Why the speed of synchronous motor is constant?

Question

asked Mar 15, 2018 by anonymous

53 views

Please log in or register to answer this question.

← Prev Question Next Question →

Related questions

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.

0 like 0 dislike

87 views 1 answer

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.

0 like 0 dislike

139 views 1 answer

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.

0 like 0 dislike

69 views 1 answer

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.

0 like 0 dislike

213 views 1 answer

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.

0 like 0 dislike

83 views 1 answer

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.

0 like 0 dislike

68 views 1 answer

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

1 like 0 dislike

119 views 2 answers

asked Mar 18, 2018 by anonymous

Synchronous motor always runs at which speed?

Last answer: Synchronous motor always runs at synchronous speed.

0 like 0 dislike

55 views 1 answer

asked Mar 20, 2018 by anonymous

For constant torque drive which speed control method is preferred ?

Last answer: For constant torque drive armature voltage control speed control method is preferred.

0 like 0 dislike

86 views 1 answer

asked Mar 15, 2018 by anonymous

Why synchronous motor Cannot start itself?

0 like 0 dislike

59 views 0 answers

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

0 like 0 dislike

118 views 1 answer

asked Mar 20, 2018 by anonymous

As the load is increased the speed of D.C. shunt motor will?

Last answer: As the load is increased the speed of D.C. shunt motor will reduce slightly.

0 like 0 dislike

105 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a D.C. series motor is?

Last answer: The speed of a D.C. series motor is inversely proportional to the armature current.

0 like 0 dislike

70 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a universal motor is usually reduced by using?

Last answer: The speed of a universal motor is usually reduced by using gearing.

0 like 0 dislike

77 views 1 answer

asked Mar 20, 2018 by anonymous

The speed/load characteristics of a universal motor is same as that of?

Last answer: The speed/load characteristics of a universal motor is same as that of D.C. series motor.

0 like 0 dislike

69 views 1 answer

asked Mar 20, 2018 by anonymous

The speed control of universal motor used for sewing machines is by?

Last answer: The speed control of universal motor used for sewing machines is by varying the resistance.

0 like 0 dislike

69 views 1 answer

asked Mar 20, 2018 by anonymous

Speed control of a universal motor is achieved by?

Last answer: Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

0 like 0 dislike

76 views 1 answer

asked Mar 20, 2018 by anonymous

Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.?

Last answer: Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.

0 like 0 dislike

68 views 1 answer

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.

0 like 0 dislike

2.5k views 1 answer

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

0 like 0 dislike

220 views 1 answer

asked Apr 28, 2018 by anonymous

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

Last answer: The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm

0 like 0 dislike

121 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a D.C. motor can be controlled by varying

The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

Last answer: The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

0 like 0 dislike

112 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a D.C. shunt motor can be increased by?

Last answer: The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

0 like 0 dislike

88 views 1 answer

asked Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

Last answer: Field control of DC motor Armature control of DC motor

3 like 0 dislike

150 views 2 answers

asked Apr 28, 2018 by anonymous

The effect of increasing load on a synchronous motor running with normal excitation is

The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

Last answer: The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

0 like 0 dislike

399 views 1 answer

asked Mar 15, 2018 by anonymous

What is the principle of synchronous motor?

0 like 0 dislike

54 views 0 answers

asked Mar 15, 2018 by anonymous

What is the use of synchronous motor?

0 like 0 dislike

57 views 0 answers

asked Mar 20, 2018 by anonymous

In a D.C. shunt motor, speed is?

Last answer: In a D.C. shunt motor, speed is independent of armature current.

0 like 0 dislike

61 views 1 answer

asked Aug 9, 2017 by anonymous

speed control methods of three phase induction motor?

Last answer: Speed control of three phase induction motor

0 like 0 dislike

191 views 2 answers

asked Mar 20, 2018 by anonymous

Which motor has the poorest speed control?

Last answer: Series motor has the poorest speed control.

0 like 0 dislike

79 views 1 answer

asked Mar 20, 2018 by anonymous

For the same H.P. rating and full load speed, following motor has poor starting torque?

Last answer: For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

0 like 0 dislike

114 views 1 answer

asked Aug 6, 2017 by anonymous

what is the difference between synchronous and asynchronous motor?

Last answer: Asynchronous motors and syncrouns motor are called as dc machines. and also syncrouns motor called as induction motor. Asynonymous motor as are rotates with constant speed we not able to operate . ... It is able to operate. These are a small difference between syncrouns and asynchronous motors.

0 like 0 dislike

237 views 2 answers

asked Apr 28, 2018 by anonymous

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Last answer: The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

0 like 0 dislike

71 views 1 answer

asked Mar 20, 2018 by anonymous

In variable speed motor?

Last answer: In variable speed motor a weaker commutating field is needed at low speed than at high speed.

0 like 0 dislike

45 views 1 answer

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

0 like 0 dislike

455 views 2 answers

asked Mar 6, 2018 by anonymous

Can we make power factor of synchronous motor leading by adjusting its excitation?

Last answer: Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.

0 like 0 dislike

83 views 1 answer

asked Mar 3, 2018 by anonymous

In synchronous motor, does the winding losses vary with load?

Last answer: No, in the synchronous motor the winding losses do not vary with load.

0 like 0 dislike

492 views 1 answer

asked May 8, 2018 by anonymous

Damper winding in a synchronous motor

Last answer: Damper winding in a synchronous motor Serves to start the motor.

0 like 0 dislike

58 views 1 answer

asked Mar 15, 2018 by anonymous

How can we improve power factor using synchronous motor?

0 like 0 dislike

60 views 0 answers

asked Mar 20, 2018 by anonymous

If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?

Last answer: If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.

0 like 0 dislike

111 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a universal motor is generally reduced by using?

Last answer: The speed of a universal motor is generally reduced by using gear trains.

0 like 0 dislike

69 views 1 answer

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.

0 like 0 dislike

208 views 1 answer

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

0 like 0 dislike

122 views 1 answer

asked Mar 15, 2018 by anonymous

How do you measure the speed of a motor?

0 like 0 dislike

36 views 0 answers

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.

0 like 0 dislike

173 views 1 answer

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.

0 like 0 dislike

113 views 1 answer

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.

0 like 0 dislike

116 views 1 answer

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.

0 like 0 dislike

135 views 1 answer

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.

0 like 0 dislike

735 views 1 answer

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.

0 like 0 dislike

80 views 1 answer

Why the speed of synchronous motor is constant?

Please log in or register to add a comment.

Please log in or register to answer this question.

0 Answers

Related questions