Mho relay is usually employed for protection of

 Mho relay is usually employed for protection of (A) Short lines (B) Medium lines (C) Long lines (D) Any line
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2 Answers

Answer :

Mho realy is used for long distance tr lines


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Answer :

Mho relay is usually employed for protection of long lines.
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Related questions

Where mho relay used

Last Answer : Mho distance relays are widely used for the protection of uncompensated and series compensated transmission lines in order to determine the presence and location of faults.

Mho relay is ....

Description : Mho relay is   (a) current restrained current relay. (b) voltage restrained directional relay. (c) current restrained directional relay. (d) voltage restrained current relay. 

Last Answer : Mho relay is voltage restrained directional relay. Mho Relay is also known as admittance relay. 

Explain MHO relay in detail.

Description : Explain MHO relay in detail.

Last Answer : MHO Relay: In this relay, poles 1, 2, 3 are energized by a voltage V through polarizing coil to produce flux, the capacitor connected provides phase shift. The left pole 4 is energized by a current which is the ... hence on the ratio (I/V) = Y i.e. admittance, hence called as MHO relay.

Large internal faults are protected by (a) merz price percentage differential protection (b) mho and ohm relays (c) horn gaps and temperature relays (d) earth fault and positive sequence relays

Description : Large internal faults are protected by (a) merz price percentage differential protection (b) mho and ohm relays (c) horn gaps and temperature relays (d) earth fault and positive sequence relays

Last Answer : (a) merz price percentage differential protection

Draw a neat sketch of earth fault protection of auxiliary circuit of electric loco. State the function of relay and isolating resistance.

Description : Draw a neat sketch of earth fault protection of auxiliary circuit of electric loco. State the function of relay and isolating resistance.

Last Answer : Ans: Earth fault protection for auxiliaries in Loco: Function of relay: The earth fault occurring anywhere in the auxiliary circuit gets monitored by the relay which acts to trip the main CB. Function of ... star point to earth through a high resistance so that the relay operation is avoided.

A series resistance is added to the over-current relay in a bus bar differential protection scheme which:

Description : A series resistance is added to the over-current relay in a bus bar differential protection scheme which: a. Helps to develop some voltage across it which otherwise should appear across the relay and is ... the effects of CT saturation and lowers the pickup value of the relay d. All of the above 

Last Answer : A series resistance is added to the over-current relay in a bus bar differential protection scheme which: a. Helps to develop some voltage across it which otherwise should appear across the relay and is ... the effects of CT saturation and lowers the pickup value of the relay d. All of the above 

‘mho’ is the unit of which unit? -General Knowledge

Description : ‘mho’ is the unit of which unit? -General Knowledge

Last Answer : The answer is 'Specificresistance'

‘mho’ is the unit of which unit? -General Knowledge

Description : ‘mho’ is the unit of which unit? -General Knowledge

Last Answer : answer:

‘mho’ is the unit of which unit?

Description : ‘mho’ is the unit of which unit?

Last Answer : – Specific resistance

The unit to measure the flow of water is - (1) Micro Mho (2) Ohm meter (3) Milli curie (4) Cusecs

Description : The unit to measure the flow of water is - (1) Micro Mho (2) Ohm meter (3) Milli curie (4) Cusecs

Last Answer : (4) Cusecs Explanation: The unit to measure the flow of water is cusecs. Cusecs is short form of Cubic feet per second.

‘mho’ is the unit of which unit?

Description : ‘mho’ is the unit of which unit?

Last Answer : Specificresistance

Which quantity do the following units measure: (i) Volt (ii) Coulomb (iii) Walt (iv) Ohm (v) Mho (vi) Ampere (vii) Dyne (viii) Celsius (ix) Joule (x) Calorie

Description : Which quantity do the following units measure: (i) Volt (ii) Coulomb (iii) Walt (iv) Ohm (v) Mho (vi) Ampere (vii) Dyne (viii) Celsius (ix) Joule (x) Calorie

Last Answer : Answers: (i) Voltage (ii) Charge of Electricity (iii) Power (iv) Resistance (v) Conductivity (vi) Current (vii) Force (viii) Temperature (ix) Energy (x) Heat

The unit to measure the flow of water is (1) Micro Mho (2) Ohm meter (3) Milli curie (4) Cusecs

Description : The unit to measure the flow of water is (1) Micro Mho (2) Ohm meter (3) Milli curie (4) Cusecs

Last Answer : Cusecs

A material has conductivity of 10–2 mho/m and relative permittivity of 4. The frequency at which the

Description : A material has conductivity of 10–2 mho/m and relative permittivity of 4. The frequency at which the conduction current in the medium is equal to the displacement current, is (a) 450 MHz (b) 900 MHz (c) 45 MHz (d) 90 MHz

Last Answer : C

What are the different relays that employed for protection of apparatus and transmission lines?

Description : What are the different relays that employed for protection of apparatus and transmission lines?

Last Answer : Answer: The relays that are usually employed for protection of transmission lines include • Over current relay • Directional relay • Distance relay • Under Voltage relay • Under-frequency relay • Thermal relay • Differential relay • Phase sequence relays • pilot relays

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Description : The purpose of a magnetic relay is to _____________. A. open a circuit only in the event of overload B. remotely open and close contacts C. provide overcurrent protection during starting D. relay voltages at increased power

Last Answer : Answer: B

Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Description : Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Last Answer : Answer: B

State any four relays used for catenary protection. State function of each relay.

Description : State any four relays used for catenary protection. State function of each relay.

Last Answer : Relays Used for Catenary Protection: 1. MHO relay: Wrong coupling protection. 2. MHO relay: Over current protection at farthest point. 3. Over current relay: Over current protection against faults near substation 4. Under voltage relay: Protection against faults far away from substation. 

The transmission line distance protection relay having the property of being inherently directional is

Description : The transmission line distance protection relay having the property of being inherently directional is (A) impedance relay (B) MHO relay (C) OHM relay (D) reactance relay

Last Answer : The transmission line distance protection relay having the property of being inherently directional is MHO relay

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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 

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

Buchholz's relay gives warning and protection against?

Last Answer : Buchholz's relay gives warning and protection against electrical fault inside the transformer itself.

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Description : Fuse wire protection system is usually not used beyond: a. 10A b. 25A c. 50A d. 100A  

Last Answer : Fuse wire protection system is usually not used beyond: a. 10A b. 25A c. 50A d. 100A  

Capacity utilization - (1) is usually near 100 percent. (2) represents the percent of the labour force that is employed. (3) is a measure of the proportional of the existing capital stock used for current production. (4) rises as the economy moves into a recession, since firms must replace unemployed workers with some other resources to maintain production.

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Last Answer : (D) All of these

Capacity utilisation (1) is usually near 100 percent. (2) represents the percent of the labour force that is employed. (3) is a measure of the proportional of the existing capital stock used for current production. (4) rises as the economy moves into a recession, since firms must replace unemployed workers with some other resources to maintain production.

Description : Capacity utilisation (1) is usually near 100 percent. (2) represents the percent of the labour force that is employed. (3) is a measure of the proportional of the existing capital ... into a recession, since firms must replace unemployed workers with some other resources to maintain production.

Last Answer : is a measure of the proportional of the existing capital stock used for current production.

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Description : Which of the following statements is true? a. Annual can survive in the sever winter without protection. b. Annuals usually bloom only once each season. c. Annuals are only planted in spring. d. Annuals are only used for foliage beauty.

Last Answer : Annuals usually bloom only once each season

State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.

Description : State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.

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Explain magnetic effect employed in measuring instrument.

Description : Explain magnetic effect employed in measuring instrument.

Last Answer : Magnetic Effect:  I) In PMMC meters:  ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force.  Examples: Electrodynamometer type instruments, Induction type instrument. 

List any four effects employed in measuring instruments.

Description : List any four effects employed in measuring instruments.

Last Answer : Effects Employed in Measuring Instruments: 1. Magnetic Effect 2. Electromagnetic induction 3. Heating effect 4. Electrostatic effect 5. Hall Effect 

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Description : Two wattmeter method is employed to measure power in a 3 -phase balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A -phase line reads zero, then the power factor of the 3 -phase load will be

Last Answer : Two wattmeter method is employed to measure power in a 3 -phase balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A -phase line reads zero, then the power factor of the 3 -phase load will be 0.5 lagging.

A strain gauge is a passive transducer and is employed for converting

Description : A strain gauge is a passive transducer and is employed for converting   (a) Pressure into change in resistance (b) Force into displacement (c) Mechanical displacement into a change of resistance (d) None of the above 

Last Answer : A

main parts of Relay

Description : main parts of Relay

Last Answer : Coil, plunger, contacts, springs, connecting terminals and enclosure.

function of equipment’s used in sub-stations : (i) Earth Switch (ii) Relay (iii) Lighting Arrester (iv) Auxiliary transformer

Description : function of equipment’s used in sub-stations : (i) Earth Switch (ii) Relay (iii) Lighting Arrester (iv) Auxiliary transformer 

Last Answer : (i) Earth Switch   It's function is to discharge the ground capacitance when line is open circuited for maintenance purpose by isolator.) Earthing switch is inter - locked with isolator from the safety point ... 3-ph, 4wire, 400V) to give supply to control room, area lighting, staff quarters etc, 

Draw a neat labeled diagram to show protective system for AC traction and give the function of each relay used in it.

Description : Draw a neat labeled diagram to show protective system for AC traction and give the function of each relay used in it. 

Last Answer : Protective system for AC traction:  Function Of Each Relay: For transformer -  Inverse time over current relay- as back up protection on primary (HV side) over current ... against faults near substation  Under voltage relay - protection against faults far away from substation

For a traction transformer circuit breaker state: 1) Rated current and rupturing capacity 2) Any two tests it should be capable of withstanding 3) Overall tripping time and relay time.

Description : For a traction transformer circuit breaker state: 1) Rated current and rupturing capacity 2) Any two tests it should be capable of withstanding 3) Overall tripping time and relay time.

Last Answer : Ans: 1) Rated current --- 750 A and Rupturing capacity --- 500 MVA  2) Any two tests it should be capable of withstanding --- Breaking test , Reclosing test , Endurance test ( any two )  3) Overall tripping time --- 0.14 sec and Relay time --- 0.04 sec 

Explain the construction and working of electronic overload relay.

Description : Explain the construction and working of electronic overload relay.

Last Answer : Electronic overload relay consists of a solid state circuit that operates the electromagnetic switching device to protect the load from overload. The load current is sensed by using a current ... sections. The output of relay driver section sends trip signal to electromagnetic switching device.

Describe the operation of solid state relay.

Description : Describe the operation of solid state relay.

Last Answer : Solidstate relay is electronic equivalent of an electromechanical relay. It consists of controlled power semiconductor switch like triac. There are four terminals. Two are the power terminals for load and two control ... is turned ON. When triac is ON, the load is connected to AC supply

Buchholz relay is used as a safety device with respect to which of the following?

Description : Buchholz relay is used as a safety device with respect to which of the following? A) Audio transformers B) Oil filled power transformers C) Air core transformer D) None of these

Last Answer : Buchholz relay is used as a safety device with respect to which of the following? A) Audio transformers B) Oil filled power transformers C) Air core transformer D) None of these

The operating characteristics of a reactance type distance relay (A) a stepped waveform for increasing

Description : The operating characteristics of a reactance type distance relay (A) a stepped waveform for increasing reactance (B) a straight line for a constant reactance (C) a circle for a constant reactance (D) a set of circles for variable reactances

Last Answer : The operating characteristics of a reactance type distance relay a straight line for a constant reactance

In induction type directional over current relay the driving torque is due to interaction of magnetic fields

Description : In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from (A) current in the potential coil (B) both voltage and current in the ... (C) directional element and non-directional element (D) non-directional element and the trip circuit

Last Answer : In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from directional element and non-directional element

What is Relay?

Description : What is Relay? A. which transfer power B. opens or closes an auxiliary circuit C. used for short circuit only D. converts AC to DC 

Last Answer : opens or closes an auxiliary circuit

In a static over-current relay, inverse time characteristics are obtained by

Description : In a static over-current relay, inverse time characteristics are obtained by   (a) A differentiating circuit (b) An integrating circuit (c) A transistor amplifier (d) A transistor switch

Last Answer : B

what is reverse power relay?

Description : what is reverse power relay?

Last Answer : Thereverse powerrelay is a directional protective relay that prevents power from flowing in the reverse direction. Read our article going back ... it all to be up to date. And if you do, read it anyway just to check if youreallydo!

What is buchholz relay?

Last Answer : The buchholz relay is one type of relay which is used in the oil filled power transformerand is for the safety device .