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Electrical & Electronics Engg

Model Solved Paper

(For Various Competitive Exams)

Q.1.Which of the following is the ideal characteristics of OP-AMP

• Bandwidth is zero
• Offset voltage is infinite
• Output voltage is infinite
• CMMR is infinite

Q.2.A signal has frequency components from 300Hz to 2 kHZ.The minimum possible rate at which the signal has to be sampled

• 600Hz
• 900Hz
• 2kHz
• 4Khz

Q.3.Negative feed back in amplifiers is used to

• Improves the SNR at the input
• Improves the SNR at the output
• Reduces distortion
• Doesn’t effect the SNR at the output

Q.4.In PCM system, if the quantization levels are increased from 2 to 8, the relative bandwidth requirement will.

• remain same
• be doubled
• be tripled
• become four times

Q.5.Fulladder consists of

• 1 half adder and 1 AND gate
• 2 Half adders and 1 XOR gate
• 1 Half adder and 1 OR gate
• 2 Half adders and 1 OR gate

Q.6.Flipflop is a

• Monostable
• Bistable
• Astable
• None of these

Q.7.For a 8 bit counter the number of filp flops required is

• 2
• 4
• 3
• 1

Q.8.In 8085 microprocessor The data bus has

• Unidirectional
• Bi-directional
• Both
• None of these

Q.9.The number of hardware interrupts in 8085 Microprocessors

• 2
• 4
• 3
• D. 5

Q.10.Which of the following is used for Wider bandwidth in amplifiers

• Cascade connection
• Darlington
• Cascode connection
• Both A and B

Q.11.When modulation changed from 0 to 1 then power increases by

• 20%
• 40%
• 50%
• 90%

Q.12.The highest modulation frequency typically used in AM broadcast is

• 5KHz
• 10kHz
• 15kHz
• 22kHz

Q.13.Time division multiplexing used in

• Analog communication
• Digital communication
• Both A and B
• None of these

Q.14.In a delta modulation the slope overload and Granular noise occurs when

• small an ? small
• ? large and ? small
• ? small and ? large
• ? large and ? large

Q.15.Convert decimal number (0.8125)10 to a binary number

• (0.1101)2
• (0.1001)2
• (0.1100)2
• (0.1111)2

Q.16.Gray code is also called as

• Cyclic code
• Reflected code
• Both A and B
• None of these

Q.17.Common base amplifier has

• High input impedance
• High output impedance
• Low output impedance
• None

Q.18.In negative feedback the distortion will

• Increase
• Decrease
• Some times increase some times decrease
• None of the above

Q.19.Barkausens criteria is

• Aß=1
• Aß=-1
• Both A and B
• None

Q.20.Which of the following is more stable

• Wien bridge oscillator
• Crystal oscillator
• RC oscillatory
• Colpitts Oscillator

Q.21.The forbidden energy gap for germanium atom

• 1.1 ev
• 0.7 ev
• 0.3 ev
• None

Q.22.Maxwell’s curl equation for state magnetic field is given by

• ?xB=µ0J
• ?xB=0
• ?.B=µ0J
• ?xB=µ0/J

Q.23.For reflection coefficient ?=0.5,VSWR is

• 2
• 3
• 4
• 8

Q.24.The unit of µ0e0 is

• Farad henry
• Meter2/sec2
• Amp-sec
• None

Q.25.A low loss transmission line has

• R=wl, G=wC
• R<<wL, G<<wC
• R>>wL, G>>wC
• None

Q.26.Which of the following has longest wavelength

• HF
• VHF
• UHF
• SHF

Q.27.For a good conductor, the skin depth varies:

• Directly as frequency f
• Directly as √f
• Inversely as √f
• None

Q.28.An antenna that is circularly polarized is

• Helical
• Yagi-uda
• Parabolic
• Small circular loop

Q.29.In series resonance circuit the voltage source is

• Low resistance
• High resistance
• Zero resistance
• None of the above

Q.30.A network is non linear if it doesn’t satisfy

• Homogeneity
• Superposition theorem
• Associative condition
• Both A and B

Q.31.The gray code for number 6 is

• 1100
• 1001
• 0101
• 0110

Q.32.What is the addressing mode used in instruction LDA 0345

• Direct
• Indirect
• Immediate
• Indexed

Q.33.How many modes of operations are there in 8255 PPI?

• 1
• 2
• 3
• 4

Q.34.Which of the following has lowest efficiency

• Class A
• Class B
• Class AB
• Class C

Q.35.The differential amplifier has a differential gain of 20000 CMRR=80dB. The common mode gain is

• 2
• 1
• 0.5
• 0

Q.36.Super-beta transistor is a

• Cascade configuration
• Cascode configuration
• Darlington configuration
• Matched pair

Q.37.To eliminate ghosts in the picture

• Use a longer transmission line
• Connect a booster
• Change the antenna orientation or location
• Twist the transmission line

Q.38.Vividh bharati programme is transmitted in

• Short waves
• Medium frequency
• Very high frequency
• None

Q.39.The double energy transients occur in the

• R-L circuit
• R-C circuit
• Pure inductive circuit
• R-L-C circuit

Q.40.The unit of flux is

• Weber
• Tesla
• Joule
• Weber/m2

Q.41.The transfer function H(s)=(s2-5s+100)/s2+5s+100 represents

• A high pass filter
• A band elimination filter
• A resonator
• An all pass filter

Q.42.Double spotting in superhetrodyne receiver is caused by

• Poor front-end rejection
• Misalignment of receiver
• Detuning of one or more IF stages
• Non-functioning of AGC

Q.43.The ratio of distance between cochannel to radius of the cell (D/R)is

• N
• √N
• 3√N
• √(3N)

Q.44.MAHO stands for

• Mobile additive hand off
• Mobile assisted Hand off
• Mounted additive hand off
• None of the above

Q.45.Traffic intensity is measured by

• Traffic
• Erlangs
• Seconds
• Decibels

Q.46.Frequency selective fading means

• Band width of the signal is greater than the band width of the channel
• Delay speed is greater than symbol speed
• Both A and B
• None of these

Q.47.HLR stands for

• Home localized rectifier
• Home location register
• Home loyality register
• None

Q.48.A receiver has poor if selectivity,it will therefore also have poor

• Blocking
• Double spotting
• Diversity reception
• Sensitivity

Q.49.The number of lines per second in the US monochrome TV system

• 31,500
• 15,750
• 63.5
• 525

Q.50.An LED made using GaAs emits radiation in

• Visible region
• Ultraviolet region
• Infrared region
• Microwave frequency region

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