Recent questions and answers in Electronics Engineering

2 answers 37 views

11001, 1001 and 111001 correspond to the 2’s complement representation of which one of the following sets of number?  (1) 25, 9 and 57 respectively (2) –6, –6 and –6 respectively (3) –7, –7 and –7 respectively (4) –25, –9 and –57 respectively

answered Jul 7 in Electronics Engineering
1 answer 57 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

answered Jun 4 in Electronics Engineering
1 answer 84 views

For biomedical applications the mostly used amplifier is  A) Single ended amplifier B) Differential amplifier  C) Inverting operational amplifier D) Chopper amplifier

answered Jan 15 in Electronics Engineering
2 answers 74 views

What type of instrument is used to measure dc voltage of the order 5 volts? (A) moving iron type (B) electro-static type (C) moving coil type (D) all of these

answered Nov 15, 2018 in Electronics Engineering
1 answer 46 views

How do you charge a capacitor with a battery?

answered Aug 16, 2018 in Electronics Engineering
2 answers 64 views

How can you identify a zener diode?

answered Aug 16, 2018 in Electronics Engineering
1 answer 46 views

A waveguide termination having VSWR of 1.1 is used to dissipate 100 watts of power. The reflected power will be A) 0.2268 W B) 0.5868 W C) 0.3468 W D) 0.4568 W 

answered Jun 18, 2018 in Electronics Engineering
1 answer 35 views

TWT is basically a(n) A) Amplifier B) An oscillator C) Wideband amplifier D) Tuned amplifier 

answered Jun 18, 2018 in Electronics Engineering
1 answer 50 views

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

answered Jun 18, 2018 in Electronics Engineering
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 

answered Jun 18, 2018 in Electronics Engineering
1 answer 38 views

Calculate the size of memory address space for a 16 bit data and 20 bit address bus. A) 1 MB B) 2 MB C) 3 MB D) 4 MB

answered Jun 18, 2018 in Electronics Engineering
1 answer 83 views

The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as A) Turnaround time B) Latency time C) Access time D) Response time

answered Jun 18, 2018 in Electronics Engineering
1 answer 26 views

The command line interpreter that enables the users to interact with operating system is called the A) Window B) Shell C) Process D) Kernel 

answered Jun 18, 2018 in Electronics Engineering
1 answer 19 views

 What is the size of SP register in 8085 microprocessor? A) 16 bits B) 8 bits C) 64 bits D) 48 bits

answered Jun 18, 2018 in Electronics Engineering
1 answer 27 views

The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W 

answered Jun 18, 2018 in Electronics Engineering
1 answer 17 views

Which waves are demodulated by Costas loop? A) VSB B) SSB C) MSK D) DSBSC 

answered Jun 18, 2018 in Electronics Engineering
1 answer 33 views

What is the channel capacity of a noisy channel with conditional probability of error p = 1/2? A) 0 B) 1 C) Infinity D) 2  

answered Jun 18, 2018 in Electronics Engineering
1 answer 33 views

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

answered Jun 18, 2018 in Electronics Engineering
1 answer 40 views

 If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be A) Large in amplitude B) Small in amplitude C) Distorted D) Distortion less

answered Jun 18, 2018 in Electronics Engineering
1 answer 343 views

What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz

answered Jun 18, 2018 in Electronics Engineering
1 answer 37 views

As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by (symbols/notations carry their usual meaning) A) B/T B) T/B C) 2BT D) BT/2 

answered Jun 18, 2018 in Electronics Engineering
1 answer 34 views

The second harmonic distortion is defined as the A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency B) Harmonic distortion due to only second harmonic component C) Sum of distortion of first and second harmonic components in the output 

answered Jun 18, 2018 in Electronics Engineering
0 answers 45 views

The sampling rate to avoid aliasing for the signal m(t) = 100 cos 200ωt will be A) ≥1/25 sec B) ≥1/50 sec C) ≤1/25 sec D) ≤ 1/50 sec

asked Jun 18, 2018 in Electronics Engineering
1 answer 24 views

 An energy signal has G(f) = 20. Its energy density spectrum is A) 20 B) 100 C) 400 D) 800  

answered Jun 18, 2018 in Electronics Engineering
1 answer 46 views

What does double integration of a unit step function lead to? A) A doublet B) A ramp C) An impulse D) A parabola 

answered Jun 18, 2018 in Electronics Engineering
1 answer 44 views

What is the Fourier transform of a Gaussian time pulse? A) Uniform B) Gaussian C) Impulses D) Pulse

answered Jun 18, 2018 in Electronics Engineering
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 

answered Jun 18, 2018 in Electronics Engineering
1 answer 37 views

 An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

answered Jun 18, 2018 in Electronics Engineering
1 answer 18 views

What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

answered Jun 18, 2018 in Electronics Engineering
1 answer 8 views

What is a Schmitt trigger? A) A trigger circuit B) A comparator with Hysteresis C) A comparator without Hysteresis D) Amplifier

answered Jun 18, 2018 in Electronics Engineering
1 answer 20 views

Which of the following circuits converts any arbitrary waveform into square waveform? A) Hartley oscillator B) Schmitt trigger C) Differentiator D) RC phase shift oscillator 

answered Jun 18, 2018 in Electronics Engineering
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

answered Jun 18, 2018 in Electronics Engineering
1 answer 22 views

Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor C) Sensistor D) Pyrometer 

answered Jun 17, 2018 in Electronics Engineering
1 answer 14 views

Which of the following materials is used in the construction of thermistors? A) Pure metal B) Pure semiconductor C) Pure insulator D) Sintered mixture of metal oxides 

answered Jun 17, 2018 in Electronics Engineering
1 answer 14 views

 In thermo-couple instruments, in which of the following is an emf caused if the junction of two wires of dissimilar metals is heated and the free or cold ends are connected to a milli-voltmeter? A) Kelvin effect B) Hot wire effect C) Seebeck effect D) Faraday effect 

answered Jun 17, 2018 in Electronics Engineering
1 answer 10 views

How can we protect circuit from reverse voltage polarity?

answered Jun 15, 2018 in Electronics Engineering
1 answer 10 views

In a microwave magic-T, E plane and H plane are  a) In phase b) Out of phase c) Isolated d) 90o out of phase

answered Jun 15, 2018 in Electronics Engineering
1 answer 14 views

Slotted line with tunable probe is not used to measure  a) VSWR b) Wavelength c) Power d) Impedance

answered Jun 15, 2018 in Electronics Engineering
1 answer 10 views

When electromagnetic waves are propagated in a waveguide  a) They travel along the walls of the waveguide b) They travel through the dielectric without touching the walls c) They are reflected from the walls but do not travel along the walls d) None of these

answered Jun 15, 2018 in Electronics Engineering
1 answer 10 views

The following quantity is not required in the calculation of Q of a cavity resonator  a) Energy stored b) Power dissipated c) Loss in radiation d) Dimensions of the cavity

answered Jun 15, 2018 in Electronics Engineering
1 answer 18 views

The following is not an application of varactor diode:  a) Parametric amplifier b) Frequency tuner c) Voltage controlled oscillator d) Phase shifter

answered Jun 15, 2018 in Electronics Engineering
1 answer 15 views

Klystron operation is based on the principle of  a) Velocity modulation b) Amplitude modulation c) frequency modulation d) Phase modulation

answered Jun 15, 2018 in Electronics Engineering
1 answer 7 views

An elliptically (arbitrarily polarized wave c an be broken up into  a) Two circularly polarized components rotating in same direction b) Two circularly polarized components rotating in opposite directions c) Two stationary circularly polarized components d) None of these

answered Jun 15, 2018 in Electronics Engineering
1 answer 10 views

For an earth station transmitter, with an antenna output power of 40dBW 10,000W, a back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and feeder loss of 3dB and transmit antenna gain of 4dB, the effective isotropic radiated power (EIRP will be  a) 38dBW b) 40 dBW c 36 dBW d) 47 dBW

answered Jun 15, 2018 in Electronics Engineering
1 answer 12 views

In communication systems, noise due to quantization error is a) Linear and signal dependent b) Non-linear and signal dependent c) Linear and signal independent at low frequencies only d) non -linear and signal dependent at low frequencies only

answered Jun 15, 2018 in Electronics Engineering
1 answer 10 views

The threshold effect in demodulators is a) The rapid fall of output SNR when the input SNR falls below a particular value b) Exhibited by all the demodulators when the input SNR is low c) Exhibited by all AM suppressed carrier coherent demodulators d) Exhibited by correlation receivers

answered Jun 15, 2018 in Electronics Engineering
1 answer 148 views

For a prototype low pass filter, the series and shunt elements are respectively _____.

answered May 29, 2018 in Electronics Engineering
1 answer 6 views

Attenuation in a network in decibels is equal to _____.

answered May 29, 2018 in Electronics Engineering
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