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
       Electronics       Data-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
       Electronics       Data-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-Communication       Diffusion-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-Communication       Colpitt’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-Communication       A/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-Communication       amplifier
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
E
None of Above
       Electronics       Data-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-Communication       BJT
Question 9
Which of the following has lowest propagation delay ?
A
ECL
B
TTL
C
PMOS
D
CMOS
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-Organization       Memory-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-Design       Boolean-Function
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-Design       Sequential-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-Communication       Power-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-Communication       VHF
Question 15
Vestigial sideband is most commonly used in
A
radio
B
telephony
C
television transmission
D
all of the above
       Data-Communication       Vestigial-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-Communication       Waveform
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
       Electronics       Data-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-Communication       amplifier
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-Networks       Topologies
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-Communication       p-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
       Electronics       Data-Communication
Question 22
The potential divides method of biasing is employed in amplifiers in order to
A
Reduce the cost of the circuit
B
Reduce the dc base circuit
C
Limit the input ac signal going to the base
D
Make the operating point almost independent of β
       Data-Communication       amplifier
Question 23
The maximum efficiency of class B amplifier is
A
25%
B
50%
C
78.5%
D
88%
       Data-Communication       amplifier
Question 24
In frequency modulation
A
The frequency of the carrier remains constant
B
The amplitude of the carrier remains constant
C
The amplitude of the carrier wave is varied
D
The frequency of the carrier is made equal to the signal frequency
       Data-Communication       amplifier
Question 25
Two’s complement of a binary number 1010 is
A
0101
B
0101
C
0110
D
1001
       Digital-Logic-Design       Number-Systems
Question 26
The number of flip-flops required in a decade counter is
A
2
B
3
C
4
D
10
       Digital-Logic-Design       Sequential-Circuits
Question 27
An 8-bit digital to analog converter has a maximum output voltage of 2v. If input voltage is 1.5v, the digital output at the end of conversion will be
A
0001 1111
B
0110 0001
C
1111 1000
D
1100 0000
       Data-Communication       A/D-Converter
Question 28
Which of the following can be used for accurate and stable time base circuit in a digital frequency meter ?
A
Quartz
B
Carbon
C
Aluminium
D
Copper
       Electronics       Data-Communication
Question 29
An inductor
A
Allows a.c. to pass but blocks d.c.
B
Allows d.c. to pass but blocks a.c.
C
Allows a.c. and d.c. to pass
D
Blocks d.c. as well as a.c
       Data-Communication       A/D-Converter
Question 30
Two resistors R1 = 60KΩ and R2 = 12KΩ are connected in parallel. Their effective resistance is
A
5 K Ω
B
60 Ω KΩ
C
12 K Ω
D
10 K Ω
       Data-Communication       Resisters
Question 31
An electric machine will have high efficiency when
A
Input / output is low
B
Reactive power is more
C
KWh consumption is low
D
Losses are low
       Electronics       Data-Communication
Question 32
The demand factor for the electrical system is the ratio of
A
Max demand to connected load
B
Max demand to average load
C
Average power to max power
D
Reactive power to total power
       Data-Communication       Demand-Factors
Question 33
Which of the following theorems is a manifestation of the law of conservation of energy
A
Tellegen’s theorem
B
Reciprocity theorem
C
Thevenin’s theorem
D
Norton theorem
       Data-Communication       Tellegen’s-Theorem
Question 34
Voltage across capacitor in RLC series circuit is maximum
A
At resonance
B
Just before resonance
C
Just after resonance
D
Much after resonance
       Electronics       Data-Communication
Question 35
Which of the following is the most economical method of starting a single phase motor
A
Resistant start method
B
Inductance start method
C
Capacitance start method
D
Split phase method
       Electronics       Data-Communication
Question 36
Intel 8086 is a
A
8 bit
B
16 bit
C
32 bit
D
64 bit
       Computer-Organization       Microprocessor
Question 37
A 1 mA ammeter has a resistance of 100 ᘯ . It is to be converted to a 1 A ammeter. The value of shunt resistance is
A
0.001ᘯ
B
0.1001ᘯ
C
100000ᘯ
D
100ᘯ
       Electronics       Data-Communication
Question 38
When two resistance are connected in parallel, they have
A
Same resistances value
B
Same voltage across them
C
Same current passing through them
D
Different resistance value
       Electronics       Data-Communication
Question 39
In wave connected windings, the number of poles is
A
A=2
B
A=4
C
A=6
D
A=8
       Data-Communication       Waveform
Question 40
Power consumed by purely inductive circuit is
A
VI
B
VIcosx
C
VI sinx
D
Zero
       Electronics       Data-Communication
Question 41
If integer needs two by storage, then maximum value of an unsigned integer is
A
2 16 − 1
B
2 15 − 1
C
2 16
D
2 15
       Digital-Logic-Design       Number-Systems
Question 42
The data flow model of an application mainly shows
A
the underlying data and the relationships among them
B
processing requirements and the flow of data
C
decision and control information
D
communication network structure
Question 43
In airline reservation system, the entities are date, flight number, place of departure, destination, type of plane and seats available. The primary key is
A
flight number
B
flight number + place of departure
C
flight number + date
D
flight number + destination
       Database-Management-System       Functional-Dependency
Question 44
Determine the number of page faults when references to pages occur in the occur -1, 2, 4, 5, 2, 1, 2, 4. Assume that the main memory can accommodate 3 pages and the main memory already has the pages 1 and 2, with page 1 having been brought earlier than page 2. (Assume LRU algorithm is used)
A
3
B
5
C
4
D
none of the above
       Operating-Systems       Page-Replacement-algorithm
Question 45
The only state transition that is initiated by the user process itself is
A
block
B
dispatch
C
wakeup
D
none of the above
       Operating-Systems       Process-Scheduling
Question 46
The word ‘format’ in formal languages means
A
the symbols used have well-defined
B
they are unnecessary, in reality
C
only the form of the string of symbols is significant
D
none of the above
       Web-Technologies       HTML
Question 47
Pick the correct statements The logic of Pumping lemma is a good example of
A
the Pigeon-hole principle
B
the divide and conquer technique
C
recursion
D
iteration
       Theory-of-Computation       Pumping-Lemma
Question 48
Any string of terminals that can be generated by the following CFG
S ⟶ XY
X ⟶ aX | bX | a
Y ⟶ Ya | Yb |a
A
has at least one b
B
should end in an ‘a’
C
has no consecutive a’s or b’s
D
has at least two a’s
       Theory-of-Computation       Context-Free-Language
Question 49
The first operating system used in microprocessor is
A
Zenix
B
DOS
C
CP/M
D
Multics
       Computer-Organization       Microprocessor
Question 50
The sequence of events that happen during a typical fetch operation is
A
PC ⟶ Mar ⟶ Memory ⟶ MDR ⟶ IR
B
PC ⟶ Memory ⟶ MDR ⟶ IR
C
PC ⟶ Memory ⟶ IR
D
PC ⟶ MAR ⟶ Memory ⟶ IR
       Computer-Organization       Machine-Instructions
Question 51
The addressing mode used in an instruction of the form ADD X Y, is
A
absolute
B
immediate
C
indirect
D
index
       Computer-Organization       Addressing-Modes
Question 52
The ASCII code 56, represents the character
A
V
B
8
C
a
D
carriage return
       C-Programming       ASCII
Question 53
A high speed communication equipment typically would not be needed to
A
E-mail
B
transferring large volume of data
C
supporting communication between nodes in a LAN
D
all of the above
       Computer-Science-General-Aptitude       Computer-Science-Basics
Question 54
The _______ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.
A
Residual Error rate
B
Transfer failure probability
C
Connection release failure probability
D
Connection establishment failure probability
       Data-Communication       Residual-Error-rate
Question 55
The middle term in the expansion of ( x/3 + 9 y )10
A
1 890 x 5 y 5
B
6 1236 x 5 y 5
C
3 77810 x 5 y 5
D
6 2136 x 5 y 5
       Engineering-Mathematics       Combinatorics
Question 56
The second, third and fourth terms in the binomial expansion (x + a ) and 240, 720 and 1080 respectively. Then, x , a and n are :
A
x = 3 , a = 3 , n = 5
B
x = 2 , a = 3 , n = 4
C
x = 2 , a = 3 , n = 5
D
x = 3 , a = 2 , n = 5
       Engineering-Mathematics       Combinatorics
Question 57
If
then the value of x is
A
-2
B
2
C
6
D
-6
       Engineering-Mathematics       Linear-Algebra
Question 58
Given y = arctan(tanh x) dy/dx = ?
A
1/cosh 2x
B
1/sinh 2x
C
1/(1+tanh2 x)
D
None of the above
       Engineering-Mathematics       Calculus
Question 59
On the parabola y = x 2 find the point N least distant from the straight line y = 2 x − 4
A
N (2, 4 )
B
N (1, 1 )
C
N (1, 2 )
D
N (− 1 , 1 )
       Engineering-Mathematics       Co-ordinate-Geometry
Question 60
For the function f (x) = x 2 + x − 1 , there exists a value x = c in the interval [ − 1 , 1 ] where f′(c) = 0 , then c is equal to
A
(√5 − 1 )/2
B
(√5 + 1 )/2
C
( − √5 − 1 )/2
D
( − √5 + 1 )/2
       Engineering-Mathematics       Calculus
Question 61
Three lines 3 x + y − 2 = 0 , p x + 2 y − 3 = 0 and 2 x − y − 3 = 0 intersect at a point. Then, the value of p is
A
-7
B
2
C
5
D
-11
       Engineering-Mathematics       Co-ordinate-Geometry
Question 62
The equation of the plane through the point ( − 1 , 3 , 2 ) and perpendicular to each of the planes x + 2 y + 3 z = 5 and 3 x + 3 y + z = 0 is
A
7 x − 8 y + 3 z + 2 5 = 0
B
7 x + 8 y + 3 z + 2 5 = 0
C
7 x − 8 y + 3 z − 2 5 = 0
D
7 x − 8 y − 3 z − 2 5 = 0
       Engineering-Mathematics       Co-ordinate-Geometry
Question 63
∫(xex /(1+x)2) equals to
A
(xex /(1+x))
B
x/(1+x)
C
ex/(1+x)2
D
ex/(1+x)3
       Engineering-Mathematics       Calculus
Question 64
A
1
B
-1
C
0
D
       Engineering-Mathematics       Calculus
Question 65
A
2/3
B
-2/3
C
3/2
D
-3/2
E
None of the Above
       Engineering-Mathematics       Calculus
Question 66
tan π / 8 = ?
A
1 − √2
B
1 + √2
C
√2 − 1
D
(√2 −1) /2
       Engineering-Mathematics       Trigonometry
Question 67
tan −1 ( √3 ) − cot −1 (− √3 ) equals to
A
0
B
2√3
C
−π/2
D
π
       Engineering-Mathematics       Trigonometry
Question 68
The vector magnitude 9 and perpendicular to both the vectors and is
A
B
C
D
       Engineering-Mathematics       Vectors
Question 69
If a is a real number and n is a positive integer then
A
B
C
D
       Engineering-Mathematics       Linear-Algebra
Question 70
Solution of the differential equation x (dy/dx) + y = y 2 is given by
A
y − 1 = c xy
B
y = c xy − 1
C
x y = 1 + c x
D
y + 1 = c xy
       Engineering-Mathematics       Calculus
Question 71
For the curve y = x e x the point
A
x = − 1 is a minimum
B
x = 0 is a minimum
C
x = − 1 is a maximum
D
x = 0 is a maximum
       Engineering-Mathematics       Co-ordinate-Geometry
Question 72
Find the odd-man out:
A
spoon
B
tongs
C
chopsticks
D
fork
       Reasoning       Anology
Question 73
Find the odd-man out:
A
start
B
finish
C
over
D
complete
       Reasoning       Anology
Question 74
Find the odd-man out:
A
QNPO
B
YVXW
C
LHHJ
D
URTS
       Reasoning       Alphabetical-Series
Question 75
Find the odd-man out:
A
CEAF
B
HJFL
C
RTPU
D
LNJO
       Reasoning       Alphabetical-Series
Question 76
In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.
A
asibu
B
oarse
C
oinak
D
zamol
       Reasoning       Arrangement
Question 77
In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.
A
DAG
B
GJM
C
NKQ
D
VSY
       Reasoning       Alphabetical-Series
Question 78
In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.
A
ira
B
aam
C
kas
D
btd
       Reasoning       Alphabetical-Series
Question 79
In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.
A
yxz
B
cbd
C
nmo
D
pqo
       Reasoning       Alphabetical-Series
Question 80
In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.
A
AiiR
B
MooX
C
VxxZ
D
DecY
       Reasoning       Alphabetical-Series
Question 81
Select the related letter/word/number/figure from the given alternatives. BJNT : CIOS :: DHPV : ?
A
EGQU
B
EIQW
C
ELPV
D
EIOU
       Reasoning       Alphabetical-Series
Question 82
Select the related letter/word/number/figure from the given alternatives. KIJM : QOPS :: MKLO : ?
A
LMOR
B
OMNS
C
KMOQ
D
SQRU
       Reasoning       Alphabetical-Series
Question 83
If DELHI is coded as 73541 and CALCUTTA as 82589662, how can CALICUT be coded?
A
5279431
B
5978213
C
8251896
D
8543691
       Reasoning       Coding-Decoding
Question 84
If in a code language PRINCIPAL is written as MBOQSOMVW and TEACHER is written as FDVSZDB, how is CAPITAL written in that code?
A
SVMOFVW
B
SVMODVW
C
BVMODVW
D
SVMIDVW
       Reasoning       Coding-Decoding
There are 84 questions to complete.