Question is ⇒ Which of the following motors is usually used in house-hold refrigerators ?, Options are ⇒ (A) D.C. shunt motor, (B) D.C. series motor, (C) Single phase induction motor (split phase start or induction run motor), (D) Reluctance motor, (E) Synchronous motor, Leave your comments or Download question paper.

Question is ⇒ Which of the following motors is usually used in house-hold refrigerators ?, Options are ⇒ (A) D.C. shunt motor, (B) D.C. series motor, (C) Single phase induction motor (split phase start or induction run motor), (D) Reluctance motor, (E) Synchronous motor, Leave your comments or Download question paper. Previous question Next question


Q1.	Which of the following motors is usually used in house-hold refrigerators ?
A.	D.C. shunt motor [Wrong Answer]
B.	D.C. series motor [Wrong Answer]
C.	Single phase induction motor (split phase start or induction run motor) [Correct Answer]
D.	Reluctance motor [Wrong Answer]
E.	Synchronous motor [Wrong Answer]
View Answer 5 -2 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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⇒ A three point starter is considered suitable for
shunt motors
shunt as well as compound motors
shunt, compound and series motors
all D.C. motors

⇒ D.C. generators are normally designed for maximum efficiency around
full-load
rated r.p.m.
rated voltage
all of the above

⇒ Which of the following application requires high starting torque ?
Lathe machine
Centrifugal pump
Locomotive
Air blower

⇒ Field winding of a D.C. series motor is usually provided with thick wire
to provide large flux
to reduce the use of insulating materials
as it carries large load current
in order to reduce eddy current

⇒ Which of the following motors, on removal of load, will run at the highest speed ?
Shunt motor
Series motor
Differential compound
Cumulative compound

⇒ What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
The motor will stop
The motor will continue to run
The armature may burn
The motor will run noisy

⇒ VVhat is the effect produced by the electric current in an electric motor ?
Heating effect only
Magnetic effect only
Heating as well as magnetic effect
Heating as well as chemical effect

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electric current
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500 W
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1500 W

⇒ For constant torque drive which speed control method is preferred ?
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⇒ The variable resistor shunting the field of a D.C. series motor is called a
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voltage regulator
field divertor
potential divider

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directly proportional to the armature current
proportional to the square of the current
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⇒ 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

⇒ The direction of rotation of a D.C. series motor can be changed by
interchanging supply terminals
interchanging field terminals
either of (a) and (b) above
None of the above

⇒ Which of the following motors have almost constant speed over their full load range ?
A.C. series motors
D.C. series motors
D.C. shunt motors
Low resistance squirrel cage motors

⇒ A D.C. motor can be easily identified by
winding
commutator
size of conductor
yoke

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series motor only
shunt motor only
compound motor only
both shunt and compound motor

⇒ D.C. series motors are used
where load is constant
where load changes frequently
where constant operating speed is needed
in none of the above situations.

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

⇒ A wide and very sensitive speed control is usually required in case of
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colliery winders
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⇒ Which of the following motors one will choose to drive the rotary compressor ?
D.C. shunt motor
D.C. series motor
Universal motor
Synchronous motor

⇒ The speed of a series motor at no load is
infinity
4000 r.p.m.
2000 r.p.m.
1000 r.p.m.

⇒ Which of the following tests can be conducted on all types of D.C. machines ?
Hopkinson's test
Running down test
Block rotor test
Field's test

⇒ 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

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I.C. engines
batteries

⇒ Which method of braking is generally used in elevators ?
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Rheostatic braking
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⇒ In Ward Leonard method of speed control of a D.C. motor, change in speed of motor is obtained by the
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change in the field excitation of the D.C. motor
change in armature current of D.C. motor
change in supply voltage

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Low speed operation
High speed operation
Variable speed operation
Fixed speed operation

⇒ For a D.C. shunt motor if the excitation is changed
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torque and power both will change
torque, power and speed, all will change

⇒ If t be the thickness of the laminations, then eddy current loss in a generator. will vary as
¹/_t
¹/_t²
t
t²