| Post Name | INSTRUCTOR GR I -ELECTRONICS |
|---|---|
| Department | ENGINEERING COLLEGES - TECHNICAL EDUCATION |
| Question Paper Code | 155/2014 |
| Date of Test | 25 September 2009 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Ina zener diode :
Answer
D. both P and N regions are heavily doped
2
Which of the following transistor configuration offers highest input impedance ?
Answer
C. y Ec
3
A half wave rectified sinusoidal waveform has a peak voltage of 10 V. Its average value of the fundamental component is:
Answer
B. 10/π V
4
Barkhaussen criteria for oscillation is applicable to :
Answer
A. _ sinusoidal oscillators
5
Which among the following is not an advantage of FET over BJT ?
Answer
Question Cancelled
6
RC coupled amplifier is used as
Answer
D. voltage amplifier
7
Ifa specific application of an amplifier demands better immunity to noise also which of the
following amplifier can be chosen ?
Answer
B. Differential amplifier
8
The phase shift introduced by the wien bridge in a wien bridge oscillator at the frequency of
oscillation is =
Answer
Question Cancelled
9
Which among the following will not affect the de performance of the op-amp ?
Answer
C. slew rate
10
Communication systems that do not use modulation are called :
Answer
B. base band communications
11
Which among the following can be taken as a constant envelope modulation ?
Answer
D. FM
12
Choose the correct statement, regarding the measurement of a sinusoidal voltage
waveform : ‘
Answer
D. using CRO the peak voltage and using multimeter the R.M.S. value can be measured.
13
A series RL circuit takes 160 watts of energy at 0.8 power factor lagging from 100 V, 50 Hz
supply. The value of R is :
|
Answer
C. 400
14
Magnitude of Electric Field Intensity in the depletion region of an open circuited
PN junction is ;
Answer
B. maximum at the junction
15
Drift current in the semiconductor depends upon :
Answer
Question Cancelled
16
A zener diode when used in voltage stabilization circuits is biased in :
Answer
B. reverse breakdown region
17
The PN junction in photodiode is :
Answer
D. reverse biased
18
Which MOSFET amplifier is best suited for high frequency applications ?
Answer
C. CG
19
A particular application requires dc level restoration of sinusoidal signals _. circuit
| can be used for de restoration.
Answer
A. clamping
20
The input resistance of a CE amplifier can be increased by :
Answer
C. including an unbypassed resistance in the emitter lead
21
Some properties of negative feedback are listed. Choose the property which is not applicable |
to negative feedback :
Answer
A. Gain enhancement
22
Op-amp integrator can be used as ____ filter.
Answer
C. LPF
23
circuit can be used as a sine wave to square wave converter. (of same frequency)
Answer
A. Schmitt trigger
24
A non-inverting amplifier with a gain of 10 is to be designed. If Ry and R, are the resistors
used, the possible values of Reand Rj are ______, respectively,
Answer
D. 9kQ,1kD
25
One input of a 2 input EXOR gate is connected to logic 1 and to the other input ‘A’ is given.
The output of EXOR is :
Answer
B. A
26
A logical expression in 3 variables is to be implemented using a multiplexer, i.e. y = f(A, B, C). The multiplexer chosen is:
Answer
A. 8 : 1 Multiplexer
27
An energy signal is one which has :
Answer
D. finite energy and zero average power
28
A system is said to be stable if :
|
Answer
A. every bounded input results in a bounded output
29
The output of LTI system is equal to the :
Answer
D. convolution of impulse response and input sequence
30
What is the condition for existence of Fourier transform of a signal x(t) ?
Answer
A. If signal x(t) is absolutely integrable
31
The trigonometric Fourier series of an even function does not have the :
Answer
B. sine term
32
A finite-duration two-sided sequence's ROC:
Answer
A. Entire z-plane except z = 0 and z = ∞
33
About the realization of LT] systems, which among the following statement is most
appropriate :
Answer
C. both
34
For efficient computation of 16 point DFT :
Answer
D. radix 4 FFT algorithm is used
35
When the phase characteristic of a filter is linear within its pass band, the group delay of the
filter will be :
Answer
B. constant
36
An analog signal is band limited to 4 kHz, sampled at Nyquist rate and the samples are quantised into 4 levels. The quantised levels are assumed to be independent and equiprobable. If we transmit two quantized samples per second, the information rate is ______ bits/second.
Answer
C. 4
37
A transmission line of characteristic impedance 50 Ω is terminated by a 50 Ω load. When excited by a sinusoidal voltage source at 10 GHz, the phase difference between two points spaced 2 mm apart is π/4 radians. The phase velocity of the wave along the line is:
Answer
D. 1.6 × 10⁸ m/s
38
The intrinsic impedance of free space is :
Answer
B. 3772
39
During night which layer does not exist :
Answer
A. D layer
40
Radiation resistance of \/2 dipole is :
Answer
C. 730
41
The dominant wave of rectangular waveguide is :
Answer
B. TE
42
When an EM wave is incident normally on the surface.of a perfect dielectric, it is :
Answer
D. partially transmitted and partially reflected
43
A uniform plane electromagnetic wave propagating in x-direction have :
Answer
C. Components of E and H only in direction perpendicular to x-direction
44
VSWR of a line terminated in an open circuit is:
Answer
A. infinity
45
For BIBO stability of a system which of the following statement is correct ?
Answer
B. all roots must be in the LHS plane
46
The number of poles in the left half plane, right half plane and on the jw axis can be found
out from ;
Answer
D. Routh Hurwitz criterion
47
For frequency domain analysis of systems, the methods available are :
Answer
C. Both
48
Signal Flow Graph applies :
Answer
B. only to linear systems
49
Preemphasis and deemphasis is associated with :
Answer
D. FM broadcasting
155/2014 8 A
50
can be used for the demodulation of PM.
Answer
A. FM demodulator followed by an integrator
51
The error due to insufficient sampling rate is called :
Answer
A. aliasing
52
A signal m(t) band limited to 3 kHz is sampled at a rate 33 5% higher than Nyquist rate. |
What is the actual sampling rate ?
Answer
B. 8000 Hz
53
The number of message points in the signal space diagram of BFSK is
Answer
D. 2
54
The primary objective of spectrally efficient modulation is to :
Answer
C. maximize the bandwidth efficiency
55
Average information content per source symbol of a discrete memoryless source is termed
as:
Answer
B. entropy
56
The power spectral density of a stationary process is always :
Answer
D. non negative
57
For the same bit energy to noise density ratio the bit error rate of :
Answer
B. Coherent BPSK is less
58
A continuous time signal can be converted to discrete time signal by :
Answer
A. sampling and quantising
59
The impulse response of a linear time invariant filter matched to an input signalis___ =.
|
Answer
C. time reversed and delayed version of input
60
If the input to a stable linear time invariant filter is stationary process then the output of the
Alter ig Ss
|
Answer
D. stationary |
61
A stack is:
Answer
C. aset of memory locations in R/W memory reserved for storing information temporarly
during the execution of a program |
62
The OUT instruction :
Answer
B. sends the data from accumulator to output port
63
Consider an inverting amplifier configuration using an op-amp with slew rate 1 V/µs. The resistors are Rf = Ri = 10 kΩ. What is the shortest interval of time in which the input pulse can rise to 5 V without exceeding the amplifier's slew rate?
Answer
D. 5 µs
64
A CMOS inverter can be formed from the proper connection of NMOS transistor Q₁ and PMOS transistor Q₂. The connection will be (power-supply connection properly given):
Answer
C. Q₂ and Q₁ in series, drain of Q₂ to drain of Q₁, input to gate of both, output from drain; supply to source of Q₂
65
Wire ANDing is possible with :
Answer
D. Open collector output
155/2014 10 A
66
One among the following is not an application of flip flops. Which is that ?
Answer
C. frequency conversion
67
For ann type semiconductor Fermi level lies :
Answer
A. just below the conduction band
68
An optical fiber conducts light but can’t guide a radio frequency signal because :
|
Answer
B. Optical fiber supports EM radiation if and only if the radiation wavelength is much
smaller than fiber’s core diameter
69
Companding is used to :
Answer
A. overcome degradation in S/N ratio
70
Double spotting in radio receivers is due to :
Answer
D. poor selectivity of RF and IF sections
71
For a Hertzian dipole antenna the half power beamwidth in the E plane is :
Answer
C. 90°
72
The dynamic range of an 8 bit ADC is :
Answer
B. 48.2 dB
73
Depth of anesthesia can be determined using :
Answer
A. EEG
74
sis an example of non weighted code.
Answer
B. Gray code
75
Asynchronous counters are preferred in some applications due to the fact that :
Answer
C. _ they are easy to design
76
Which among the following can be used as a voltage variable resistor ?
Answer
A. FET
77
The Norton equivalent circuit and the Thevenin equivalent circuit of a given circuit are drawn. If ZTH is the internal impedance of the Thevenin circuit and ZN is the internal impedance of the current source in the Norton circuit:
Answer
B. ZN = ZTH
78
A 3 input NAND gate is available as a circuit element. The method in which it can be
| converted to an inverter is
Answer
D. both
79
Choose the correct statement regarding Superposition Theorem :
Answer
C. Superposition Theorem can be applied to linear circuits only
80
The filter which is preferred to use with rectifiers for load currents in excess of 50 mA is :
Answer
A. LC filter
81
Gomati is the tributory of :
Answer
B. Ganga
82
Nathula Pass is located in which state :
Answer
C. Sikkim
83
Lowest Scheduled Tribe population is found in which state :
Answer
A. Goa
84
Seasonal unemployment refers to :
Answer
D. Agriculture
85
is a part of Larid Development Bank.
Answer
B. Cooperative Credit Structure
86
Abhinav Bharat Society was founded by whom :
Answer
B. V.D. Savarkar
87
Thebaga movement related with which place : |
Answer
D. Bengal
88
Commonweal was edited by :
Answer
B. Annie Besant
89
In our constitution which article is related to the Election Commission :
Answer
B. 324
90
Who is the Chairman of Finance Commission at present in India ?
Answer
A. Y. Venugopal Reddy
91
Who is the Author of the work “Train to Pakistan” ?
Answer
B. Kushwant Singh
92
The art form in Kerala known as poor man’s kathakali :
Answer
D. Ottam Thullal
93
How many districts are there in the newly formed Telangana State ?
Answer
B. 10
94
Which colour in the Olympic rings indicate Asian Continent ?
Answer
C. Yellow
95
Highest town in Kerala is :
Answer
A. Munnar
96
The largest underground water electric power station in Kerala ;
Answer
C. Moolamattom
97
Who was the editor of ‘Mitavadi’ ?
Answer
D. C. Krishnan
98
The year of Guruvayoor Satyagraha :
Answer
A. 1931
99
According to Gandhiji __ is a “miracle of modern times”.
Answer
C. Temple entry proclamation of 1936
100
Chattampi Swamikal attained Samadhi at Panmana in the year : |
Answer
D. 1924
-o00-
155/2014 14 A
Discussion
Ask a doubt or share a tip.
No comments yet — start the discussion.