| Post Name | LECTURER IN ELECTRONICS ENGINEERING- NCA |
|---|---|
| Department | TECHNICAL EDUCATION |
| Question Paper Code | 052/2017/OL |
| Category Code | 318/2015 |
| Date of Test | 4 July 2017 |
| Medium of Question | ENGLISH |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Name the person who was greatly influenced by the radical reformist journal of Cairo, the Al-Manar
Answer
D. Vakkom Moulavi
2
Which among the following organization was founded in 1914 ?
Answer
B. Nair Service Society
3
Which one of the following is not written by Ponkunnam Varkey ?
Answer
D. Kudumbini
4
Name the first editor of Swadeshabhimani
Answer
D. C. P. Govinda Pillai
5
Vagbhadanandha was the main disciple of
Answer
C. Brahmananda Sivayogi
6
Monetary Museum of Reserve Bank of India is situated at
Answer
B. Mumbai
7
Recently Thousand history buffs gathered in Czech Republic to re-enact the Battle of Austerlitz. Name the ruler related with this Battle.
Answer
A. Napoleon
8
India made the Howitzer Artillery gun deal with
Answer
B. USA
9
Central Road Research Institute was established in
Answer
A. 1952
10
Who directed the Hindi filim 'Ae Dil Hai Mushkil'
Answer
C. Karan Johar
11
The minority carrier current in a semiconductor diode is largely a function of
Answer
B. Temperature
12
When the transistor is in high saturation, the biasing condition of base emitter BE and collector base CB junction is
Answer
C. BE forward biased, CE forward biased
13
Memory that losses its contents when power is lost is
Answer
B. Volatile
14
In a bridge rectifier, if Vₘ is the peak value of the applied voltage, the maximum reverse voltage across a diode is:
Answer
D. Vₘ
15
The main advantage of CMOS is its
Answer
A. Low power consumption
16
The space-charge region contains charges that are
Answer
C. Fixed donor and acceptor ions
17
The microwave tube that uses buncher and catcher cavities is
Answer
B. Klystron
18
Which of the following has same probability of error ?
Answer
D. BPSK and PAM
19
The negative resistance of the tunnel diode occurs when the bias voltage is
Answer
A. Between the peak and valley voltages
20
In an RC differentiator, the condition for differentiation is
Answer
B. RC << 0.16T
21
For an input pulse train of clock period T, the delay produced by an n stage shift register is
Answer
C. (n + 1)T
22
An n-channel JFET has Iᴅss = 1 mA and Vₚ = −5 V. Its maximum transconductance is:
Answer
A. 0.4 millimho
23
For thyristors, pulse triggering is preferred to dc triggering because
Answer
D. All of these
24
If an amplifier with a gain of −1000 and feedback of β=−0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be
Answer
A. 0.2%
25
The sensitivity of a multimeter is given in
Answer
B. KΩ/V
26
A superheterodyne radio receiver with an intermediate frequency of 455 KHz is tunded to a station operating at 1200 KHz. The associated image frequency is
Answer
C. 2110 KHz
27
The multivibrator circuit configuration that can be used to convert a sinusoidal input into a square wave output is
Answer
D. Schmitt trigger
28
A Yagi antenna in a horizontal plane produces
Answer
B. An endfire pattern
29
A problem with class B push pull amplifier is that they usually suffer from
Answer
C. Cross-over distortion
30
A 12 bit binary number has an accuracy equivalent to the decimal fraction
Answer
D. 1/4096
31
If a pulse train with a frequency of 10 KHz is applied to the trigger input of a bistable multivibrator, the frequency of the output pulse train would be
Answer
A. 5KHz
32
Six independent low pass signals of bandwith 3 W, W, W, 2W, 3W and 2W Hz are to be time division multiplexed on a common channel using PAM. To achieve this, the minimum transmission bandwidth of the channel should be __________ Hz.
Answer
A. 12W
33
Class a amplifiers are characterised by
Answer
D. Minimum efficiency and minimum distortion
34
From cricuit design simplicity and economy point of view, one of the following configurations for a converter is the best. Which is that ?
Answer
B. Ringing choke converter
35
An operational amplifier has an open-loop gain of 10⁵ and a cutoff frequency of 10 Hz. If negative feedback is applied to give a closed-loop gain of 100, the new cutoff frequency is:
Answer
C. 10 kHz
36
An amplifier power level is changed from 8 Watts to 16 Watts, equivalent dB gains is
Answer
C. 6 dB
37
Which of the following statements are correct for the basic transistor amplifier configurations
Answer
A. CB amplifier has low input impedance and a low current gain
38
Two antennas with apertures D₁ and D₂ are separated by a distance. The minimum distance required for far-field conditions is:
Answer
B. (D₁² + D₂²)/λ
39
Compared to the junction transistor, FET 1) Has a larger gain banwidth product 2) Is less noisy 3) Has less input resistance 4) Has only the majority carrier flow The correct statements are
Answer
D. 2, 4
40
How does 80386 change operation from real mode to protected mode ?
Answer
B. By setting MSB of CR0 contents
41
A source follower (using a FET) usually has a voltage gain which is
Answer
A. Slightly less than unity, but positive
42
Which logic family consumes the least power?
Answer
D. CMOS
43
In a 100% amplitude modulated signal, the power in the lower sideband is : Assume carrier power to be 100 watts and modulation system to be SSBSC.
Answer
C. 25 watts
44
A combinational logic circuit which is used to sen data coming from a source to two or more seperate destinations is called as
Answer
A. Demultiplexer
45
A JFET has a pinch-off voltage of 5 V. Its cutoff voltage is:
Answer
D. 5.0 V
46
For the full-wave rectifier shown, the mean current and RMS current respectively are:
Answer
C. 0.1√2/π, 0.05
47
A 2732 EPROM has a capacity of 4096 × 8 bits. The number of address lines required is:
Answer
B. 12
48
A lamp is controlled from two positions A and B (eg : staircase circuit). The boolean expression for the above circuit is
Answer
B. AB̅ + A̅B
49
Most of the linear IC s are based on the two transistor differential amplifier because of its
Answer
A. High CMRR
50
A speech signal occupying the bandwidth of 300 Hz to 3 KHz is converted into PCM format for use in digital communication. If the sampling frequency is 8 KHz and each sample quantized into 256 levels, then the output bit rate will be
Answer
D. 64 Kb/s
51
A push pull inverter provides a
Answer
C. Square wave output
52
When an antenna is placed in a vertical plane it will produce ?
Answer
C. Horizontally polarised waves
53
The octal equivalent of decimal 324.781 is
Answer
D. 504.771
54
In a travelling wave tube, the phase velocity of the axial components of the field of the slow wave structure is kept
Answer
B. Equal to the velocity of the electrons
55
Address bus of 8086 contains
Answer
A. 20 lines
56
The propagation delay for ECL IC family is approximately
Answer
A. 2ns
57
The pre-emphasis circuit is used
Answer
C. Prior to modulation
58
A NAND circuit with positive logic will operate as
Answer
D. NOR with negative logic
59
The average on state current for an SCR is 20A for a conduction angle of 120°. The average on=state current for 60° conduction angle will be
Answer
B. Less than 20 A
60
A switched mode power supply operating at 20 KHz to 100 KHz range uses _______ as the main switching element.
Answer
A. MOSFET
61
The biggest disadvantage of CW Doppler radar is that
Answer
C. It does not give target range
62
The field frequency of HDTV is
Answer
B. 60
63
An NPN transistor has beta cutoff frequency fᵦ = 1 MHz and low-frequency current gain β₀ = 200. Its unity-gain frequency fₜ and alpha cutoff frequency fₐ respectively are:
Answer
D. 200 MHz, 201 MHz
64
An opamp has a slew rate of 5V/μS. The largest sine wave output voltage possible at frequency of 1 MHZ is
Answer
D. (5/2π)volts
65
The number of comparisons carried out in a 5 bit flash type A/D converter is
Answer
A. 31
66
A PLA can be used
Answer
B. To realise a combinational logic
67
Hamming codes are used for error detection and correction. If the minimum hamming distance is m, then the number of errors correctable is
Answer
C. Less than m/2
68
Given W = e⁻ⁱ⁽²π⁄ᴺ⁾ and N = 3, if F = Wᴺ, then F is:
Answer
B. 1
69
The code division multiple access technique is not used in satellite communication because of
Answer
A. Wastage of power
70
Which of the following is introduced in the frequency sampling realization of the FIR filter ?
Answer
C. Poles and zeros at equally spaced points on the unit circle
71
The number of LED display indicators in logic probes are
Answer
D. 2
72
In a linear IC voltage, series pass transistor always operates in _________ region.
Answer
A. Active
73
The data rate of QPSK is ________ of BPSK.
Answer
C. Twice
74
Asymmetrical astable multivibrartor has R = 100Ω and C =0.1mF. The periodic time T is equal to
Answer
D. 13.8 mS
75
Bootstrap sweep circuit generally employs
Answer
B. Emitter follower
76
If P = [[1, 0], [0, 1]] and Q = [[0, 1], [1, 0]], then PQ is:
Answer
D. A symmetric matrix
77
If P = [[2, 3], [5, 7]], then P⁻¹ is:
Answer
C. [[-7, 3], [5, -2]]
78
The first three terms in the expansion of (a + bx)ᵐ are 1, 6x and 16x² respectively (α > 0, m is a natural number). Then:
Answer
A. m = 9, b = 2/3
79
The value of cot 1° + cot 89° is:
Answer
C. 2/sin 2°
80
In ΔABC, find the value of det([[cos(A + B), -tan A, 0], [sin(A + B + C), sin B, cos C], [sin B, 0, -tan A]]):
Answer
B. 0
81
The x-intercept of the line passing through the point (1, 1) and perpendicular to the line x − 2y + 1 = 0 is:
Answer
C. 3/2
82
If f(x) = det([[sin x, x, x³], [cos x, 1, x²], [tan x, 1, x]]), then the value of lim(x→0) f(x)/x² is:
Answer
B. 0
83
If x = a(cos θ − log cot(θ/2)) and y = a sin θ, then dy/dx is:
Answer
A. tan θ
84
The integral of ((x + 1)eˣ)/cos²(xeˣ) with respect to x is:
Answer
D. tan(xeˣ) + C
85
The slope of the normal to a curve at any point (x, y) on it is −x/((x + 1)y). The equation of the curve is:
Answer
A. y = Cxeˣ
86
One coulomb is equal to the charge on __________ electrons.
Answer
B. 6.28 × 10¹⁸
87
The Ohm's laws deals with the relation between
Answer
D. Current and p.d.
88
One kWh is equal to __________ kcal.
Answer
A. 860
89
Resistivity is usually expressed in terms of:
Answer
C. ohm metre
90
Three equal resistors are connected in series across an emf source, dissipate 60 W of power. What is the power dissipated if the same resistors are connected in parallel ?
Answer
B. 60
91
The main constituents of a Portland Cement is
Answer
A. lime
92
The most commonly used bond for all wall thickness is
Answer
B. English bond
93
A line normal to the plumb line at all points is known as
Answer
C. Level line
94
In a well-conditioned triangle, no angle should be less than
Answer
A. 30°
95
A fixed point of reference of known elevation is called
Answer
C. Bench mark
96
The part which controls the air fuel ratio in a petrol engine is
Answer
B. Carburettor
97
In IC Engines the process of removing burnt gases from combustion chamber of cylinder is known as
Answer
C. Scavenging
98
The compression ratio of Diesel engine varies from
Answer
A. 15 to 25
99
The purpose of moderator in a nuclear power plant is
Answer
D. To reduce the speed of fast moving neutrons
100
The differential is located between propeller shaft and the
Answer
C. Rear axle
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