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in Electronics Engineering by
An amplifier which has almost same gain and input resistance of a CE amplifier but of higher bandwidth is 

A) Cascode amplifier B) Cascade amplifier C) Darligton amplfier D) CC amplifier

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1 answer 25 views

An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ

asked May 29, 2018 in Amplifier by Shimroz123
0 answers 8 views

Which of the following amplifier configurations has the lowest input resistance?  A) Common Emitter B) Common Base C) Common Collector D) Emitter Follower

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 64 views

An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be

asked May 3, 2018 in Power Electronics by Shimroz123
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A dominant pole compensated op-amp has openloop gain of 100 dB and -3 dB bandwidth of 50 Hz. If it is connected as inverting amplifier for a gain of 20 dB the -3 dB bandwidth is about  A) 500 kHz B) 50 kHz C) 5 kHz D) 500 Hz

asked Apr 5, 2018 in Electronics Engineering by Shimroz123
1 answer 8 views

Define gain and bandwidth of an amplifier.

asked Sep 5, 2018 by Shimroz123
1 answer 58 views

A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
0 answers 20 views

For a CE amplifier, operating current is 1mA, load resistance is 5 kOhm.The forward bias capacitance is 50 nF and reverse bias capacitance is 10 nF. Total input capacitance in nF is around  A) 40 B) 60 C) 500 D) 2000

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 26 views

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

asked Jun 18, 2018 in Amplifier by Shimroz123
0 answers 12 views

With the introduction of negative feedback, the gain—bandwidth product of an amplifier  A) Becomes infinity B) Increases C) Decreases D) Remains constant

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 28 views

An amplifier without feedback has a gain of 1000. The gain with a negative feedback of 0.009 is  A) 10 B) 100 C) 125 D) 900

asked May 20, 2018 in Amplifier by Shimroz123
1 answer 34 views

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

asked May 1, 2018 in Power Electronics by Shimroz123
0 answers 11 views

An emitter resistor is included in CE amplifier to increase  A) Gain B) Bandwidth C) S/N D) Stability

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 11 views

Bandwidth of an RC coupled amplifier is 100 kHz. Two such amplifiers are connected in cascade.Resultant bandwidth(in kHz) is around  A) 200 B) 100 C) 60 D) 30

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 6 views

Rise time of an amplifier is found to be 1.0µS, its bandwidth (in kHz) is around  A) 2200 B) 1000 C) 350 D) 220 

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

The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
1 answer 35 views

Potier reactance of an alternator is almost the same as   (a) Field winding reactance (b) Total armature reactance (c) Leakage reactance of field winding (d) Armature leakage reactance

asked May 13, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

An amplifier has a voltage gain of 50; this gain in dB will be (A) 34 dB (B) 68 dB (C) 41 dB (D) 14 dB 

asked Apr 23, 2018 in Instrumentation and control by Shimroz123
1 answer 55 views

What device is similar to an RTD but has a negative temperature coefficient?  A) Strain gauge B) Thermistor C) Negative-type RTD D) Thermocouple

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

A oscilloscope 4cmX4cm screen has its own sweep out, fed back to its input if x&y Sensitivities are same, the oscilloscope will display  A) triangular wave B) diagonal line C) sine wave D) Circle

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 16 views

If three amplifiers having the same bandwidth are cascaded, the bandwidth of the resulting amplifier will be (a) Better than that of each stage (b) Worse than that of each stage (c) Same as that of each stage (d) None of the above 

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 86 views

 When The dc converter in figure shown has a resistance load of R = 10 Ω and the input voltage is Vs 220 V the converter switch remains on, its voltage drop is Vo -2 V. The chopping frequency is fI K sW Vs If the duty cycle is 50%, determine: (a) the average output voltage V (b) the RMS output voltage Vo (c) the converter efficiency (d) the effective input resistance of the converter

asked Apr 26 by Hussein
1 answer 36 views

A piezo-electric type pressure sensor has a sensitivity of 1 mV/kPa and a bandwidth of 300 Hz to 300 kHz. For a constant (dc) pressure of 100 kPa, the steady state output of the sensor in millivolt is (A) 0 (B) 2 (C) 4 (D) 6

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
0 answers 15 views

The total output offset voltage for a noninverting amplifier with input resistance 1 kOhm , feedback resistance 10 k Ohm, input offset voltage 10 mV and input bias current 100 nA is, about  A) 25 mV B) 55 mV C) 110 mV D) 220 mV

asked Apr 5, 2018 in Electronics Engineering by Shimroz123
1 answer 11 views

An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is  A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts

asked May 20, 2018 in Amplifier by Shimroz123
1 answer 14 views

An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is (A) 0 to 2.76 (B) 0 to 9.81 (C) 0 to 11.20 (D) 0 to 52.10

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
1 answer 34 views

If the feedback factor of an amplifier is 0.1 and its gain without feedback is 40, then its gain with feedback is (a) – 13.3 (b) 200 (c) 8 (d) 10 

asked May 25, 2018 in Amplifier by Shimroz123
1 answer 15 views

An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C

asked May 23, 2018 in Amplifier by Shimroz123
1 answer 16 views

When an antenna of input resistance 73 ohm is connected to a 50-ohm line and if the losses are ignored then its efficiency will be nearly   (A) 0.19 (B) 0.81 (C) 0.97 (D) 1.19

asked May 17, 2018 in Electronics communication by Shimroz123
1 answer 13 views

A certain common-emitter amplifier has a voltage gain of 100. If the emitter bypass capacitor is removed.  a. The circuit will become unstable b. The voltage gain will decrease  c. The voltage gain will increase d. The circuit will become stable

asked Aug 31, 2018 by Shimroz123
1 answer 93 views

A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by

asked May 3, 2018 in Power Electronics by Shimroz123
1 answer 43 views

The hot resistance of a bulb’s filament is higher than its cold resistance because the temperature coefficient of the filament is:

asked Mar 28, 2018 in Electronics Engineering by Shimroz123
1 answer 18 views

In an R-2R ladder D/A converter, the input resistance is  1. Not same for all digital inputs 2. R for each input 3. 2R for each input 4. 3R for each input 

asked May 13, 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
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 7 views

One input terminal of high gain comparator circuit is grounded and a sinusoidal voltage is applied to the other input. The output of comparator will be___________.

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

An ammeter has a current change of 0—5A and its internal resistance is 0.2 ohm. In order to Change the range to 0-25 A, wear need to add a resistance of  A) 0.8 ohm in series with the meter B) 1.0 ohm in series with the meter C) 0.04 ohm in parallel with the meter D) 0.05 ohm in parallel with the meter

asked May 20, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 14 views

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

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 49 views

A high-pass filter has a resistance R = 2 kΩ The lowest input frequency to be passed is 7.5 kHz. The value of suitable coupling capacitor must be: A) 0.001 pico Farad B) 0.01 pico Farad C) 0.1 pico Farad D) 1 pico Farad

asked Jun 4, 2018 in Electrical Engineering by Shimroz123
0 answers 39 views

For a symmetrical emitter coupled differential amplifier using transistors of current gain 100, constant current source of 2 mA and with Vcc=10 V, differential input resistance in kOhm is about  A) 2.5 B) 5 C) 10 D) 50

asked Apr 5, 2018 in Electronics Engineering by Shimroz123
0 answers 19 views

What type of biasing is used in CE amplifier?

asked Mar 22, 2018 in Transistor Biasing by Quiz
1 answer 36 views

The response of an LTI/LSI system is given by the _______ of input and impulse response:  (1) Convolution (2) Correlation (3) Superposition (4) None

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 11 views

Which DOS command displays all the files having the same name but different extensions?  (1) Dir filename.* (2) Dir filename.ext (3) Dir *.sys (4) Dir *.ext  

asked Apr 11, 2018 in Computer Engineering by Shimroz123
1 answer 205 views

An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to  (1) 1.414 times dc sensitivity (2) dc sensitivity (3) 0.9 times dc sensitivity (4) 0.707 times dc sensitivity

asked Apr 30, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 11 views

In a klystron amplifier the input cavity is called:  (1) Buncher (2) Catcher (3) Pierce gun (4) Collector

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 17 views

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the?

asked Mar 20, 2018 in DC motor by Shimroz123
0 answers 19 views

Semiconductor A has a higher band gap than semiconductor B. If both A and B have the same dimensions, the same number of electrons at a given temperature and the same electron and hole mobilities, then

asked Mar 31, 2018 in Electronics Engineering by Shimroz123
1 answer 17 views

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123

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