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What is a stator in a motor?

1 Answer

Stator is the stationary part of the electrical machine both motor and generator. In motor it provide the rotating magnetic field to drive rotor and in case of generator stator convert rotating magnetic field into current.

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Description : What causes stator failure?

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Answer : The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.

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.

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Answer : The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

Description : A _________ is used to measure the stator % winding temperature of the generator.  (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer

Answer : A Resistance thermometer is used to measure the stator % winding temperature of the generator. 

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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?

Description : number of windings of a coil in a stator of ac motor for ey slot ac motor

Description : What is the rotor of a motor?

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

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

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Description : For a DC motor, what major component in addition to the field winding and the armature winding is necessary? w) a commutator x) a stator y) a battery z) a rotor

Answer : ANSWER: W -- A COMMUTATOR

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Answer : In a Synchronous motor, the magnitude of stator back e.m.f (Eb) depends on DC excitation only

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

Description : A permanent magnet stepper motor with 8 poles in stator and 6 poles in rotor will have a step angle of (a) 7.5° (b) 15° (c) 30° (d) 60°

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Description : Explain speed control method of 3 phase induction motor by the following methods: (1) Pole changing (2) Rotor resistance control (3) Stator voltage

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Description : The stator of a 415V, 50 Hz, 4-pole slip ring Induction Motor is excited by rated frequency with slip rings open circuited. The rotor is made to rotate at a speed of 600 rpm in the opposite direction to the normal direction, The frequency of induced voltage across slip ring is A) 30 Hz B) 70 Hz C) 20 Hz D) 35 Hz

Answer : The stator of a 415V, 50 Hz, 4-pole slip ring Induction Motor is excited by rated frequency with slip rings open circuited. The rotor is made to rotate at a speed of 600 rpm in the opposite direction to the normal direction, The frequency of induced voltage across slip ring is 70 Hz

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Answer : Which of the following motor has squirrel cage winding on the stator: (1) 3 phase squirrel cage induction motor (2) Single phase squirrel cage pump motor (3) Single phase ceiling fan induction motor (4) Single phase table fan induction motor 

Description :

A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is:

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Answer : A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited stator is: Slip frequency

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Description : A 3-phase induction motor under locked rotor condition and with stator supply, induces (A) small voltage at slip frequency (B) large voltage at rotor frequency (C) zero voltage at zero frequency (D) large voltage at slip frequency

Answer : A 3-phase induction motor under locked rotor condition and with stator supply, induces (A) small voltage at slip frequency (B) large voltage at rotor frequency (C) zero voltage at zero frequency (D) large voltage at slip frequency

Description : An 1.8° step, 4 -phase stepper motor has 40 teeth on 8 poles of the stator. The number of rotor teeth for their rotor will be: (A) 40 (B) 50 (C) 100 (D) 80

Answer : An 1.8° step, 4 -phase stepper motor has 40 teeth on 8 poles of the stator. The number of rotor teeth for their rotor will be: 50

Description : A 3-phase, 50 Hz, 500 V induction motor develops 20 hp at slip of 5%. Mechanical losses are 1 hp, and stator loss is 1 kW. The efficiency will be   (a) 95.3% (b) 90.5% (c) 91.3% (d) 85.3% 

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Description : Stator Voltage Control of three phase induction motor

Answer : Stator Voltage Control of three phase induction motor

Description : lf slip of an induction machine is 0.02 and the stator supply frequency is 50 Hz, what will be the frequency of the rotor induced e.m.f.? (A) 10 Hz (B) 50 Hz (C) 1 Hz (D) 2500 Hz

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I got some grapic drawing questions guys and I need to see the answers immediately.
Stator voltage curve for each four different start up methods.
image

Description : In an ac tachometer, the two stator field coils are mounted

Answer : In an ac tachometer, the two stator field coils are mounted in space quadrate

Description :

A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with 60o phase spread. Coil span is 7 short pitches. Number of slots in which top and bottom layers belong to different phases is 

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Answer : A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with 60o phase spread. Coil span is 7 short pitches. Number of slots in which top and bottom layers belong to different phases is 24 

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Answer : If stator field is rotating in clockwise direction rotor rotates in clockwise 

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Answer : The stator and rotor pole number may be different in a Reluctance motor.

Description :

When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor?

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Description : Which type of protection is provided on a generator to protect against stator insulation failure? A) Differential protection B) Overcurrent relay C) Thermocouple actuated alarm D) Reverse power relay

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Answer : D  is correct

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