b. epoxy coating
c. a or b
d. none
Q. 3 phase I.M. are classified as --- and---- based on rotor construction.
a. slip ring & squirrel cage
b. split phase &squirrel cage
c. capacitor start motor& slip ring
d. shaded pole& capacitor start
Q. When a induction motor is switched on a rotor frequency is
a. 60
b. same as supply frequency
c. same as slip frequency
d. zero
Q. when the rotor of induction motor is standstill the value of slip is
a. zero
b. 1
c. 100
d. infinite
Q. Squirrel cage I.M.motor has skewed rotor bar to help to produce constant --- .
a. voltage
b. torque
c. frequency
d. magnetic field