Kerala PSC Tradesman Electronics Paper 2016

Kerala PSC Tradesman Electronics Paper 2016

The ripple factor of a halfwave rectifier is _________
(a) 0.482
(b) 0.812
(c) 40.6
(d) 1.21

Which of the following is the fastest switching component ?
(a) MOSFET
(b) JFET
(c) BJT
(d) pentode

The final power amplifier in a radio transmitter station is usually ________
(a) Class A
(b) Class B
(c) Class C
(d) Class AB

In AM radio receiver, the oscillator frequency is ___________
(a) incoming signal – 455 kHz
(b) incoming signal + 455 kHz
(c) equal to signal frequency
(d) equal to 455 kHz

The voltage gain of an emitter follower configuration can NOT be more than ________
(a) 1
(b) 0.5
(c) 10
(d) 100

The doping concentration in zener diode is __________
(a) very low
(b) very high
(c) zero
(d) infinity

Binary number system uses _________symbols
(a) 16
(b) 10
(c) 8
(d) 2

Trimmer is a variable _______
(a) resistor
(b) inductor
(c) capacitor
(d) None of these

The number of turns in secondary of a ____________ transformer is more than the primary
(a) step-down
(b) step-up
(c) 230 V to 6 V
(d) 11 kV to 230 V

In a PN junction diode the barrier potential offers opposition to __________
(a) Minority charge carriers in both regions
(b) Majority charge carriers in both regions
(c) Holes in N region
(d) Electrons in P region

Negative feedback in amplifier ___________ the stability of its voltage gain.
(a) increases
(b) decreases
(c) does not affect
(d) None of these

The time-base of a cRO is _________waveform
(a) sawtooth
(b) sine
(c) square
(d) recangular

Moving iron meter is usally used for measurement of ______
(a) AC and DC
(b) DC only
(c) AC only
(d) None of these

Integrator is a ______filter
(a) high pass
(b) low pass
(c) band pass
(d) band stop

OP-AMP may be used as
(a) summing amplifier
(b) voltage comparator
(c) differentiator
(d) all of the above