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Explain power in single phase AC circuit.
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Explain power relations in three phase circuit.

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

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Answer :

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

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Description :

Describe the gate circuit for a single phase full converter.

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Answer :

In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

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What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Answer :

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

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Answer :

The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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Answer :

The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.

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Description :

List any two methods of reactive power measurement in 3 phase circuit.

Answer :

Methods of reactive power measurement in 3 phase circuit: (i) Two single phase wattmeter method (ii) One single phase wattmeter method

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Description :

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.  

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3.1k views 1 answer
Description :

In an A.C. circuit power is dissipated in?

Answer :

In an A.C. circuit power is dissipated in resistance only.

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Description :

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

Answer :

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is 6 kVAR.

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Description :

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

Answer :

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.

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355 views 1 answer
Description :

Pure inductive circuit takes power from the A.C. line when?

Answer :

It takes power when voltage decreases and current increases.

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1.0k views 2 answers
Description :

Explain MCB and ELCB with connection diagram supplying single phase load. 

Answer :

OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel. 

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Description :

Explain the working of a single phase capacitor start induction motor. 

Answer :

Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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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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569 views 4 answers
Description :

explain the working of single phase induction motor.

Answer :

Stator has two winding namely main winding and auxiliary winding.when single phase ac supply is given to the motor,its produces alternating field.this field cut by a cage rotor.so some emf ... due to this emf,rotor flux produced.the interaction between two fluxes produce torque.so rotor rotates.

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Description :

Draw the single stage RC coupled amplifier circuit and explain its’s operation.

Answer :

Operation:- The capacitors C1 and C2 are called as the coupling capacitors. As the load resistor RL (not shown in the diagram) is coupled to the amplifier through the coupling capacitor ... connected in the common emitter (CE) configuration. Therefore, this amplifier is called CE amplifier. 

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3.1k views 1 answer
Description :

Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer :

In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

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Description :

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W

Answer :

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is 500 W

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Description :

Answer :

Induction type single phase energy meters measure electric energy in kWh.

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Answer :

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

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Description :

What are the five types of single phase motors used in the industry?

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Description :

Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it. 

Answer :

Circuit Diagram: Waveforms:

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327 views 1 answer
Description :

Single phase transformer

Answer :

Single phase Transformer Transformer

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242 views 1 answer
Description :

State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders

Answer :

Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor

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Description :

working principle of single phase motor

Answer :

The Stator of single phase induction motor houses two windings  1. Main (Running) winding 2. Auxiliary (Starting ) winding Rotor of single phase induction motor is ... with starting winding or a capacitor may be permanently connected in series with Auxiliary (Starting ) winding.

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115 views 1 answer
Description :

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Answer :

Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

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266 views 1 answer
Description :

State advantages of three phase over single phase.

Answer :

Advantages of 3-phase system over 1-phase system: -  1. More output: For the same size, output of poly-phase machines is always higher than single phase machines.  2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.

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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

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261 views 1 answer
Description :

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

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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Description :

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

Answer :

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

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Description :

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

Answer :

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%

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Description :

Answer :

If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.

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Description :

Answer :

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

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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.

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130 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.

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95 views 1 answer
Description :

Answer :

Necessary conditions required to be satisfied in order to ensure successful parallel operation of single phase transformers:  1. Only transformers having the same phase displacement between primary and secondary ... . 7. The phase sequence must be followed strictly on HV and LV side connection.

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Description :

An unexcited single phase synchronous motor is ?

Answer :

An unexcited single-phase synchronous motor is reluctance motor.

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116 views 1 answer
Description :

How does a single phase induction motor work?

Answer :

As we know that single phase induction is not self started because for self started we require atleast two revolving field but single phase induction motor has only one. So we provide extra ... 1phase IM classified as split phase IM, capacitor start capacitor run, capacitor start induction run.

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Description :

write short notes on single phase system.

Answer :

A "phase" in an electrical system is often referred to as the waveform (may be voltage or the current) of the power supply. The waveform in an AC system is typically ... domestic household or commercial supplies and street lighting. Industrial supplies requires three phase electrical supply .

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Description :

three phase to single phase cycloconverter

Answer :

three phase to single phase cycloconverter

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Description :

single phase full converter

Answer :

single phase full converter

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96 views 1 answer
Description :

Single Phase Induction Motor

Answer :

Single Phase Induction Motor Single phase induction motor is mostly used in home, office, shop and many single phase appliances like pumps,  ... torque and silent operation. It is uses where silent operation is required.

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471 views 1 answer
Description :

Explain working of static AC circuit breaker. 

Answer :

Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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150 views 1 answer
Description :

Explain working of AC circuit breaker using SCR with circuit diagram.

Answer :

AC Circuit Breaker:  The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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Description :

Draw the waveform of three phase AC supply voltage.

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