Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. If number of conductors in a dc generator is Z then total number of turns are
a. z
b. 2z
c. z/2
d. 4z
Q. What is the flux in the armature core section of a dc machine if the air gap flux be ø Wb?
a. ø
b. 0.1 ø
c. 1.5 ø
d. ø /2
Q. The flux leakage coefficient in dc machine is usually
a. 0.6 to 0.8
b. 1.05
c. 1.2 to 1.3
d. 2 to 2.5
Q. The electrical equivalent of gross mechanical power developed in a dc motor is
a. vil
b. ebil
c. ebia
d. ebish
Q. The armature torque is ------ that of shaft torque
a. less than
b. same as
c. greater than
d. none of these
Q. The speed of dc motor is highest on
a. no load
b. 70% of full load
c. 10% of full load
d. 100% of full load
Q. With given power rating for lower current and higher voltage rating of a d.c. machine, one should prefer_________.
a. lap winding
b. wave winding
c. none of these
d. any of these
Q. If the number of poles in a lap wound generator be doubled, then the generated e.m.f will_________.
a. become half
b. become double
c. increase to four times
d. remains constant
Q. The counter emf of dc motor__________
a. often exceeds the supply voltage
b. aids the applied voltage
c. helps in energy conversion
d. regulates its armature voltage
Q. In a DC series motor increasing the load current will
a. decrese the speed
b. increase the speed
c. better commutation
d. increase the back emf
Q. The generator works on the principle of
a. statically induced emf
b. dynamically induced emf
c. mutul induction
d. kirchhoff\s law