ISRO Satellite Centre Bengaluru Technical Assistant Electronics Paper 2017

ISC Technical Assistant Electronics Paper 2017
Exam Date – 20th Aug 2017
Total Number of Questions – 60 Nos. Time- 90 Minutes

How much resistance must be connected in parallel with a 360 Ohm resistor to obtain an equivalent resistance Req. of 120 Ohm?
(a) 180 Ohm
(b) 460 Ohm
(c) 1.8 k ohm
(d) 320 Ohms

what is the modulation index in a frequency modulated signal with a modulating frequency of 500 Hz and frequency deviation of 10 kHz?
(a) 10
(b) 20
(c) 25
(d) 50

Battery cells are connected in series to
(a) increase the current capacity
(b) increase the output voltage
(c) decrease the internal resistance
(d) decrease the output voltage

A differential amplifier has a differential gain Ad of 100 and common mode gain Ac of 0.1. What is its CMRR?
(a) 10 dB
(b) 20 dB
(c) 30 dB
(d) 60 dB

The value of alternating current or voltage that has the same heating effect as a corresponding dc value is known as
(a) peak value
(b) peak to peak value
(c) average value
(d) rms value

To double the resonant frequency of an LC circuit with a fixed value of L, the capacitance must be
(a) reduced by one quarter
(b) reduced by one-half
(c) doubled
(d) quadrupled

Notch filter is ____
(a) Band pass filter
(b) Low pass filter
(c) High pass filter
(d) Band stop filter

If the number of turns in a coil is doubled in the same length and area, the inductance L will
(a) double
(b) quadruple
(c) remains the same
(d) be cut in half

Silicon controlled Rectifier (SCR) is usually turned on by
(a) break over
(b) gate tigger
(c) breakdown
(d) holding current

Persistence of vision in a human eye is
(a) 1/16th of a minute
(b) 1/16th of a second
(c) 1/6th of a minute
(d) 1/6th of a second

Sphygmomanometer is used
(a) for checking blood sugar
(b) for checking blood pressure
(c) for checking heart beat
(d) for dialysis

A compared to a sillicon rectifier diode, an LED has a
(a) lower forward voltage and higher breakdown voltage
(b) lower forward voltage and lower breakdown voltage
(c) higher forward voltage and higher breakdown voltage
(d) higher forward voltage and lower breakdown voltage

Ultrasonic diagnostic imaging typically employs a frequency range from
(a) 1 kHz to 15 kHz
(b) 1 MHz to 15 MHz
(c) 1 Hz to 100 Hz
(d) 1 GHz to 15 GHz

The main advantage of CMOS is its
(a) High power rating
(b) Small signal operation
(c) Switching capability
(d) Low power consumption

Aspect ratio for HDTV is
(a) 3 : 2
(b) 4 : 3
(c) 2 : 1
(d) 16 : 9