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

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Description :

Answer :

A phase shifting transformer is used in conjunction with Drysdale potentiometer.

Description :

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken?

Answer :

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken from the same source as the unknown voltage.

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For handling greater currents induction wattmeters are used in conjunction with current transformers.

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In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be out of phase by 90°.

Description :

State the use of:- (i) Clip-on-ammeter (ii) Phase sequence indicator

Answer :

(i) Clip-on-ammeter: used for measurement of current in cables/lines in live conditions without disconnecting them.  (ii) Phase sequence indicator: To determine /find the phase sequence of 3 phase supply. 

Description :

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

Answer :

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52

Description :

What is the use of Buchholz relay in transformer?

Answer :

This is a transformer that is used to step up and down current. 

Description :

Answer :

To measure a resistance with the help of a potentiometer it is not necessary to standardise the potentiometer.

Description :

What is the use of transformer?

Answer :

The use of transformer  is to do lower or raise  the voltage or currents in an electrical  circuit.  That's quite so simple. 

Description :

Answer :

Basically a potentiometer is a device for comparing two voltages.

Description :

Answer :

A potentiometer may be used for measurement of resistance, measurement of current, calibration of ammeter, calibration of voltmeter.

Description :

Answer :

Yes we can use potentiometer for measuring resistance.

Description :

Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

Description :

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is (A) 150 (B) 100 (C) 50 (D) 200

Answer :

When the voltage across a battery is measured using a D.C potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, ... resistance of the voltmeter is 1100 Ohm , the internal resistance of the battery, in Ohm , is 100

Description :

Answer :

In order to achieve high accuracy, the slide wire of a potentiometer should be as long as possible.

Description :

Why does a transformer only work with an AC supply?

Answer :

The transformer work depends on the induction as main principle ,for that AC is the right means

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 :

Source shifting problem solution

Description :

Answer :

 Sandwich type winding is used in 3 phase shell-type transformer.

Description :

Why do we use AC current in our homes?

Answer :

We used it for cooking rice,  For washing clothes and for lights in the house.

Description :

Single phase transformer

Answer :

Single phase Transformer Transformer

Description :

Explain construction and working principle of single phase transformer.

Answer :

A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.

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Do cell phones use AC or DC current?

Answer :

DC of course.

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What is the use of AC and DC drives?

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Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

Answer :

The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.  

Description :

 An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Answer :

 An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

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Explain power in single phase AC circuit.

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Draw the waveform of three phase AC supply voltage.

Description :

Write short notes on 3 phase AC system.

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A rheostat differs from potentiometer in the respect that it?

Answer :

A rheostat differs from potentiometer in the respect that it has higher wattage rating.

Description :

Can transformer convert AC to DC?

Answer :

No, Transformer cannot convert AC to DC.

Description :

What is a stator in a motor?

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.

Description :

State the function of following parts in Induction motor. (i) Stator (ii) Slip rings

Answer :

Name of part Function Stator 1) Stator frame supports the core, terminal box and protects the inner parts. 2) Stator core houses stator winding. 3) Stator winding ... ) Provides facility to connect external resistance to rotor circuit through brushes for starting and control.

Description :

Answer :

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

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. 

Description :

What causes stator failure?

Answer :

Stator faliur due to moistur. Due to priodically heatup of winding.

Description :

Answer :

The magnetising current of a transformer is usually small because it has small air gap.

Description :

In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core

Answer :

In a single-phase transformer, the magnetizing current is in phase with the flux in the core

Description :

Answer :

Igbt alone cant convert dc to ac. igbt half bridge or full bridge or three phase topology could be used to convert dc to ac. also igbt gates should be driven by microcontroller or pwm/spwm gate driving signals ... e4(-) and g4 c2e1 and c4e3 pins are AC output pins. its name is igbt inverter.

Description :

Answer :

To avoid the effect of stray magnetic field in A.C. bridges we can use magnetic screening.

Description :

Answer :

Material used for construction of transformer core is usually silicon steel.

Description :

Answer :

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

Description :

Use of auto-transformer is economical when the transformation ratio is?

Answer :

Use of auto-transformer is economical when the transformation ratio is near unity.

Description :

An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to  (1) 1.414 times dc sensitivity (2) dc sensitivity (3) 0.9 times dc sensitivity (4) 0.707 times dc sensitivity

Answer :

An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to 0.9 times dc sensitivity

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

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A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is (A) 0.85 Ω (B) 3.63 Ω (C) 36.3 Ω (D) 252 Ω

Answer :

A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is 3.63 Ω

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Answer :

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

Description :

Answer :

The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.

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