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.
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152 views
1 answer
asked
Mar 19, 2018
by
anonymous
What can I do about my Chevrolet 4.3 v6 engine overheating?
Last Answer : answer:Overheating problems are usually fairly easy to diagnose and I would think if your dad is the owner of a 100 year old truck, he knows how to spin a wrench. I would assume he either didnt ... usually ID that if there is fluid leaking from the heads or the rad fluid is spotty or milky.
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0 views
1 answer
asked
Feb 14
by
anonymous
Part of the transformer which is most subject to damage from overheating is?
Last Answer : Part of the transformer which is most subject to damage from overheating is winding insulation.
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146 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : Induction cup relay is operated due to changes in current, voltage, impedance.
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352 views
1 answer
asked
Mar 20, 2018
by
anonymous
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
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700 views
2 answers
asked
May 8, 2018
by
anonymous
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
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547 views
2 answers
asked
May 8, 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 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
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728 views
1 answer
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
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117 views
1 answer
asked
May 3, 2018
by
anonymous
What is the difference between relay and contactor?
Last Answer : Relay have smaller ratings. Contactor is a high rating relay.
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5.1k views
1 answer
asked
May 2, 2018
by
anonymous
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
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627 views
1 answer
asked
May 1, 2018
by
anonymous
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
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117 views
1 answer
asked
Apr 30, 2018
by
anonymous
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
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495 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
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120 views
1 answer
asked
Apr 29, 2018
by
anonymous
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
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123 views
1 answer
asked
Apr 28, 2018
by
anonymous
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
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68 views
1 answer
asked
Apr 28, 2018
by
anonymous
Last Answer : The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.
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829 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Admittance relay is directional relay.
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153 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The relay with inverse time characteristic will operate within 5 to 10 sec.
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115 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The under voltage relay can be used for generators, busbars, transformers, motors.
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68 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Reactance relay is preferred for phase fault on short transmission line.
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110 views
1 answer
asked
Mar 20, 2018
by
anonymous
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.
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95 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : A differential relay measures the vector difference between two or more similar electrical quantities.
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159 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : Burden of a protective relay is the power absorbed by the circuit of relay.
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810 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : The relay operating speed depends upon the spring tension, the rate of flux built up, armature core air gap.
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270 views
1 answer
asked
Mar 19, 2018
by
anonymous
How do relay works ?
Last Answer : Relay working like contact it is noise less
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134 views
1 answer
asked
Dec 30, 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.
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152 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 .
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110 views
1 answer
asked
Dec 17, 2017
by
anonymous
Overheating of relay contacts or contact born out is due to (a) slow making and breaking of load circuit contacts (b) foreign matter on the contact surface (c) too low contact pressure (d) all of the above
Last Answer : (d) all of the above
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17 views
1 answer
How to Put in Contact Lenses
Last Answer : How to Put in Contact Lenses Glasses give you clear vision, but if you don't like the weight they put on your face or how you look while wearing them, one great alternative is to use contact ... on contact lenses correctly. Just follow these tips carefully and you'll have the 20/20 vision you need.
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1 view
1 answer
How not to be mistaken when choosing contact lenses?
Last Answer : How not to be mistaken when choosing contact lenses? Contact lenses are currently the most common means of correcting vision. Now on the market there are a huge number of models of contact ... is better to choose products for sensitive eyes, which will avoid the occurrence of allergic reactions.
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2 views
1 answer
asked
Mar 28, 2021
by
anonymous
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.
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177 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.
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419 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The arcing contacts in a circuit breaker are made of copper tungsten alloy.
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116 views
1 answer
asked
Mar 19, 2018
by
anonymous
Can I store my contacts overnight (just this once) in something besides contact solution?
Last Answer : Nope. Don’t think so. Possibly distilled water but you need to confirm. You probably need to run to the store for some saline.
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1 view
1 answer
asked
Feb 14
by
anonymous
Does the Federal Witness Program work?
Last Answer : answer:To know if something works requires one to know of examples of something not working. I can scarcely think of one example where the federal witness program failed, except in the movies. By that ... , there are approximately 17,000 people in the program. http://www.msnbc.msn.com/id/7184047/
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0 views
1 answer
asked
Feb 27
by
anonymous
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I'm not sure if my head gasket it blown but will adding sealant just to make sure hurt it in anyway?
Last Answer : Check the radiator; make sure that’s working. Check oil and antifreeze levels. Make sure there are no leaks. Check fans.
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0 views
1 answer
asked
Feb 27
by
anonymous
Why would my 96 Ford Contour GL have no heat, and overheat after about 30 minutes?
Last Answer : If the heater core is blocked, you’re not getting the circulation you think you are, and nor have you bled the system, because there will still be trapped air. Can you rig a temp hose and bypass the heater core? (As opposed to taking the car to a dealer) and see if that’s the problem?
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0 views
1 answer
asked
Feb 27
by
anonymous
Fuel Pump Relay
Last Answer : Some car owners immediately suspect a fuel pump failure when their cars stall. However, there are many other engine problems that may resemble a fuel pump failure, such as restricted fuel filters, smashed ... advisable to bring your car to the repair shop so that the whole engine can be checked.
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10 views
1 answer
asked
May 5, 2021
by
anonymous
main parts of Relay
Last Answer : Coil, plunger, contacts, springs, connecting terminals and enclosure.
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70 views
1 answer
asked
Aug 28, 2019
by
anonymous
What is phase failure relay and how it's work?
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60 views
0 answers
asked
Aug 12, 2019
by
anonymous
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
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106 views
1 answer
asked
Apr 29, 2018
by
anonymous
A reactance relay is (A) Voltage restrained directional relay (B) Directional restrained over-current relay (C) Voltage restrained over current relay (D) Directional restrained over voltage relay
Last Answer : A reactance relay is Directional restrained over-current relay
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147 views
1 answer
asked
Apr 28, 2018
by
anonymous
Last Answer : A Buchholz relay can be installed on oil cooled transformers.
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70 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : Buchholz's relay gives warning and protection against electrical fault inside the transformer itself.
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107 views
1 answer
asked
Mar 19, 2018
by
anonymous
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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!
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62 views
1 answer
asked
Dec 4, 2017
by
anonymous
During its operation, loud buzzing and resultant welding of contacts of a magnetic relay may be caused by __________. A. overheating of the contactor coil B. low voltage on the operating coil C. low insulation resistance to ground D. lubrication of the contact bearing points
Last Answer : Answer: B
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2 views
1 answer
What is the most unusual email address you have in your email contacts?
Last Answer : Moderately sexy ninja.
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1 view
1 answer
asked
Mar 2
by
anonymous
How would you recommend I transfer all my contacts from an LG phone to iPhone?
Last Answer : answer:You should be able to export your contacts as a .csv file. If the iPhone doesn’t understand that, then everything I’ve ever suspected about Apple is true.
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1 view
1 answer
asked
Feb 28
by
anonymous
How to put contacts in for the persistent blinker?
Last Answer : I put the contact on my right index finger, then with my left hand pull my upper eyelid up and with my right middle finger pull my lower eyelid down, then insert. You’re gonna keep trying to blink, the key is to pull your eyelids apart far enough that it doesn’t matter.
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1 view
1 answer
asked
Feb 27
by
anonymous
How should contacts feel after the second day of wearing?
Last Answer : Call the doctor’s office and describe what is happening.
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1 view
1 answer
asked
Feb 27
by
anonymous
