D.C Motor: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY & Others competitive] DC Motor MCQ Questions And Answers
51. Three-point starter can be used for
(a) series motor only
(b) shunt motor only
(c) compound motor only
(d) both shunt and compound motor
Ans: d
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52. The total losses in a well-designed D.C. generator of 10 kW will be nearly
(a) 100 W
(b) 500 W
(c) 1000 W
(d) 1500 W
Ans:b
53. Speed control by Ward Leonard method gives uniform speed variation
(a) in one direction
(b) in both directions
(c) below normal speed only
(d) above normal speed only.
Ans: b
54. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be
(a) level compounded
(b) under compounded
(c) cumulatively compounded
(d) differentially compounded
Ans: c
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55. Following motor is used where high starting torque and wide speed range control is required.
(a) Single phase capacitor start
(b) Induction motor
(c) Synchronous motor
(d) D.C. motor
Ans: d
56. As -the load is increased the speed of D.C. shunt motor will
(a) reduce slightly
(b) increase slightly
(c) increase proportionately
(d) remains unchanged
Ans: a
57. The armature torque of the D.C. shunt motor is proportional to
(a) field flux only
(b) armature current only
(c) both (a) and (b)
(d) none of the above
Ans: b
58. Which of the following method of speed control of D.C. machine will offer minimum efficiency?
(a) Voltage control method
(b) Field control method
(c) Armature control method
(d) All above methods
Ans: c
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59. Usually wide and sensitive speed control is desired in case of
(a) centrifugal pumps
(b) elevators
(c) steel rolling mills
(d) colliery winders
Ans: d
60. The speed of a motor falls from 1100 r.p.m. at no-load to
1050 r.p.m. at rated load. The speed regulation of the motor is
(a) 2.36%
(b) 4.76%
(c) 6.77%
(d) 8.84%
Ans: b
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