Question is ⇒ The rated speed of a given D.C. shunt motor is 900 r.p.m. To run this machine at 1000 r.p.m., which of the following speed control scheme will be used ?, Options are ⇒ (A) Ward-leonard control, (B) Armature current resistance control, (C) Field resistance control, (D) None of the above, (E) , Leave your comments or Download question paper.

Question is ⇒ The rated speed of a given D.C. shunt motor is 900 r.p.m. To run this machine at 1000 r.p.m., which of the following speed control scheme will be used ?, Options are ⇒ (A) Ward-leonard control, (B) Armature current resistance control, (C) Field resistance control, (D) None of the above, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The rated speed of a given D.C. shunt motor is 900 r.p.m. To run this machine at 1000 r.p.m., which of the following speed control scheme will be used ?
A.	Ward-leonard control [Wrong Answer]
B.	Armature current resistance control [Wrong Answer]
C.	Field resistance control [Correct Answer]
D.	None of the above [Wrong Answer]
View Answer 5 -3 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Which of the following tests can be used to determine no-load losses in a D.C. shunt motor ?
Running down test
Swinburne's test
Field test
Brake test

⇒ The plugging gives the
zero torque braking
smallest torque braking
highest torque braking
none of the above

⇒ One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven
runs as a generator
does not run as a generator
also runs as a motor
comes to stop after sometime

⇒ Sparking is discouraged in a D.C. motor because
it increases the input power consumption
commutator gets damaged
both (a) and (b)
none of the above

⇒ Which of the following motors is usually used in house-hold refrigerators ?
D.C. shunt motor
D.C. series motor
Single phase induction motor (split phase start or induction run motor)
Reluctance motor

⇒ As compared to an induction motor, the air gap in a D.C. motor is
less than 50%
between 50% and 90%
same
more

⇒ Which D.C. motor has got maximum self relieving property ?
Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor

⇒ A D.C. series motor is that which
has its field winding consisting of thick wire and less turns
has a poor torque
can be started easily without load
has almost constant speed

⇒ A wide and very sensitive speed control is usually required in case of
elevators
steel rolling mills
colliery winders
all of the above

⇒ In a D.C. motor, the ratio Eb/Va indicates
running torque of the motor
starting torque of the motor
efficiency of the motor
speed regulation of the motor

⇒ The maximum end-play of a motor is about
10 mm
6 mm
2 mm
0.4 mm