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Exam Details

2021 Electronics and Telecommunication Engineering

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Questions 150
Duration 180 mins
Package Indian Economic Service and Indian Statistical Service Examination - Previous Year Papers

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Showing all 150 questions in this paper.

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Difficulty distribution

Medium 50 33.3%
Hard 50 33.3%
Easy 50 33.3%

Question type distribution

Multiple Choices 150 100%

Syllabus

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Sample questions from this paper

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1
2021 · Unclassified
2021 Electronics and Telecommunication Engineering
A single-phase full wave rectifier uses semiconductor diodes. The transformer voltage is 35,V rms to center tap. The load consists of a 40 μF capacitor in parallel with a 250 Ω resistor. The diode and transformer resistances and leakage reactance are neglected. If the power line frequency is 50 Hz, the dc current in the circuit will be
A
132 mA
B
144 mA
C
156 mA
D
168 mA
2
2021 · Unclassified
2021 Electronics and Telecommunication Engineering
Silicon dioxide (SiO2) is used in ICs, because it
A
Facilitates the penetration of diffusants
B
Has high heat conduction
C
Prevents diffusion of impurities
D
Controls the concentration of diffusants
3
2021 · Unclassified
2021 Electronics and Telecommunication Engineering
Consider an n-channel MOSFET with parameters : Kn = 0·25 mA/V2, VTN = 1 V, λ = 0, Cgd = 0·04 pF and Cgs = 0·2 pF If the transistor is biased at VGS = 3 V, the unity-gain bandwidth of an FET will be
A
626 MHz
B
646 MHz
C
663 MHz
D
683 MHz
4
2021 · Unclassified
2021 Electronics and Telecommunication Engineering
The voltage gain of CE amplifier circuit can be approximated for an ideal input ac source and is given by (a) A_vs = r'_e / (R_C × R_L) (b) A_vs = - r'_e / (R_C || R_L) (c) A_vs = - (R_C || R_L) / r'_e (d) A_vs = (R_C × R_L) / r'_e where : R_L = Load resistance R_C = Collector resistance r'_e = Effective resistance at input of transistor from emitter resistance R_E
A
A_vs = r'_e / (R_C × R_L)
B
A_vs = - r'_e / (R_C || R_L)
C
A_vs = - (R_C || R_L) / r'_e
D
A_vs = (R_C × R_L) / r'_e
5
2021 · Unclassified
2021 Electronics and Telecommunication Engineering
The advantage of using a Class-B push-pull transistor amplifier over a Class-A push-pull transistor amplifier is
A
A negligible power loss at no input signal
B
Harmonic distortion is lower
C
Self-bias can be used
D
Supply voltages have good regulation
6
2021 · Unclassified
2021 Electronics and Telecommunication Engineering
The overall decibel (dB) voltage gain of a multistage amplifier is
A
The dB voltage gain of the first stage
B
The product of the dB voltage gains of the individual stages
C
The sum of the dB voltage gains of the individual stages
D
The dB voltage gain of the last stage