Electrical Machine - I (3140913) MCQs

MCQs of DC Machines

Showing 61 to 70 out of 167 Questions
4 5 6 7 8 9
61.
Armature resistance control method is used for the _______ ?
(a) above rated speed
(b) below rated speed
(c) both 1 and 2
(d) none of the above
Answer:

Option (b)

62.
Armature reaction effect is more in which of the following speed control methods?
(a) field weakening method
(b) armature resistance control
(c) same in both methods
(d) none of the above
Answer:

Option (a)

63.
Field weakening method is also called as _________?
(a) constant torque control
(b) constant power control
(c) constant voltage control
(d) constant current control
Answer:

Option (b)

64.
The armature resistance control method is also called as __________ ?
(a) constant torque control
(b) constant power control
(c) constant voltage control
(d) constant current control
Answer:

Option (a)

65.
If the terminal voltage of one 1000 rpm shunt motor is reduced to half, the speed of the motor will be _____________
(a) 250
(b) 500
(c) 1000
(d) 2000
Answer:

Option (c)

66.
Diverters are used only in DC __________ motor for speed control.
(a) shunt
(b) series
(c) either of these
(d) none of the above
Answer:

Option (b)

67.
Which of the following starter is sufficient to start the DC series motor?
(a) 3 point starter
(b) 4 point starter
(c) 2 point starter
(d) all of the above
Answer:

Option (c)

68.
Total core loss is also called as __________ .
(a) Copper loss
(b) Magnetic loss
(c) Friction Loss and Windage loss
(d) None of the above
Answer:

Option (b)

69.
Which of the following are variable losses?
(a) eddy current loss
(b) hysteresis loss
(c) shunt field copper loss
(d) armature copper loss
Answer:

Option (d)

70.
Swinburne test is conducted under which of the following condition?
(a) no load
(b) full load
(c) half load
(d) any of the above
Answer:

Option (a)

Showing 61 to 70 out of 167 Questions
4 5 6 7 8 9