menu search
person
thumb_up_alt 0 like thumb_down_alt 0 dislike
65 views

1 Answer

The rotor developed by a single-phase motor at starting is zero.

thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

Description :

Answer :

The starting winding of a single-phase motor is placed in stator.

thumb_up_alt 0 like thumb_down_alt 0 dislike
75 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
207 views 1 answer
Description :

Answer :

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.

thumb_up_alt 0 like thumb_down_alt 0 dislike
184 views 1 answer
Description :

Answer :

In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

thumb_up_alt 0 like thumb_down_alt 0 dislike
99 views 1 answer
Description :

Answer :

In a shaded pole single-phase motor, the revolving field is produced by the use of shading coils.

thumb_up_alt 0 like thumb_down_alt 0 dislike
99 views 1 answer
Description :

Answer :

In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

thumb_up_alt 0 like thumb_down_alt 0 dislike
147 views 1 answer
Description :

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

Answer :

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then the flux first decreases and then increases in the same direction

thumb_up_alt 0 like thumb_down_alt 0 dislike
80 views 1 answer
Description :

Answer :

Torque developed by a D.C. motor depends upon magnetic field, active length of the conductor, current flow through the conductors, number of conductors, radius of armature.

thumb_up_alt 0 like thumb_down_alt 0 dislike
379 views 1 answer
Description :

Answer :

A single-phase induction motor is inherently non-self-starting with low torque.

thumb_up_alt 0 like thumb_down_alt 0 dislike
58 views 1 answer
Description :

Answer :

The power factor of a single-phase induction motor is usually lagging.

thumb_up_alt 0 like thumb_down_alt 0 dislike
128 views 1 answer
Description :

Answer :

If the capacitor of a single-phase motor is short-circuited the motor will not start.

thumb_up_alt 0 like thumb_down_alt 0 dislike
94 views 1 answer
Description :

Answer :

Capacitor start motor has high torque in starting

thumb_up_alt 0 like thumb_down_alt 0 dislike
101 views 1 answer
Description :

Answer :

The value of starting capacitor of a fractional horse power motor will be 300 uF .

thumb_up_alt 0 like thumb_down_alt 0 dislike
83 views 1 answer
Description :

Answer :

A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

thumb_up_alt 0 like thumb_down_alt 0 dislike
263 views 1 answer
Description :

Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) is greater than that of a normal induction motor (D) may be less or greater than that of a normal induction motor

Answer :

C

thumb_up_alt 0 like thumb_down_alt 0 dislike
382 views 2 answers
Description :

Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

thumb_up_alt 0 like thumb_down_alt 0 dislike
95 views 0 answers
Description :

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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
129 views 1 answer
Description :

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

Answer :

In a single-phase induction motor, the operating direction is determined by the Starting circuit

thumb_up_alt 0 like thumb_down_alt 0 dislike
84 views 1 answer
Description :

How is a three phase cage induction motor self starting?

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 

thumb_up_alt 0 like thumb_down_alt 0 dislike
105 views 1 answer
Description :

List different starting methods of three phase synchronous motor. Explain any one of them.

Answer :

Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
79 views 1 answer
Description :

A synchronous motor can be made self starting by providing?

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
113 views 1 answer
Description :

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

Answer :

The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be 0.5 Ohm

thumb_up_alt 0 like thumb_down_alt 0 dislike
135 views 1 answer
Description :

Answer :

Locked rotor current of a shaded pole motor is slightly more than full load current.

thumb_up_alt 0 like thumb_down_alt 0 dislike
61 views 1 answer
Description :

Answer :

The rotor of a hysteresis motor is made of chrome steel.

thumb_up_alt 0 like thumb_down_alt 0 dislike
46 views 1 answer
Description :

Answer :

In a hysteresis motor, the rotor must have retentivity.

thumb_up_alt 0 like thumb_down_alt 0 dislike
58 views 1 answer
Description :

What is the rotor of a motor?

Answer :

Rotor is the rotating or moving part in motor and generator.

thumb_up_alt 0 like thumb_down_alt 0 dislike
123 views 1 answer
Description :

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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
110 views 1 answer
Description :

In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high resistance winding. (C) Small current flows through the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

Answer :

In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.

thumb_up_alt 0 like thumb_down_alt 0 dislike
101 views 1 answer
Description :

Answer :

The starting resistance of a D.C. motor is generally low.

thumb_up_alt 0 like thumb_down_alt 0 dislike
90 views 1 answer
Description :

Answer :

For starting a D.C. motor a starter is required because it limits the starting current to a safe value.

thumb_up_alt 0 like thumb_down_alt 0 dislike
67 views 1 answer
Description :

Why a dc series motor has a high starting torque?

thumb_up_alt 0 like thumb_down_alt 0 dislike
70 views 0 answers
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
140 views 1 answer
Description :

Is induction motor is self starting?

Answer :

Single phase induction motor is not self starting. Three phase induction motor is self starting.

thumb_up_alt 0 like thumb_down_alt 0 dislike
97 views 1 answer
Description :

Why starter is required for starting an induction motor?

thumb_up_alt 0 like thumb_down_alt 0 dislike
103 views 0 answers
Description :

Why does induction motor have high starting current?

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
124 views 2 answers
Description :

Answer :

In capacitor start single-phase motors current in the starting winding leads the voltage.

thumb_up_alt 0 like thumb_down_alt 0 dislike
66 views 1 answer
Description :

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

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
242 views 1 answer
Description :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

Answer :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

thumb_up_alt 0 like thumb_down_alt 0 dislike
127 views 1 answer
Description :

A 3-phase, 4-pole, 50Hz induction motor runs at a speed of 1440 rpm. The rotating field produced by the rotor rotates at a speed of ________ rpm with respect to stator field. (A) 1500 (B) 0 (C) 1440 (D) 60

Answer :

0

thumb_up_alt 0 like thumb_down_alt 0 dislike
979 views 2 answers
Description :

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

Answer :

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is unstable torque

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.9k views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
156 views 2 answers
Description :

Why a single phase motor is not a self starting motor

Answer :

The motor mechanical degree 360 degree this must covered revolving field so single phase to starting need starting winding with 90 degree to main winding

thumb_up_alt 3 like thumb_down_alt 0 dislike
198 views 7 answers
Description :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

Answer :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

thumb_up_alt 0 like thumb_down_alt 0 dislike
132 views 1 answer
Description :

A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is (A) 216 V (B) 226 V (C) 234 V (D) 236 V

Answer :

A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred resistance of 0.2 Ω and reactance of 0.5 Ω. The approximate primary induced emf is 226 V

thumb_up_alt 0 like thumb_down_alt 0 dislike
94 views 1 answer
Description :

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

Answer :

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.

thumb_up_alt 0 like thumb_down_alt 0 dislike
95 views 1 answer
Description :

Answer :

In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.

thumb_up_alt 0 like thumb_down_alt 0 dislike
174 views 1 answer
Description :

Answer :

Single phase induction motor usually operates on 0.6 power factor lagging.

thumb_up_alt 0 like thumb_down_alt 0 dislike
107 views 1 answer
Description :

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW

Answer :

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is 83.33 kW

thumb_up_alt 0 like thumb_down_alt 0 dislike
144 views 1 answer
Description :

The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

Answer :

The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.

thumb_up_alt 0 like thumb_down_alt 0 dislike
84 views 1 answer
Description :

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip

Answer :

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation

thumb_up_alt 0 like thumb_down_alt 0 dislike
109 views 1 answer
editAsk a Question
...