Synchronous motor always runs at which speed?

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asked Mar 18, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

The operating speed of a synchronous motor can be changed to new fixed value by?

Last answer: The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

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1

asked Mar 18, 2018 by anonymous

If we change the excitation of synchronous machine will it affect on motor speed?

Last answer: No, If we change the excitation of synchronous machine it will not affect on motor speed.

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asked Mar 20, 2018 by anonymous

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

Last answer: Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

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asked Mar 20, 2018 by anonymous

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?

Last answer: If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.

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4

asked Mar 20, 2018 by anonymous

An alternator coupled to a _____ runs at slow speed, as compared to others.

Last answer: An alternator coupled to a hydraulic turbine runs at slow speed, as compared to others.

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5

asked Mar 20, 2018 by anonymous

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will?

Last answer: In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

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6

asked Mar 15, 2018 by anonymous

Why the speed of synchronous motor is constant?

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7

asked Dec 31, 2017 by anonymous

The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

Last answer: Ns equals f/pair pole 50/4 - 12.5

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asked Mar 20, 2018 by anonymous

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

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9

asked Mar 18, 2018 by anonymous

An electric motor in which both stator field and rotor rotates with same speed is called?

Last answer: An electric motor in which both stator field and rotor rotates with same speed is called synchronous motor.

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10

asked Mar 20, 2018 by anonymous

The maximum constant load torque under which a synchronous motor will pull into synchronism...

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

Last answer: The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

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11

asked Mar 18, 2018 by anonymous

Which motor have more efficiency, synchronous motor or induction motor?

Last answer: Synchronous motor has more efficiency.

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12

asked Mar 18, 2018 by anonymous

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Last answer: The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

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13

asked Mar 18, 2018 by anonymous

In a synchronous motor which losses varies with load?

Last answer: In a synchronous motor, copper losses varies with load.

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14

asked Mar 20, 2018 by anonymous

Slip-rings in a synchronous motor carry?

Last answer: Slip-rings in a synchronous motor carry direct current.

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15

asked Mar 20, 2018 by anonymous

The efficiency of a properly designed synchronous motor will usually fall in range?

Last answer: The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

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16

asked Mar 20, 2018 by anonymous

A synchronous motor has better power factor as compared to that of an equivalent induction motor...

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

Last answer: A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.

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17

asked Mar 20, 2018 by anonymous

A synchronous motor running with normal excitation adjusts to load increases essentially by increase in?

Last answer: A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.

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18

asked Mar 20, 2018 by anonymous

A synchronous motor can develop synchronous torque?

Last answer: A synchronous motor can develop synchronous torque at synchronous speed.

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19

asked Mar 20, 2018 by anonymous

In case one phase of a three-phase synchronous motor is short-circuited the motor will?

Last answer: In case one phase of a three-phase synchronous motor is short-circuited the motor will not start.

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20

asked Mar 20, 2018 by anonymous

In a synchronous motor, the armature current has large values for?

Last answer: In a synchronous motor, the armature current has large values for high and low excitation.

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21

asked Mar 20, 2018 by anonymous

The size of a synchronous motor decreases with the increase in?

Last answer: The size of a synchronous motor decreases with the increase in flux density.

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22

asked Mar 20, 2018 by anonymous

The duration of sudden short-circuit test on a synchronous motor is usually about?

Last answer: The duration of sudden short-circuit test on a synchronous motor is usually about one second.

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23

asked Mar 20, 2018 by anonymous

The construction of a synchronous motor resembles?

Last answer: The construction of a synchronous motor resembles an alternator.

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24

asked Mar 20, 2018 by anonymous

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?

Last answer: If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

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25

asked Mar 20, 2018 by anonymous

The coupling angle or load angle of synchronous motor is defined as the angle between the?

Last answer: The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.

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26

asked Mar 20, 2018 by anonymous

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?

Last answer: If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.

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27

asked Mar 20, 2018 by anonymous

The armature current of the synchronous motor?

Last answer: The armature current of the synchronous motor has large values for low and high excitation.

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28

asked Mar 18, 2018 by anonymous

How can we reverse the direction of rotation of synchronous motor?

Last answer: By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.

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183 views 1 answer

29

asked Mar 18, 2018 by anonymous

What is the maximum value of torque angle in synchronous motor?

Last answer: The maximum value of torque angle in synchronous motor is 90 degrees electrical.

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30

asked Mar 18, 2018 by anonymous

If the load of the normally excited synchronous motor is increased the power factor will?

Last answer: If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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31

asked Mar 18, 2018 by anonymous

Hunting in synchronous motor cannot be due to?

Last answer: Hunting in synchronous motor cannot be due to windage friction.

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32

asked Mar 18, 2018 by anonymous

The damping winding in synchronous motor is generally used to?

Last answer: The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

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33

asked Mar 18, 2018 by anonymous

If the field of synchronous motor is under excited, power factor will be?

Last answer: If the field of synchronous motor is under excited, power factor will be lagging.

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34

asked Mar 18, 2018 by anonymous

An unexcited single phase synchronous motor is ?

Last answer: An unexcited single-phase synchronous motor is reluctance motor.

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35

asked Mar 18, 2018 by anonymous

A synchronous motor can be made self starting by providing?

Last answer: A synchronous motor can be made self-starting by providing damper bar.

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asked Mar 18, 2018 by anonymous

The back emf of synchronous motor depends on?

Last answer: The back emf of synchronous motor depends on load angle.

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37

asked Mar 18, 2018 by anonymous

Can we use the synchronous motor as the synchronous capacitor?

Last answer: Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.

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38

asked Mar 18, 2018 by anonymous

The synchronous motor will develop maximum power when the load angle is?

Last answer: The synchronous motor will develop maximum power when the load angle is 900.

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39

asked Mar 18, 2018 by anonymous

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

Last answer: When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.

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270 views 1 answer

40

asked Mar 18, 2018 by anonymous

Three phase synchronous motor will have how many sliprings?

Last answer: Three phase synchronous motor will have two sliprings.

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41

asked May 8, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

Last answer: A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

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217 views 1 answer

42

asked Apr 28, 2018 by anonymous

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Last answer: The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

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122 views 1 answer

43

asked Mar 20, 2018 by anonymous

Which motor has the poorest speed control?

Last answer: Series motor has the poorest speed control.

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79 views 1 answer

44

asked Mar 15, 2018 by anonymous

Which motor has the best speed regulation?

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45

asked Apr 28, 2018 by anonymous

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor.

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. lf its shaft load is reduced by half and field current is held constant then its new power factor will be

Last answer: Leading

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453 views 2 answers

46

asked Aug 18, 2019 by anonymous

What will happen if the induction motor runs at synchronous speed ?

Last answer: Since there is always slip present in rotor it cannot run at synchronous speed no current will be developed hence no torque will developed

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68 views 3 answers

47

asked Oct 13, 2019 by anonymous

Speed control of the motor using TRIAC

Last answer: Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.

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207 views 1 answer

48

asked Jul 5, 2019 by anonymous

Why does the speed of a DC shunt motor decrease as the load increases?

Last answer: Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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2.5k views 1 answer

49

asked May 1, 2018 by anonymous

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above

Last answer: The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases

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118 views 1 answer

50

anonymous · Answer 1 · 2018-03-18T00:42:14+0000

answered Mar 18, 2018 by anonymous

Synchronous motor always runs at synchronous speed.

Synchronous motor always runs at which speed?

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