NIC Technical Assistant Paper 2016
The thermionic emission current is given by
(a) maxwell’s equation
(b) Fermi-Dirac distribution
(c) Langmuir child law
(d) Richardson Dushman equation
Zener breakdown occurs
(a) due to rupture of covalent bonds
(b) due to thermally generated minority carriers
(c) in lightly doped junctions
(d) only in germanium diodes
Negative feedback in an amplifier
(a) increase noise
(b) reduce bandwidth
(c) reduce gain
(d) increase distortion
The gain of a bipolar transistor drops at high requeincies because of
(a) early effect
(b) parasitic inductive elements
(c) high current in base
(d) transistor capacitance
The main application of enhancement mode MOSFET is in
(a) oscillator circuits
(b) amplifier circuits
(c) clipper circuit
(d) switching circuits
Tranducer is a device which
(a) amplifies a given electrical signal
(b) transfer an electrical signal from one place to another
(c) translates a physical parameter into suitable electrical quantity
(d) changes the waveform of an electrical signal
The turn ratio of a transformer is 20:1. If a load of 40 ohm is connected across the secondary. What will be the effective resistance seen looking into the primary?
(a) 800 ohm
(b) 4 k ohm
(c) 8 k ohm
(d) 16k ohm
n-channel FETs are considered better than p-channel FETs because
(a) they consume less power
(b) they have high switching time
(c) mobility of electrons is greater than that of holes
(d) they consume less power
In a 4-bit weighted resistor D/A converter, resistor value corresponding to LSB is 16 k ohm. The resistor value corresponding to MSB is
(a) 32 k ohm
(b) 15 k ohm
(c) 64 k ohm
(d) 02 k ohm
In a digital circuit, the clock is a
(a) Flip-clop
(b) Inverter
(c) Monostable multivibrator
(d) Free running multivibrator
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