The single phasing relays are used for the protection of?

by

1 Answer

Answer :

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

by

Related questions

The inverse definite mean time relays are used for over current and earth fault protection of transformer against?

Last Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

Discrimination between main and backup protection is provided by the use of relays which are?

Last Answer : Discrimination between main and back up protection is provided by the use of relays which are slow.

IDMT relays are used to protect the transformer against :

Description : IDMT relays are used to protect the transformer against :  (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage

Last Answer : IDMT relays are used to protect the transformer against : External short circuits

Which relays are used for phase faults on long line?

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

A relay used for protection of motors against overload is :

Description : 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 : D

A negative sequence relay is used for protection of

Description : A negative sequence relay is used for protection of  (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines

Last Answer : A negative sequence relay is used for protection of Generator 

Surge absorbers are used for protection against

Description : Surge absorbers are used for protection against

Last Answer : Surge absorbers are used for protection against low voltage high frequency oscillations

With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.

Description : With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.

Last Answer : i) This test is carried out on 3-ph transformer to identify primary & secondary winding belonging to the same phase. ii) As shown in fig above all primary & secondary phases ... of this test is to check the respective phases of primary & secondary windings in 3-ph transformer

Why phasing out and polarity test is carried out on three phase transformer?

Description : Why phasing out and polarity test is carried out on three phase transformer?

Last Answer : The phasing out test is carried out to identify the windings (primary and secondary) of corresponding phase of the three phase transformer. The polarity test is carried out to identify the ... identical polarity of the primary and secondary windings of each phase of the three phase transformer.

To protect most of the electrical equipment handling low power, the types of relays used are?

Last Answer : To protect most of the electrical equipment handling low power, the types of relays used are thermocouple, electronic and bimetallic.

Protective relays are devices that detect abnormal conditions in electrical circuits by measuring?

Last Answer : Protective relays are devices that detect abnormal conditions in electrical circuits by measuring constantly the electrical quantities which differ during normal and abnormal conditions.

Directional relays are based on flow of?

Last Answer : Directional relays are based on flow of power.

D.C. shunt relays are made of?

Description : D.C. shunt relays are made of?

Last Answer : D.C. shunt relays are made of many turns of thin wire.

Thermal overload relays are used to protect the motor against over current due to?

Last Answer : Thermal overload relays are used to protect the motor against overcurrent due to heavy loads.

Overload relays are of?

Last Answer : Overload relays are of induction, solid state, thermal, electromagnetic type.

Relays can be designed to respond to changes in?

Last Answer : Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature.

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

Description : 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.

Consider the following statements. Which of these statements are correct ? (1) Reactance relays are preferred

Description : Consider the following statements. Which of these statements are correct ?  (1) Reactance relays are preferred for ground fault relaying  (2) Impedance relays are most suitable for:protecting long transmission lines  (3) Mho relays are best ... (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)

Last Answer : Consider the following statements. Which of these statements are correct ?  (1) Reactance relays are preferred for ground fault relaying  (2) Impedance relays are most suitable for:protecting long transmission lines  (3) Mho relays are ... (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)

Blind spot is a point in the zones of protection where

Description : Blind spot is a point in the zones of protection where

Last Answer : Blind spot is a point in the zones of protection where No protection is available.

For protection of rotating machines against lightning surges _______ is used.

Description : For protection of rotating machines against lightning surges _______ is used.  (1) lightning arrester (2) capacitor (3) combination of lightning arrester and capacitor (4) lightning conductor and arrester

Last Answer : For protection of rotating machines against lightning surges combination of lightning arrester and capacitor is used. 

Reactance relay is normally preferred for protection against

Description : Reactance relay is normally preferred for protection against

Last Answer : Reactance relay is normally preferred for protection against earth faults

Protection by fuses is generally not used beyond?

Last Answer : Protection by fuses is generally not used beyond 100 A .

A fuse in a motor circuit provides protection against?

Last Answer : A fuse in a motor circuit provides protection against short-circuit and overload.

Overfluxing protection is recommended for?

Last Answer : Overfluxing protection is recommended for generator transformer of the power plant.

Over voltage protection is recommended for?

Last Answer : Over voltage protection is recommended for hydro-electric generators, steam turbine generators, gas turbine generators.

For the protection of power station buildings against direct strokes the requirements are?

Last Answer : For the protection of power station buildings against direct strokes the requirements are interception, conduction and dissipation.

The delay fuses are used for the protection of?

Last Answer : The delay fuses are used for the protection of motors.

A thermal protection switch can protect against?

Last Answer : A thermal protection switch can protect against overload.

Primary and Backup Protection

Description : Primary and Backup Protection

Last Answer : Primary and Backup Protection  B,D,G,I are the primary protection. A,C,H,J are the backup protection. About 90% of faults are clear by Primary Protection. So ... ordinated backup (primary is at various station  and backup is at control room with computer)

In a single bus-bar system there will be complete shut down when?

Last Answer : In a single bus-bar system there will be complete shut down when fault occurs on the bus itself.

The single phasing relays are used for the protection of (a) single phase motors only (b) two phase motors only (c) two single phase motors running in parallel (d) three phase motors

Description : The single phasing relays are used for the protection of (a) single phase motors only (b) two phase motors only (c) two single phase motors running in parallel (d) three phase motors

Last Answer : (d) three phase motors

Can anyone recommend a good, durable protection case for iPod Touch 4th gen?

Description : Can anyone recommend a good, durable protection case for iPod Touch 4th gen?

Last Answer : I would highly recommend an Otterbox case. I have the Defender series case for my 3gen iPod touch. It's not perfect, but it provides better protection than any other case I've seen, and I like the ... ago, but that was only because I dropped my iPod and the case cracked. The ipod was fine though.

What is the purpose of Overload Protection in a motor circuit?

Description : What is the purpose of Overload Protection in a motor circuit?

Last Answer : Ans. The Overload Protection is used in a motor circuit to protect it from sustained over currents.

Car Leather Protection

Description : Car Leather Protection

Last Answer : Your girlfriend and your leather car interior have many things in common. Both are tough but incredibly sensitive. Both are cold and are very hard to please. Both need a lot of attention and ... differences too. Unlike your girlfriend, leather is not something you want to get down and dirty with.

Explain in detail over-voltage protection.

Description : Explain in detail over-voltage protection.

Last Answer : Over-voltage protection: Over-voltage protection to the thyristor is provided using: i) R-C Snubber circuit ii) Non-linear resistor Thyrector A) Snubber Circuit: It is basically a ... returns to its high resistance state. Thyrector is normally placed across the supply terminals.

Light triggering is mainly used in

Description : Light triggering is mainly used in

Last Answer : Light triggering is mainly used in High voltage direct current transmission

Earthing switch is used for?

Description : Earthing switch is used for?  (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above 

Last Answer : Earthing switch is used for?  (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above 

Auto reclosing is used in case of

Description : Auto reclosing is used in case of

Last Answer : Auto reclosing is used in case of air blast C.B.

The material used in liquid fuses is

Description : The material used in liquid fuses is  (1) SF6 (3) carbon tetra chloride (2) distilled water (4) transformer oil

Last Answer : The material used in liquid fuses is  carbon tetra chloride

Series reactors are used to

Description : Series reactors are used to

Last Answer : Series reactors are used to bring down the fault level within the capacity of the switchgear

ln a minimum oil circuit breaker the oil is used

Description : ln a minimum oil circuit breaker the oil is used

Last Answer : ln a minimum oil circuit breaker the oil is used to act as circuit breaking medium only

Regulating-transformers are used in power systems for control of

Description : Regulating-transformers are used in power systems for control of

Last Answer : Regulating-transformers are used in power systems for control of power flow

A switchgear is device used for?

Last Answer : A switchgear is device used for switching, controlling and protecting the electrical circuit and equipment.

The material used for fuse must have?

Last Answer : The material used for fuse must have low melting point and high specific resistance.

Series capacitors are used to?

Last Answer : Series capacitors are used to compensate for line inductive reactance.

The under voltage relay can be used for?

Last Answer : The under voltage relay can be used for generators, busbars, transformers, motors.

A.C. network analyser is used to solve problems of?

Last Answer : A.C. network analyser is used to solve problems of load flow, short-circuit and stability.

Wave trap is used to trap waves of?

Last Answer : Wave trap is used to trap waves of higher frequencies entering generator or transformer units.

Air blast circuit breaker is used for?

Last Answer : Air blast circuit breaker is used for repeated duty.

SINGLE PHASE INDUCTION MOTORS MCQ

Description : SINGLE PHASE INDUCTION MOTORS MCQ

Last Answer : 101. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on (a) running winding (b) rotor winding (c) field winding (d) compensating winding Ans: a ... motor is usually reduced by using (a) gearing (b) belts (c) brakes (d) chains Ans: a