Question is ⇒ Which D.C. motor has got maximum self loading property?, Options are ⇒ (A) Series motor, (B) Shunt motor, (C) Cumulatively compounded motor, (D) Differentially compotinded motor, (E) , Leave your comments or Download question paper.

Question is ⇒ Which D.C. motor has got maximum self loading property?, Options are ⇒ (A) Series motor, (B) Shunt motor, (C) Cumulatively compounded motor, (D) Differentially compotinded motor, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Which D.C. motor has got maximum self loading property?
A.	Series motor [Wrong Answer]
B.	Shunt motor [Wrong Answer]
C.	Cumulatively compounded motor [Wrong Answer]
D.	Differentially compotinded motor [Correct Answer]
View Answer 57 -50 Explanation:- Answer : D 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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⇒ The retardation test is applicable to shunt motors and generators and is used to find
the copper losses
the stray losses
the friction losses
the eddy current losses

⇒ For starting a D.C. motor a starter is required because
it limits the speed of the motor
it limits the starting current to a safe value
it starts the motor
none of the above

⇒ Which of the following loss in a D.C. generator is dissipated in the form of heat ?
Mechanical loss
Core loss
Copper loss
All of the above

⇒ A direct on line starter is used for starting motors
up to 5 H.P.
up to 10 H.P.
up to 15 H.P.
up to 20 H.P.

⇒ 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

⇒ Torque developed by a D.C. motor depends upon
active length of the conductor
current flow through the conductors
number of conductors
radius of armature

⇒ No-load speed of which of the following motor will be highest ?
Shunt motor
Series motor
Cumulative compound motor
Differentiate compound motor

⇒ Which of the following loss in a D.C. generator varies significantly with the load current ?
Field copper loss
Windage loss
Armature copper loss
None of the above

⇒ For which types of D.C. motor, dynamic braking is generally used ?
Shunt motors
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⇒ The direction of rotation of a D.C. series motor can be changed by
interchanging supply terminals
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either of (a) and (b) above
None of the above

⇒ In Ward-Leonard control the lower limit of speed is imposed by
residual magnetism of the generator
core losses of motor
mechanical losses of motor and generator together
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control the flux
limit the armature current
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500 W
1000 W
1500 W

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

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

⇒ If conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
less than 50%
60 to 70%
80 to 90%
1

⇒ A shearing machine has cyclic load consisting of intermittent light and henry loads. Which of the following D.C. motor will be suitable for this purpose?
Series motor
Shunt motor
Cumulative compound motor
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⇒ D.C. series machine has field consisting of
many number of turns of thick wire
many number of turns of thin wire
few number of turns of thick wire
few number of turns of thin wire

⇒ If a D.C. motor is connected across the A.C. supply it will
run at normal speed
not run
run at lower Speed
burn due to heat produced in the field winding by eddy currents

⇒ The purpose of retardation test on D.C. shunt machines is to find out
stray losses
eddy current losses
field copper losses
windage losses

⇒ Which of the following methods is most effective in finding out the no load losses in a large D.C. shunt motor ?
Field's test
Ward-Leonard test
Block rotor test
Swinburne's test

⇒ 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

⇒ Hopkinson's test on D.C. machines is conducted at
no-load
part load
full-load
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⇒ Speed control by Ward Leonard method gives uniform speed variation
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above normal speed only

⇒ D.C. shunt motors are used for driving
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cranes
hoists
machine tools

⇒ 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

⇒ Which of the following motor has the poorest speed regulation ?
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Series motor
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Cumulative compound motor

⇒ The maximum end-play of a motor is about
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2 mm
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⇒ Following motor is used where high starting torque and wide speed range control is required.
Single phase capacitor start
Induction motor
Synchronous motor
D.C. motor

⇒ A series motor is' best suited for driving
machine tools
cranes and hoists
shear and punches
none of the above