The under voltage relay can be used for?

Question

asked Mar 20, 2018 by anonymous

45 views

Please log in or register to answer this question.

1 Answer

← Prev Question Next Question →

Related questions

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

0 like 0 dislike

234 views 1 answer

asked May 1, 2018 by anonymous

A negative sequence relay is used for protection of

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

0 like 0 dislike

454 views 1 answer

asked Mar 19, 2018 by anonymous

In order that current should flow without causing excessive heating or voltage drop, the relay contacts should?

Last answer: In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.

0 like 0 dislike

111 views 1 answer

asked Mar 22, 2018 by anonymous

The voltage used for suburban trains in D.C. system is usually?

Last answer: The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

0 like 0 dislike

64 views 1 answer

asked Apr 29, 2018 by anonymous

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Last answer: An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

0 like 0 dislike

262 views 1 answer

asked Apr 28, 2018 by anonymous

The frequencies and voltage used in Dielectric heating are

The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V

Last answer: The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV

0 like 0 dislike

87 views 1 answer

asked May 22, 2020 by anonymous

List standard voltage level used in India.

Last answer: Standard voltage level used in India: * Generation Voltage : 3.3KV, 6.6KV,11KV and 17.5 KV,21KV (Now a days generation voltage is in the range of 11KV- 33KV) * Primary Transmission voltage :- 220 ... voltages in India are 765 KV (750KV), 400KV, 220KV, 132KV, 110KV, 66KV, 33KV, 22KV, 11KV.

0 like 0 dislike

45 views 1 answer

asked Mar 10, 2018 by anonymous

What equipment is used to measure voltage?

Last answer: Voltmeter is used to measure voltage.

0 like 0 dislike

178 views 2 answers

asked May 7, 2020 by anonymous

State the type of insulating materials under Class Y and Class B.

Last answer: The type of insulating materials under Class Y : 1. Cotton 2. Silk 3. Paper 4. Rubber 5. PVC The type of insulating materials under Class B: 1. Backelite 2. Impregnated varnish 3. Mica 4. Fiber glass 5. Asbestos

0 like 0 dislike

53 views 1 answer

asked Apr 29, 2018 by anonymous

Reactance relay is normally preferred for protection against

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

0 like 0 dislike

72 views 1 answer

asked Mar 20, 2018 by anonymous

Which relay is preferred for phase fault on short transmission line?

Last answer: Reactance relay is preferred for phase fault on short transmission line.

0 like 0 dislike

91 views 1 answer

asked Mar 19, 2018 by anonymous

A Buchholz relay can be installed on?

Last answer: A Buchholz relay can be installed on oil cooled transformers.

0 like 0 dislike

51 views 1 answer

asked May 8, 2018 by anonymous

The purpose of the restraining coil in a biased differential relay is

The purpose of the restraining coil in a biased differential relay is (A) To reduce CT saturation during fault. (B) To increase the sensitivity of the relay. (C) To match the transformation ratio. (D) To limit the spill current through the relay during heavy external fault.

Last answer: d

0 like 0 dislike

523 views 2 answers

asked May 3, 2018 by anonymous

The operating time of instantaneous relay is

Last answer: The operating time of instantaneous relay is 0.1 sec

0 like 0 dislike

91 views 1 answer

asked May 2, 2018 by anonymous

What is the difference between relay and contactor?

Last answer: Relay have smaller ratings. Contactor is a high rating relay.

0 like 0 dislike

5.0k views 1 answer

asked Apr 29, 2018 by anonymous

To prevent mal-operation of differentially connected relay while energizing a transformer, the relay

To prevent mal-operation of differentially connected relay while energizing a transformer, the relay restraining coil is based with (1) second harmonic current (2) third harmonic current (3) fifth harmonic current (4) seventh harmonic current

Last answer: To prevent mal-operation of differentially connected relay while energizing a transformer, the relay restraining coil is based with second harmonic current

0 like 0 dislike

248 views 1 answer

asked Apr 28, 2018 by anonymous

In the induction type directional over current relay, when a short-circuit occurs in the circuit

In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Last answer: In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

0 like 0 dislike

76 views 1 answer

asked Mar 20, 2018 by anonymous

The torque produced in induction type relay (shaded pole structure) is?

Last answer: The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.

0 like 0 dislike

580 views 1 answer

asked Mar 20, 2018 by anonymous

The relay with inverse time characteristic will operate within?

Last answer: The relay with inverse time characteristic will operate within 5 to 10 sec.

0 like 0 dislike

78 views 1 answer

asked Mar 19, 2018 by anonymous

A differential relay measures the vector difference between?

Last answer: A differential relay measures the vector difference between two or more similar electrical quantities.

0 like 0 dislike

118 views 1 answer

asked Mar 19, 2018 by anonymous

Burden of a protective relay is the power?

Last answer: Burden of a protective relay is the power absorbed by the circuit of relay.

0 like 0 dislike

614 views 1 answer

asked Mar 19, 2018 by anonymous

The relay operating speed depends upon?

Last answer: The relay operating speed depends upon the spring tension, the rate of flux built up, armature core air gap.

0 like 0 dislike

195 views 1 answer

asked Dec 17, 2017 by anonymous

What is the use of Buchholz relay in transformer?

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

1 like 0 dislike

119 views 1 answer

asked Dec 17, 2017 by anonymous

What is the difference between a switch and a relay?

Last answer: Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .

0 like 0 dislike

89 views 1 answer

asked May 3, 2018 by anonymous

A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply

A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply circuit through a C.T. 400/5 ratio. The fault current is 4000 A. The operating current of the relay is

Last answer: A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply circuit through a C.T. 400/5 ratio. The fault current is 4000 A. The operating current of the relay is 6.25A

0 like 0 dislike

413 views 1 answer

asked Apr 30, 2018 by anonymous

Buchholz relay is

Buchholz relay is (1) located in the conservator tank (2) located in the transformer tank itself (3) connected in the pipe connecting main tank of transformer and conservator (4) installed in the circuit breaker

Last answer: Buchholz relay is connected in the pipe connecting main tank of transformer and conservator

0 like 0 dislike

58 views 1 answer

asked Apr 28, 2018 by anonymous

A solid state relay

A solid state relay (A) withstands voltage transients (B) does not require auxiliary dc supply (C) provide low burden on CT and P (D) does not provide earth fault protection

Last answer: A solid state relay provide low burden on CT and P

0 like 0 dislike

43 views 1 answer

asked Mar 20, 2018 by anonymous

Admittance relay is _______ relay.

Last answer: Admittance relay is directional relay.

0 like 0 dislike

129 views 1 answer

asked Mar 20, 2018 by anonymous

Induction cup relay is operated due to changes in?

Last answer: Induction cup relay is operated due to changes in current, voltage, impedance.

0 like 0 dislike

174 views 1 answer

asked Mar 20, 2018 by anonymous

Interruption of large currents by relay requires?

Last answer: Interruption of large currents by relay requires arc suppressing blow out coils, wide separation of the opened contacts, high speed opening of contacts.

0 like 0 dislike

57 views 1 answer

asked Mar 20, 2018 by anonymous

Overheating of relay contacts or contact born out is due to?

Last answer: Overheating of relay contacts or contact born out is due to slow making and breaking of load circuit contacts, foreign matter on the contact surface, too low contact pressure.

0 like 0 dislike

92 views 1 answer

asked Dec 30, 2017 by anonymous

How do relay works ?

Last answer: Relay working like contact it is noise less

2 like 0 dislike

102 views 1 answer

asked May 8, 2018 by anonymous

The voltage of transmission can be regulated by

The voltage of transmission can be regulated by (A) Use of tap changing transformers (B) Switching in shunt capacitors at the receiving end during heavy loads (C) Use of capacitors to neutralize the effect of series reactance (D) Any of the above methods

Last answer: The voltage of transmission can be regulated by (A) Use of tap changing transformers (B) Switching in shunt capacitors at the receiving end during heavy loads (C) Use of capacitors to neutralize the effect of series reactance (D) Any of the above methods

0 like 0 dislike

59 views 1 answer

asked Apr 29, 2018 by anonymous

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

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

0 like 0 dislike

75 views 1 answer

asked Jun 18, 2018 by anonymous

Which of the following thyristors can be used for high frequency of operation?

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO

Last answer: Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO

0 like 0 dislike

81 views 1 answer

asked Mar 20, 2018 by anonymous

A shaded pole motor can be used for?

Last answer: A shaded pole motor can be used for toys, hair dryers, circulators etc.

0 like 0 dislike

75 views 1 answer

asked Apr 28, 2018 by anonymous

A network is said to be under resonance when the voltage and the current at the network input terminals are

A network is said to be under resonance when the voltage and the current at the network input terminals are (A) in phase (B) out of phase (C) in phase quadrature (D) in phase, and have equal magnitudes

Last answer: A network is said to be under resonance when the voltage and the current at the network input terminals are in phase

0 like 0 dislike

64 views 1 answer

asked Mar 20, 2018 by anonymous

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to?

Last answer: The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

0 like 0 dislike

136 views 1 answer

asked Mar 20, 2018 by anonymous

The material used for fuse must have?

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

0 like 0 dislike

130 views 1 answer

asked Mar 20, 2018 by anonymous

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.

0 like 0 dislike

2.5k 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.

0 like 0 dislike

136 views 1 answer

asked May 8, 2018 by anonymous

Earthing switch is used for?

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

0 like 0 dislike

63 views 1 answer

asked Apr 26, 2018 by anonymous

Regulating-transformers are used in power systems for control of

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

0 like 0 dislike

119 views 1 answer

asked Apr 26, 2018 by anonymous

Surge absorbers are used for protection against

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

0 like 0 dislike

2.9k views 1 answer

asked Mar 20, 2018 by anonymous

A switchgear is device used for?

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

0 like 0 dislike

229 views 1 answer

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.

0 like 0 dislike

60 views 1 answer

asked Mar 19, 2018 by anonymous

Air blast circuit breaker is used for?

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

0 like 0 dislike

58 views 1 answer

asked Apr 27, 2018 by anonymous

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

Last answer: For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25

0 like 0 dislike

1.8k views 1 answer

asked Apr 30, 2018 by anonymous

Which of the following gates can be used to realize all possible combinational logic functions?

Which of the following gates can be used to realize all possible combinational logic functions? (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate (A) (iii), (iv) and (v) (B) (i), (iii) and (iv) (C) (ii) and (iv) (D) (i) and (v)

Last answer: Which of the following gates can be used to realize all possible combinational logic functions? (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate (A) (iii), (iv) and (v) (B) (i), (iii) and (iv) (C) (ii) and (iv) (D) (i) and (v)

0 like 0 dislike

83 views 1 answer

asked Apr 29, 2018 by anonymous

Which of the following can be used to measure the capacitance of a capacitor?

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Last answer: Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

0 like 0 dislike

2.7k views 1 answer

anonymous · Answer 1 · 2018-03-20T02:33:54+0000

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

The under voltage relay can be used for?

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

Please log in or register to add a comment.

Related questions