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The encapsulation of transistor is necessary for mechanical ruggedness.

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0 answers 17 views

One of the necessary and sufficient condition for a network function N(s)=p(s)/q(s) to be a transfer function is that  A) The coefficients of the polynomial p(s) and q(s) must be real and those for q(s) must be positive B) Coefficients of p(s) and q(s) must be real and positive C) Coefficients of p(s) must be positive and real but coefficients of q(s) can be negative also D) Degree of p(s) and q(s) may differ by either zero or one only

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 17 views

For a transistor, Ceb=20pF, Ccb=5pF, re=1kOhm. Its figure of merit (in MHz) is about  A) 65 B) 650 C) 130 D) 13 

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 11 views

Which of the following is used extensively where lowest power consumption is necessary?  (1) CMOS (2) NMOS (3) PMOS (4) Any of the above

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

Knowledge of Transfer Function is necessary for the calculation of: - a) The Time Constant b) The output for a given input c) The steady state gain d) The order of the system

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
0 answers 19 views

The average time necessary for the correct sector of a disk to arrive at the read write head is  (1) Down time (2) Seek time (3) Rotational delay (4) Access time  

asked Apr 10, 2018 in Computer Engineering by Shimroz123
0 answers 17 views

For measuring the frequency of an unknown A.C. source. Which of the following device is necessary to obtain a standard waveform?  (A) Operational amplifier (B) Astable multivibrator (C) Schmitt trigger (D) Monostable multivibrator

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 21 views

Why biasing is required for a transistor?

asked Mar 10, 2018 in Electronics Engineering by Quiz
1 answer 20 views

The necessary and sufficient condition for a rational function of, T(s) to be driving point impedance of an RC network is that all poles and zeros should be

asked Apr 29, 2018 in Network Analysis by Shimroz123
0 answers 39 views

Explain the basic operation of an oscilloscope with necessary diagram for each section in detail.

asked Mar 2, 2018 in Digital Instrumentation by Quiz
0 answers 21 views

Attitude control in satellites is necessary for pointing to the desired regions on earth (a) the power supplies (b) the amplifiers (c) the directional antennas aboard (d) the motors

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 10 views

The set of transistor characteristics which enable α to be determined directly from the slope is (a) CB transfer characteristics (b) CE transfer characteristics (c) CB input characteristics (d) CE output characteristics

asked May 25, 2018 in Electronics Engineering by Shimroz123
1 answer 18 views

A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be

asked May 14, 2018 in Electronics Engineering by Shimroz123
1 answer 8 views

Beta cut-off frequency of a transistor is the frequency at which the Beta is • 0.707 of low frequency value • Zero • Equal to low frequency value • None of the above.

asked May 14, 2018 in Electronics Engineering by Shimroz123
0 answers 47 views

In IC fabrication, the common form of PNP transistor is  A) Vertical PNP B) Lateral PNP C) Triple diffusion PNP D) Substrate PNP

asked Apr 5, 2018 in Electronics Engineering by Shimroz123
1 answer 20 views

What is the main use of a transistor?

asked Mar 10, 2018 in Electronics Engineering by Quiz
1 answer 14 views

The 'h' parameter equivalent circuit of a junction transistor is valid for   (A) High frequency, large signal operation (B) High frequency, small signal operation (C) Low frequency, large signal operation.

asked May 17, 2018 in Power Electronics by Shimroz123
1 answer 18 views

Which of the following statements is wrong for transistor biasing methods:  1. The base resistor method does not provide stabilization of operating point 2. The biasing with feedback resistor provides only some stabilization 3. Base resistor method provides better stabilization than collector feedback method 4.Voltage divider bias is widely used because it has stable operating point

asked May 13, 2018 in Power Electronics by Shimroz123
0 answers 18 views

For an NMOS transistor, Vt= 2 V, Vgs= 3 V, Vdd= 10 V,µnCox=20 µA/V2 , L=10 meter, W= 400 µmeter. The drain current (in mA) is  A) 2 B) 1.2 C) 0.4 D) 0.2

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 17 views

What is thermal runaway of a transistor?

asked Mar 10, 2018 in Electronics Engineering by Quiz
0 answers 19 views

What is self biasing of transistor?

asked Mar 10, 2018 in Electronics Engineering by Quiz
0 answers 10 views

In a transistor Colpitts oscillator, C1 = 0.001 µF, C2 = 0.01 µF and L = 5 µH. The frequency of oscillation in MHz will be (a) 2.37 MHz (b) 10.00 MHz (c) 11.54 MHz (d) 9.09 MHz 

asked May 25, 2018 in Electronics Engineering by Shimroz123
1 answer 18 views

In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: (1) 10 µA (2) 100 µA (3) 1 A (4) 10 A 

asked May 29, 2018 in Electronics Engineering by Shimroz123
0 answers 20 views

Give some typical value of generated voltage in a power station. Why is it necessary to step up the voltage further before transmitting?

asked Apr 3, 2018 in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by Shimroz123
1 answer 24 views

To determine the polarity of the voltage drop across a resistor, it is necessary to know?

asked Mar 25, 2018 in Network Analysis by Shimroz123
1 answer 7 views

A transistor has ________ number of terminals. (A) 2 (B) 3 (C) 1 (D) 4 

asked Apr 23, 2018 in Electronics Engineering by Shimroz123
0 answers 22 views

Maximum junction temperature and maximum ambient temperature of a power transistor (in degree Centigrade) are 150 and 52. The set level power dissipation is 32 watts, transistor thermal factor is 0.7 and of mica washer is 0.5.Thermal resistivity of heat sink (in degree C/W) is  A) 1.8 B) 3.2 C) 6.4 D) 9.8

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 13 views
0 answers 21 views

What is meant by stabilization in transistor?

asked Mar 10, 2018 in Electronics Engineering by Quiz
1 answer 11 views

In an npn transistor, _____ are the minority carriers.   (a) Free electrons (b) Acceptor ions (c) Donor ions (d) Holes

asked May 13, 2018 in Electronics Engineering by Shimroz123
1 answer 15 views

With the help of necessary sketch, explain in brief the working of brushless DC motor. 

asked Sep 15, 2018 by Shimroz123
1 answer 38 views

Explain with necessary diagram the earth fault protection of power and auxiliary circuit.

asked Sep 12, 2018 by Shimroz123
1 answer 50 views

Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
1 answer 38 views

 Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
1 answer 22 views

Which one of the following is another name for common-collector amplifier?  A) Source follower B) Collector follower C) Base follower D) Emitter follower

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
1 answer 13 views

Which of the following oscillators is used for generation of high frequency signal ? (a) RC phase shift oscillator (b) Blocking oscillator (c) Wein bridge oscillator (d) L-C oscillator 

asked May 26, 2018 in Electronics Engineering by Shimroz123
1 answer 16 views

For a series resonant circuit, at the half power points,which of the following is true?  (a) Current is half of the current at resonance. (b) Resistance is equal to the reactance. (c) The impedance is half the impedance at the resonance. (d) None of the above

asked May 16, 2018 in Electronics Engineering by Shimroz123
1 answer 12 views

The condition for parallel operation of two inverters is • Amplitude of voltages should be same. • Frequency of voltages should be same. • Both the voltages should be in same phase. • All the three above.

asked May 14, 2018 in Electronics Engineering by Shimroz123
1 answer 14 views

For a rotameter, which one of the following statements is TRUE? (A) The weight of the float is balanced by the buoyancy and the drag force acting on the float (B) The velocity of the fluid remains constant for all positions of the float (C) The measurement of volume flow rate of gas is not possible (D) The volume flow rate is insensitive to changes in density of the fluid

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
0 answers 21 views

The RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB . For overall noise figure of the cascaded system, the correct statement is :  a. A as first stage & B as second stage offers minimum over all NF b. B as first stage & A as second stage minimum over all NF c. Both the combination will offer same overall NF d. Over all NF will be less than 3 dB.

asked Apr 12, 2018 in Electronics Engineering by Shimroz123
0 answers 12 views

 For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma=1) is : ( Given fm = 15 KHz & frequency. deviation =+/- 75 KHz) a. 112.5 b. 300 c. 75 d. 450

asked Apr 12, 2018 in Electronics Engineering by Shimroz123
0 answers 9 views

For various types of oscillators, the correct statement is : a. LC oscillators are more stable than crystal oscillators b. Crystal oscillators have highest Q c. Phase -shift oscillators have the widest range of frequency d. Wien bridge oscillator is used where a single frequency oscillator is required

asked Apr 12, 2018 in Electronics Engineering by Shimroz123
1 answer 30 views

A 4-bit R/2R digital-to-analog (DAC) converter has a reference of 5 volts. What is the analog output for the input code 1010:  (1) 0.3125 V (2) 3.125 V (3) 0.78125 V (4) –3.125 V

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 29 views

Which of the following semiconductor materials is (are) used for manufacturing solar cells?  (1) Gallium arsenide (2) Indium arsenide (3) Cadmium sulfide (4) All of these

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 23 views

If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is nearly:  (1) 8.24 KW (2) 9.26 KW (3) 8.47 KW (4) 9.6 KW

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 10 views

What is the cause for light or dark recording of EEG?  A) Pen is not touching properly B) Ink tubes are clogged C) Incorrectly loaded paper D) Lead connection problem

asked Apr 9, 2018 in Electronics Engineering by Shimroz123

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