The time of closing the cycle, in modern circuit breakers is?

The time of closing the cycle, in modern circuit breakers is 0.003 sec.

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Answer : Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

Description : The current zero interruption, in oil and air blast circuit breakers, is achieved by?

Answer : The current zero interruption, in oil and air blast circuit breakers, is achieved by lengthening of the gap, cooling and blast effect.

Description : 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

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

Description : 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

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

Answer : Circuit breakers are essentially current carrying contacts called electrodes.

Answer : Circuit breakers usually operate under transient state of short-circuit current.

Description : Define: 1) frequency, 2) cycle, 3) time period, 4) amplitude

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.

Description : What is the maximum number of circuit breakers in a panel?

Answer : It depends on that which type of panel is this.

Description : Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above

Answer : Magnetic circuit breakers use Solenoid

Description : Time constant of a circuit is the time in seconds taken after the application of voltage to each?

Answer : Time constant of a circuit is the time in seconds taken after the application of voltage to each 63% of maximum value.

Answer : It is denoted as τ, tau and has the value of 1/RC. We

Description : Time constant for RC circuit formula τ = RC Where, τ = time constant

Answer : Time constant for RC circuit formula τ = RC Where, τ = time constant

Description : The time constant of a series R-C circuit is given by?

Answer : The time constant of a series R-C circuit is given by RC.

Description : Time constant of a capacitive circuit?

Answer : Time constant of a capacitive circuit increase with increase of capacitance and increase of resistance.

Description : The time constant of the capacitance circuit is defined as the time during which voltage?

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.

Description : Time constant of an inductive circuit?

Answer : Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.

Description : why vlsi is important in modern days ?

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.

Description : Modern cuisine - what is it like?

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.

Description : What are the advantages and disadvantages of a modern candy bar?

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.

Description : How to choose a modern stretch ceiling?

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.

Description : In otto cycle compression ratio is 8. Calculate air standard efficiency. Will it be grater than Carnot Cycle ? Justify your answer.

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.

Description : 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

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

Description : 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

Answer : The use of regenerator in a gas turbine cycle increases efficiency but has no effect on output

Description : With diagram explain bottoming cycle type of co-generation.

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.

Description : The rankine cycle efficiency of steam power plant is  (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%

Answer : The rankine cycle efficiency of steam power plant is 30-45%

Description : The operating time of instantaneous relay is

Answer : The operating time of instantaneous relay is 0.1 sec

Description : With fault clearing time, the transient stability of a power system

Answer : With fault clearing time, the transient stability of a power system decreases

Description : ln HRC fuse the time between cut-off and final current zero is called

Answer : ln HRC fuse the time between cut-off and final current zero is called the arcing time

Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

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

Description : 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

Answer : The arc temperature in Oil Circuit Breaker may reach up to 5,000° K

Description : 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

Answer : The number of cycles in which a high speed circuit breaker can complete its operation is 3 to 8

Answer : A fuse in a motor circuit provides protection against short-circuit and overload.

Answer : Arc in a circuit breaker is interrupted at zero current.

Answer : The short circuit in any winding of the transformer is the result of impulse voltage.

Answer : The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.

Answer : In a circuit breaker the basic problem is to transmit large power.

Answer : Ionization in circuit breaker is facilitated by high temperature, increase of mean free path, increasing field strength.

Description : Arc in a circuit behaves as?

Answer : Arc in a circuit behaves as a resistance decreasing with voltage rise across the arc.

Answer : The arcing contacts in a circuit breaker are made of copper tungsten alloy.

Description : In which fault the maximum short circuit current occurs?

Answer : In three phase bolted fault the maximum short circuit occurs.

Description : What is Time of Day tariff? How it help in energy conservation?

Answer : Time-off-day tariff:- In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff /also the tariff in which P.F. of industrial consumer is taken ... the rated load for longer times of the day their overall efficiency gets higher helping to conserve energy.

Description : The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as A) Turnaround time B) Latency time C) Access time D) Response time

Answer : The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as Access time

Description : The time base signal in Cathode Ray Oscilloscope (CRO) is  (1) A square wave signal (2) A sawtooth signal (3) A triangular wave signal (4) A sinusoidal signal

Description : In electric traction for a trapezoidal speed-time curve, the time period is (A) free running speed period = constant speed period (B) free running period = coasting period (C) free running period + coasting period = constant speed period (D) average speed period = scheduled speed period

Answer : In electric traction for a trapezoidal speed-time curve, the time period is free running period + coasting period = constant speed period

Description : The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

Answer : The time period of third harmonic of power supply frequency, in milliseconds, is 6.66

Answer : Integrating instruments are those which measure the total quantity of electricity delivered in a particular time.

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

Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current

Description : 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

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

Description : 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

Answer : The Minimum Oil Circuit Breaker (MOCB) is named because of : Reduced requirement of oil

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