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In which material, valence electrons are tightly bounded to their parent atoms ? (a) Conductor (b) Semiconductor (c) Insulator (d) Magnetic 

asked May 26, 2018 in Physics by Shimroz123
0 answers 350 views

Why thyristor are not preferred for inverter?

asked Mar 19, 2018 in Thyristor by Quiz
1 answer 31 views

Which of the following elements are used as dopants in silicon or germanium semiconductors? A) Antimony B) Phosphorus C) Arsenic D) All the above

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

Consider the following statements. Which of these statements are correct ?  (1) Reactance relays are preferred for ground fault relaying  (2) Impedance relays are most suitable for:protecting long transmission lines  (3) Mho relays are best suited for long transmission line protection  (4) Reactance relays are widely used for protection of Medium transmission lines  (A) All of them (B) (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 33 views

Why do transformers make noise?

asked Dec 17, 2017 in Switchgear And Protection by Quiz
0 answers 21 views

A material has conductivity of 10–2 mho/m and relative permittivity of 4. The frequency at which the conduction current in the medium is equal to the displacement current, is (a) 450 MHz (b) 900 MHz (c) 45 MHz (d) 90 MHz

asked May 25, 2018 in Physics by Shimroz123
1 answer 115 views

In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 

asked May 8, 2018 in Electric Power Transmission by Shimroz123
0 answers 13 views

Both donor and acceptor impurities are present in the combination of (a) Phosphorous - Arsenic (b) Aluminium - Antimony (c) Boron - Gallium (d) Arsenic - Antimony

asked May 25, 2018 in Physics by Shimroz123
0 answers 107 views

Three materials X, Y and Z having relative permittivity 2.5, 3.0 and 4.0 respectively are used in a single core cable. The materials on inner most and outer most layer respectively should be (a) X and Y (b) Y and Z (c) X and Z (d) Z and X 

asked May 25, 2018 in Physics by Shimroz123
0 answers 11 views

Angles project true size only when the plane containing the angle and plane of projection are  (a) Aligned (b) Adjacent (c) Perpendicular (d) Parallel

asked Apr 9, 2018 in Physics by Shimroz123
0 answers 42 views

Why is pulse train gating preferred over pulse gating? Explain with relevant circuit and waveforms, the pulse train gating of SCRs.

asked Mar 11, 2018 in Power Electronics by Quiz
0 answers 34 views
1 answer 23 views
1 answer 110 views

Explain the series and parallel operation of MOSFET. Which is suitable and why?

asked Sep 15, 2017 in Unit 1 by Quiz
1 answer 17 views

State why nuclear power plants are used as base load plants and diesel power plants as a peak load plant. 

asked Sep 8, 2018 by Shimroz123
1 answer 12 views

Name two good conductors, two good insulators, and two semiconductors.

asked Jun 29 by Shimroz123
0 answers 75 views
1 answer 86 views

How do magnets and copper wire make electricity?

asked Mar 10, 2018 in Electric Power Generation by Quiz
0 answers 19 views

For blowers which of the following motor is preferred? (1) D.C. series motor (2) D.C. shunt motor (3) Squirrel cage induction motor (4) Wound rotor induction motor  

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 32 views

Which of the following circuit breakers is preferred for EHT application: -  a) Air blast circuit breakers b) Minimum oil circuit breakers c) Bulk oil circuit breakers d) SF6 oil circuit breakers

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

Which amplifier will be preferred for highest gain?  (1) Darlington pair (2) Cascade amplifier (3) Cascode amplifier (4) Depends on the circuitry

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 32 views

Impurity atoms to be added to pure silicon in order to make a p-type semiconductor belongs to (a) Phosphorous (b) Boron (c) Antimony (d) Aluminium 

asked May 25, 2018 in Semiconductor by Shimroz123
1 answer 39 views

Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

asked Apr 30, 2018 in Control System by Shimroz123
1 answer 12 views

The iron alloy, ALNICO is mainly used to make ________ A) Temporary magnets B) Permanent magnets C) Transmission lines D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 26 views

An audit trail  (1) is used to make backup copies (2) is the recorded history of operations performed on a file (3) can be used to restore lost information (4) none of these

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 17 views

Transformer coupling is used in class A amplifier to make it : -  a) more efficient b) less bulky c) less costly d) distortion free

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
1 answer 9 views

 To turn a conducting SCR to off state, it is necessary to make : -  a) anode current less than holding current b)gate current zero  c) anode voltage less than break over voltage  d) gate voltage zero

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
0 answers 20 views

A synchronous machine connected to a power system grid bus-bar is operating as a generator. To make the machine operate as a motor, the  (1) direction of rotation is to be reversed (2) phase sequence is to be changed (3) field excitation is to be decreased (4) mechanical input is to be less than the losses at the shaft

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 68 views

How to make power bank from laptop battery cells?

asked Mar 8, 2018 in Electronics Project by Quiz
1 answer 15 views

 DC motors are still preferred for use in: -  a) Electric excavators steel mills and cranes b) Lathes and machine tools c) Flour mills and jaw crushers d) Paper industry

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
0 answers 453 views

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

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
0 answers 10 views

Moving coil instruments have which one of the following scales ? (a) Logarithmic scale (b) Uniform scale (c) Non-uniform scale (d) Squared scale 

asked May 26, 2018 in Physics by Shimroz123
0 answers 13 views

If temperature of a radiating body is 1500 °C, the wavelength at which maximum radiant energy occurs is (a) 2.87 µm (b) 1.63 µm (c) 1.01 µm (d) 20.85 µm 

asked May 25, 2018 in Physics by Shimroz123
2 answers 29 views

In a metal wire, which particle carries electric current?

asked May 15, 2018 in Physics by Shimroz123
1 answer 18 views

Which of the following is true regarding the band-gap energy of a semiconductor ? (A) Minimum energy required to break a covalent bond (B) On breaking of the bond, electron is generated (C) On breaking of the bond, electron-hole pair is generated (D) A & C both are true

asked May 12, 2018 in Physics by Shimroz123
1 answer 55 views

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

asked Apr 28, 2018 in Physics by Shimroz123

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