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Negative voltage regulation is indicative that the load is?
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Negative voltage regulation is indicative that the load is capacitive.

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Description :

A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

Answer :

Leading

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Description :

Minimum voltage regulation occurs when the power factor of the load is?

Answer :

Minimum voltage regulation occurs when the power factor of the load is leading.

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Description :

A good voltage regulation of a transformer means?

Answer :

A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.

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Description :

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 under compound  (C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

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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94 views 1 answer
Description :

Define load and line regulation.

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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Description :

Answer :

The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.

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88 views 1 answer
Description :

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

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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178 views 1 answer
Description :

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

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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126 views 1 answer
Description :

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

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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Description :

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  

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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2.6k views 1 answer
Description :

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 :

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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144 views 1 answer
Description :

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

Answer :

A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular

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549 views 1 answer
Description :

Answer :

In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.

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92 views 1 answer
Description :

Answer :

In over compounded generator, full load terminal voltage is more than no load terminal voltage.

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Description :

Answer :

A transformer can have regulation closer to zero on leading power factor.

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119 views 1 answer
Description :

A ferro resonant transformer regulation is also known as?

Answer :

A ferro resonant transformer regulation is also known as constant current transformer.

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79 views 1 answer
Description :

Define line regulation and load regulation.

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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101 views 3 answers
Description :

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

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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242 views 1 answer
Description :

Answer :

An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

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Description :

The maximum load that a power transformer can carry is limited by its?

Answer :

The maximum load that a power transformer can carry is limited by its voltage ratio.

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Description :

Classify hydro-electric power plants according to water flow regulation and explain in brief.

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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Description :

The unit of speed regulation of a governor is :  (A) Hz (B) Hz/MW (C) Hz/MVA (D) rpm/MVAR

Answer :

The unit of speed regulation of a governor is : Hz/MW

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Description :

Which motor has the best speed regulation?

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Description :

Compare positive and negative feedback.

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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Description :

Write advantages and disadvantages of positive and negative feedback.

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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2.6k views 1 answer
Description :

Differentiate between positive and negative feedback.

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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117 views 1 answer
Description :

Define negative and positive feedback

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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80 views 1 answer
Description :

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 

Answer :

The effect of negative feedback on distortion and bandwidth is Distortion is reduced and bandwidth is increased

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Description :

A negative sequence relay is used for protection of  (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines

Answer :

A negative sequence relay is used for protection of Generator 

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462 views 1 answer
Description :

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

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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110 views 1 answer
Description :

Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode

Answer :

Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode

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75 views 1 answer
Description :

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

Answer :

Negative feedback in a closed-loop control system DOES NOT reduce bandwidth

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133 views 1 answer
Description :

The transducer with negative temperature co-efficient of resistance is (A) Thermistor (B) Resistance Thermometer (C) Strain Gauge (D) Thermocouple

Answer :

The transducer with negative temperature co-efficient of resistance is Thermistor

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68 views 1 answer
Description :

Which side of a capacitor is negative?

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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137 views 1 answer
Description :

Is an anode positive or negative?

Answer :

The anode is positively charged electrode.

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Description :

Why does charge flow from positive to negative?

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Description :

How does negative feedback reduces distortion in an amplifier?

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272 views 0 answers
Description :

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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85 views 1 answer
Description :

For a transformer, operating at constant load current, maximum efficiency will occur at?

Answer :

For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

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96 views 1 answer
Description :

The efficiency of two identical transformers under load conditions can be determined by?

Answer :

The efficiency of two identical transformers under load conditions can be determined by back-to-back test.

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146 views 1 answer
Description :

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

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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107 views 1 answer
Description :

In a transformer, zero voltage regulation at full load is   (a)Not possible   (b) Possible at unity power factor load   (c) Possible at leading power factor load   (d) Possible at lagging power factor load

Answer :

In a transformer, zero voltage regulation at full load is Possible at leading power factor load 

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384 views 1 answer
Description :

For given applied voltage, with the increase in frequency of the applied voltage?

Answer :

For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

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Description :

The voltage transformation ratio of a transformer is equal to the ratio of?

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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116 views 1 answer
Description :

If a transformer is switched on to a voltage more than the rated voltage?

Answer :

If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

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Description :

Answer :

The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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Description :

For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed

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Description :

In a battery, the difference between the no-load voltage and the measured voltage output is called ________ A) Internal voltage B) Internal resistance C) External resistance D) All the above

Answer :

In a battery, the difference between the no-load voltage and the measured voltage output is called Internal resistance

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94 views 1 answer
Description :

A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W

Answer :

A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W

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Description :

A network that consists of at least a voltage source or current source is called A) Active network B) Ideal network C) Sourced network D) Outsourced network

Answer :

A network that consists of at least a voltage source or current source is called Active network

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