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

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asked Mar 15, 2018 by anonymous

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The capacitors used in single-phase capacitor motors have no?

Last answer: The capacitors used in single-phase capacitor motors have no polarity marking.

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Last answer: Stepper motors are used in printers

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asked Mar 20, 2018 by anonymous

Starters are used with D.C. motors because?

Last answer: Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.

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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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asked Mar 20, 2018 by anonymous

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a?

Last 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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asked Oct 24, 2017 by anonymous

explain the working of single phase induction motor.

Last 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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103 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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108 views 1 answer

asked Mar 17, 2018 by anonymous

How does a single phase induction motor work?

Last 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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92 views 1 answer

asked Aug 9, 2017 by anonymous

Single Phase Induction Motor

Last 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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450 views 1 answer

asked Sep 2, 2019 by anonymous

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

Last 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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127 views 6 answers

asked Mar 20, 2018 by anonymous

D.C. shunt motors are used for driving?

Last answer: D.C. shunt motors are used for driving machine tools.

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68 views 1 answer

asked Mar 21, 2018 by anonymous

The power factor of a single phase load can be calculated if the instruments available are?

Last 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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133 views 2 answers

asked May 3, 2020 by anonymous

State the different types of outdoor flood lighting and where are they used.

Last answer: There are three types of projectors used for flood lighting : a) Narrow beam Projector b) Medium angle Projector c) Wide angle Projector a) Narrow beam Projectors: - Light beam with such ... yards, stadiums, car parking area etc. 3) It is used for illuminating advertisements, boarding's etc.

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68 views 1 answer

asked Mar 20, 2018 by anonymous

The single phasing relays are used for the protection of?

Last answer: The single phasing relays are used for the protection of three phase motors.

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133 views 1 answer

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 Apr 29, 2018 by anonymous

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016

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

Last 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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135 views 1 answer

asked May 8, 2018 by anonymous

A relay used for protection of motors against overload is :

A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

Last answer: A relay used for protection of motors against overload is : Thermal relay

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232 views 1 answer

asked Aug 13, 2019 by Alacrity

the volt per turn of a certain single phase transformers is 1.7. the transformer has a step ratio of 3825/255volt. calculate the respective number of turns in each winding

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49 views 0 answers

asked Apr 25, 2018 by anonymous

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is

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

Last 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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139 views 1 answer

asked Mar 21, 2018 by anonymous

In a single phase power factor meter the phase difference between the currents in the two pressure coils is?

Last 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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158 views 1 answer

asked Mar 20, 2018 by anonymous

In a single phase motor the centrifugal switch?

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

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asked May 7, 2020 by anonymous

State different types of holders used in wiring installation.

Last answer: Following types of holders used in wiring installation: 1. Pendent Holder 2. Batten Holder 3. Angle holder 4. Screwed holder

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asked Mar 21, 2018 by anonymous

Induction type single phase energy meters measure electric energy in?

Last answer: Induction type single phase energy meters measure electric energy in kWh.

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asked Mar 11, 2018 by anonymous

Explain power in single phase AC circuit.

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asked Jul 30, 2019 by anonymous

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

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

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asked Jul 25, 2019 by anonymous

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

Last 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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158 views 1 answer

asked Apr 28, 2018 by anonymous

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum

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

Last 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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690 views 1 answer

asked Apr 25, 2018 by anonymous

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is

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%

Last 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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264 views 1 answer

asked Mar 21, 2018 by anonymous

The two pressure coils of a single phase power factor meter have?

Last 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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asked Mar 20, 2018 by anonymous

The running winding of a single phase motor on testing with meggar is found to be ground...

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?

Last 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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84 views 1 answer

asked Mar 19, 2018 by anonymous

For the parallel operation of single phase transformers it is necessary that they should have?

Last 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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111 views 2 answers

asked Aug 21, 2019 by anonymous

working principle of single phase motor

Last 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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93 views 1 answer

asked Jul 26, 2019 by anonymous

Explain construction and working principle of single phase transformer.

Last 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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326 views 4 answers

asked Aug 11, 2018 by anonymous

State advantages of three phase over single phase.

Last 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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2.8k views 4 answers

asked May 3, 2018 by anonymous

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage

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

Last 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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223 views 1 answer

asked Apr 27, 2020 by anonymous

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

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asked Mar 11, 2018 by anonymous

Describe the gate circuit for a single phase full converter.

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asked May 21, 2020 by anonymous

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

Last answer: Circuit Diagram: Waveforms:

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asked May 16, 2020 by anonymous

Single phase transformer

Last answer: Single phase Transformer Transformer

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asked May 7, 2020 by anonymous

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

Last 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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asked May 7, 2020 by anonymous

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

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asked Mar 20, 2018 by anonymous

Single phase induction motor usually operates on?

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

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97 views 1 answer

asked Mar 20, 2018 by anonymous

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by...

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?

Last 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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asked Mar 18, 2018 by anonymous

An unexcited single phase synchronous motor is ?

Last answer: An unexcited single-phase synchronous motor is reluctance motor.

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asked Dec 12, 2017 by anonymous

write short notes on single phase system.

Last 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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three phase to single phase cycloconverter

Last answer: three phase to single phase cycloconverter

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single phase full converter

Last answer: single phase full converter

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asked Mar 21, 2018 by anonymous

Describe different RT level computational and sequential components used to design single function processors.

Last answer: RT-level combinational components:- To reduce the complexity in digital logic, combinational components are used, which are more powerful than logic gates. Such combinational ... during a clock edge. An asynchronous inputs value effects the circuit independent of the clock.

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asked Mar 20, 2018 by anonymous

Which relays are used for phase faults on long line?

Last answer: Impedance relays are used for phase faults on long line.

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asked Mar 19, 2018 by anonymous

Which type of winding is used in 3 phase shell-type transformer ?

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

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

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