A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging
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3 answers
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Apr 30, 2018
by
anonymous

Minimum voltage regulation occurs when the power factor of the load is?
Last Answer : Minimum voltage regulation occurs when the power factor of the load is leading.
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Mar 19, 2018
by
anonymous

A good voltage regulation of a transformer means?
Last Answer : A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.
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Mar 19, 2018
by
anonymous

Define load and line regulation.
Last Answer : 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as: % Load regulation = (VNL-VFL) / VFL *100 ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.
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Sep 5, 2018
by
anonymous

Identify the increasing order of voltage regulation of the following dc generators a same load : (A) differential compound, shunt and under compound (B) shunt, differential compound and ... C) under compound, shunt and differential compound (D) shunt, under compound and differential compound
Last Answer : Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound
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1 answer
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Apr 30, 2018
by
anonymous

Last Answer : The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.
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Mar 20, 2018
by
anonymous
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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
Last Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.
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152 views
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Mar 19, 2018
by
anonymous

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is (1) 141 (2) 92.3 (3) 9.23 (4) 1.41
Last Answer : An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is 9.23
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May 1, 2018
by
anonymous

Last Answer : A transformer can have regulation closer to zero on leading power factor.
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Mar 19, 2018
by
anonymous

A ferro resonant transformer regulation is also known as?
Last Answer : A ferro resonant transformer regulation is also known as constant current transformer.
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95 views
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Mar 19, 2018
by
anonymous

An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W
Last Answer : An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power? A) 49.98 W B) 79.98 W C) 99.96 W D) 199.93 W
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294 views
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Jun 18, 2018
by
anonymous

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω
Last Answer : A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω
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2.7k views
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Jun 18, 2018
by
anonymous

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :
Last Answer : A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is : 200 V
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1 answer
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Apr 30, 2018
by
anonymous

Last Answer : In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.
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Mar 21, 2018
by
anonymous

Last Answer : In over compounded generator, full load terminal voltage is more than no load terminal voltage.
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Mar 21, 2018
by
anonymous

Define line regulation and load regulation.
Last Answer : Load regulation is the ability of the power supply to maintain its specified output voltage over changes in the load. Line regulation is the ability of the power supply to maintain its specified output voltage over changes in the input line voltage.
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3 answers
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Jul 24, 2019
by
anonymous

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?
Last Answer : The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.
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302 views
1 answer
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Mar 20, 2018
by
anonymous

Classify hydro-electric power plants according to water flow regulation and explain in brief.
Last Answer : Classification of hydro-electric power plants according to water flow regulation of water flow:- 1. Large reservoir power plant 2. Run-off river (ROR) power plant with poundage 3. Run-off River ... depends upon rate of flow of water Initial cost is less Its purpose is to generate electricity.
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83 views
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Sep 7, 2018
by
anonymous

The unit of speed regulation of a governor is : (A) Hz (B) Hz/MW (C) Hz/MVA (D) rpm/MVAR
Last Answer : The unit of speed regulation of a governor is : Hz/MW
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226 views
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Apr 29, 2018
by
anonymous

Which motor has the best speed regulation?
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Mar 15, 2018
by
anonymous

In an actual transformer the iron loss remains practically constant from no load to full load because?
Last Answer : In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.
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Mar 19, 2018
by
anonymous

Last Answer : An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.
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204 views
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Mar 19, 2018
by
anonymous

For a transformer, operating at constant load current, maximum efficiency will occur at?
Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.
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124 views
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Mar 19, 2018
by
anonymous

The efficiency of two identical transformers under load conditions can be determined by?
Last Answer : The efficiency of two identical transformers under load conditions can be determined by back-to-back test.
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323 views
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Mar 19, 2018
by
anonymous

The maximum load that a power transformer can carry is limited by its?
Last Answer : The maximum load that a power transformer can carry is limited by its voltage ratio.
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133 views
1 answer
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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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156 views
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Mar 19, 2018
by
anonymous

Why is the phrase "Two can play at that game!" always referring to something negative?
Last Answer : That’s not what he meant last night. (waggle, waggle)
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Mar 2
by
anonymous

Do you have a positive attitude or a negative one?
Last Answer : I’m an “expect the worst, hope for the best” kind of person.
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Mar 2
by
anonymous

Do you feel Trump running the country as president is a positive or negative thing and why?
Last Answer : I think he's an idiot, a blowhard, and a liar. I think he is an illegitimate President, that only came to power because he's in some sort of cahoots, or pile of shit with the Russians, who interfered ... House. He's a fool, and bully. He does not care about the majority of Americans. He loves money.
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Mar 1
by
anonymous

Do cell-phones have more positive effects than negative effects?
Last Answer : answer:A Wikipedia article has this to say about health risks from cell phones: The effect mobile phone radiation has on human health is the subject of recent interest and study, as a result ... estimates, because the increase in brain cancers has not paralleled the increase in mobile phone use.
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Feb 28
by
anonymous

Do you consider yourself to be a positive person or a negative person and why?
Last Answer : I’m a pessimist no doubt. I constantly worry about the worst case scenario.
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Feb 27
by
anonymous
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Compare positive and negative feedback.
Last Answer : Sr. No. Parameter Positive feedback Negative feedback 1 BW Increases Decreases 2 Feedback signal In phase with the input signal. 180 º out of phase ... impedance increases decreases 9 Uses Oscillators, Schmitt trigger Amplifiers, bootstrapping
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Sep 3, 2019
by
anonymous

Write advantages and disadvantages of positive and negative feedback.
Last Answer : Advantages of Positive Feedback: i) Voltage gain increases. ii) No phase shift is provided. iii) Feedback signal and input signal are in phase. iv) Input and Output voltage increases. ... ii) Feedback signal and input signal are out of phase. iii) Input and Output voltage decreases.
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4.2k views
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Sep 5, 2018
by
anonymous

Differentiate between positive and negative feedback.
Last Answer : PARAMETER POSITIVE FEEDBACK NEGATIVE FEEDBACK Overall phase shift 0° or 360° 180° Feedback and input signal Are in phase Are out of phase Input signal ... Increases Input impedance Decreases Increases Output impedance Increases Decreases
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159 views
1 answer
asked
Sep 5, 2018
by
anonymous

Define negative and positive feedback
Last Answer : 1. Negative feedback: Feedback in which feedback signal is out of phase with input signal and it decreases output is called negative feedback. 2. Positive feedback: Feedback in which feedback signal is in phase with input signal and it increases output is called positive feedback.
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1 answer
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Sep 5, 2018
by
anonymous

The effect of negative feedback on distortion and bandwidth is A) Both distortion and bandwidth get decreased B) Both distortion and bandwidth get increased C) Distortion is reduced and bandwidth is increased D) Distortion is increased and bandwidth is decreased
Last Answer : The effect of negative feedback on distortion and bandwidth is Distortion is reduced and bandwidth is increased
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190 views
1 answer
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Jun 18, 2018
by
anonymous

A negative sequence relay is used for protection of (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines
Last Answer : A negative sequence relay is used for protection of Generator
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627 views
1 answer
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May 1, 2018
by
anonymous
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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.
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Apr 28, 2018
by
anonymous

Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode
Last Answer : Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode
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199 views
1 answer
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Apr 28, 2018
by
anonymous

Negative feedback in a closed-loop control system DOES NOT (A) reduce the overall gain (B) reduce bandwidth (C) improve disturbance rejection (D) reduce sensitivity to parameter variation
Last Answer : Negative feedback in a closed-loop control system DOES NOT reduce bandwidth
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229 views
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Apr 26, 2018
by
anonymous

The transducer with negative temperature co-efficient of resistance is (A) Thermistor (B) Resistance Thermometer (C) Strain Gauge (D) Thermocouple
Last Answer : The transducer with negative temperature co-efficient of resistance is Thermistor
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Apr 25, 2018
by
anonymous

Which side of a capacitor is negative?
Last Answer : In electrolytic type negative is shorter lead and usually mark in the tank. But of course not applicable to non-polar.
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Mar 15, 2018
by
anonymous

Is an anode positive or negative?
Last Answer : The anode is positively charged electrode.
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Mar 14, 2018
by
anonymous

Why does charge flow from positive to negative?
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0 answers
asked
Mar 14, 2018
by
anonymous
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How does negative feedback reduces distortion in an amplifier?
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282 views
0 answers
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Mar 10, 2018
by
anonymous

For given applied voltage, with the increase in frequency of the applied voltage?
Last Answer : For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.
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238 views
1 answer
asked
Mar 19, 2018
by
anonymous

The voltage transformation ratio of a transformer is equal to the ratio of?
Last Answer : The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.
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166 views
1 answer
asked
Mar 19, 2018
by
anonymous

If a transformer is switched on to a voltage more than the rated voltage?
Last Answer : If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.
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97 views
1 answer
asked
Mar 19, 2018
by
anonymous

What kind of feelings does the term "give back" bring to mind for you?
Last Answer : Good feelings. No matter how hard I’ve had it, there is always someone worse off than me, who I could be helping in however small a way. I think of it as sharing good fortune.
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Feb 27
by
anonymous

What destinations have you visited that exceeded your expectations & which were perhaps not what you envisaged?
Last Answer : answer:Better- Northern Wisconsin. I discovered a little town in northern Wisconsin when planning our first family vacation over 10 years ago. We originally planned on visiting Wisconsin Dells, but I wanted something a ... (sorry NYC fans) It was way too crowded for my liking, plus it smelled. :(
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1 answer
asked
Feb 27
by
anonymous
