Why is pulse train gating preferred over pulse gating ?

Question

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.

2.6k views

Please log in or register to answer this question.

← Prev Question Next Question →

Related questions

asked Jan 2 by anonymous

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.

0 like 0 dislike

17 views 1 answer

asked Mar 10, 2018 by anonymous

Explain the pulse width modulation technique for control of AC output voltage.

0 like 0 dislike

83 views 0 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

0 like 0 dislike

119 views 1 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

0 like 0 dislike

521 views 1 answer

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

0 like 0 dislike

99 views 1 answer

asked Oct 13, 2019 by anonymous

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.

0 like 0 dislike

484 views 1 answer

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

0 like 0 dislike

164 views 1 answer

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

0 like 0 dislike

104 views 1 answer

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)

0 like 0 dislike

76 views 1 answer

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.

0 like 0 dislike

73 views 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.

0 like 0 dislike

64 views 1 answer

asked Mar 22, 2018 by anonymous

The air resistance to the movement of the train is proportional to?

0 like 0 dislike

96 views 0 answers

asked Mar 11, 2018 by anonymous

Is a train a locomotive?

0 like 0 dislike

39 views 0 answers

asked Mar 19, 2018 by anonymous

Why SCR is called as thyristor?

0 like 0 dislike

81 views 0 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.

0 like 0 dislike

54 views 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

0 like 0 dislike

45 views 1 answer

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.

1 like 0 dislike

110 views 1 answer

asked Apr 29, 2018 by anonymous

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

0 like 0 dislike

61 views 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

0 like 0 dislike

75 views 1 answer

asked Mar 19, 2018 by anonymous

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.

0 like 0 dislike

140 views 1 answer

asked Mar 6, 2018 by anonymous

Is SCR unidirectional switch?

Last answer: Yes, SCR is a unidirectional switch.

0 like 0 dislike

56 views 1 answer

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.

2 like 0 dislike

814 views 2 answers

asked Dec 9, 2017 by anonymous

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.

2 like 1 dislike

75 views 1 answer

asked May 21, 2020 by anonymous

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.

0 like 0 dislike

66 views 1 answer

asked May 21, 2020 by anonymous

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.

0 like 0 dislike

205 views 1 answer

asked May 21, 2020 by anonymous

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.

0 like 0 dislike

38 views 1 answer

asked Oct 13, 2019 by anonymous

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.

0 like 0 dislike

664 views 1 answer

asked Oct 13, 2019 by anonymous

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.

0 like 0 dislike

125 views 1 answer

asked Oct 13, 2019 by anonymous

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.

0 like 0 dislike

77 views 1 answer

asked Oct 13, 2019 by anonymous

Describe triggering of SCR using UJT relaxation oscillator.

Last answer: Triggering of SCR using UJT relaxation oscillator:

0 like 0 dislike

266 views 1 answer

asked Jul 25, 2019 by anonymous

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.

0 like 0 dislike

381 views 2 answers

asked Jul 25, 2019 by anonymous

Draw construction of SCR using two transistor model. Explain its operation.

Last answer: Two Transistor Model of SCR or Thyristor

0 like 0 dislike

213 views 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

0 like 0 dislike

154 views 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

0 like 0 dislike

111 views 1 answer

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

0 like 0 dislike

115 views 1 answer

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.

0 like 0 dislike

516 views 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

0 like 0 dislike

123 views 0 answers

asked Jul 1, 2020 by anonymous

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.

0 like 0 dislike

115 views 1 answer

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

0 like 0 dislike

108 views 1 answer

asked Mar 19, 2018 by anonymous

Why thyristor are not preferred for inverter?

0 like 0 dislike

432 views 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

0 like 0 dislike

62 views 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

0 like 0 dislike

129 views 1 answer

asked Jan 2 by anonymous

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%.

0 like 0 dislike

5 views 1 answer

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

0 like 0 dislike

122 views 1 answer

asked Mar 15, 2018 by anonymous

How do you test an SCR?

0 like 0 dislike

47 views 0 answers

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.

0 like 0 dislike

126 views 1 answer

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

0 like 0 dislike

2.6k views 1 answer

asked Apr 25, 2018 by anonymous

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

0 like 0 dislike

392 views 1 answer

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.

0 like 0 dislike

142 views 1 answer

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

0 like 0 dislike

1.2k views 0 answers

Why is pulse train gating preferred over pulse gating ?

Please log in or register to add a comment.

Please log in or register to answer this question.

0 Answers

Related questions