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Thermal circuit breaker has?
asked
Mar 19, 2018
by
anonymous
thermal
circuit
breaker
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1
Answer
answered
Mar 19, 2018
by
anonymous
Thermal circuit breaker has
delayed trip action.
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asked
Mar 19, 2018
by
anonymous
Magnetic circuit breaker has ______ trip action.
Last answer:
Magnetic circuit breaker has instantaneous trip action.
magnetic
circuit
breaker
trip
action
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1
answer
asked
May 8, 2018
by
anonymous
The arc temperature in Oil Circuit Breaker may reach up to_______.
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
arc
temperature
oil
circuit
breaker
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1
answer
asked
May 8, 2018
by
anonymous
The number of cycles in which a high speed circuit breaker can complete its operation is
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
cycles
high
speed
circuit
breaker
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1
answer
asked
May 8, 2018
by
anonymous
A circuit breaker is designed to protect an electrical circuit from damage caused by :
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
circuit
breaker
designed
protect
electrical
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1
answer
asked
May 8, 2018
by
anonymous
The Minimum Oil Circuit Breaker (MOCB) is named because of :
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
minimum
oil
circuit
breaker
mocb
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1
answer
asked
Apr 30, 2018
by
anonymous
For selecting a circuit breaker, ______ should be determined.
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)
circuit
breaker
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1
answer
asked
Apr 26, 2018
by
anonymous
ln a minimum oil circuit breaker the oil is used
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
minimum
oil
circuit
breaker
used
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63
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1
answer
asked
Mar 20, 2018
by
anonymous
Arc in a circuit breaker is interrupted at?
Last answer:
Arc in a circuit breaker is interrupted at zero current.
arc
circuit
breaker
interrupted
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1
answer
asked
Mar 20, 2018
by
anonymous
The arc voltage produced in A.C. circuit breaker is always?
Last answer:
The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.
arc
voltage
circuit
breaker
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1
answer
asked
Mar 20, 2018
by
anonymous
In a circuit breaker the basic problem is to?
Last answer:
In a circuit breaker the basic problem is to transmit large power.
circuit
breaker
basic
problem
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103
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1
answer
asked
Mar 20, 2018
by
anonymous
Ionization in circuit breaker is facilitated by?
Last answer:
Ionization in circuit breaker is facilitated by high temperature, increase of mean free path, increasing field strength.
ionization
circuit
breaker
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1
answer
asked
Mar 20, 2018
by
anonymous
The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.
Last answer:
The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.
voltage
appearing
contacts
circuit
breaker
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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.
air
blast
circuit
breaker
used
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1
answer
asked
Mar 19, 2018
by
anonymous
The arcing contacts in a circuit breaker are made of?
Last answer:
The arcing contacts in a circuit breaker are made of copper tungsten alloy.
arcing
contacts
circuit
breaker
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1
answer
asked
Dec 4, 2017
by
anonymous
what is SF6 circuit breaker?
what is SF6 circuit breaker?
Last answer:
A circuit breaker in which SF6 under pressure gas is used toextinguish the arc is calledSF6 circuit breaker. SF6 (sulphur hexafluoride) gas has excellent dielectric , arc quenching, chemical and other physical properties and has proved its ...
sf6
circuit
breaker
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1
answer
asked
May 21, 2020
by
anonymous
Explain working of static AC circuit breaker.
Explain working of static AC circuit breaker.
Last answer:
Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.
working
static
ac
circuit
breaker
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1
answer
asked
Oct 13, 2019
by
anonymous
Explain working of AC circuit breaker using SCR with circuit diagram.
Explain working of AC circuit breaker using SCR with circuit diagram.
Last answer:
AC Circuit Breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.
working
ac
circuit
breaker
scr
diagram
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1
answer
asked
Sep 18, 2018
by
anonymous
State function of starter and ELCB. (Earth Leakage Circuit Breaker)
State function of starter and ELCB. (Earth Leakage Circuit Breaker)
Last answer:
i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.
function
starter
elcb
earth
leakage
circuit
breaker
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371
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1
answer
asked
Apr 30, 2018
by
anonymous
Breaking capacity of a circuit breaker is usually expressed in terms of
Breaking capacity of a circuit breaker is usually expressed in terms of (1) Ampere (2) Volts (3) MW (4) MVA
Last answer:
Breaking capacity of a circuit breaker is usually expressed in terms of MVA
breaking
capacity
circuit
breaker
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146
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1
answer
asked
Apr 29, 2018
by
anonymous
The arc voltage in a circuit breaker is :
The arc voltage in a circuit breaker is :
Last answer:
The arc voltage in a circuit breaker is : in phase with the arc current
arc
voltage
circuit
breaker
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68
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1
answer
asked
Apr 29, 2018
by
anonymous
Which of the following is used in a circuit breaker as the medium in which the arc forms?
Which of the following is used in a circuit breaker as the medium in which the arc forms? A) Insulating gas B) Insulating oil C) Vacuum D) All the above
Last answer:
Which of the following is used in a circuit breaker as the medium in which the arc forms? A) Insulating gas B) Insulating oil C) Vacuum D) All the above
circuit
breaker
arc
forms
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81
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1
answer
asked
Mar 19, 2018
by
anonymous
Thermal overload relays are used to protect the motor against over current due to?
Last answer:
Thermal overload relays are used to protect the motor against overcurrent due to heavy loads.
thermal
relays
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135
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1
answer
asked
Mar 19, 2018
by
anonymous
A thermal protection switch can protect against?
Last answer:
A thermal protection switch can protect against overload.
thermal
protection
switch
protect
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177
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1
answer
asked
May 21, 2020
by
anonymous
Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Last answer:
Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on.
thermal
triggering
method
scr
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38
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1
answer
asked
Aug 15, 2019
by
anonymous
Define thermal runaway.
Define thermal runaway.
Last answer:
Thermal runaway The problem with increasing temperature causing increasing collector current is that more current increase the power dissipated by the transistor which, in turn, increases its temperature ... self-reinforcing cycle is known as thermal runaway, which may destroy the transistor.
thermal
runaway
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33
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1
answer
asked
Aug 2, 2019
by
anonymous
Classify condensers used in thermal power station. Explain each type in brief.
Classify condensers used in thermal power station. Explain each type in brief.
Last answer:
Types of condenser: Classification: 1. Jet Condenser (Mixing Type) 2. Surface condenser (non Mixing type) Explanation:- 1. Jet Condenser (Mixing Type) In Jet condenser the steam ... there in no direct contact between the steam and cooling water. This condensate is reused in boiler.
condensers
thermal
power
station
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1
answer
asked
Aug 2, 2019
by
anonymous
"Efficiency of thermal power station is low". — Justify.
"Efficiency of thermal power station is low". — Justify.
Last answer:
Justification: Efficiency of thermal power station is low":- Overall efficiency of T.P.P depends upon efficiency of boiler, turbine and alternator. The heat produced due to combustion of coal ... losses in thermal power plant is 71%, So efficiency of thermal power plant is less about 29%
efficiency
thermal
power
station
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60
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1
answer
asked
Aug 2, 2019
by
anonymous
State advantages of Pulverized coal w.r.t. thermal power plant.
State advantages of Pulverized coal w.r.t. thermal power plant.
Last answer:
Advantages of Pulverized coal w.r.t. thermal power plant. 1. Due to pulvarization amount of fuel required to produce same amount of heat reduces. 2. Time required for combution reduces ... of air and thorough mixing of air and fuel, very high-combustion temperatures can be attained.
advantages
pulverized
coal
thermal
power
plant
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1
answer
asked
Aug 2, 2019
by
anonymous
State the function of super heater of a thermal power plant.
State the function of super heater of a thermal power plant.
Last answer:
Function of Super heater: - Its function is to increase the temperature of steam by absorbing heat from exhausted hot flue gases.
function
super
heater
thermal
power
plant
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53
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1
answer
asked
Jul 24, 2019
by
anonymous
Describe thermal runaway of transistor and explain how it can be avoided.
Describe thermal runaway of transistor and explain how it can be avoided.
Last answer:
Concept of thermal runaway: 1.We know that IC = β IB + (1+ β) ICO Where ICO is the leakage current and ICO is strongly dependent on temperature. 2. Leakage current approximately doubles for ... Thermal runaway can be avoided by : 1) Using stabilization circuitry 2) Heat sink
thermal
runaway
transistor
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187
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2
answers
asked
Sep 8, 2018
by
anonymous
State the function of cooling tower and condenser in thermal power station.
State the function of cooling tower and condenser in thermal power station.
Last answer:
1. Condenser: Function of condenser is to convert exhaust steam again into water by reducing its temperature with the help of cold water. Also it reduces back pressure of steam turbine 2 ... tower : The function of cooling tower is to reduce the temperature of water coming from condenser.
function
cooling
tower
condenser
thermal
power
station
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137
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1
answer
asked
Sep 7, 2018
by
anonymous
Write any four advantages and four disadvantages of thermal power plant.
Write any four advantages and four disadvantages of thermal power plant.
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
advantages
disadvantages
thermal
power
plant
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148
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3
answers
asked
Sep 7, 2018
by
anonymous
Explain ash disposal and dust collection in a thermal power plant.
Explain ash disposal and dust collection in a thermal power plant.
Last answer:
Ash disposal:- Various methods of disposal of ash are: Mechanical handling system. Pneumatic system. Hydraulic system Steam jet system Commonly used ash handling ... be done either manually or automatically. This removed fly ash is collected in separate container
ash
disposal
dust
collection
thermal
power
plant
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40
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1
answer
asked
Sep 7, 2018
by
anonymous
State any four factors governing Selection of site for thermal power station.
State any four factors governing Selection of site for thermal power station.
Last answer:
Following Factors are to be considered:- 1. It should locate near coal mine. 2. Sufficient quantity of water should be available. 3. Sufficient large space should be available. 4. It should be located ... laws of the land and the town planning. 14. The interests of national defense must be served.
factors
governing
selection
thermal
power
station
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2
answers
asked
May 8, 2018
by
anonymous
The overall efficiency of Thermal Power Plant is equal to _______________ .
The overall efficiency of Thermal Power Plant is equal to _______________ . (A) Regenerative Cycle Efficiency (B) Renkine Cycle Efficiency (C) Carnot cycle efficiency (D) None of the above
Last answer:
The overall efficiency of Thermal Power Plant is equal to Regenerative Cycle Efficiency.
overall
efficiency
thermal
power
plant
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117
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1
answer
asked
May 3, 2018
by
anonymous
In a thermal power plant, ash is collected in
In a thermal power plant, ash is collected in
Last answer:
In a thermal power plant, ash is collected in hoppers or bunkers
thermal
power
plant
ash
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74
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1
answer
asked
Apr 30, 2018
by
anonymous
The unit heat rate characteristic of a thermal power unit shows :
The unit heat rate characteristic of a thermal power unit shows : (A) Heat input per kWh of output versus the megawatt output of unit (B) Heat input per kW of output versus the megawatt output of unit (C) Heat input per kWh of output versus the megawatt hour output of unit (D) Heat input per kW of output versus the megawatt hour output of unit
Last answer:
The unit heat rate characteristic of a thermal power unit shows : Heat input per kWh of output versus the megawatt output of unit
unit
heat
rate
characteristic
thermal
power
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54
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1
answer
asked
Mar 10, 2018
by
anonymous
What is thermal runaway of a transistor?
What is thermal runaway of a transistor?
thermal
runaway
transistor
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64
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0
answers
asked
May 8, 2018
by
anonymous
Which of the following circuit breakers has high reliability & minimum maintenance?
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
circuit
breakers
high
reliability
minimum
maintenance
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135
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1
answer
asked
May 8, 2018
by
anonymous
If the % reactance upto the fault point is 20%, then the short circuit current will be
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
reactance
fault
point
short
circuit
current
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2.6k
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1
answer
asked
May 8, 2018
by
anonymous
The following is/are the characteristics of SF6 circuit breakers:
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
characteristics
sf6
circuit
breakers
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80
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1
answer
asked
Mar 20, 2018
by
anonymous
A fuse in a motor circuit provides protection against?
Last answer:
A fuse in a motor circuit provides protection against short-circuit and overload.
fuse
motor
circuit
protection
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111
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1
answer
asked
Mar 20, 2018
by
anonymous
Air blast circuit breakers for 400 kV power system are designed to operate in?
Last answer:
Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.
air
blast
circuit
breakers
power
system
designed
operate
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179
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1
answer
asked
Mar 20, 2018
by
anonymous
The short circuit in any winding of the transformer is the result of?
Last answer:
The short circuit in any winding of the transformer is the result of impulse voltage.
short
circuit
winding
transformer
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131
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1
answer
asked
Mar 20, 2018
by
anonymous
The time of closing the cycle, in modern circuit breakers is?
Last answer:
The time of closing the cycle, in modern circuit breakers is 0.003 sec.
time
cycle
modern
circuit
breakers
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98
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1
answer
asked
Mar 19, 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.
oil
air
blast
circuit
breakers
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299
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1
answer
asked
Mar 19, 2018
by
anonymous
Circuit breakers are essentially?
Last answer:
Circuit breakers are essentially current carrying contacts called electrodes.
circuit
breakers
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252
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1
answer
asked
Mar 19, 2018
by
anonymous
Circuit breakers usually operate under?
Last answer:
Circuit breakers usually operate under transient state of short-circuit current.
circuit
breakers
operate
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75
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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.
arc
circuit
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219
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1
answer
asked
Mar 19, 2018
by
anonymous
In which fault the maximum short circuit current occurs?
In which fault the maximum short circuit current occurs?
Last answer:
In three phase bolted fault the maximum short circuit occurs.
fault
maximum
short
circuit
current
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1
answer
...