| Post Name | TRADESMAN - TV MAINTENANCE AND REPAIRS |
|---|---|
| Department | TECHNICAL EDUCATION - KANNUR |
| Question Paper Code | 024/2016 |
| Date of Test | 9 February 2016 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Unit of specific resistance is :
Answer
C. Ohm-meter
2
Find the resistance of a manganin wire with one third the length and one third the diameter
of a silver wire of resistance 19. The specific resistance of manganin is 30 times that of
silver :
Answer
A. 902
3
When resistors of different values are connected in parallel] -——————— across each resistor
is the same.
Answer
B. Potential drop
4
Which among the following is a linear component? )
Answer
D. Resistor
5
Ashort circuited path has practically ——————— resistance.
Answer
D. zero
6
When two 162 resistors are connected in parallel to a 24V battery, find the current flowing
in the circuit?
Answer
B. 3A
7
Which among the following is an active element?
Answer
D. None of these
A 3
[P.T.O.]
8
8 ASPDT switch has ——————— ON positions :
Answer
B. Two
9
Fuses protect the electric circuit against excessive : 3
Answer
C. Current
10
One of the following is not associated with PCB development process :
Answer
C. Soldering
11
The impurity atoms added to make a N type semiconductor are called :
Answer
A. Donors
12
Example for a pentavalent impurity atom is:
Answer
A. Phosphorous
13
The barrier voltage for Ga ——————— for a rise in temperature.
Answer
C. decreases
14
ASchottky diode has ———————_ junctions.
Answer
A. one
15
A reverse biased diode is equivalent to an ideal diode in series with a resistance in the range
of :
Answer
B. MQ
16
Zener diodes with breakdown voltage more than 6V operate under :
Answer
D. Avalanche breakdown
17
Which among the following operates in the reverse biased mode?
Answer
A. Photodiode
18
The PTV of a diode in a half wave rectifier is :
|
Answer
B. Vm
19
Find the D.C output voltage of a half wave rectifier circuit that operates at 230V, 50Hz AC |
supply with a transformer of turns ratio 10:1: |
Answer
Question Cancelled
20
The basic application of an inductive filter is in a circuit with :
Answer
D. heavy load currents
21
The % voltage regulation of a power supply which gives 95V under full load condition and
100V at no load condition 1s :
Answer
C. 5.3
22
SCRis:
Answer
B. Silicon Controlled Rectifier —
23
Which among the following is a bidirectional device with a gate control?
Answer
D. TRIAC
24
For proper amplification, a transistor must operate in the ———————_ region.
Answer
B. Active
25
Thermocouple is
Answer
C. transducer
26
A transistor amplifier connected in ______ configuration has the highest voltage gain.
Answer
A. CE
27
The power dissipation capability of a transistor can be increased by using
Answer
D. Heat sink
28
Which type of amplifier are used in the initial stages of PA system?
Answer
A. RC coupled
29
When sine wave is given to an amplifier, the output exists for less than a half cycle. This is
an example for ——————— amplifier.
Answer
C. elass C
30
In order to match a 164 loud apeaker to an amplifier to get an effective load of 10, the
transformer must be with turns ratio :
Answer
Question Cancelled
31
Inaclass B push pull amplifier the output signal gets distorted, with a time interval between
the positive and negative half cycles. This is called —_—_——_ distortion.
Answer
B. Crossover
32
FET is a ——————— controlled device.
Answer
B. Voltage
33
Type of feedback used in oscillator is :
Answer
A. Positive
34
In a Hartley oscillator, the tank circuit has a capacitance of 0.01 y4F and an inductance of
50mH. Determine the frequency of oscillation : ; |
Answer
Question Cancelled
35
The oscillator generally used to generate signals in the audio frequency range is :
Answer
C. RC phase shift
36
Answer
D. 180°
37
A bistable multivibrator circuit changes from one state to the other :
Answer
C. when there is a trigger pulae
38
Acircuit that generates a square wave from a sine wave is:
|
Answer
D. Schmitt trigger
39
The criteria for a good differentiating circuit is that its time constant should be -
Answer
A. Much smaller than that of the input signal
40
Acircuit in which a lamp is controlled by two switches in series is equivalent to a logic gate.
Identify the gate :
Answer
B. AND
41
The word ‘TELE’ in TELEVISION means :
Answer
B. at distance
42
Dimension of a TV receiver is specified by ————————- of the screen.
Answer
C. Diagonal length
43
Which among the following is not a complimentary colour :
Answer
D. Blue
44
The dominant spectral colour of the received light is termed as:
Answer
A. hue
45
Grassmans law is:
Answer
C. Y = 0.59G + 0.30R + 0.11B
46
Audible frequency range is: -
Answer
B. 20 Hz to 20 kHz )
47
Which of the following is not related to a tape recorder?
Answer
B. lens .
48
Highest capacity in an optical disc can be obtained by using a laser beam of ———————light.
Answer
D. blue |
49
Microwave frequencies are used for satellite communication because :
Answer
D. all of the above
50
The duration of H syne pulse is: |
Answer
A. 4.7 y8
51
TV channels used in India are in the ———————— band.
Answer
B. WHF
52
‘The intercarrier frequency used for TV transmission in India is :
|
Answer
C. 6.56 MHz
53
CCIR-B standard is popularly known as ———————_ system.
Answer
A. 625 line European
54
The TV programmes in America are brighter than in UK, because of :
Answer
A. high mains frequency
55
Vidicon camera tube is based on the principle of :
)
Answer
B. Photoconduction
56
Night Vision camera tubes are sensitive to :
Answer
D. TR radiation
57
————- deflection is used in CRO and ——————deflection in TV tubes. |
Answer
A. electrostatic, magnetic
58
PIL stands for:
Answer
C. Precision in line
59
When the raster gets stretched at the corners, it is called :
Answer
B. Pincushion effect
60
Picture tubes have high vacuum inside :
Answer
B. To ensure collision free movement of electrons
61
Which among the following belong to the TV tuner stage?
Answer
D. All of the above
62
H — oscillator's frequency is :
Answer
C. 15625 Hz
63
AFC circuit is included in the :
Answer
D. H-deflection section
64
H- sync pulse is separated from a V-sync pulse using
Answer
C. Differentiator
65
Which among the following is a merit of an IF stage :
Answer
D. all of the above
66
Which of the following is related with the production of electromagnetic waves by an
antenna?
Answer
A. Maxwell's equation
67
EHT required for a 50 cm size colour picture tube is about :
Answer
C. c) 25 KV
68
Identify the instrument for testing and alignment of TV receivers :
:
Answer
D. All of the above
69
The fault that occurs when the V-sweep oscillator frequency differs from that of V-sync
pulse :
Answer
A. Picture rolling
70
In order to get global coverage there can be a minimum of ———————-atellites in the
Geostationary orbit.
Answer
B. 3
71
In HDTV system active scanning lines per frame is : |
Answer
D. 1080
72
Yor the production of EHT for picture tube, the rectifier used on the secondary side of the |
transformer is :
Answer
C. Half wave
73
Which among the following is not an advantage of SMPS? |
Answer
B. High heat dissipation
74
Identify a technician control in a TV receiver :
Answer
A. V-hold
75
The picture tube in which three electron guns are mounted at 120° with respect to each other
is :
Answer
C. Delta gun
76
The monitor of a CCTV does not have the ——————— stage.
Answer
A. video detector
77
Radiowaves move in free space with a velocity:
Answer
A. 3 × 10⁸ m/s
78
Flickering can be eliminated by adopting :
Answer
B. Inter laced scanning
79
AM and FM radio receivers are very similar except for the presence of :
Answer
C. . Limiter
80
In TV programmes, picture is ——————— modulated and sound is ———————
modulated.
Answer
D. amplitude, frequency
81
The highest peak in the Eastern Ghats is called
Answer
Question Cancelled
82
Name of the plateau that lies between the Aravalli and the Vindhyan ranges
Answer
A. Malwa plateau
83
Who was the leader of the Kallumala Samaram?
Answer
D. Ayyankali
84
Language of the journal Mahratta published by Tilak
Answer
C. English
85
“No caste, no religion, and no god” : who said it?
Answer
D. Sahedaran Ayyappan
86
Leader of Pattini Jadha from Malabar to Madras :
Answer
B. A.K. Gopalan
87
Founder of Prathyaksha Raksha Sabha :
Answer
B. Poikayil Kumaragurudevan
88
“One communalism does not end the other, each feeds on the other and both fatten” who said
it?
Answer
B. Jawaharlal Nehru
)
89
Which one of the following offered an alternative for the separate electorate
Answer
C. ommunal
award) proposed by Prime Minister Ramsay MacDonald?
90
Editor of the Vivekodayam journal :
Answer
D. Kumaran Asan
91
Which city is going to host 2022 winter Olympics hence will become the first to host winter
and summer Olympics?
Answer
C. Beijing
92
Author of The Long Walk to Freedom :
Answer
B. Nelson Mandela
93
Nobel Prize in Economics for 2014 was awarded to :
Answer
A. Jean Tirole
94
Post-dated cheque is a comment made by Mahatma Ghandhi on:
Answer
A. Cripps Mission
95
Who was the founder of Khudai Khidmatgars?
Answer
C. Khan Abdul Gafar Khan
96
Who started the journal Al-/slam?
Answer
D. Vakkom Moulavi
97
‘Safety Valve’ theory is associated with one of the following :
Answer
A. Indian National Congress
98
Formation of Thriu-Cochin (Travancorre-Cochin) State was in :
Answer
B. 1949
99
Year of Vaikom Satyagrah :
Answer
A. 1924
100
NITI Ayog replaces one of the following :
Answer
B. Planning Commission
Discussion
Ask a doubt or share a tip.
No comments yet — start the discussion.