Question is ⇒ Which of the following motors, on removal of load, will run at the highest speed ?, Options are ⇒ (A) Shunt motor, (B) Series motor, (C) Differential compound, (D) Cumulative compound, (E) , Leave your comments or Download question paper.

Question is ⇒ Which of the following motors, on removal of load, will run at the highest speed ?, Options are ⇒ (A) Shunt motor, (B) Series motor, (C) Differential compound, (D) Cumulative compound, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Which of the following motors, on removal of load, will run at the highest speed ?
A.	Shunt motor [Wrong Answer]
B.	Series motor [Correct Answer]
C.	Differential compound [Wrong Answer]
D.	Cumulative compound [Wrong Answer]
View Answer 5 -4 Explanation:- Answer : B 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 D.C. motor will be suitable alongwith flywheel for intermittent light and heavy loads?
Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor

⇒ The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is
4.0
2.0
1.0
0.5

⇒ When the armature of a D.C. motor rotates, e.m.f. induced is
self-induced e.m.f.
mutually induced e.m.f.
back e.m.f.
none of the above

⇒ In a differentially compounded D.C. motor, if shunt field suddenly opens
the motor will first stop and then run in opposite direction as series motor
the motor will work as series motor and run at slow speed in the same direction
the motor will work as series motor and run at high speed in the same direction
the motor will not work and come to stop

⇒ When the speed of a D.C. motor increases
back e.m.f. increases and current drawn decreases
back e.m.f. as well as current drawn both increase
back e.m.f. as well as current drawn both decrease
back e.m.f. decreases and current drawn increases

⇒ The speed of a D.C. series motor is
proportional to the armature current
proportional to the square of the armature current
proportional to field current
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all of the above

⇒ The plugging gives the
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none of the above

⇒ The power mentioned on the name plate of an electric motor indicates
the power drawn in kW
the power drawn in kVA
the gross power
the output power available at the shaft

⇒ Which D.C. motor will be preferred for cónstant speed line shafting ?
Cumulative compound motor
Differentially compound motor
Shunt motor
Series motor

⇒ Which of the following motors is most suitable for signalling devices and many kinds of timers ?
D.C. shunt motor
D.C. series motor
Induction motor
Reluctance motor

⇒ The variable resistor shunting the field of a D.C. series motor is called a
armature divertor
voltage regulator
field divertor
potential divider

⇒ Which of the following losses are significantly reduced by laminating the core of a D.C. generator ?
Hysteresis losses
Eddy current losses
Copper losses
Windage losses

⇒ Why are the D.C. motors preferred for traction applications ?
Torque and speed are inversely proportional to armature current
Torque is proportional to armature current
Torque is proportional to square root of armature current
The speed is inversely proportional to the torque and the torque is proportional to square of armature current

⇒ Which of the following methods is most ecoriomical fol. finding the no-load losses of a large b.C. shunt motor ?
Retardation test
Swinburne's test
Hopkinson's test
none of the above

⇒ Regenerative braking on D.C. shunt motors is used when
the load has overhauling characteristics
the load is variable
the load also acts as a braking force
the load is constantly decreasing

⇒ In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
remain unchanged
reduce to one-fourth value
increase four folds
be doubled

⇒ The speed regulation of a D.C. motor is

lowest speed

highest speed

highest speed - lowest speed

average speed

no-load speed - full-load speed

full-load speed

no-load speed - full-load speed

no-load speed

⇒ Three point starter can be used for
series motor only
shunt motor only
compound motor only
both shunt and compound motor

⇒ Which of the following motors have almost constant speed over their full load range ?
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D.C. series motors
D.C. shunt motors
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⇒ In D.C. machines fractional pitch winding is used
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to reduce copper losses
to increase the generated e.m.f.
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⇒ The function of a field regulator for compound motors is to
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⇒ Which D.C. motor Will have least percentage increase of input current for the same percentage increase in the torque?
Shunt motor
Series motor
Cumulative compound motor
Separately excited motor

⇒ Which motor should be used for centrifugal pumps ?
Series motor
Shunt motor
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⇒ Which of the following motor is preferred for operation in highly explosive atmosphere ?
Series motor
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⇒ While starting a differential compound motor, it is best to short the series field in order to avoid
excessive starting period
motor starting in wrong direction
tripping of the circuit breaker
large in rush of current

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back e.m.f. = 2 x supply voltage
back e.m.f. = 1/2 x supply voltage
supply voltage = 1/2 x back e.m.f.
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variable speed motors
high speed motors
open frame type motors.

⇒ During rheostatic braking the braking torque is proportional to
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(speed)²
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