NIELIT Junior Teachnical Assistant_2016_march

Question 1
The addition of p-type impurity to intrinsic material creates allowable energy levels
A
slightly above conduction band
B
slightly below conduction band
C
slightly above valence band
D
slightly below valence band
ElectronicsData-Communication
Question 2
Measurement of Hall coefficient enables the determination of
A
temperature coefficient
B
recovery time of stored carrier
C
Fermi level
D
type of conductivity and concentration of charge carriers
ElectronicsData-Communication
Question 3
The diffusion current is proportional to
A
applied electric field
B
concentration gradient of charge carriers
C
square of electric field
D
cube of applied electric field
Data-CommunicationDiffusion-Current
Question 4
For generating 1 MHμ frequency signal, the most suitable circuit is
A
phase shift oscillator
B
weinbridge oscillator
C
colpilt’s oscillator
D
audio oscillator
Data-CommunicationColpitt’s-oscillator
Question 5
In a two stage CE amplifier circuit, the ac collector resistance of the first stage depends on
A
the input impedance of first stage
B
the input impedance of second stage
C
load resistance only
D
none of the above
Data-CommunicationA/D-Converter
Question 6
Class C amplifier is suitable for
A
a narrow frequency band
B
audio frequency
C
a wide frequency band
D
all the signals
Data-Communicationamplifier
Question 7
For input voltage of V​ m​ sin net, peak inverse voltage rating needed for diode in a half wave rectifier using capacitor filter is
A
V​ m
B
2V​ m
C
V m/√2
D
V m /π
E
None of Above
ElectronicsData-Communication
Question 8
For a BJT, α and β are related to
A
β =α/(1−α)
B
β =α/(1+α)
C
β =1/(1+α)
D
α=β/(1+β)
Data-CommunicationBJT
Question 9
Which of the following has lowest propagation delay ?
A
ECL
B
TTL
C
PMOS
D
CMOS
Digital-Logic-DesignLogic-Families
Question 10
The number of address lines in a memory chip of size 8 192 × 8 is
A
8
B
12
C
13
D
16
Computer-OrganizationMemory-Interfacing
Question 11
The minimum number of two input NAND gates required to implement the Boolean function μ = ABC is
A
2
B
3
C
5
D
6
Digital-Logic-DesignBoolean-Functions
Question 12
Which of the following input combination is not desirable for SR flip flop ?
A
S = 0, R = 0
B
S = 0, R = 1
C
S = 1, R = 0
D
S = 1, R = 1
Digital-Logic-DesignSequential-Circuits
Question 13
Power spectral density of white noise
A
is constant with frequency
B
increases with frequency
C
decreases with frequency
D
varies exponentially with frequency
Data-CommunicationPower-Spectral-Density
Question 14
The VHF frequency range is
A
30 to 300 KHμ
B
3 to 30 MHμ
C
30 to 300 MHμ
D
300 to 3000 MHμ
Data-CommunicationVHF
Question 15
Vestigial sideband is most commonly used in
A
radio
B
telephony
C
television transmission
D
all of the above
Data-CommunicationVestigial-sideband
Question 16
In a uniform plane wave E and H are related by
A
E / H = 1
B
E/H =√ ∈/μ
C
E / H = π
D
E / H = √ μ / ∈
Data-CommunicationWaveform
Question 17
A current signal is given by i (t) = 20e −50t . The initial and final value of current are
A
0 and 20
B
20 and 0
C
0 and 10
D
20 and 10
ElectronicsData-Communication
Question 18
The buffer amplifier should have
A
low output impedance and low input impedance
B
low output impedance and high input impedance
C
high output impedance and low input impedance
D
high output impedance and high input impedance
Data-Communicationamplifier
Question 19
Mesh analysis is applicable to only
A
non-planar network
B
planar network
C
circuits containing voltage sources
D
circuits containing current sources
Computer-NetworksTopologies
Question 20
When a reverse bias is applied to a P-n junction the width of the depletion layer:
A
Remains the same
B
Is increased
C
Is decreased
D
May increase or decrease
Data-Communicationp-n-junction
Question 21
Common emitter configuration is preferred when main criterion is
A
Voltage gain
B
Current gain
C
Both voltage gain and current gain
D
Input impedance
ElectronicsData-Communication
There are 21 questions to complete.

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