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The arc voltage produced in A.C. circuit breaker is always?
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Mar 20, 2018
by
anonymous
arc
voltage
circuit
breaker
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answered
Mar 20, 2018
by
anonymous
The arc voltage produced in A.C. circuit breaker is always
in phase with the arc current.
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Related questions
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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70
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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
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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
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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1
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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
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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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1
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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
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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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1
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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
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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
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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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1
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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
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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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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
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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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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
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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
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asked
Mar 19, 2018
by
anonymous
Thermal circuit breaker has?
Last answer:
Thermal circuit breaker has delayed trip action.
thermal
circuit
breaker
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1
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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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1
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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
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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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672
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1
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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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1
answer
asked
Apr 25, 2018
by
anonymous
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is ...
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W
Last answer:
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W
dc
open
circuit
voltage
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138
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1
answer
asked
Apr 29, 2018
by
anonymous
What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively?
What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these
Last answer:
What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these
rms
voltage
series
rl
circuit
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64
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1
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asked
Mar 21, 2020
by
anonymous
Source transformation Replace the circuit with voltage source in series with a single resistor
Last answer:
Source transformation Replace the circuit with voltage source in series with a single resistor
source
transformation
replace
the
circuit
with
voltage
in
series
a
single
resistor
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74
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1
answer
asked
Apr 29, 2018
by
anonymous
An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic
An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field
Last answer:
An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field
unshielded
moving
iron
voltmeter
used
measure
voltage
ac
circuit
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263
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1
answer
asked
Apr 29, 2018
by
anonymous
A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC
A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the
Last answer:
A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only
dc
voltage
source
series
rlc
circuit
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508
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1
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asked
Apr 29, 2018
by
anonymous
A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______
A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these
Last answer:
A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these
circuit
binds
upper
lower
extreme
waveform
fixed
dc
voltage
level
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83
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1
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asked
Sep 8, 2018
by
anonymous
Write the purpose of coal and ash handling unit. Also write different activities that arc carried out in this unit.
Write the purpose of coal and ash handling unit. Also write different activities that arc carried out in this unit.
Last answer:
Purpose of coal and ash handling unit :- To transport coal from coal storage to power plant. A large quantity of ash about 10 to 30 % produced in furnace, the removal of ash from boiler furnace ... disposed off. Various methods of disposal of ash: Mechanical system. Pneumatic system.
coal
ash
unit
arc
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28
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1
answer
asked
Apr 29, 2018
by
anonymous
The supply for arc welding is :
The supply for arc welding is :
Last answer:
The supply for arc welding is : Low voltage, high current ac or dc voltage
supply
arc
welding
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54
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1
answer
asked
Apr 30, 2018
by
anonymous
For arc welding current range is usually
For arc welding current range is usually (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A
Last answer:
For arc welding current range is usually 100 to 350 A
arc
welding
current
range
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108
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1
answer
asked
May 3, 2020
by
anonymous
Compare the AC and DC Arc lamps.
Compare the AC and DC Arc lamps.
Last answer:
AC Arc Lamp DC Arc Lamp Cross section area of electrode is same Cross section area of electrode is positive rod is twice that of negative rod Series inductor is used for stability ... supply is used for DC arc lamp Luminous efficiency is less Luminous efficiency is high
compare
the
ac
and
dc
arc
lamps
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122
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1
answer
asked
Apr 30, 2018
by
anonymous
Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :
Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : (A) Butt welding and Seam welding (B) Hydrogen shielding and Projection welding (C) Seam welding and Coated electrode welding (D) Coated electrode welding and Hydrogen shielding
Last answer:
Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : (A) Butt welding and Seam welding (B) Hydrogen shielding and Projection welding ... Seam welding and Coated electrode welding (D) Coated electrode welding and Hydrogen shielding
electric
arc
welding
resistance
methods
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78
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1
answer
asked
Mar 25, 2018
by
anonymous
In any A.C. circuit always?
In any A.C. circuit always?
Last answer:
In any A.C. circuit always apparent power is more than actual power.
ac
circuit
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96
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1
answer
asked
Oct 12, 2018
by
anonymous
Compare between Resistance welding and Arc welding on any six points.
Compare between Resistance welding and Arc welding on any six points.
Last answer:
Sr.No Parameters Resistance Welding Arc Welding 1 Type of welding Plastic/Pressure/Non-fusion welding Fusion/Non pressure welding 2 Principle of heat developed Heat ... It is suitable for mass production It is suitable for heavy job, maintenance and repair work
compare
resistance
welding
arc
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65
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1
answer
asked
May 1, 2018
by
anonymous
Arc resistance
Arc resistance (1) increases with increase in arc current (2) decrease with increase in arc current (3) is independent of arc current (4) is independent of arc length
Last answer:
Arc resistance decrease with increase in arc current
arc
resistance
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54
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1
answer
asked
May 26, 2018
by
anonymous
Which of the following medium is employed for extinction of arc in air circuit breaker ?
Which of the following medium is employed for extinction of arc in air circuit breaker ? (a) Water (b) Oil (c) Air (d) SF6
Last answer:
Which of the following medium is employed for extinction of arc in air circuit breaker ?(a) Water (b) Oil(c) Air (d) SF6
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163
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1
answer
asked
Mar 25, 2018
by
anonymous
The power factor of a D.C. circuit is always?
The power factor of a D.C. circuit is always?
Last answer:
The power factor of a D.C. circuit is always unity.
power
factor
dc
circuit
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144
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1
answer
asked
May 1, 2018
by
anonymous
In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage
In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?
Last answer:
In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C? 7 V
series
rlc
circuit
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127
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1
answer
asked
Mar 20, 2018
by
anonymous
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to?
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.
contacts
high
voltage
switches
power
system
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136
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1
answer
asked
Apr 27, 2018
by
anonymous
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
Last answer:
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25
power
system
voltage
controlled
buses
size
jacobian
matrix
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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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112
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1
answer
asked
Mar 19, 2018
by
anonymous
In order that current should flow without causing excessive heating or voltage drop, the relay contacts should?
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.
current
excessive
heating
voltage
drop
relay
contacts
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111
views
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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132
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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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300
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1
answer
asked
Apr 29, 2018
by
anonymous
Consider a circuit with four resistors in series connected to a voltage source. What happens to the voltage
Consider a circuit with four resistors in series connected to a voltage source. What happens to the voltage across each resistor, if the value of each of the resistors is doubled? A) It will double B) It will remain the same C) It will be halved D) It will become zero
Last answer:
Consider a circuit with four resistors in series connected to a voltage source. What happens to the voltage across each resistor, if the value of each of the resistors is doubled? A) It will double B) It will remain the same C) It will be halved D) It will become zero
resistors
series
voltage
source
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102
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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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91
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1
answer
asked
Aug 5, 2019
by
A supply of 24 V DC is applied across a
A supply of 24 V DC is applied across a circuit which consist of three resistors connected in parallel R1= 1.2KΩ, R2= 560 Ω, R3= 2.1Ω and a fourth resistor of 7.8 Ω connected in series with the parallel group. Determine the current, voltage and power across each resistor
Last answer:
Req= (1/1200 +1/560 + 1/2.1)^-1 = 2.1 ohms RT= 2.1 + 7.8 = 9.9 ohms IT = V/R = 24/9.9 = 2.4 A Veq= R I = 2.1 2 ... 7.8 = 12.096 w = 44.928 w _________________________________________ By: Ellis-Junior Kamatjipose ellisjuniork90@gmail.com
circuit
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141
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1
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asked
Mar 25, 2018
by
anonymous
Time constant of a circuit is the time in seconds taken after the application of voltage to each?
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.
constant
time
circuit
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...