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Which design method is based on state space approach?

Recent questions and answers in Switchgear And Protection

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1 answer 110 views

The reactance relay is essentially: A) an over-voltage relay with current restraint B) an over-voltage relay with directional restraint C) a directional relay with voltage restraint D) a directional relay with current restraint 

answered Jun 24, 2018 in Switchgear And Protection
1 answer 29 views

 For the protection of parallel feeders fed from one end, the relays used are: A) non-directional relays at the source-end and directional relays at the load-end B) non-directional relays at both the ends C) directional relays at the source-end and non-directional at the load-end D) directional relays at both the ends

answered Jun 17, 2018 in Switchgear And Protection
1 answer 165 views

Which type of protection is provided on a generator to protect against stator insulation failure? A) Differential protection B) Overcurrent relay C) Thermocouple actuated alarm D) Reverse power relay

answered Jun 17, 2018 in Switchgear And Protection
2 answers 54 views

The operation of the relay which is most affected due to arc resistance is A) Mho relay B) Reactance relay C) Impedance relay D) All are equally affected

answered Jun 17, 2018 in Switchgear And Protection
1 answer 42 views

For complete protection of a three-phase line: A) three Phase relays and three Earth fault relays are required B) three Phase relays and two Earth fault relays are required C) two Phase relays and two Earth fault relays are required D) two Phase relays and one Earth fault relay are required

answered Jun 17, 2018 in Switchgear And Protection
1 answer 29 views

The burden value in Potential Transformer (PT) should be ______ to achieve low errors in PT: A) low B) high C) medium D) infinite

answered Jun 17, 2018 in Switchgear And Protection
0 answers 17 views

Ratio relay by using line-to-neutral voltage protect (A) 3-phase faults (B) double line faults (C) double-line-to-ground faults (D) generator bus earth faults 

asked Jun 4, 2018 in Switchgear And Protection
0 answers 55 views

Protection of transformer from all types of faults is by using (A) over current relay (B) differential relay (C) distance relay (D) Buchholz relay

asked Jun 4, 2018 in Switchgear And Protection
1 answer 28 views

With which of the following, a circuit breaker must be equipped for remote operation ? (a) Inverse time trip (b) Time-delay trip (c) Shunt trip  (d) None of the above (e) All of the above

answered May 26, 2018 in Switchgear And Protection
1 answer 26 views

Which of the following medium is employed for extinction of arc in air circuit breaker ? (a) Water  (b) Oil (c) Air  (d) SF6

answered May 26, 2018 in Switchgear And Protection
1 answer 23 views

On which of the following routine tests are conducted ? (a) Oil circuit breakers (b) Air blast circuit breakers (c) Minimum oil circuit breakers (d) All of the above

answered May 26, 2018 in Switchgear And Protection
0 answers 22 views

An IDMT relay of rating 5A, 2.2s and having a relay setting of 125% is connected to a supply circuit through a CT having a ratio of 400/5. The plug setting multiplier of IDMT relay in the event of fault current of 4000 A will be a. 5 b. 8 c. 10 d. 125

asked May 24, 2018 in Switchgear And Protection
1 answer 19 views

A loss of excitation protection scheme for large generating unit employs A) under frequency relays B) offset Mho relay C) reactance relay D) percentage differential relay

answered May 24, 2018 in Switchgear And Protection
1 answer 16 views

The most efficient torque — producing actuating structure for induction — type relay is:

answered May 22, 2018 in Switchgear And Protection
1 answer 21 views

For complete protection ofa 3— phase line: (1) Three phase and three—earth fault relays are required (2) Three phase and two—earth fault relays are required (3) Two phase and two—earth fault relays are required (4) Two phase and one-earth fault relays are required

answered May 22, 2018 in Switchgear And Protection
1 answer 69 views

In a biased differential relay, the bias is defined as the ratio of  A) Number of turns of restraining coil and operating coil B) Operating coil current and restraining coil current C) Faulteurrent and operating coil current D) Fault current and restraining coil current

answered May 20, 2018 in Switchgear And Protection
1 answer 16 views

Electrical contact materials used in switches, brushes and relays must possess   (A) high thermal conductivity and high melting point  (B) Low thermal conductivity and low melting point   (C) High thermal conductivity and low melting point  (D) Low thermal conductivity and high melting point.

answered May 16, 2018 in Switchgear And Protection
1 answer 39 views

The burden of protective Current Transformer (CT) is specified in

answered May 15, 2018 in Switchgear And Protection
1 answer 25 views

Earth Leakage circuit breaker (ELCB) works on the basis of

answered May 15, 2018 in Switchgear And Protection
1 answer 12 views

In order to quench the are quickly and also optimize the dimensions generally   (a) Air blast C.B. is preferred (b) Oil C.B. is preferred (c) SF6 C.B. is preferred (d) Minimum oil C.B. is preferred  

answered May 13, 2018 in Switchgear And Protection
1 answer 14 views

Zero-sequence current is used for relaying purpose only in the case of   (a) Phase over current relay (b) Phase impedance relay (c) Ground over current relay (d) Ground impedance relay

answered May 13, 2018 in Switchgear And Protection
1 answer 29 views

The RRRV depends upon

answered May 13, 2018 in Switchgear And Protection
1 answer 11 views

Making capacity of the circuit breaker depends on (A) operating voltage (B) short circuit MVA (C) fault current (D) All of the above

answered May 13, 2018 in Switchgear And Protection
1 answer 22 views

30°, 60° and 90° connections are made in a directional relay to render the relay (A) Sufficient torque under fault conditions (B) Zero torque under fault conditions (C) Current grading (D) Time grading

answered May 12, 2018 in Switchgear And Protection
1 answer 20 views

The type of backup protection scheme widely used in the field is (A) Relay backup (B) Breaker backup (C) Remote backup (D) Auxiliary backup

answered May 12, 2018 in Switchgear And Protection
1 answer 37 views

In order to reduce the voltage surges due to current chopping and capacitive current breaking, we connect (A) A resistor across the CB contacts. (B) A capacitor across the CB contacts. (C) An inductor across the CB contacts. (D) A switch across the CB contacts

answered May 12, 2018 in Switchgear And Protection
1 answer 11 views

If a relay fails to operate for a fault within its reach, it is said to

answered May 12, 2018 in Switchgear And Protection
1 answer 24 views

Which relay is more sensitive ? 1 VA or 2 VA ? (A) 1 VA (B) 2 VA (C) Both are equally sensitive (D) Both are insensitive

answered May 12, 2018 in Switchgear And Protection
1 answer 12 views

If the spacing between the conductors increases, the corona effect

answered May 12, 2018 in Switchgear And Protection
1 answer 19 views

Reactance relays are employed for Phase faults in : (A) Short lines (B) Medium lines (C) Long lines (D) Any line

answered May 12, 2018 in Switchgear And Protection
1 answer 42 views

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.

answered May 8, 2018 in Switchgear And Protection
1 answer 24 views
1 answer 22 views
1 answer 21 views

Blind spot is a point in the zones of protection where

answered May 8, 2018 in Switchgear And Protection
1 answer 29 views

If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be

answered May 8, 2018 in Switchgear And Protection
1 answer 43 views

If the % reactance upto the fault point is 20%, then the short circuit current will be

answered May 8, 2018 in Switchgear And Protection
1 answer 21 views

The arc temperature in Oil Circuit Breaker may reach up to_______.  (A) 5,000° K (B) 8,000° K (C) 10,000° K (D) None of the above

answered May 8, 2018 in Switchgear And Protection
1 answer 27 views

Which of the following is not a part of transformer installation?  (A) Conservator (B) Breather (C) Buchholz Relay (D) Exciter

answered May 8, 2018 in Switchgear And Protection
1 answer 36 views

Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB 

answered May 8, 2018 in Switchgear And Protection
1 answer 23 views

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

answered May 8, 2018 in Switchgear And Protection
1 answer 35 views

A fuse wire should have :  (A) Low specific resistance and high melting point (B) Low specific resistance and low melting point (C) High specific resistance and high melting point (D) High specific resistance and low melting point

answered May 8, 2018 in Switchgear And Protection
1 answer 19 views

The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

answered May 8, 2018 in Switchgear And Protection
1 answer 20 views

The core construction is like spokes of a wheel in following transformer:  (A) Berry Type Transformer (B) Core Type Transformer (C) Shell Type Transformer (D) None of the above

answered May 8, 2018 in Switchgear And Protection
1 answer 73 views

The number of cycles in which a high speed circuit breaker can complete its operation is  (A) 3 to 8 (B) 10 to 18 (C) 20 to 30 (D) 40 to 50

answered May 8, 2018 in Switchgear And Protection
1 answer 26 views

A circuit breaker is designed to protect an electrical circuit from damage caused by :  (A) Over load (B) Short circuit (C) Over current (D) All of the above

answered May 8, 2018 in Switchgear And Protection
1 answer 23 views

Capacitance is the ability of a body to store an__________.  (A) electrical charge (B) electric current (C) voltage (D) All of the above

answered May 8, 2018 in Switchgear And Protection
1 answer 53 views

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

answered May 8, 2018 in Switchgear And Protection
1 answer 18 views

Isolator in substation is open under ___________ condition?  (A) No load (B) Short circuit (C) Full load (D) None of the above

answered May 8, 2018 in Switchgear And Protection
1 answer 34 views

The Minimum Oil Circuit Breaker (MOCB) is named because of :  (A) Reduced requirement of oil (B) Reduced requirement of air (C) All of the above (D) None of the above

answered May 8, 2018 in Switchgear And Protection
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