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A thermal protection switch can protect against?
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asked
Mar 19, 2018
by
anonymous
thermal
protection
switch
protect
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1
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answered
Mar 19, 2018
by
anonymous
A thermal protection switch can protect against
overload.
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Mar 19, 2018
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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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Apr 30, 2018
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IDMT relays are used to protect the transformer against :
IDMT relays are used to protect the transformer against : (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage
Last answer:
IDMT relays are used to protect the transformer against : External short circuits
idmt
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transformer
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Apr 27, 2018
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To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?
To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?
Last answer:
To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ? Δ-Δ connection
protect
power
transformer
neutral
grounded
fault
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318
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answer
asked
May 8, 2018
by
anonymous
A relay used for protection of motors against overload is :
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:
A relay used for protection of motors against overload is : Thermal relay
relay
used
protection
motors
overload
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235
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asked
Mar 20, 2018
by
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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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Apr 30, 2018
by
anonymous
For protection of rotating machines against lightning surges _______ is used.
For protection of rotating machines against lightning surges _______ is used. (1) lightning arrester (2) capacitor (3) combination of lightning arrester and capacitor (4) lightning conductor and arrester
Last answer:
For protection of rotating machines against lightning surges combination of lightning arrester and capacitor is used.
protection
rotating
machines
lightning
surges
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1
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asked
Apr 29, 2018
by
anonymous
Reactance relay is normally preferred for protection against
Reactance relay is normally preferred for protection against
Last answer:
Reactance relay is normally preferred for protection against earth faults
reactance
relay
protection
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72
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1
answer
asked
Apr 26, 2018
by
anonymous
Surge absorbers are used for protection against
Surge absorbers are used for protection against
Last answer:
Surge absorbers are used for protection against low voltage high frequency oscillations
surge
absorbers
used
protection
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1
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asked
Mar 20, 2018
by
anonymous
The inverse definite mean time relays are used for over current and earth fault protection of transformer against?
Last answer:
The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.
inverse
definite
mean
time
relays
used
over
current
earth
fault
protection
transformer
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answer
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Mar 20, 2018
by
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For the protection of power station buildings against direct strokes the requirements are?
Last answer:
For the protection of power station buildings against direct strokes the requirements are interception, conduction and dissipation.
protection
power
station
direct
strokes
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58
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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
Blind spot is a point in the zones of protection where
Blind spot is a point in the zones of protection where
Last answer:
Blind spot is a point in the zones of protection where No protection is available.
blind
spot
point
zones
protection
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586
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1
answer
asked
May 1, 2018
by
anonymous
A negative sequence relay is used for protection of
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
negative
sequence
relay
used
protection
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454
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1
answer
asked
Dec 17, 2017
by
anonymous
What is the difference between a switch and a relay?
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 .
difference
between
switch
relay
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1
answer
asked
Jun 18, 2018
by
anonymous
An inductor is connected in series with SCR to protect it from
An inductor is connected in series with SCR to protect it from A) Excessive high voltage B) Excessive high dv/dt C) Excessive high di/dt D) Excessive large forward current
Last answer:
An inductor is connected in series with SCR to protect it from Excessive high di/dt
inductor
series
scr
protect
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1
answer
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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129
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1
answer
asked
Mar 20, 2018
by
anonymous
Protection by fuses is generally not used beyond?
Last answer:
Protection by fuses is generally not used beyond 100 A .
protection
fuses
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1
answer
asked
Mar 20, 2018
by
anonymous
Overfluxing protection is recommended for?
Last answer:
Overfluxing protection is recommended for generator transformer of the power plant.
overfluxing
protection
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1
answer
asked
Mar 20, 2018
by
anonymous
Over voltage protection is recommended for?
Last answer:
Over voltage protection is recommended for hydro-electric generators, steam turbine generators, gas turbine generators.
over
voltage
protection
recommended
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1
answer
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Mar 20, 2018
by
anonymous
The single phasing relays are used for the protection of?
Last answer:
The single phasing relays are used for the protection of three phase motors.
single
phasing
relays
used
protection
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136
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1
answer
asked
Mar 20, 2018
by
anonymous
Discrimination between main and backup protection is provided by the use of relays which are?
Last answer:
Discrimination between main and back up protection is provided by the use of relays which are slow.
discrimination
between
main
backup
protection
use
relays
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305
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1
answer
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Mar 20, 2018
by
anonymous
The delay fuses are used for the protection of?
Last answer:
The delay fuses are used for the protection of motors.
delay
fuses
protection
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1
answer
asked
Aug 9, 2017
by
anonymous
Primary and Backup Protection
Primary and Backup Protection
Last answer:
Primary and Backup Protection B,D,G,I are the primary protection. A,C,H,J are the backup protection. About 90% of faults are clear by Primary Protection. So ... ordinated backup (primary is at various station and backup is at control room with computer)
primary
backup
protection
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354
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1
answer
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May 8, 2018
by
anonymous
Earthing switch is used for?
Earthing switch is used for? (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above
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Earthing switch is used for? (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above
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switch
used
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64
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1
answer
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Jun 4, 2018
by
anonymous
Which type of protection is provided on a generator to protect against stator insulation failure?
Which type of protection is provided on a generator to protect against stator insulation failure? A) Differential protection B) Overcurrent relay C) Thermocouple actuated alarm D) Reverse power relay
Last answer:
Which type of protection is provided on a generator to protect against stator insulation failure? A) Differential protection B) Overcurrent relay C) Thermocouple actuated alarm D) Reverse power relay
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280
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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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190
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2
answers
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
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
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
Apr 28, 2018
by
anonymous
A switch tail ring counter is made by using a single D-FF. The resulting circuit is
A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF
Last answer:
A switch tail ring counter is made by using a single D-FF. The resulting circuit is T-FF
switch
tail
ring
counter
made
single
circuit
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68
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1
answer
asked
Mar 25, 2018
by
anonymous
A closed switch has a resistance of?
A closed switch has a resistance of?
Last answer:
A closed switch has a resistance of zero.
closed
switch
resistance
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125
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1
answer
asked
Mar 20, 2018
by
anonymous
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then?
Last answer:
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.
centrifugal
switch
capacitor
motor
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90
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1
answer
asked
Mar 20, 2018
by
anonymous
In a single phase motor the centrifugal switch?
Last answer:
In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.
single
phase
motor
centrifugal
switch
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129
views
1
answer
asked
Mar 20, 2018
by
anonymous
A centrifugal switch is used to disconnect starting winding when motor has?
Last answer:
A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.
centrifugal
switch
used
disconnect
starting
winding
motor
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200
views
1
answer
asked
Mar 6, 2018
by
anonymous
Is thyristor a DC switch?
Last answer:
Yes ,it is one of the main advantage using thristors as a switch in DC circuit ,it has a high current gain
thyristor
dc
switch
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133
views
2
answers
asked
Sep 27, 2017
by
anonymous
in which region BJT act as a switch?
Last answer:
BJT act as switch in saturation and cutoff region ( ON state in saturation region and OFF state in cut-off region )
bjt
region
switch
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91
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2
answers
asked
Sep 15, 2017
by
anonymous
why IGBT is preferred as a power switch over both power BJT and MOSFET?
Last answer:
Because it has a higher switching frequency and heat tolerance.
igbt
bjt
mosfet
power
switch
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110
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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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45
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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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62
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1
answer
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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138
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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:
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advantages
disadvantages
thermal
power
plant
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148
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3
answers
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
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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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118
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1
answer
asked
Jul 25, 2019
by
anonymous
Explain in detail over-voltage protection.
Explain in detail over-voltage protection.
Last answer:
Over-voltage protection: Over-voltage protection to the thyristor is provided using: i) R-C Snubber circuit ii) Non-linear resistor Thyrector A) Snubber Circuit: It is basically a ... returns to its high resistance state. Thyrector is normally placed across the supply terminals.
over-voltage
protection
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2.5k
views
1
answer
asked
May 2, 2020
by
anonymous
Draw & explain touch plate switch using IC555.
Draw & explain touch plate switch using IC555.
Last answer:
It is construct form monostable multivibrator , when metal plates touch by finger then voltage at pin number 2 goes to below 1/3 Vcc then output of lower comparator becomes high hence flip flop set and ... then output of timer goes low and it low till up to the metal plates touch by finger .
draw
&
explain
touch
plate
switch
using
ic555
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...