NIELIT Technical Assistant_2016_march

Question 1
The thermionic emission current is given by
A
maxwell’s equation
B
Fermi-Dirac distribution
C
Langmuir child law
D
Richardson Dushman equation
Data-CommunicationRichardson-Dushman-equation
Question 2
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
Data-CommunicationZener-breakdown
Question 3
Negative feedback in an amplifier
A
increase noise
B
reduce bandwidth
C
reduce gain
D
increase distortion
Data-Communicationamplifier
Question 4
The gain of a bipolar transistor drops at high frequencies because of
A
early effect
B
parasitic inductive elements
C
high current in base
D
transistor capacitance
Data-CommunicationBipolar-Transistor
Question 5
The main application of enhancement mode MOSFET is in
A
oscillator circuits
B
amplifier circuits
C
clipper circuit
D
switching circuits
Data-CommunicationMOSFET
Question 6
Transducer 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
Data-CommunicationTransducer
Question 7
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
16 k ohm
ElectronicsData-Communication
Question 8
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
Data-CommunicationN-channel/p-channel-FETs
Question 9
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
2 k ohm
Data-CommunicationA/D-Converter
Question 10
In a digital circuit, the clock is a
A
Flip-clop
B
Inverter
C
Monostable multivibrator
D
Free running multivibrator
Data-CommunicationMultivibrator
Question 11
In which of the following codes the successive numbers differ in only one bit position ?
A
ASCII
B
Gray Code
C
Excess-3 Code
D
BCD
Digital-Logic-DesignNumber-Systems
Question 12
An instruction used to set the carry flag in a computer can be classified as
A
data transfer
B
arithmetic
C
logical
D
program control
Computer-OrganizationFlags
Question 13
In FM modulation pre-emphasis is done for
A
low frequency components
B
high frequency components
C
middle frequency components
D
all frequency components
Data-CommunicationFM-Signal
Question 14
When modulation index of AM wave is increased from 0.5 to 1, the transmitted power
A
increases by 25%
B
increases by 33.3%
C
increases by 50%
D
remains same
Data-CommunicationWaveform
Question 15
The electric flux and field intensity inside a conducting sphere is
A
Minimum
B
Maximum
C
Uniform
D
Zero
ElectronicsData-Communication
Question 16
A waveguide behaves as
A
high pass filter
B
low pass filter
C
band pass filter
D
all pass filter
Data-CommunicationWaveform
Question 17
In a lossless RLC circuit the transient current is
A
sinusoidal
B
square wave
C
triangular wave
D
non-oscillating
Data-CommunicationWaveform
Question 18
In an ac circuit, the maximum and minimum values of power factor can be
A
10 and 1
B
1 and -1
C
1 and 0
D
Any positive value
Data-CommunicationA/D-Converter
Question 19
In a circuit containing a complex impedance, maximum power transfer takes place when load is
A
pure resistance
B
equal to complex impedance
C
conjugate complex of the circuit impedance
D
inductive
Digital-Logic-DesignComplex-Impedance
Question 20
The effect of doping intrinsic semiconductor is to
A
Move the Fermi level away from the centre of forbidden band
B
Move the Fermi level towards the centre of forbidden band
C
Change the crystal structure of the semiconductor
D
To keep the Fermi level at the middle of the forbidden band
ElectronicsData-Communication
Question 21
Field Effect Transistor has
A
Large input impedance
B
Large output impedance
C
Large power gain
D
Small voltage gain
Digital-Logic-DesignLogic-Families
There are 21 questions to complete.

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