An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
Last Answer : An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
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260 views
1 answer
asked
Jun 18, 2018
by
anonymous
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Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.
Last Answer : 1. A step down transformer 2. A rectifier 3. A filter 4. A regulator Operation of Regulated Power Supply:- Step Down Transformer:- A step down transformer will ... regulator. A regulator will maintain the output constant even when changes at the input or any other changes occur.
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2.0k views
3 answers
asked
May 2, 2020
by
anonymous

What is need of regulated power supply?
Last Answer : A regulated power supply is used to ensure that the output remains constant even if the input changes. But sometimes main supply voltage, load, and surrounding temperature keep changing and altering the ... power supply is needed that will accept an AC input and give a constant DC output.
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137 views
3 answers
asked
Sep 4, 2018
by
anonymous

What is the Power Supply specification for 8085AH microprocessor? A) Single +5V supply with 10% voltage margins B) Dual +5V supply with 10% voltage margins C) Single +10V supply with 5% voltage margins D) Dual +5V supply with 5% voltage margins
Last Answer : What is the Power Supply specification for 8085AH microprocessor? A) Single +5V supply with 10% voltage margins B) Dual +5V supply with 10% voltage margins C) Single +10V supply with 5% voltage margins D) Dual +5V supply with 5% voltage margins
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259 views
1 answer
asked
Jun 18, 2018
by
anonymous

Two 100W, 200V lamps are connected in series across a 200V supply. The total power consumed by each lamp will be in Watts
Last Answer : 4800
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453 views
2 answers
asked
May 8, 2018
by
anonymous

The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60
Last Answer : The time period of third harmonic of power supply frequency, in milliseconds, is 6.66
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541 views
1 answer
asked
Apr 28, 2018
by
anonymous

Last Answer : Overhead lines for power supply to tramcars are at a minimum height of 10 m.
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2.6k views
1 answer
asked
Mar 22, 2018
by
anonymous

Last Answer : The primary reason for low power factor is supply system is due to installation of induction motors.
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115 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.
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169 views
1 answer
asked
Mar 20, 2018
by
anonymous

Single-phase mid-point controlled rectifier with RL load
Last Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.
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213 views
1 answer
asked
Oct 13, 2019
by
anonymous

Single-phase Midpoint controlled rectifier with Resistive load
Last Answer : Single-phase Midpoint controlled rectifier with Resistive load: 1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.
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619 views
1 answer
asked
Oct 13, 2019
by
anonymous

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is
Last Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2
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1.4k views
1 answer
asked
Apr 29, 2018
by
anonymous

Last Answer : Full wave bridge rectifier is used in mobile chqrger.
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182 views
2 answers
asked
Sep 13, 2017
by
anonymous

Last Answer : the efficiency of centre tapped full wave rectifier and bridge rectifier is same that is 80.2% but the because of the use of Central trap the Transformer utilisation factor It's become low.hence we can say the bridge rectifier is more efficient
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104 views
1 answer
asked
Sep 13, 2017
by
anonymous

Last Answer : rectifier is a device which converts AC voltage to pulsating DC voltage using one or more diode diode conducts only in unit direction that is forward bias condition practically it does not conduct ... types one is with using two diodes and Centre tap Transformer and another is bridge wave rectifier
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104 views
1 answer
asked
Sep 13, 2017
by
anonymous

Last Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.
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149 views
2 answers
asked
Sep 13, 2017
by
anonymous

Last Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.
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139 views
2 answers
asked
Sep 13, 2017
by
anonymous

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz
Last Answer : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz
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394 views
1 answer
asked
Apr 26, 2018
by
anonymous

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
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187 views
0 answers
asked
Jun 18, 2018
by
anonymous

A three phase controlled rectifier
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3 views
0 answers

List out advantages and disadvantages of bridge rectifier.
Last Answer : Advantages : 1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded. 2. The need of center-tapped transformer is eliminated. ... The value of the diodes used should be precise , else there will be an error in rectification
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212 views
1 answer
asked
May 16, 2020
by
anonymous

Define PIV, TUF, ripple factor, efficiency of rectifier.
Last Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac
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828 views
2 answers
asked
May 2, 2020
by
anonymous

operation of half wave rectifier type AC Voltmeter.
Last Answer : Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce
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270 views
1 answer
asked
Sep 4, 2019
by
anonymous

need of rectifier and filter.
Last Answer : Need of rectifier: Every electronics circuit needs a D.C. power source for its operation. The rectifier circuit is used to convert A.C. supply to unidirectional pulses . Need of filter: A filter ... only the D.C. components to reach the load. So filter is used to provide ripple free output.
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60 views
1 answer
asked
Aug 19, 2019
by
anonymous

2.6k views
0 answers
asked
Jul 24, 2019
by
anonymous

Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.
Last Answer : 1. In positive half cycle (0 to Π): The end A of the secondary winding becomes positive and end B negative. This makes diode D1 and D4 forward biased while diode D2 and D3 are reverse biased. These two diodes will ... D2 and D3 when it is conducting is as follows. B - D2 - RL - D3 - A
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167 views
1 answer
asked
Sep 5, 2018
by
anonymous

Last Answer : The rectifier instrument is not free from frequency error.
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189 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : The scale of a rectifier instrument is linear.
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161 views
1 answer
asked
Mar 21, 2018
by
anonymous
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Last Answer : Rectifier is a device which convert AC to DC.
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2.6k views
1 answer
asked
Sep 21, 2017
by
anonymous

Last Answer : Ac to dc
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125 views
1 answer
asked
Sep 13, 2017
by
anonymous
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Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is
Last Answer : Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is constant
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1.3k views
1 answer
asked
Apr 28, 2018
by
anonymous

How To Make An Emergency Supply Kit
Last Answer : How To Make An Emergency Supply Kit Accidents and natural disasters happen; they are among the unavoidable and unpleasant occurrences that happen in life. Unfortunately, we can't predict when and ... emergency supply kit properly, and you'll be able to make it through the catastrophe unscathed.
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7 views
1 answer
asked
May 14, 2021
by
anonymous

Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.
Last Answer : 1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series. 2) ... 4) Effect on Life:- If supply voltage is not stable then life of LED get reduced.
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106 views
1 answer
asked
May 3, 2020
by
anonymous

Define phase sequence of three phase supply with waveforms. What is normal phase sequence? Which 3 standard colours are used to denote the phase sequence?
Last Answer : It is sunnosoidal sequence.
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134 views
1 answer
asked
Aug 11, 2018
by
anonymous

Define balanced supply and unbalanced supply.
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135 views
0 answers
asked
Aug 11, 2018
by
anonymous

Draw the waveform of three phase AC supply voltage.
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215 views
0 answers
asked
Aug 11, 2018
by
anonymous

A change of 4% in the supply voltage to an induction motor will produce a change of approximately
Last Answer : A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque
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485 views
1 answer
asked
May 8, 2018
by
anonymous

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be
Last Answer : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm
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151 views
1 answer
asked
May 8, 2018
by
anonymous

What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn
Last Answer : What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn
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547 views
1 answer
asked
May 8, 2018
by
anonymous

The supply for arc welding is :
Last Answer : The supply for arc welding is : Low voltage, high current ac or dc voltage
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93 views
1 answer
asked
Apr 29, 2018
by
anonymous

Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these
Last Answer : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these
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213 views
1 answer
asked
Apr 29, 2018
by
anonymous

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor ... (C) Its portion of share in load will increase (D) Its power factor would be decreased.
Last Answer : While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then Its portion of share in load will increase
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433 views
1 answer
asked
Apr 28, 2018
by
anonymous

In a three-phase supply floating neutral is undesirable because it way give rise to?
Last Answer : In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.
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117 views
1 answer
asked
Mar 25, 2018
by
anonymous

The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of?
Last Answer : The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of iron loss in core.
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170 views
1 answer
asked
Mar 25, 2018
by
anonymous

Last Answer : Reason is kinetic energy
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289 views
2 answers
asked
Mar 20, 2018
by
anonymous

Last Answer : If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.
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91 views
1 answer
asked
Mar 20, 2018
by
anonymous

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?
Last Answer : A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.
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234 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.
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118 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If the supply frequency to the transformer is increased, the iron loss will increase.
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170 views
1 answer
asked
Mar 19, 2018
by
anonymous
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In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?
Last Answer : In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.
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157 views
1 answer
asked
Mar 19, 2018
by
anonymous
