1) The magnitude of the resultant flux in two phase supply system is equal to: A. В. Pm C. Pm D. m E. 34 2) The power input to the rotor of a 400 V, 50.Hz, 6-pole, 3-phase induction motor is 20 kW. The slip is 3%. The rotor copper losses will be: A. 600 W B. 666.66 W С. 60 W D. 6000 W E. 66 W 3) A 12 - pole, 3-phase alternator driven at a speed of 500 r.p.m. supplies power to an 8-pole 3-phase induction motor. If the slip of the motor, at full-load is 3%, the full-load speed of the motor is: A. 727.5 В. 827.5 C. 888.5 D. 626.5 E. 226.5 4) It is advisable to avoid line-starting of induction motor and use starter because: A. motor takes five to seven times its full load current B. it will pick-up very high speed and may go out of step C. it will run in reverse direction D. starting torque is very high E. starting speed is very high 5) In a three-phase induction motor, the number of poles in the rotor winding is always: A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator E. two 6) DOL starting of induction motors is usually restricted to: A. low horsepower motors B. variable speed motors C. high horsepower motors D. high speed motors A. variable torque motors 1 7) Short-circuit test on an induction motor cannot be used to determine: A. windage losses B. copper losses C. transformation ratio D. power scale of circle diagram E. All above 8) The shape of the torque/slip curve of induction motor is: A. parabola B. hyperbola C. rectangular parabola D. straigth line E. rectangular 9) A brushless exciter used when the synchronous machine is: A. Small B. Large C. Medium D. Very small E. All above 10) If the capacitor of a single-phase motor is short-circuited: A. the motor will not start B. the motor will run C. the motor will run in reverse direction D. the motor will run in the same direction at reduced r.p.m. E. All above 11) A centrifugal switch is used to dis- connect 'starting winding when motor has: A. run for about 1 minute B. run for about 5 minutes C. picked up about 50 to 70 per cent of rated speed D. picked up about 10 to 25 per cent of rated speed E. picked up about 0 to 10 per cent of rated speed 12)If starting winding of a single-phase induction motor is left in the circuit, it will: A. run faster B. spark at light loads C. draw excessive current and overheat D. run slower E. spark at rated loads 13)The capacitors used in single-phase capacitor motors have no: A. voltage rating B. dielectric medium C. polarity marking D. definite value E. All above
1) The magnitude of the resultant flux in two phase supply system is equal to: A. В. Pm C. Pm D. m E. 34 2) The power input to the rotor of a 400 V, 50.Hz, 6-pole, 3-phase induction motor is 20 kW. The slip is 3%. The rotor copper losses will be: A. 600 W B. 666.66 W С. 60 W D. 6000 W E. 66 W 3) A 12 - pole, 3-phase alternator driven at a speed of 500 r.p.m. supplies power to an 8-pole 3-phase induction motor. If the slip of the motor, at full-load is 3%, the full-load speed of the motor is: A. 727.5 В. 827.5 C. 888.5 D. 626.5 E. 226.5 4) It is advisable to avoid line-starting of induction motor and use starter because: A. motor takes five to seven times its full load current B. it will pick-up very high speed and may go out of step C. it will run in reverse direction D. starting torque is very high E. starting speed is very high 5) In a three-phase induction motor, the number of poles in the rotor winding is always: A. zero B. more than the number of poles in stator C. less than number of poles in stator D. equal to number of poles in stator E. two 6) DOL starting of induction motors is usually restricted to: A. low horsepower motors B. variable speed motors C. high horsepower motors D. high speed motors A. variable torque motors 1 7) Short-circuit test on an induction motor cannot be used to determine: A. windage losses B. copper losses C. transformation ratio D. power scale of circle diagram E. All above 8) The shape of the torque/slip curve of induction motor is: A. parabola B. hyperbola C. rectangular parabola D. straigth line E. rectangular 9) A brushless exciter used when the synchronous machine is: A. Small B. Large C. Medium D. Very small E. All above 10) If the capacitor of a single-phase motor is short-circuited: A. the motor will not start B. the motor will run C. the motor will run in reverse direction D. the motor will run in the same direction at reduced r.p.m. E. All above 11) A centrifugal switch is used to dis- connect 'starting winding when motor has: A. run for about 1 minute B. run for about 5 minutes C. picked up about 50 to 70 per cent of rated speed D. picked up about 10 to 25 per cent of rated speed E. picked up about 0 to 10 per cent of rated speed 12)If starting winding of a single-phase induction motor is left in the circuit, it will: A. run faster B. spark at light loads C. draw excessive current and overheat D. run slower E. spark at rated loads 13)The capacitors used in single-phase capacitor motors have no: A. voltage rating B. dielectric medium C. polarity marking D. definite value E. All above
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
Related questions
Question
![1) The magnitude of the resultant flux in two phase supply system is equal to:
A.
Pm
B. Pm
.
Pm
C.
D. Фи
E. 30m
2) The power input to the rotor of a 400 V, 50.Hz, 6-pole, 3-phase induction motor is 20 kW. The
slip is 3%. The rotor copper losses will be:
A. 600 W
B. 666.66 W
C. 60 W
D. 6000 W
E. 66 W
3) A 12 - pole, 3-phase alternator driven at a speed of 500 r.p.m. supplies power to an 8-pole 3-phase
2
induction motor. If the slip of the motor, at full-load is 3%, the full-load speed of the motor is:
A. 727.5
B. 827.5
C. 888.5
D. 626.5
E. 226.5
4) It is advisable to avoid line-starting of induction motor and use starter because:
A. motor takes five to seven times its full load current
B. it will pick-up very high speed and may go out of step
C. it will run in reverse direction
D. starting torque is very high
E. starting speed is very high
5) In a three-phase induction motor, the number of poles in the rotor winding is always:
A. zero
B. more than the number of poles
C. less than number of poles in stator
D. equal to number of poles in stator
E. two
6) DOL starting of induction motors is usually restricted to:
A. low horsepower motors
B. variable speed motors
C. high horsepower motors
D. high speed motors
A. variable torque motors
in stator
1
7) Short-circuit test on an induction motor cannot be used to determine:
A. windage losses
B. copper losses
C. transformation ratio
D. power scale of circle diagram
E. All above
8) The shape of the torque/slip curve of induction motor is:
A. parabola
B. hyperbola
C. rectangular parabola
D. straigth line
E. rectangular
9) A brushless exciter used when the synchronous machine is:
A. Small
B. Large
C. Medium
D. Very small
E. All above
10) If the capacitor of a single-phase motor is short-circuited:
A. the motor will not start
B. the motor will run
C. the motor will run in reverse direction
D. the motor will run in the same direction at reduced r.p.m.
E. All above
11) A centrifugal switch is used to dis- connect 'starting winding when motor has:
A. run for about 1 minute
B. run for about 5 minutes
C. picked up about 50 to 70 per cent of rated speed
D. picked up about 10 to 25 per cent of rated speed
E. picked up about 0 to 10 per cent of rated speed
12)If starting winding of a single-phase induction motor is left in the circuit, it will:
A. run faster
B. spark at light loads
C. draw excessive current and overheat
D. run slower
E. spark at rated loads
13)The capacitors used in single-phase capacitor motors have no:
A. voltage rating
B. dielectric medium
C. polarity marking
D. definite value
E. All above](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7c37c391-e1f8-4d97-bd22-db6f36ba33e8%2Fa9adfc04-ff12-4635-af7f-ea01b3aec3e0%2Ffwykm7o_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1) The magnitude of the resultant flux in two phase supply system is equal to:
A.
Pm
B. Pm
.
Pm
C.
D. Фи
E. 30m
2) The power input to the rotor of a 400 V, 50.Hz, 6-pole, 3-phase induction motor is 20 kW. The
slip is 3%. The rotor copper losses will be:
A. 600 W
B. 666.66 W
C. 60 W
D. 6000 W
E. 66 W
3) A 12 - pole, 3-phase alternator driven at a speed of 500 r.p.m. supplies power to an 8-pole 3-phase
2
induction motor. If the slip of the motor, at full-load is 3%, the full-load speed of the motor is:
A. 727.5
B. 827.5
C. 888.5
D. 626.5
E. 226.5
4) It is advisable to avoid line-starting of induction motor and use starter because:
A. motor takes five to seven times its full load current
B. it will pick-up very high speed and may go out of step
C. it will run in reverse direction
D. starting torque is very high
E. starting speed is very high
5) In a three-phase induction motor, the number of poles in the rotor winding is always:
A. zero
B. more than the number of poles
C. less than number of poles in stator
D. equal to number of poles in stator
E. two
6) DOL starting of induction motors is usually restricted to:
A. low horsepower motors
B. variable speed motors
C. high horsepower motors
D. high speed motors
A. variable torque motors
in stator
1
7) Short-circuit test on an induction motor cannot be used to determine:
A. windage losses
B. copper losses
C. transformation ratio
D. power scale of circle diagram
E. All above
8) The shape of the torque/slip curve of induction motor is:
A. parabola
B. hyperbola
C. rectangular parabola
D. straigth line
E. rectangular
9) A brushless exciter used when the synchronous machine is:
A. Small
B. Large
C. Medium
D. Very small
E. All above
10) If the capacitor of a single-phase motor is short-circuited:
A. the motor will not start
B. the motor will run
C. the motor will run in reverse direction
D. the motor will run in the same direction at reduced r.p.m.
E. All above
11) A centrifugal switch is used to dis- connect 'starting winding when motor has:
A. run for about 1 minute
B. run for about 5 minutes
C. picked up about 50 to 70 per cent of rated speed
D. picked up about 10 to 25 per cent of rated speed
E. picked up about 0 to 10 per cent of rated speed
12)If starting winding of a single-phase induction motor is left in the circuit, it will:
A. run faster
B. spark at light loads
C. draw excessive current and overheat
D. run slower
E. spark at rated loads
13)The capacitors used in single-phase capacitor motors have no:
A. voltage rating
B. dielectric medium
C. polarity marking
D. definite value
E. All above
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