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Exam Details

ISROElectronics & Communication Engineering 2018

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Questions 80
Duration 180 mins
Package ESE & GATE EC - Previous Year Papers

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Difficulty distribution

Medium 58 72.5%
Hard 22 27.5%

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Multiple Choices 80 100%

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Sample questions from this paper

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1
2018 · Unclassified
ISROElectronics & Communication Engineering 2018
The circuit shown in the figure below is a: (where A1 & A2 are ideal op-amps)
A
Logarithmic Multiplier
B
Logarithmic Amplifier
C
Antilog Amplifier
D
None of the above
2
2018 · Unclassified
ISROElectronics & Communication Engineering 2018
Determine the change in collector. due to change in base emitter voltage VBE from 250 C to 1000 C for a Silicon Transistor in Fixed Bias Configuration having =100. (Consider follwing variatio in Silicon transistor parameters with temperature- At T=250C, VBE = 0.65 V and At T = 1000C. VBE = 0.5 V)
A
B
C
D
3
2018 · Unclassified
ISROElectronics & Communication Engineering 2018
An antenna is fed with 200 W power. The efficiency of the antenna is 75%. If the radiation pattern of the antenna is pattern of the antenna is for (azimuth angle) and (elevation angle). =0 elsewhere Find the radiation intensity in the direction of maximum radiation
A
225 W/sterdian
B
200 W/steradian
C
250 W/steradian
D
150 W/steradian
4
2018 · Unclassified
ISROElectronics & Communication Engineering 2018
A reflex klystron is oscillating at 10GHZ when operated in mode, find the transit time of the electron in repeller space in nano seconds (ns).
A
0.25
B
0.275
C
0.55
D
0.036
5
2018 · Unclassified
ISROElectronics & Communication Engineering 2018
Identify A and B current limiting techniques in a.c to d.c power supplies respectively, in the grapgh below.
A
Current limiting Mode, Constant Current Mode
B
Re-entrant limiting Mode, Current limiting Mode
C
Fold back limiting Mode, Re-entrant limiting Mode
D
Current limiting Mode, Fold back limiting Mode
6
2018 · Unclassified
ISROElectronics & Communication Engineering 2018
A Gold cavity resonator at 10 GHz is fully coated using m YBCO (Yttrium Barium Copper Oxide) material and operating at boiling temperature of liquid nitrogen. What is the Skin Depth of RF at this frequency? Assume = 4X107 Siemens/meter at cavity operating temperature.
A
m
B
m
C
m
D
None of the above