Question is ⇒ If a D.C. motor is to be selected for conveyors, which motor would be preferred ?, Options are ⇒ (A) Series motor, (B) Shunt motor, (C) Differentially compound motor, (D) Cumulative compound motor, (E) , Leave your comments or Download question paper.

Question is ⇒ If a D.C. motor is to be selected for conveyors, which motor would be preferred ?, Options are ⇒ (A) Series motor, (B) Shunt motor, (C) Differentially compound motor, (D) Cumulative compound motor, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
A.	Series motor [Correct Answer]
B.	Shunt motor [Wrong Answer]
C.	Differentially compound motor [Wrong Answer]
D.	Cumulative compound motor [Wrong Answer]
View Answer 5 -2 Explanation:- Answer : A 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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⇒ For constant torque drive which speed control method is preferred ?
Field control
Armature voltage control
Shunt armature control
Mechanical loading system

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

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

⇒ In a motor, energy conversion would not have been possible but for the
production of opposing back e.m.f. Eb in the armature
input energy from supply
use of commutator
application of Fleming's left-hand rule

⇒ 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

⇒ In D.C. shunt motors as load is reduced
the speed will increase abruptly
the speed will increase in proportion to reduction in load
the speed will remain almost constant
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⇒ Which of the following motor is preferred for operation in highly explosive atmosphere ?
Series motor
Shunt motor
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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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⇒ In a D.C. motor constant torque is produced due to
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⇒ A face plate starter is employed for starting
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universal motor
synchronous motor
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⇒ If the field circuit of a loaded shunt motor is suddenly opened
torque developed by the motor would be reduced to zero
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it would draw abnormally high armature current
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1 : 8
1 : 6
1 : 4

⇒ 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

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reduce slightly
increase slightly
increase proportionately -
remains unchanged

⇒ If the speed of a D.C. shunt motor is increased the back e.m.f. of the motor will
decrease
increase
remain same
become zero

⇒ 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

⇒ Which of the following statement is incorrect ? If a starter is not used with large D.C. motor, it will draw a starting current which
will produce very low starting torque
will produce excessive line voltage drop
will damage the cOmmutator
is many times its full-load current

⇒ Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
Lenz's law
Faraday's law
Coloumb's law
Fleming's left-hand rule

⇒ In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be
almost negligible
rated full-load current
less than full-load current
more than full-load current

⇒ Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?
Low cost
Wide speed range
Stability
High starting torque

⇒ A 230 V D.C. shlint motor takes 32 A at full load. The back e.m.f. on full load, if the resistance of motor armature and shunt field windings are 0.2 Ω and 115 Ω respectively, will be
210 V
215 V
220 V
224 V

⇒ 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

⇒ All motors, basically, operate on the principie of either repulsion or
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semi-conduction
capacitance
electro-magnetism

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excessive starting period
motor starting in wrong direction
tripping of the circuit breaker
large in rush of current

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

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

⇒ When two D.C. series motors are connected in parallel, the resultant speed is
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loss than the normal speed
normal speed
zero

⇒ The mechanical power developed by a D.C. motor is equal to
power input + losses
back e.m.f. X armature current
power output X losses
power output X efficiency

⇒ Which of the following loss of D.C. motor decreases with increase in load ?
Friction and windage loss
Core loss
Brush contact loss
none of the above

⇒ In which of the following applications D.C. series motor is invariably tried?
Starter for a car
Drive for a water pump
Fan motor
Motor operation in A.C. or D.C.