Hi friends, this post is about objectives of synchronous machine. Mcq's on synchronous machines which are asked recently in various competitive exams like Gate , Upsc exams and so on. check out and comment if you have any doubts regarding this bits..
1) Synchronous motors generally have
A) salient pole rotor
B) smooth cylindrical rotor
C) either salient pole or smooth cylindrical rotor
D) none of the above
Ans:A
2) Number of slip rings in a 3-phase synchronous motor will be
A) 0
B) 1
C) 2
D) 3 or 4
Ans:C
3) A 3-phase synchronous motor has
A) high starting torque
B) no starting torque
C) low starting current
D) low starting torque
Ans:B
4) A 3-phase synchronous motor needs dc supply for excitation
A) continously
B) at the starting instant only
C) of stator
D) none of these
Ans:A
5) In a 3-phase synchronous motor the magnitude of field flux
A) remains constant at all loads
B) varies with load
C) varies with speed
D) varies with power factor
Ans:A
6) The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for
A) a dc machine
B) an induction machine
C) a synchronous machine
D) all of the above machine
Ans:D
7) What is the angle between the induced voltage and supply voltage of a synchronous motor under running condition
A) Zero
B) Greater than zero but ≤ 90°
C) Between 90° and 180°
D) > 180
Ans:C
8) The value of load angle for a synchronous motor depends mainly upon its
A) excitation
B) load
C) speed
D) supply voltage
Ans:B
9) The armature current of a synchronous motor on no load
A) leads the applied voltage by 90°
B) lags behind the applied voltage by 90°
C) is in phase with applied voltage
D) zero
Ans:A
10) The coupling magnetic field reaction with ............... system is essential for extracting energy from an electrical system
A) mechanical
B) electrical
C) both electrical and mechanical
Ans:B
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1) Synchronous motors generally have
A) salient pole rotor
B) smooth cylindrical rotor
C) either salient pole or smooth cylindrical rotor
D) none of the above
Ans:A
2) Number of slip rings in a 3-phase synchronous motor will be
A) 0
B) 1
C) 2
D) 3 or 4
Ans:C
3) A 3-phase synchronous motor has
A) high starting torque
B) no starting torque
C) low starting current
D) low starting torque
Ans:B
4) A 3-phase synchronous motor needs dc supply for excitation
A) continously
B) at the starting instant only
C) of stator
D) none of these
Ans:A
5) In a 3-phase synchronous motor the magnitude of field flux
A) remains constant at all loads
B) varies with load
C) varies with speed
D) varies with power factor
Ans:A
6) The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for
A) a dc machine
B) an induction machine
C) a synchronous machine
D) all of the above machine
Ans:D
7) What is the angle between the induced voltage and supply voltage of a synchronous motor under running condition
A) Zero
B) Greater than zero but ≤ 90°
C) Between 90° and 180°
D) > 180
Ans:C
8) The value of load angle for a synchronous motor depends mainly upon its
A) excitation
B) load
C) speed
D) supply voltage
Ans:B
9) The armature current of a synchronous motor on no load
A) leads the applied voltage by 90°
B) lags behind the applied voltage by 90°
C) is in phase with applied voltage
D) zero
Ans:A
10) The coupling magnetic field reaction with ............... system is essential for extracting energy from an electrical system
A) mechanical
B) electrical
C) both electrical and mechanical
Ans:B
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1 comments:
Write commentsThanks sir very effective questions
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