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Why is pulse train gating preferred over pulse gating ?
asked
Mar 11, 2018
by
anonymous
Why is pulse train gating preferred over pulse gating? Explain with relevant circuit and waveforms, the pulse train gating of SCRs.
pulse
train
gating
scr
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asked
Jan 2
by
anonymous
Draw a neat sketch of Gating system. State the functions of any four elements.
Draw a neat sketch of Gating system. State the functions of any four elements.
Last answer:
Gating system: 1. Sprue: The circular cross section that minimizes heat loss and turbulence is sprue, and the area of it is quantified from the choke area as well as the gating ratio. 2. ... the molten metal flow from the ingate has to be proportional to the casting area's volume.
gating
system
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asked
Mar 10, 2018
by
anonymous
Explain the pulse width modulation technique for control of AC output voltage.
Explain the pulse width modulation technique for control of AC output voltage.
pulse
width
modulation
technique
control
ac
output
voltage
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answers
asked
Jun 18, 2018
by
anonymous
A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the
A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m
Last answer:
A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m
pulse
repetition
frequency
radar
emitting
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answer
asked
Jun 18, 2018
by
anonymous
The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse
The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
Last answer:
The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
clock
frequency
8085
microprocessor
system
minimum
pulse
width
intr
signal
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asked
Jun 18, 2018
by
anonymous
What is the Fourier transform of a Gaussian time pulse?
What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse
Last answer:
What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse
fourier
transform
gaussian
time
pulse
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asked
Oct 13, 2019
by
anonymous
How GTO is advantages over SCR
How GTO is advantages over SCR
Last answer:
i) It is turned-off by negative gate pulse. ii) No commutation circuit required, reducing the cost, size, weight and volume of the circuit. iii) As commutation choke is not used, the associated acoustic ... turn off time permits high switching frequency. v) It has higher di/dt rating at turn-off.
gto
advantages
scr
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asked
Jun 18, 2018
by
anonymous
A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz
A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is A) 7.5 m B) 7.5 Km C) 75 m D) 750 m
Last answer:
A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is 7.5 m
pulse
compression
radar
transmits
encoded
frequency
chirp
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asked
Apr 26, 2018
by
anonymous
A 1ms pulse can be stretched to 1 s pulse by using
A 1ms pulse can be stretched to 1 s pulse by using (A) an astable multivibrator (B) a monostable multivibrator (C) a bistable multivibrator (D) a Schmitt trigger circuit
Last answer:
A 1ms pulse can be stretched to 1 s pulse by using a monostable multivibrator
pulse
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asked
Apr 28, 2018
by
anonymous
Specific energy consumption of an electric train is the ratio between
Specific energy consumption of an electric train is the ratio between (A) Specific energy output at driving wheels and efficiency of the traction motor (B) Specific energy output at driving wheels and efficiency of the transmission gear (C) Specific energy output of driving motor and efficiency of the driving wheels (D) Specific energy output at driving wheels and efficiency of the (motor + transmission gear)
Last answer:
Specific energy consumption of an electric train is the ratio between Specific energy output at driving wheels and efficiency of the (motor + transmission gear)
energy
consumption
electric
train
ratio
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asked
Mar 22, 2018
by
anonymous
Power for lighting in passanger coach, in a long distance electric train, is provided?
Last answer:
Power for lighting in passanger coach, in a long distance electric train, is provided through individual generator of bogie and batteries.
power
lighting
passanger
coach
long
distance
electric
train
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1
answer
asked
Mar 22, 2018
by
anonymous
The resistance encountered by a train in motion is on account of?
Last answer:
The resistance encountered by a train in motion is on account of resistance offered by air, friction at the track, friction at various parts of the rolling stock.
resistance
encountered
train
motion
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asked
Mar 22, 2018
by
anonymous
The air resistance to the movement of the train is proportional to?
air
resistance
movement
train
proportional
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answers
asked
Mar 11, 2018
by
anonymous
Is a train a locomotive?
Is a train a locomotive?
train
locomotive
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asked
Mar 19, 2018
by
anonymous
Why SCR is called as thyristor?
Why SCR is called as thyristor?
scr
thyristor
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answers
asked
Mar 22, 2018
by
anonymous
The wheels of a train, engine as well as bogies, are slightly tapered to?
Last answer:
The wheels of a train, engine as well as bogies, are slightly tapered to facilitate in taking turns.
wheels
train
engine
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1
answer
asked
May 13, 2018
by
anonymous
After firing as SCR, the gating pulse is removed. The current in the SCR will
After firing as SCR, the gating pulse is removed. The current in the SCR will 1. remain the same 2. immediately fall to zero 3. rise up 4. None
Last answer:
After firing as SCR, the gating pulse is removed. The current in the SCR will remain the same
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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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answer
asked
Apr 29, 2018
by
anonymous
SCR is more utilized as compared to Triac because it is
SCR is more utilized as compared to Triac because it is
Last answer:
SCR is more utilized as compared to Triac because it is available with higher ratings
scr
triac
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1
answer
asked
Apr 28, 2018
by
anonymous
An SCR without any external connections is considered as
An SCR without any external connections is considered as (A) two diodes in series (B) three diodes in series (C) two n-p-n transistors in series (D) two p-n-p transistors in series
Last answer:
An SCR without any external connections is considered as three diodes in series
scr
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1
answer
asked
Mar 19, 2018
by
anonymous
Is a SCR a thyristor?
Is a SCR a thyristor?
Last answer:
Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.
scr
thyristor
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140
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1
answer
asked
Mar 6, 2018
by
anonymous
Is SCR unidirectional switch?
Last answer:
Yes, SCR is a unidirectional switch.
scr
unidirectional
switch
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asked
Feb 3, 2018
by
anonymous
What is holding current and latching current in SCR ?
What is holding current and latching current in SCR? Draw the gate characteristics of an SCR and explain the characteristics. What are the different signals which can be used for turning on SCR by gate control? compare them.
Last answer:
(i) Holding Current: Holding current is defined as the minimum anode current required to maintain conducting SCR in the on-state. (ii) Latching Current: Latching current is defined as the ... the on-state immediately after the SCR has been turned on and the gate signal has been removed.
holding
current
latching
scr
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2
answers
asked
Dec 9, 2017
by
anonymous
What is the use of SCR?
What is the use of SCR?
Last answer:
SCR are use in lamp dimming, power regulators, motor control, rectifications of high power AC, control of welding machines and also use as switch these are some uses of silicon controlled rectifier.
use
scr
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1
answer
asked
May 21, 2020
by
anonymous
Explain triggering of SCR using opto-coupler. State its advantages.
Explain triggering of SCR using opto-coupler. State its advantages.
Last answer:
Triggering of SCR using opto-coupler: A simple opto-coupler based triggering circuit for SCR is shown in the figure. An optocoupler or opto-isolator is a combination of light source ... is small size and light weight device. iii)Interfacing with logic circuits is easily possible.
triggering
scr
opto-coupler
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1
answer
asked
May 21, 2020
by
anonymous
Draw the circuit diagram of battery charger using SCR and explain it’s working.
Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last answer:
Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.
circuit
diagram
battery
charger
scr
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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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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
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asked
Oct 13, 2019
by
anonymous
Temperature controller using SCR
Temperature controller using SCR
Last answer:
Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.
temperature
controller
scr
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125
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1
answer
asked
Oct 13, 2019
by
anonymous
Compare SCR and TRIAC
Compare SCR and TRIAC
Last answer:
SCR TRIAC It is an unidirectional device. It is a bidirectional device. It is turned-on by only positive gate current. It can be turned-on by either ... applications including lamp dimmer, heating control, zero voltage switched AC relay, small AC motor control etc.
scr
triac
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1
answer
asked
Oct 13, 2019
by
anonymous
Describe triggering of SCR using UJT relaxation oscillator.
Describe triggering of SCR using UJT relaxation oscillator.
Last answer:
Triggering of SCR using UJT relaxation oscillator:
triggering
scr
ujt
relaxation
oscillator
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266
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1
answer
asked
Jul 25, 2019
by
anonymous
Draw a neat labelling V-I characteristics of SCR and explain the region
Draw a neat labelling V-I characteristics of SCR and explain the region
Last answer:
(i) Latching current: It is the minimum anode current required to maintain the SCR in the conduction state just after turn-on and the gate signal has been removed. (ii) Holding current: It is the minimum anode current required to hold the conducting SCR in the ON state.
scr
characteristics
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2
answers
asked
Jul 25, 2019
by
anonymous
Draw construction of SCR using two transistor model. Explain its operation.
Draw construction of SCR using two transistor model. Explain its operation.
Last answer:
Two Transistor Model of SCR or Thyristor
two
transistor
model
construction
scr
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1
answer
asked
Jun 18, 2018
by
anonymous
The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of
The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz
scr
turned
off
voltage
reversal
anode-cathode
ac
supply
frequency
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0
answers
asked
Apr 28, 2018
by
anonymous
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last answer:
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V
phase
controlled
single-phase
full-controlled
scr
bridge
converter
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asked
Apr 28, 2018
by
anonymous
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load,
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses
Last answer:
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses
single-phase
scr
bridge
converter
operating
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1
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asked
Mar 6, 2018
by
anonymous
SCR turned off when the anode current falls below?
Last answer:
SCR turned off when the anode current falls below holding current.
scr
turned
off
anode
current
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516
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1
answer
asked
May 25, 2018
by
anonymous
A thyristor is triggered by a pulse train of 5 kHz. The duty ratio is 0.4. If the allowable average power is 100 W,
A thyristor is triggered by a pulse train of 5 kHz. The duty ratio is 0.4. If the allowable average power is 100 W, the maximum allowable gate drive power will be
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asked
Jul 1, 2020
by
anonymous
Why silicon is preferred over Ge?
Why silicon is preferred over Ge?
Last answer:
1) Silicon is plenty available compared to Ge. 2) Extraction process of Si is easy and less expensive. 3) Si has more thermal stability as compared to Ge. 4) Si has more breakdown voltage as compared to Ge.
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115
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1
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asked
May 13, 2018
by
anonymous
A FET is preferred over an ordinary transistor because it
A FET is preferred over an ordinary transistor because it 1. Permits high degree of isolation between input & output circuits 2. Has low noise level 3. Has very high power gain 4. Has all the above properties
Last answer:
A FET is preferred over an ordinary transistor because it Has all the above properties
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1
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asked
Mar 19, 2018
by
anonymous
Why thyristor are not preferred for inverter?
Why thyristor are not preferred for inverter?
thyristor
preferred
inverter
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0
answers
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
Apr 28, 2018
by
anonymous
In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR
In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell
Last answer:
In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in voltage notching
3-phase
converter
circuit
commutation
scr
phase
turned
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asked
Jan 2
by
anonymous
Purpose of Selective Catalytic Reduction (SCR)
Purpose of Selective Catalytic Reduction (SCR)
Last answer:
Purpose of Selective Catalytic Reduction (SCR) : 1. It reduces Nox 75% to 90% 2. Converts it in to molecular nitrogen and water vapor 3. It reduces HC emission up to 80% 4. It reduces PM emission 20 to 25%.
purpose
selective
catalytic
reduction
scr
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asked
Apr 28, 2018
by
anonymous
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α
Last answer:
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ
no-load
speed
single-phase
scr
bridge
converter
fed
separately
excited
dc
motor
operating
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asked
Mar 15, 2018
by
anonymous
How do you test an SCR?
How do you test an SCR?
test
scr
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asked
May 14, 2018
by
anonymous
TCXO is preferred over LC oscillator because
TCXO is preferred over LC oscillator because • TCXO is more stable. • TCXO gives more power • TCXO is linear. • None of the above.
Last answer:
TCXO is preferred over LC oscillator because TCXO is more stable.
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1
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asked
Apr 28, 2018
by
anonymous
RC triggering is preferred over resistance triggering because
RC triggering is preferred over resistance triggering because (A) it provides triggering at a precise instant (B) it gives a longer duration gate pulse (C) it enables triggering at a larger value of firing angle (D) it protects the SCR against high dv/dt
Last answer:
RC triggering is preferred over resistance triggering because it enables triggering at a larger value of firing angle
rc
triggering
resistance
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2.6k
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1
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asked
Apr 25, 2018
by
anonymous
Bulk power transmission over long HVDC lines is preferred because of
Bulk power transmission over long HVDC lines is preferred because of
Last answer:
Bulk power transmission over long HVDC lines is preferred because of Low cost of HVDC terminal
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1
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asked
Apr 9, 2018
by
anonymous
Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method...
Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: (1) Better speed regulation (2) Less loss in external resistance (3) Simplicity in control circuit (4) Reduced cost of controller
Last answer:
Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: Better speed regulation.
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asked
Apr 10, 2018
by
anonymous
Varley loop tests are preferred over Murray loop tests because
Varley loop tests are preferred over Murray loop tests because (1) Valley loop test can locate open circuit fault (2) Varley loop test gives higher accuracy (3) in Varley loop test provision is made for the measurement of total loop resistance instead of obtaining it from the relation R = pl/a (4) Valley loop test can locate the earth fault
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