What is a servo motor and how does it work?

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asked Mar 10, 2018 by anonymous

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asked Apr 28, 2018 by anonymous

Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor

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asked Apr 26, 2018 by anonymous

Which of the following motors is being extensively used in servo applications ?

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asked Mar 14, 2018 by anonymous

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asked Sep 22, 2018 by anonymous

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asked Sep 2, 2019 by anonymous

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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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asked Jan 12 by anonymous

A and B together can complete a work in 24 days. A alone can complete it in 40 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work? a) 24 days b) 15 days c) 21 days d) 19 days

Last answer: A B’s 1 day’s work = (1/24 -1/40) =(5-3)/120 =2/120=>1/60 Now, (A + B)’s 1 day’s work = (1/40 +1/60) =(3+2)/120 =5/120 So, A and B together will complete the work in 120/5 = 24 days.

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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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asked Jan 12 by anonymous

Madhesh does half work as much as vinith in three eighth of the time. If together they take a day to complete the work, how much time shall vinith take to do it? a) 21 b) 22 c) 23 d) 24

Last answer: A Suppose vinith takes x days to do the work Madhesh takes (2*3/8 x) = 6/8x i.e., 3/4x days to do it (madhesh + vinith’s) 1 day work = 1/9 Therefore 1/x +4/3x = 1/9 (3+4) / 3x = 1/9 7/3x = 1/9 3x = 9*7 X = 63/ 3 =21 Vinith takes 21 days to do the work.

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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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asked Jan 12 by anonymous

A motor bike tyre has two punctures. The 1st puncture alone would have made the tyre flat in 27 minutes and the 2nd alone would have done it in 18 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat? a) 20 4/3 minutes b) 15 4/7 minutes c) 10 4/5 minutes d) 25 4/3 minutes

Last answer: C 1st puncture made the tyre flat in 27 mins 2nd puncture made the tyre flat in 18 mins 1 minute’s work of both the punctures = (1/27 + 1/18) =(2+3)/54 =5/54 So, both the punctures will make the tyre flat in 54/5 mins =>10 4/5 minutes

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asked Mar 17, 2018 by anonymous

How is a three phase cage induction motor self starting?

Last answer: Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting

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asked Mar 15, 2018 by anonymous

Why does induction motor have high starting current?

Last answer: In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor

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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.

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asked Apr 29, 2018 by anonymous

In a DC motor, it is important to place the brushes along ______

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

Last answer: In a DC motor, it is important to place the brushes along Magnetic Neutral Axis

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asked Mar 20, 2018 by anonymous

At the instant of starting when a D.C. motor is put on supply, it behaves like?

Last answer: At the instant of starting when a D.C. motor is put on supply, it behaves like a low resistance circuit.

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65 views 1 answer

asked Mar 20, 2018 by anonymous

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

Last answer: By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.

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80 views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. motor is connected across the A.C. supply it will?

Last answer: If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.

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75 views 1 answer

asked Mar 20, 2018 by anonymous

After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?

Last answer: Reason is kinetic energy

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132 views 2 answers

asked Mar 20, 2018 by anonymous

If a D.C. series motor is operated on A.C. supply, it will?

Last answer: If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

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64 views 1 answer

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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87 views 1 answer

asked Mar 20, 2018 by anonymous

To reverse the direction of rotation of a capacitor start motor while it is running we should?

Last answer: To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.

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80 views 1 answer

asked Mar 20, 2018 by anonymous

If starting winding of a single-phase induction motor is left in the circuit, it will?

Last answer: If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.

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186 views 1 answer

asked Mar 15, 2018 by anonymous

How do you measure the speed of a motor?

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37 views 0 answers

asked Apr 29, 2018 by anonymous

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

Last answer: What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

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asked Jan 12 by anonymous

6 male , 8 female and 12 children can complete a work in 14 days .a female does twice the work of a male does and a child does half the work a male does . how many female alone can complete this work in 14 days? a) 15 b) 10 c) 12 d) 14

Last answer: D Let 1 female ‘s 1 day work= x Then 1 male’s 1 day work =x/2 And 1 child’s 1 day work =x/4 So 6x/2 + 8x +12x/4 =1/14 3x+8x+3x = 1/14 14x = 1/14 X=196 1 female alone can complete the work in 196 days So, to complete the work in 14 days number of female required = 14.

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asked Jan 11 by anonymous

Two cogged wheels of which one has 32 cogs and other 54 cogs, work into each other. If the latter turns 80 times in three quarters of a minute, how often does the other turn in 8 seconds? A) 48 B) 24 C) 38 D) 39 E) None of these

Last answer: Answer: B Number of turns required= 80 × 54/32 × 8/45 = 24 24 times

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asked Jul 8, 2018 by Rathod vijay R.

How many induction motor types

And application.

Last answer: AC and DC motar

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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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195 views 1 answer

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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asked Mar 15, 2018 by anonymous

How can we improve power factor using synchronous motor?

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60 views 0 answers

asked Oct 4, 2017 by anonymous

how can we reverse the direction of rotation of three phase induction motor?

how can we reverse the direction of rotation of three phase induction motor ?

Last answer: The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.

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asked Aug 28, 2019 by anonymous

What is the difference between Generator and Motor?

Last answer: If a rotating machine delivers a power as output it is called generator. If power required to rotate a machine it is called motor.

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98 views 3 answers

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.

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237 views 2 answers

James · Answer 1 · 2018-03-12T21:43:03+0000

It is a simple electrical motor that is operated by AC or DC signal in order to provide a precise angular motion for a given electrical signal.

What is a servo motor and how does it work?

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