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
Last Answer : 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
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300 views
1 answer
asked
May 8, 2018
by
anonymous

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
Last Answer : 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
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109 views
1 answer
asked
May 8, 2018
by
anonymous

Last Answer : Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.
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209 views
1 answer
asked
Mar 20, 2018
by
anonymous

The current zero interruption, in oil and air blast circuit breakers, is achieved by?
Last Answer : The current zero interruption, in oil and air blast circuit breakers, is achieved by lengthening of the gap, cooling and blast effect.
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438 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : Circuit breakers are essentially current carrying contacts called electrodes.
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327 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : Circuit breakers usually operate under transient state of short-circuit current.
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105 views
1 answer
asked
Mar 19, 2018
by
anonymous

Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above
Last Answer : Magnetic circuit breakers use Solenoid
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115 views
1 answer
asked
Apr 29, 2018
by
anonymous

What is the maximum number of circuit breakers in a panel?
Last Answer : It depends on that which type of panel is this.
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112 views
1 answer
asked
Mar 10, 2018
by
anonymous
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Define: 1) frequency, 2) cycle, 3) time period, 4) amplitude
Last Answer : 1) frequency: The total number of cycles completed in one second is called frequency. Its unit is cycles per second or Hertz (Hz). Its formula is f = 1/ T, where T is time period. ... is second per cycle. 4) amplitude: the maximum instantaneous value of sine wave is called as amplitude.
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384 views
2 answers
asked
Aug 8, 2018
by
anonymous

In otto cycle compression ratio is 8. Calculate air standard efficiency. Will it be grater than Carnot Cycle ? Justify your answer.
Last Answer : No, the Otto cycle efficiency 56.47% will always be lower than Carnot cycle efficiency. Justification: Carnot theorem states that keeping operating conditions same, Carnot engine is more efficient than any other engine. So, Otto cycle efficiency is lower than Carnot cycle efficiency.
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292 views
1 answer
asked
Jan 2, 2021
by
anonymous

With diagram explain bottoming cycle type of co-generation.
Last Answer : Bottoming cycle type of co-generation: i) Bottoming cycle of co-generation system is that in which high temperature heat energy is produced using primary fuels. ii) This heat produced is ... of the system greatly. vii) Bottoming cycles are suitable for cement industries, ceramic factories etc.
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121 views
1 answer
asked
Sep 29, 2018
by
anonymous

In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12
Last Answer : In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12
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192 views
1 answer
asked
Jun 18, 2018
by
anonymous

The rankine cycle efficiency of steam power plant is (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%
Last Answer : The rankine cycle efficiency of steam power plant is 30-45%
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111 views
1 answer
asked
Apr 29, 2018
by
anonymous

The use of regenerator in a gas turbine cycle (1) increases efficiency but has no effect on output (2) increases output but has no effect on efficiency (3) increases both efficiency and output (4) increases efficiency but decreases output
Last Answer : The use of regenerator in a gas turbine cycle increases efficiency but has no effect on output
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175 views
1 answer
asked
Apr 29, 2018
by
anonymous

Last Answer : It is denoted as τ, tau and has the value of 1/RC. We
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1 answer
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Time constant for RC circuit formula τ = RC Where, τ = time constant
Last Answer : Time constant for RC circuit formula τ = RC Where, τ = time constant
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130 views
1 answer
asked
Jul 2, 2019
by
anonymous

The time constant of a series R-C circuit is given by?
Last Answer : The time constant of a series R-C circuit is given by RC.
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210 views
1 answer
asked
Mar 25, 2018
by
anonymous
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Time constant of a capacitive circuit?
Last Answer : Time constant of a capacitive circuit increase with increase of capacitance and increase of resistance.
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73 views
1 answer
asked
Mar 25, 2018
by
anonymous

Time constant of a circuit is the time in seconds taken after the application of voltage to each?
Last Answer : Time constant of a circuit is the time in seconds taken after the application of voltage to each 63% of maximum value.
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106 views
1 answer
asked
Mar 25, 2018
by
anonymous

The time constant of the capacitance circuit is defined as the time during which voltage?
Last Answer : The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.
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183 views
1 answer
asked
Mar 25, 2018
by
anonymous

Time constant of an inductive circuit?
Last Answer : Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.
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99 views
1 answer
asked
Mar 25, 2018
by
anonymous

How easy is it to tell needs from wants if you reside in a land of plenty (such as the US, Canada, the UK or places with all the modern creature comforts)?
Last Answer : answer:I personally don't know of a person (rural Midwest) that gives a thought to their needs. Food, shelter and clothing are a given, it's the grade that they want that is in ... and nearly no one in the industrialized world appreciates what they have, or distinguish between want and need.
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1 answer
asked
Feb 28
by
anonymous

What modern invention would you uninvent?
Last Answer : Most plastic products, especially plastic bags. The irony is I work at a plastics resin factory.
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0 views
1 answer
asked
Feb 27
by
anonymous

Living without modern amenities?
Last Answer : I have lived without cell phones (have them right now). It was fine.
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0 views
1 answer
asked
Feb 27
by
anonymous

Modern cuisine - what is it like?
Last Answer : So that the hostess can feel great in her kitchen, so that nothing annoys her, and nothing bothers her, it is necessary to properly distribute the space. Conventionally, the kitchen is divided into four ... all the nuances of kitchen design, it can become a source of pride for the whole family.
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2 views
1 answer
asked
Mar 29, 2021
by
anonymous

What are the advantages and disadvantages of a modern candy bar?
Last Answer : What are the advantages and disadvantages of a modern candy bar? A monoblock is a computer in which a monitor and a system unit are combined in one case. Outwardly, it looks like ... modern monoblocks are equipped with a touchscreen, usually devices designed for home use have such functionality.
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9 views
1 answer
asked
Mar 28, 2021
by
anonymous

How to choose a modern stretch ceiling?
Last Answer : How to choose a modern stretch ceiling? Renovation in an apartment, which many consider to be quite messy and troublesome, today can be easily turned into a less dusty procedure. To do this ... , stretch ceilings from Swiss, Russian and Chinese manufacturers are in great demand on the market today.
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17 views
1 answer
asked
Mar 27, 2021
by
anonymous

why vlsi is important in modern days ?
Last Answer : Because the use of VLSI is increasing in modern days. Technology is getting advanced day by day. More and more features are adding in small chips.
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419 views
1 answer
asked
Aug 22, 2017
by
anonymous

The time of closing the cycle, in modern circuit breakers is (a) 0.003 sec (b) 0.001 sec (c) 0.01 sec (d) 0.10 sec (e) none of the above
Last Answer : (a) 0.003 sec
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1 answer
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What would you do if the electric is shut off??
Last Answer : I’ve got a Kindle. So I can still read. Or we play a game by candlelight. We sit and talk. If it’s night and I’m tired, I go to sleep.
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0 views
1 answer
asked
Mar 2
by
anonymous

Novels for 10-11th grade level with a female lead character.
Last Answer : Their Eyes Were Watching God. Not “current,” but certainly still relevant.
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0 views
1 answer
asked
Feb 27
by
anonymous

If the % reactance upto the fault point is 20%, then the short circuit current will be
Last Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current
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3.0k views
1 answer
asked
May 8, 2018
by
anonymous

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
Last Answer : The arc temperature in Oil Circuit Breaker may reach up to 5,000° K
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117 views
1 answer
asked
May 8, 2018
by
anonymous

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
Last Answer : The number of cycles in which a high speed circuit breaker can complete its operation is 3 to 8
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637 views
1 answer
asked
May 8, 2018
by
anonymous

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
Last Answer : 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
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106 views
1 answer
asked
May 8, 2018
by
anonymous

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
Last Answer : The Minimum Oil Circuit Breaker (MOCB) is named because of : Reduced requirement of oil
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163 views
1 answer
asked
May 8, 2018
by
anonymous

For selecting a circuit breaker, ______ should be determined. (A) initial current that flows on occurrence of a short circuit only (B) transient current that flows at the time of circuit interruption only (C) resonant frequency only (D) (A) and (B)
Last Answer : For selecting a circuit breaker, ______ should be determined. (A) initial current that flows on occurrence of a short circuit only (B) transient current that flows at the time of circuit interruption only (C) resonant frequency only (D) (A) and (B)
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78 views
1 answer
asked
Apr 30, 2018
by
anonymous

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
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83 views
1 answer
asked
Apr 26, 2018
by
anonymous

Last Answer : A fuse in a motor circuit provides protection against short-circuit and overload.
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157 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Arc in a circuit breaker is interrupted at zero current.
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84 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The short circuit in any winding of the transformer is the result of impulse voltage.
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174 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.
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317 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a circuit breaker the basic problem is to transmit large power.
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121 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Ionization in circuit breaker is facilitated by high temperature, increase of mean free path, increasing field strength.
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304 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 : Air blast circuit breaker is used for repeated duty.
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78 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : Magnetic circuit breaker has instantaneous trip action.
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217 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : Thermal circuit breaker has delayed trip action.
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154 views
1 answer
asked
Mar 19, 2018
by
anonymous

Arc in a circuit behaves as?
Last Answer : Arc in a circuit behaves as a resistance decreasing with voltage rise across the arc.
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284 views
1 answer
asked
Mar 19, 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
