Question is ⇒ In Field's test for series motors one motor drives the other machine as, Options are ⇒ (A) cumulative compound generator, (B) differential compound generator, (C) separately excited generator, (D) series generator, (E) , Leave your comments or Download question paper.

Question is ⇒ In Field's test for series motors one motor drives the other machine as, Options are ⇒ (A) cumulative compound generator, (B) differential compound generator, (C) separately excited generator, (D) series generator, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	In Field's test for series motors one motor drives the other machine as
A.	cumulative compound generator [Wrong Answer]
B.	differential compound generator [Wrong Answer]
C.	separately excited generator [Correct Answer]
D.	series generator [Wrong Answer]
View Answer 6 -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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⇒ A D.C. motor can be easily identified by
winding
commutator
size of conductor
yoke

⇒ 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 ?
Ward-leonard control
Armature current resistance control
Field resistance control
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

⇒ 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

⇒ In a D.C. motor if the back e.m.f. is absent
motor will burn
motor will not run at all
motor will run at very slow speed
motor will run at very high speed

⇒ In a D.C. motor constant torque is produced due to
rotor laminations
end-plates
pole shoes
commutator

⇒ As there is no back e.m.f. at the instant of starting, a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit
a resistance is connected in series with armature
a resistance is connected parallel to the armature
armature is temporarily open circuited
a high value resistor is connected across the field winding

⇒ Which motor has the poorest speed control?
Differentially compounded motor
Cumulatively compounded motor
Shunt motor
Series motor

⇒ 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
inversely proportional to the armature current

⇒ In Ward Leonard method of speed control of a D.C. motor, change in speed of motor is obtained by the
change in armature voltage of D.C. motor
change in the field excitation of the D.C. motor
change in armature current of D.C. motor
change in supply voltage

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

⇒ At the instant of starting when a D.C. motor is put on supply, it behaves like
a highly resistive circuit
a low resistance circuit
a capacitive circuit
none of the above

⇒ Which of the following can be used for controlling the speed of a D.C. motor ?
Thermistor
Transistor
Thyratron
Thyristor

⇒ Four point starter in the D.C. motor is used
to decrease the field current
to increase the field current
not to effect the current passing through Hold on coil even if any change M the field current takes place
all of the above

⇒ According to Fleming's left hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of
current, in the conductor
movement of conductor
resultant force on conductor
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⇒ The type of D.C. motor used for shears and punches is
shunt motor.
series motor
differential compound D.C. motor
cumulative compound D.C. 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 motor is used in the locomotives motor drives ?
D.C. series motor
A.C. series motor
Synchronous motor
Induction motor

⇒ Hopkinson's test is conducted at
no load
part load
low load
full load

⇒ 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

⇒ These days D.C. motors are widely used in
pumping sets
air compressors
electric traction
machine shops

⇒ In electric motors carbon brushes are used to
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prevent sparking during commutation
prevent overheating of armature windings
brush off carbon deposits on the commutator

⇒ By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
Frame
Shaft
Commutator
Stator

⇒ The series parallel system of speed control of D.C. series motors widely used in traction work gives a speed range of about
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1 : 6
1 : 4

⇒ A face plate starter is employed for starting
induction motor
universal motor
synchronous motor
d.c. series motor

⇒ The maximum end-play of a motor is about
10 mm
6 mm
2 mm
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⇒ If a D.C. motor is to be selected for conveyors, which motor would be preferred ?
Series motor
Shunt motor
Differentially compound motor
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⇒ The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is
0.0236
0.0476
0.0677
0.0884

⇒ Which D.C. motor will be suitable alongwith flywheel for intermittent light and heavy loads?
Series motor
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Cumulatively compounded motor
Differentially compounded 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
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Reluctance motor