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.
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880 views
1 answer
asked
Jul 25, 2019
by
anonymous

Describe the gate circuit for a single phase full converter.
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70 views
0 answers
asked
Mar 11, 2018
by
anonymous

Explain the operation of full bridge converters with their different operating modes. State its advantages and disadvantages.
Last Answer : Full bridge converter: Full bridge converter provides isolation between input and output. Full bridge converter is used for step up or step down the input voltage. Full bridge converter consists of four power semiconductor ... Require filter on both input and output.
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256 views
1 answer
asked
Feb 12, 2018
by
anonymous

single phase full converter
Last Answer : single phase full converter
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121 views
1 answer
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Nov 16, 2017
by
anonymous

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is
Last Answer : Please show the solution for this question
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515 views
2 answers
asked
Apr 29, 2018
by
anonymous

In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals
Last Answer : In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage
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136 views
1 answer
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 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
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182 views
1 answer
asked
Apr 28, 2018
by
anonymous

Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.
Last Answer : Circuit Diagram: Waveforms:
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531 views
1 answer
asked
May 21, 2020
by
anonymous

Draw circuit diagram of symmetrical configuration of bridge converter.
Last Answer : circuit diagram of symmetrical configuration of bridge converter
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83 views
1 answer
asked
May 21, 2020
by
anonymous

Give the effect of source impedance on converter operation.
Last Answer : Effect of source impedance on converter operation: For single-phase fully controlled bridge converter, the SCRs are triggered in pairs alternately. During positive half-cycle of input, SCRs T1 and T2 are triggered ... increases and as a consequence, the output dc voltage decreases.
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878 views
1 answer
asked
Jul 25, 2019
by
anonymous

Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.
Last Answer : Single phase fully controlled half wave converter: The circuit diagram of single-phase half-wave controlled rectifier with RL load and without freewheeling diode is shown in Fig. (a). The SCR T is ... , when again pulse is applied, the SCR is turned on & the above cycle is repeated.
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3.0k views
2 answers
asked
Jul 25, 2019
by
anonymous

The percent resolution of an 8 -bit D/A converter is
Last Answer : The percent resolution of an 8 -bit D/A converter is 0.392
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201 views
1 answer
asked
May 3, 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, 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
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177 views
1 answer
asked
Apr 28, 2018
by
anonymous

Explain buck or step down converter and draw its waveforms.
Last Answer : Buck converter or Step down converter: Buck converter is a step-down converter. The buck converter step-down the output voltage and step up the output current. Buck converter is a DC to DC converter. ... load. The output voltage is controlled by controlling on period and off period.
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139 views
1 answer
asked
Feb 12, 2018
by
anonymous

Explain flyback converter and draw its waveforms.
Last Answer : Flyback converter: A flyback converter is used for getting DC output and for isolating input mains and output voltage. A flyback converter is like a buck-boost converter with input and output isolated. There ... during the off time transformer transfer the energy to load.
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176 views
1 answer
asked
Sep 18, 2017
by
anonymous

Explain buck boost converter and draw its waveforms.
Last Answer : Buck-Boost converter: The buck-boost converter consists of a transistor for switching purpose, diode, inductor, and capacitor. Buck-boost converter is the combination of the buck converter and boost ... In buck-boost converter both input current and diode current are discontinuous.
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339 views
1 answer
asked
Sep 18, 2017
by
anonymous

what is Cuk converter and draw its waveforms.
Last Answer : Cuk converter: Cuk converter is the series combination of boost and the buck converter. The Cuk converter is the DC to DC converter whose output voltage is greater than or less the than the input ... controlling the switch duty cycle the output voltage can be controlled.
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503 views
1 answer
asked
Aug 6, 2017
by
anonymous

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
Last Answer : A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.
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169 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.
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98 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : More than 100%
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158 views
2 answers
asked
Mar 20, 2018
by
anonymous

Can you have a power factor greater than 1?
Last Answer : We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current.
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131 views
1 answer
asked
Mar 10, 2018
by
anonymous

What is meant by Power factor?
Last Answer : Ans. Power factor means ratio of true power to apparent power. It is cosine of phase angle between voltage and current. Its value is 1 for Unity P.F. Loads, 0 to 1 lagging for inductive loads and o to 1 leading for capacitive loads.
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17 views
1 answer

State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
Last Answer : i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor)
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354 views
1 answer
asked
May 22, 2020
by
anonymous

Briefly explain how the power factor of an inductive circuit can be improved.
Last Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.
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178 views
1 answer
asked
May 17, 2020
by
anonymous

What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz #powerfactor
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197 views
0 answers
asked
May 17, 2020
by
anonymous

Why capacitors are used to improve power factor?
Last Answer : Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.
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183 views
3 answers
asked
Aug 18, 2019
by
anonymous

Discuss how power factor tariff results into energy conservation.
Last Answer : Power factor tariff results into energy conservation: i) Applying incentives and penalties according to power factor is an effective way, which enables consumer to improve power factor so that he can ... finally leads to reduction in the current drawn by the load and helps for energy conservation.
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2.6k views
1 answer
asked
Sep 29, 2018
by
anonymous

Draw and explain bulk correction method for power factor & control.
Last Answer : Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95).
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112 views
1 answer
asked
Sep 29, 2018
by
anonymous

State the incentives and penalties related with power factor tariff.
Last Answer : Incentives and penalties related with power factor tariff: In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff) the tariff in which P.F. of ... industrial consumer/H.T/ commercial consumers with contract demand above 80 kw/ 100Kva/107 hp consumer.
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139 views
1 answer
asked
Sep 22, 2018
by
anonymous
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With a neat sketch explain working of 1 phase dynamometer type power factor meter.
Last Answer : Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load.
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200 views
1 answer
asked
Sep 6, 2018
by
anonymous

State the significance of power factor.
Last Answer : Significance of power factor:- 1. Cosine of angle between voltage & current in a circuit is called power factor. 2. It is a measure of the real power in a circuit. 3. Inductive & ... KVA rating equipment 5. Greater conductor size 6. CosØ = R/Z CosØ= Active Power/ Apparent Power
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57 views
1 answer
asked
Sep 6, 2018
by
anonymous

A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging
Last Answer : 0
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5.1k views
3 answers
asked
Apr 30, 2018
by
anonymous

The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)
Last Answer : The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)
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161 views
1 answer
asked
Apr 30, 2018
by
anonymous

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh
Last Answer : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh
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148 views
1 answer
asked
Apr 29, 2018
by
anonymous

In a synchronous generator delivering lagging power factor load (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) ... by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle
Last Answer : In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle
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340 views
1 answer
asked
Apr 29, 2018
by
anonymous

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
Last Answer : What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
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207 views
1 answer
asked
Apr 29, 2018
by
anonymous

The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile
Last Answer : The benefit of power factor correction in a power system is lower power consumption
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104 views
1 answer
asked
Apr 28, 2018
by
anonymous

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu ... pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu
Last Answer : The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are 0.866 pu, 0.5 pu
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97 views
1 answer
asked
Apr 28, 2018
by
anonymous

The power factor of a D.C. circuit is always?
Last Answer : The power factor of a D.C. circuit is always unity.
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218 views
1 answer
asked
Mar 25, 2018
by
anonymous

The ratio of active power to apparent power is known as____ factor.
Last Answer : The ratio of active power to apparent power is known as power factor.
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926 views
1 answer
asked
Mar 25, 2018
by
anonymous

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?
Last Answer : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.
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465 views
1 answer
asked
Mar 25, 2018
by
anonymous

Power factor of electric bulb is?
Last Answer : Power factor of electric bulb is unity.
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92 views
1 answer
asked
Mar 25, 2018
by
anonymous

The power factor at resonance in R-L- C parallel circuit is?
Last Answer : since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.
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973 views
2 answers
asked
Mar 25, 2018
by
anonymous

Power factor of the system is kept high?
Last Answer : Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.
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143 views
1 answer
asked
Mar 25, 2018
by
anonymous

Power factor of an inductive circuit is usually improved by connecting capacitor to it in?
Last Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.
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278 views
1 answer
asked
Mar 25, 2018
by
anonymous

Capacitors for power factor correction are rated in?
Last Answer : Capacitors for power factor correction are rated in kVAR.
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84 views
1 answer
asked
Mar 25, 2018
by
anonymous

Poor power factor?
Last Answer : Poor power factor reduces load handling capability of electrical system, results in more power losses in the electrical system, overloads alternators, transformers and distribution lines, results in more voltage drop in the line.
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65 views
1 answer
asked
Mar 25, 2018
by
anonymous

Power factor of an electrical circuit is equal to?
Last Answer : Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.
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516 views
1 answer
asked
Mar 24, 2018
by
anonymous

Last Answer : The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.
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296 views
2 answers
asked
Mar 21, 2018
by
anonymous

Last Answer : In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at 120°.
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132 views
1 answer
asked
Mar 21, 2018
by
anonymous
