Hi friends, check out objectives of electrical engineering with emphasis on induction motor check out and comment here..
1) In a 3-phase slip ring induction motor, brushes are connected to
A) external star-connected resistors
B) dc supply
C) 3-phase ac supply
D) equalizing coils
Ans:A
2) In an induction motor, the air gap flux density is usually kept low so as to
A) improve efficiency
B) improve power factor
C) reduce machine cost
D) none of the above
Ans:B
3) The squirrel cage rotor of a 6-pole induction motor can be used for................induction motor.
A) Only 6-pole
B) 6 or 12-pole
C) any number of poles in an
D) none of above
Ans:C
4) In an induction motor, if the airgap is increased
A) its speed will reduced
B) its efficiency will improve
C) its power factor will reduce
D) its break down torque will reduce
Ans:C
5) The rotor slots are slightly skewed in squirrel cage induction motor to
A) increase the strength of rotor bars
B) reduce the magnetic hum and locking tendency of rotor
C) economise on the copper to be used
D) provide ease of fabrication
Ans:B
6) The rotor of a 3-phase wound rotor induction motor is provided with
A) single-phase winding
B) three phase winding
C) heavy copper or aluminium bars placed in rotor slots
D) heavy short-circuited end rings
Ans:B
7) A wound rotor induction motor can be distinguished from squirrel cage induction motor by
A) presence of slip rings
B) size of frame
C) shaft diameter
D) any of the above
Ans:A
8) A 3-phase, 4-pole squirrel cage induction motor has 36 stator and 28 rotor slots. The number of phases in the rotor is
A) 3
B) 9
C) 7
D) 8
Ans:A
9) The squirrel cage induction motors are provided with blades in order to
A) facilitate cooling of rotor
B) balance of rotor dynamically
C) eliminate noise
D) none of these
Ans:A
10) The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in
A) delta
B) star
C) delta or star according to need
D) none of the above
Ans:B
If you like my post please share with your friends and if you have doubts please comment here...
1) In a 3-phase slip ring induction motor, brushes are connected to
A) external star-connected resistors
B) dc supply
C) 3-phase ac supply
D) equalizing coils
Ans:A
2) In an induction motor, the air gap flux density is usually kept low so as to
A) improve efficiency
B) improve power factor
C) reduce machine cost
D) none of the above
Ans:B
3) The squirrel cage rotor of a 6-pole induction motor can be used for................induction motor.
A) Only 6-pole
B) 6 or 12-pole
C) any number of poles in an
D) none of above
Ans:C
4) In an induction motor, if the airgap is increased
A) its speed will reduced
B) its efficiency will improve
C) its power factor will reduce
D) its break down torque will reduce
Ans:C
5) The rotor slots are slightly skewed in squirrel cage induction motor to
A) increase the strength of rotor bars
B) reduce the magnetic hum and locking tendency of rotor
C) economise on the copper to be used
D) provide ease of fabrication
Ans:B
6) The rotor of a 3-phase wound rotor induction motor is provided with
A) single-phase winding
B) three phase winding
C) heavy copper or aluminium bars placed in rotor slots
D) heavy short-circuited end rings
Ans:B
7) A wound rotor induction motor can be distinguished from squirrel cage induction motor by
A) presence of slip rings
B) size of frame
C) shaft diameter
D) any of the above
Ans:A
8) A 3-phase, 4-pole squirrel cage induction motor has 36 stator and 28 rotor slots. The number of phases in the rotor is
A) 3
B) 9
C) 7
D) 8
Ans:A
9) The squirrel cage induction motors are provided with blades in order to
A) facilitate cooling of rotor
B) balance of rotor dynamically
C) eliminate noise
D) none of these
Ans:A
10) The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in
A) delta
B) star
C) delta or star according to need
D) none of the above
Ans:B
If you like my post please share with your friends and if you have doubts please comment here...
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