Q1. Choose the right option for the following: [... ][Choose 9 only] 1. If a DC voltage is applied to a DC motor, then, according to Fleming's Left hand Rule, the motor will experience that develops a torque which causes the rotation. a. Back EMF (Eb) b. Mechanical force c. Energy d. None of the above 2. The lost torque resulting from the difference (Ta - Tsh) represents_ a. iron loss c. friction loss 3. Ta/la characteristic in series motor is a a. straight line b. curve (parabola) d. if the answer is not existed above, then draw the C/CS 4. Generator is said to be commutatively-compounded when_ a. series field aids the shunt field c. the commutation device is used b. electrical loss d. both a and e a. Overcome Eb c. Supply the armature ohmic drop b. series field opposes the shunt field d. none of the above 5. Thin laminations eliminate the eddy current losses in the armature core, since_ a. it reduce the core resistance b. it increase the core resistance c. it reduce the core weight d. it make the core as a short circuit 6. Hysteresis loss depends upon_ a. the volume and grade of iron c. frequency of magnetic reversals 7. The main purpose of the commutator in a DC Generator is to. a. provide smoother output c. convert the AC to DC 8. The voltage applied across the motor armature has to c. curve (exponential) b. maximum value of flux density Bax d. all the above are true b. Both a and b d. None of the above b. convert the induced DC to AC d. None of the above 9. In cases where huge starting torque is required for accelerating heavy loads, . preferred. a. series DC b. shunt DC c. AC induction d. all the previous 10. If the primary and secondary voltage of a transformer are respectively 220V, 440V, then the Voltage Transformation Ratio is_ a. 0.5 b. 2 c. 220 d. 440 _motors are
Q1. Choose the right option for the following: [... ][Choose 9 only] 1. If a DC voltage is applied to a DC motor, then, according to Fleming's Left hand Rule, the motor will experience that develops a torque which causes the rotation. a. Back EMF (Eb) b. Mechanical force c. Energy d. None of the above 2. The lost torque resulting from the difference (Ta - Tsh) represents_ a. iron loss c. friction loss 3. Ta/la characteristic in series motor is a a. straight line b. curve (parabola) d. if the answer is not existed above, then draw the C/CS 4. Generator is said to be commutatively-compounded when_ a. series field aids the shunt field c. the commutation device is used b. electrical loss d. both a and e a. Overcome Eb c. Supply the armature ohmic drop b. series field opposes the shunt field d. none of the above 5. Thin laminations eliminate the eddy current losses in the armature core, since_ a. it reduce the core resistance b. it increase the core resistance c. it reduce the core weight d. it make the core as a short circuit 6. Hysteresis loss depends upon_ a. the volume and grade of iron c. frequency of magnetic reversals 7. The main purpose of the commutator in a DC Generator is to. a. provide smoother output c. convert the AC to DC 8. The voltage applied across the motor armature has to c. curve (exponential) b. maximum value of flux density Bax d. all the above are true b. Both a and b d. None of the above b. convert the induced DC to AC d. None of the above 9. In cases where huge starting torque is required for accelerating heavy loads, . preferred. a. series DC b. shunt DC c. AC induction d. all the previous 10. If the primary and secondary voltage of a transformer are respectively 220V, 440V, then the Voltage Transformation Ratio is_ a. 0.5 b. 2 c. 220 d. 440 _motors are
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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![Q1. Choose the right option for the following: [..
] [Choose 9 only]
1. If a DC voltage is applied to a DC motor, then, according to Fleming's Left hand Rule, the motor
that develops a torque which causes the rotation.
will experience
a. Back EMF (Eb)
b. Mechanical force
c. Energy
d. None of the above
2. The lost torque resulting from the difference (Ta - Tsh) represents_
a. iron loss
c. friction loss
3. Ta/la characteristic in series motor is a
a. straight line
b. curve (parabola)
d. if the answer is not existed above, then draw the C/CS
4. Generator is said to be commutatively-compounded when_
a. series field aids the shunt field
c. the commutation device is used
b. electrical loss
d. both a and c
b. series field opposes the shunt field
d. none of the above
5. Thin laminations eliminate the eddy current losses in the armature core, since_
a. it reduce the core resistance
b. it increase the core resistance
c. it reduce the core weight
d. it make the core as a short circuit
6. Hysteresis loss depends upon_
a. the volume and grade of iron
c. frequency of magnetic reversals
7. The main purpose of the commutator in a DC Generator is to
c. curve (exponential)
a. provide smoother output
c. convert the AC to DC
8. The voltage applied across the motor armature has to
a. Overcome Eb
c. Supply the armature ohmic drop
b. maximum value of flux density Bax
d. all the above are true
b. Both a and b
d. None of the above
b. convert the induced DC to AC
d. None of the above
9. In cases where huge starting torque is required for accelerating heavy loads,
preferred.
a. series DC b. shunt DC
c. AC induction
d. all the previous
10. If the primary and secondary voltage of a transformer are respectively 220V, 440V, then the
Voltage Transformation Ratio is_
a. 0.5
b. 2
c. 220
d. 440
motors are](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F431728c4-a3d4-4c3d-840c-5db3f0aad743%2F2c1bde29-8ca8-438a-9f7c-91363e93a2f7%2F0n6oy_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q1. Choose the right option for the following: [..
] [Choose 9 only]
1. If a DC voltage is applied to a DC motor, then, according to Fleming's Left hand Rule, the motor
that develops a torque which causes the rotation.
will experience
a. Back EMF (Eb)
b. Mechanical force
c. Energy
d. None of the above
2. The lost torque resulting from the difference (Ta - Tsh) represents_
a. iron loss
c. friction loss
3. Ta/la characteristic in series motor is a
a. straight line
b. curve (parabola)
d. if the answer is not existed above, then draw the C/CS
4. Generator is said to be commutatively-compounded when_
a. series field aids the shunt field
c. the commutation device is used
b. electrical loss
d. both a and c
b. series field opposes the shunt field
d. none of the above
5. Thin laminations eliminate the eddy current losses in the armature core, since_
a. it reduce the core resistance
b. it increase the core resistance
c. it reduce the core weight
d. it make the core as a short circuit
6. Hysteresis loss depends upon_
a. the volume and grade of iron
c. frequency of magnetic reversals
7. The main purpose of the commutator in a DC Generator is to
c. curve (exponential)
a. provide smoother output
c. convert the AC to DC
8. The voltage applied across the motor armature has to
a. Overcome Eb
c. Supply the armature ohmic drop
b. maximum value of flux density Bax
d. all the above are true
b. Both a and b
d. None of the above
b. convert the induced DC to AC
d. None of the above
9. In cases where huge starting torque is required for accelerating heavy loads,
preferred.
a. series DC b. shunt DC
c. AC induction
d. all the previous
10. If the primary and secondary voltage of a transformer are respectively 220V, 440V, then the
Voltage Transformation Ratio is_
a. 0.5
b. 2
c. 220
d. 440
motors are
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