Top 150+ Solved Design of Electrical Machines MCQ Questions Answer
Q. The value of exciting or magnetizing current depends upon which of the followingfactors ?
a. Total m.m.f. required
b. The number of turns in the exciting winding
c. The way in which the winding is distributed
d. All of the above
Q. Tractive magnets are operated from
a. c. supply
b. d.c. supply
c. either a. or d. supply
d. none of the above
Q. electromagnets generally function as holding magnets.
a. Tractive
b. Portative
c. Either of the above
d. None of the above
Q. Which of the following is the commonly used type of electromagnets ?
a. Flat-faced armature type
b. Horse shoe type
c. Flat-faced plunger type
d. All of the above
Q. are used for construction of core of electromagnets.
a. Soft magnetic materials
b. Hard magnetic materials
c. Either (a) or (b)
d. None of the above
Q. The design of electromagnets is based upon which of the following fundamentalequations ?
a. Force equation
b. Magnetic circuit equation
c. Heating equation
d. All of the above
Q. When the two coil sides forming a coil are spaced exactly one pole pitch apart they aresaid to be of
a. short pitch
b. full pitch
c. either of the above
d. none of the above
Q. are always double layer type.
a. Closed windings
b. Open windings
c. Either of the above
d. None of the above
Q. The distance between the starts of two consecutive coils measured in terms of coilsides is called
a. front pitch
b. winding pitch
c. commutator pitch
d. back pitch
Q. The winding where dummy coils are used is sometimes called
a. duplex winding
b. triplex winding
c. forced winding
d. none of the above
Q. Dummy coil should not be used in
a. small machines
b. large machines
c. either (a) or (b)
d. none of the above
Q. Power transformers have rating
a. equal to 50 kVA
b. equal to 100 kVA
c. above 200 kVA
d. none of the above
Q. Power transformers should be designed to have maximum efficiency
a. at one-fourth load
b. at one-half load
c. at or near full load
d. any of the above
Q. In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
a. 5 percent
b. 10 percent
c. 15 percent
d. 30 percent
Q. Yokes with rectangular cross-section are used for
a. small capacity transformers
b. medium capacity transformers
c. large capacity transformers
d. any of the above