| Post Name | TECHNICIAN GRADE II (ELECTRONICS) |
|---|---|
| Department | KERALA CO OPERATIVE MILK MARKETING FEDERATION |
| Question Paper Code | 096/2014 |
| Date of Test | 8 July 2014 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Removing bypass capacitor across the emitter-leg resistor in a CE amplifier causes : |
Answer
D. Decrease in voltage gain
2
The breakdown mechanism in a lightly doped p-n junction under reverse biased condition is
called : |
Answer
A. Avalanche breakdown
3
BIOS means: | |
Answer
B. B) Basic input/output system |
4
A network configuration in which each computer is attached to a central unit is called a
——————. network.
Answer
A. Star
5
Inan intrinsic semiconductor, the Fermi-level is :
Answer
B. Midway between conduction and valence band |
6
Data is transmitted using light through a ——-—————— cable.
Answer
B. Fiber-optic
7
An oscillator of the LC type that has a split capacitor in the circuit is : |
|
Answer
B. ° Colpitts oscillator
|
8
After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the
saturated magnetic fluxis called: ey
Answer
B. Retentivity
9
The shape of warning sign is:
Answer
A. Triangular
10
Ifa voltmeter marked in volts ‘is used to measure a 3500 milli volt potential, what reading
would it shaw?
Answer
A. 3.5 volts
11
In aseries resonant circuit at resonance, the circuit has : :
|
Answer
C. low impedance
12
HDTV stands as:
Answer
A. High Definition Television
13
A circuit designed to increase the level of its input signal is called :
Answer
D. An amplifier
14
Ina Yagi-Uda 3 element directional antenna, the —-———————_ is the longest radiating |
| element. .
|
Answer
C. Reflector
15
The connecting leads in an IC chip are made of : !
Answer
A. Aluminium’
16
Atype of memory chip whose contents can be quickly changed by the computer at any time is
called :
Answer
D. RAM
96/2014 | 4 A
17
The NAND gate output will be low if the two inputs are :
Answer
D. 11
18
A flip-flop has two outpute which are : | |
Answer
C. Always complementary
19
Primary source of power for satellite is * }
Answer
C. solar cells ~
20
Which of the following is the fastest logic?
Answer
B. ECL j
21
How many flip flops are required to construct a decade counter? |
Answer
C. 4
22
A universal logic gate is one, which can be used to generate any logic function. Which of the
following is a universal logic gate?
Answer
D. NAND |
23
A full adder logic circuit will have :
Answer
D. Three inputs and two outputs |
24
The 2’s complement of the number 1101110 is:
Answer
C. 0010010
25
The Schmitt trigger circuit behaves as
Answer
A. Triangular wave generator
26
Satellite communication works through : :
Answer
C. Receptor
27
The fourth color band on a resistor mean : | iS -
Answer
B. The power rating in watts oS
28
MPEG stands as: ;
Answer
D. None of these
29
d0. Inour TV system, which system is being followed? |
Answer
A. PAL
30
What is a coaxial cable?
Answer
A. Two wires side-by-side in a plastic ribbon
31
Wien bridge oscillator can typically generate frequencies in the range of :
Answer
D. 100 MHz— 150 MHz |
32
Ina full-wave rectifier without filter, the ripple factor is :
Answer
A. 1.21
33
The arrangement of the computers in a network is called the ; :
Answer
B. Topology
34
Which of the following diodes has a negative-resistance region?
Answer
B. Varactor at |
35
N-type silicon is obtained by :
Answer
D. Doping with a mixture of trivalent and tetravalent
36
Answer
C. enhancement
37
What is the phase difference between input and output signal in a CE amplifier?
Answer
D. 90° |
38
The voltage gain of CC amplifier is 7 |
Answer
C. c) Equal to |
39
Which of the following statements is true?
Answer
Question Cancelled
40
Which of the following amplifiers is known as an emitter follower?
Answer
D. Cascade amplifier
41
Power is defined as:
Answer
B. The rate at which energy is radiated or dissipated
42
‘Three equal resistance of magnitude 5 Ohm each are connected in delta, The resistance
between any two pair of terminals of the delta will be :
Answer
Question Cancelled
43
The other name for beta of BJT is:
Answer
C. Power amplification factor
44
One coulomb-per second is equal to one:
Answer
A. Watt
45
‘The reverse - saturation current of a silicon diode :
Answer
D. Increases by 1.5 times for every 2°C increment in temperature.
46
Inclass—A amplifier, the output current flows for :
Answer
A. A part of the cycle or the input signal |
47
For silicon the forbidden gap is :
Answer
B. 0.25 ev
48
The modulation used in cellular communication is -
Answer
A. Amplitude modulation
49
Manganin is an alloy of: 3
Answer
Question Cancelled
50
In Quadrature Amplitude Modulation, (QAM), the carrier is modulated by :
Answer
A. . Amplitude
51
What are the steps followed to achieve Pulse Code Modulation?
Answer
D. Coding, modulating, packetizing
52
An ideal power supply is characterized by :
Answer
C. Zero internal resistance
53
What is the “power factor’?
Answer
C. Sin of the phase difference between EF and I |
54
‘B55. A house served by a 220 V supply light, is protected by a 9-Ampere fuse. The maximum
number of 60W bulbs in parallel that can be turned on is :
Answer
A. ll
55
Holes are the minority carriers in which type of semiconductor?
Answer
B. Intrinsic |
56
Doubling the number of turns of wire in an inductor :
Answer
C. Reduces the value of inductance by one-fourth |
57
Which bus is bidirectional? ;
Answer
D. Multiplexed bus
58
Ifthe input to a comparator is a sine wave, the output isa:
Answer
A. Ramp voltage '
59
Convert the binary number 1011010 to hexadecimal : |
Answer
B. 5F
60
Ahalf-eyele average voltage of 12 V is equal to what rms voltage?
Answer
A. 13.33 V
61
ASCII stands for :
Answer
Question Cancelled
62
How is power dissipated in a resistor?
Answer
C. By current
63
You can determine the direction of the lines of force surrounding a conductor by using :
Answer
B. The right-hand rule
64
Moving iron meter is suitable for measurement of : ;
|
Answer
B. DC ,
65
The effective value of a sine wave is equal to :
Answer
C. Sin 45° of peak voltage 3
66
How is ac current related to ac voltage in a purely capacitive circuit?
;
Answer
Question Cancelled
67
A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates? -, |
Answer
D. AND or NOR gates |
68
AJFET: | |
Answer
C. Is a ecurrent-controlled device
69
A JFET:
Answer
A. Is a voltage-controlled device
70
When does maximum power transfer happen from the source to the load?
Answer
D. When the source resistance equals the load resistance
71
To connect a computer with a device in the same room, you might be likely to use:
Answer
A. A coaxial cable
72
Frames from one LAN can be transmitted to another LAN via the device:
Answer
B. Bridge
73
The geostationary satellite used for communication systems:
Answer
D. All of the above
74
High frequency transformers sometimes make use of ferrite cores because it has:
Answer
Question Cancelled
75
An emitter follower has:
Answer
B. High input impedance and low output impedance
76
To prepare a P type semiconducting material the impurities to be added to silicon are:
Answer
D. Boron, Gallium
77
The device used for locating open circuits or short circuits in a circuit is:
Answer
C. Ohm meter
78
To increase the input resistance and decrease the output resistance in negative feedback, the type used is:
Answer
C. Voltage Series
79
A register in the microprocessor that keeps track of the answer or results of any arithmetic or logic operation is the:
Answer
B. Accumulator
80
The waveform used in X-direction in CRO for deflecting the electron beam from left or right is:
Answer
D. Saw tooth
81
The machine which transmits documents/maps/photographs over telephone line:
Answer
A. Fax
82
Tesla is a unit of:
Answer
C. Flux density
83
The equivalent of 1 micro ampere is:
Answer
C. One millionth of an ampere
84
An affordable technology that uses existing telephone lines to provide high-speed connections is called:
Answer
B. DSL
85
At resonance, the term bandwidth includes all frequencies that allow what percentage of
maximum current to flow?
Answer
C. y 70.7
86
Which of the following is a passive component? | |
Answer
B. Capacitors
:
87
The process by which Impurities are added to a pure semi-conductor is : ;
Answer
A. Doping
88
An ideal operational amplifier has : |
Answer
C. Infinite bandwidth
89
A digital-to-analog converter is an application of the : |
Answer
A. Scaling adder
90
A portion of the output that provides circuit stabilization is considered to be :
|
Answer
B. Negative feedback
91
The ratio between differential gain and common-mode gain is called :
Answer
B. Common-mode rejection
92
The Schmitt trigger is used for :
Answer
D. Pulse shaping
93
What type of application would use an injection laser diode?
~
Answer
C. A fiber optic transmission line
94
Atransducer's function is to: | '
Answer
A. Convert energy
95
Which component is considered to be an “OFF” device?
Answer
D. E-MOSFET ©
96
Ina PLL, to obtain lock, the signal frequency must :
Answer
C. Come within the capture range —
j
97
The U and V colour difference signals have phase difference of :
Answer
B. 90° |
98
The sensitivity of oscilloscope is determined by :
Answer
C. Vertical amplifier
99
The frequency of colour subcarrier is:
Answer
Question Cancelled
100
The major difference between ground and virtual ground ia that virtual ground is only
Answer
A. Voltage reference )
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