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What is a phase control thyristor?
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Mar 19, 2018
by
anonymous
What is a phase control thyristor?
phase
control
thyristor
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asked
Feb 14, 2018
by
anonymous
Explain the principle of ON OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Last answer:
The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.
on
off
control
phase
ac
voltage
controller
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Aug 9, 2017
by
anonymous
speed control methods of three phase induction motor?
speed control methods of three phase induction motor?
Last answer:
Speed control of three phase induction motor
speed
control
phase
induction
motor
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Mar 19, 2018
by
anonymous
What is the use of a thyristor in a circuit?
What is the use of a thyristor in a circuit?
use
thyristor
circuit
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Mar 19, 2018
by
anonymous
What is a reverse conducting thyristor?
What is a reverse conducting thyristor?
reverse
conducting
thyristor
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Mar 19, 2018
by
anonymous
What is the function of a thyristor?
What is the function of a thyristor?
function
thyristor
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Mar 19, 2018
by
anonymous
What is thyristor family?
What is thyristor family?
thyristor
family
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Mar 19, 2018
by
anonymous
What is meant by firing angle of thyristor?
What is meant by firing angle of thyristor?
Last answer:
The point at which SCR is triggered is known as firings angle of thyristor.
firing
angle
thyristor
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Mar 19, 2018
by
anonymous
What is the application of thyristor?
What is the application of thyristor?
application
thyristor
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asked
Aug 8, 2017
by
anonymous
what is gate turn off thyristor (GTO)?
Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.
Last answer:
Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).
gto
gate
turn
off
thyristor
voltage
current
waveform
switching
characteristics
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Dec 6, 2017
by
anonymous
what are the disadvantages of thyristor?
what are the disadvantages of thyristor?
Last answer:
Disadvantages of thyristor The silicon controlled rectifier (SCR) is unidirectional devices, so it can control power only in DC power during positive half cycle of AC supply. Thus only DC power is ... cycle. It cannot be used at higher frequencies. The gate current cannot be negative
disadvantages
thyristor
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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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asked
Mar 19, 2018
by
anonymous
How is a thyristor used to convert AC to DC?
How is a thyristor used to convert AC to DC?
thyristor
used
convert
ac
dc
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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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Mar 19, 2018
by
anonymous
Why SCR is called as thyristor?
Why SCR is called as thyristor?
scr
thyristor
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May 8, 2018
by
anonymous
Thyristor can be protected from over voltages by using
Thyristor can be protected from over voltages by using
Last answer:
Thyristor can be protected from over voltages by using Voltage clamping device
thyristor
protected
over
voltages
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asked
May 8, 2018
by
anonymous
Leakage current flows through the thyristor in
Leakage current flows through the thyristor in
Last answer:
Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.
leakage
current
flows
thyristor
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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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asked
Feb 19, 2018
by
anonymous
Explain thyristor gate drive circuit.
Explain thyristor gate drive circuit.
Last answer:
Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.
thyristor
gate
drive
circuit
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asked
Dec 7, 2017
by
anonymous
parallel operation of mosfet can be done more easily as compared to thyristor. why?
parallel operation of MOSFET can be done more easily as compared to thyristor. why?
Last answer:
Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In ... the parallel operation of MOSFET can be done more easily as compared to the thyristor.
mosfet
thyristor
parallel
operation
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asked
Nov 15, 2017
by
anonymous
write short notes on thyristor CSI .
write short notes on thyristor CSI .
Last answer:
Current-source inverter (CSI) is an inverter with a DC current input. Current source inverters are most commonly used in very high power AC motor drives.
thyristor
csi
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2
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asked
May 1, 2018
by
anonymous
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last answer:
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
speed
three-phase
induction
motor
controlled
variable
voltage
frequency
control
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asked
Sep 21, 2017
by
anonymous
What is mean by forced commutation of thyristor?
Last answer:
By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.
forced
commutation
thyristor
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asked
Sep 21, 2017
by
anonymous
What is mean by natural commutation of thyristor?
Last answer:
Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply ... connected to positive and anode terminal get connected to negative, this turns off the thyristor.
natural
commutation
thyristor
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asked
Sep 10, 2017
by
anonymous
what is thyristor commutation?
Last answer:
Thyristor commutation means turning off thyristor.
thyristor
commutation
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asked
Oct 13, 2019
by
anonymous
Speed control of the motor using TRIAC
Speed control of the motor using TRIAC
Last answer:
Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.
speed
control
motor
triac
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asked
Mar 11, 2018
by
anonymous
Explain series switching control of AC load.
Explain series switching control of AC load. Single phase resistance load - Integral half cycle control Phase control - Resistance load
series
switching
control
ac
load
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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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asked
Sep 21, 2017
by
anonymous
when a thyristor conducts?
Last answer:
Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.
thyristor
conduct
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asked
Mar 10, 2018
by
anonymous
What is the difference between a line voltage and low voltage control system?
What is the difference between a line voltage and low voltage control system?
difference
between
line
voltage
low
control
system
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asked
Sep 10, 2017
by
anonymous
why thyristor is called semi controlled device?
Last answer:
Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.
thyristor
semi
controlled
device
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asked
Sep 10, 2017
by
anonymous
why thyristor is called latching device?
Last answer:
Thyristor can be turn on by positive gate pulse and the current will continue to flow through the device even when the gate voltage is low hence thyristor is called latching device.
thyristor
latching
device
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608
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1
answer
asked
May 3, 2020
by
anonymous
Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Last answer:
Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.
describe
the
working
principle
of
thyristor
operated
dimmer
with
help
circuit
diagram
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1
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asked
Sep 21, 2017
by
anonymous
can we turn off thyristor using Gate?
Last answer:
No we cannot turn off normal thyristor using Gate.
thyristor
turn
off
using
gate
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asked
Sep 21, 2017
by
anonymous
thyristor have how many terminals?
Last answer:
Thyristor have three terminals anode, cathode and Gate.
terminals
thyristor
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asked
Sep 10, 2017
by
anonymous
thyristor can be turned off by?
Last answer:
Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.
thyristor
turned
off
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1
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asked
Aug 9, 2017
by
anonymous
Thyristor Switched Capacitor (TSC)
Thyristor Switched Capacitor (TSC)
Last answer:
Thyristor Switched Capacitor (TSC) TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.
thyristor
switched
capacitor
tsc
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1
answer
asked
Mar 10, 2018
by
anonymous
What is control and automation?
What is control and automation?
control
automation
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48
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0
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asked
Mar 10, 2018
by
anonymous
What is the automatic control system?
What is the automatic control system?
automatic
control
system
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48
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0
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asked
Dec 16, 2017
by
anonymous
What is HT and LT control panels?
What is HT and LT control panels?
Last answer:
HT Panel is like LT Panel except that it is used for high tension cables. LT Panels :LT Panel is an electrical distribution board that receives power from generator or transformer and distributes the same to various electronic devices and distribution boards.
ht
lt
control
panels
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1
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asked
Jul 4, 2019
by
anonymous
What are the disadvantages of Open loop control system?
What are the disadvantages of Open loop control system?
Last answer:
Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.
open
loop
system
control
disadvantages
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1
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asked
Mar 10, 2018
by
anonymous
What are the electromagnetic waves used in remote control?
What are the electromagnetic waves used in remote control?
electromagnetic
waves
used
remote
control
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0
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Mar 10, 2018
by
anonymous
What are the advantages of open loop control system?
What are the advantages of open loop control system?
Last answer:
Open loop control system are simple to design. Open loop control system are generally stable.
advantages
open
loop
control
system
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90
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1
answer
asked
Mar 10, 2018
by
anonymous
What are the different types of control systems?
What are the different types of control systems?
different
types
control
systems
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54
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0
answers
asked
Dec 16, 2017
by
anonymous
What are the speed control methods of dc motor?
What are the speed control methods of dc motor?
Last answer:
Field control of DC motor Armature control of DC motor
speed
control
methods
dc
motor
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2
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asked
Jul 25, 2019
by
anonymous
Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Last answer:
Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.
single
phase
full
wave
bridge
controlled
converter
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1
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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
Mar 11, 2018
by
anonymous
Describe the gate circuit for a single phase full converter.
Describe the gate circuit for a single phase full converter.
gate
circuit
single
phase
full
converter
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0
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asked
Apr 30, 2018
by
anonymous
Oscillator independent of phase shift is
Oscillator independent of phase shift is (1) Relaxation (2) Wein bridge (3) Clapp (4) All of these
Last answer:
Oscillator independent of phase shift is Relaxation
oscillator
phase
shift
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73
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1
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asked
Apr 30, 2018
by
anonymous
A differentiator is not usually used in control system, because it : -
A differentiator is not usually used in control system, because it : - (A) reduces damping (B) increases error (C) reduces gain margin (D) increases input noise
Last answer:
A differentiator is not usually used in control system, because it : - increases input noise
differentiator
used
control
system
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1
answer
asked
Apr 28, 2018
by
anonymous
A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the
A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1
Last answer:
A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system crosses the real axis at -0.1.
unity
negative
feedback
control
system
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1
answer
...