| Post Name | LABORATORY TECHNICAL ASSISTANT-MAINTENANCE AND REPAIRS OF RADIO AND TELEVISION |
|---|---|
| Department | KVHSE |
| Question Paper Code | 218/2014 |
| Date of Test | 31 December 2014 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
160822
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Booklet Sr. No.
j Question Booklet
Alpha Code
A
a
Maximum Marks: 100
Total Number of Questions: 100
a
INSTRUCTIONS TO CANDIDATES
The question paper will be given in the form of a Question Booklet. There will be four versions of
question booklets with question booklet alpha code viz. A. B,C & D.
The Question Booklet Alpha Code will be printed on the top left margin of the facing sheet of the
question booklet.
The Question Booklet Alpha Code allotted to you will be noted in your scaling position in the
Examination Hall,
If you get a question booklet where the alpha code does not match to the allotted alpha code in the
seating position. please draw the attention of the Invigilator IMMEDIATELY.
The Question Booklet Serial Number is printed on the top right margin of the facing sheet. If your
question booklet is un-numbered, please get it replaced by new question booklet with same alpha
code.
lhe question booklet will be sealed at the middle of the nght margin. Candidate should not open the
question booklet, until the indication ts given to start answering.
Immediately after the commencement of the examination, the candidate should check that the
question booklet supplied to him contains all the 100 questions in serial order, The question booklet
does not have unprinted or torn or missing pages and ifso he/she should bring it to the notice of the
Invigilator and get it replaced by a complete booklet with same alpha code. This is most important.
A blank page of paper is attached to the question booklet, This may be used for rough work.
9
Please read carefully all the instructions on the reverse of the Answer Sheet before
marking your answers.
10
Answer
B. ,
2
Inan RLC series circuit the impedance at resonance is
Answer
C. Capacitive
3
Ina step up transformer, the frequency of secondary voltage is
Answer
D. Less than that of primary
4
= The SI unit of flux density is
Answer
B. Tesla
5
>. The impurity added to make P type semiconductor is
Answer
C. Boron ;
6
When positive probe of ohmmeter is connected to anode and negative probe to the
cathode of a diode, the meter indicates
Answer
A. Low resistance
7
The de output voltage for a bridge rectifier without filter when 24 V ne 'S applied as input
is |
Answer
C. 216V
8
Ina voltage regulator using Zener diode, the Zener is connected as
Answer
A. Parallel with load, reverse biased
9
When checking an NPN transistor using chmmeter. the transistor junction is forward
biased
Answer
D. + probe at base. â probe at emitter
10
Atwo stage RC coupled amplifier have stage gains of 30 and 40. The overall gain is
Answer
B. 1200
11
The astable multivibrator |
Answer
C. is free running
12
The time period of output waveform of an astable multivibrator is
Answer
D. T = 1.38RC
13
The noise generated by random variations in the arrival of electrons or holes at the
electrodes of an Amplifying device is
Answer
B. Shot noise
14
Secondary cell has the characteristic of
Answer
C. Rechargeability
15
Ina bridge rectifier the PIV across a non-conducting diode equals
Answer
D. the peak value of ac input
16
The number of PN junctions in a JFET ts
Answer
B. 2
17
The SCR can be switched off by
Answer
A. Low current drop out
18
The open by pass capacitor in a CE amplifier causes
Answer
B. Decrease in voltage gain
19
Three resistors each with a value of 0.069 M ohm are connected in parallel. The total
resistance 1s
Answer
D. 23K ohm
20
The power factor is defined as
Answer
C. Ratio of true power to apparent power
21
The reciprocal of reactance is
Answer
B. Susceptance
22
In oscillators the Barkhausen criterion for oscillation is given by the condition
Answer
A. Aβ = 1
23
Fold back current limiting has the following advantage over simple current limiting :
Answer
B. Less power dissipation of series transistor
24
NPN transistors are preferred to PNP transistors because of
Answer
B. Higher switching speed
25
The LED which emits invisible light is
Answer
D. Infra red LED
26
The copper from copper clad boards is removed by using
Answer
B. Etchant
27
The voltage gain of an RC coupled amplifier is 100. What is the gain in dB ?
Answer
A. 40
28
The IC number for quad 2 input NOR gate is
Answer
C. 7402
29
When JK flip-flops are used to make frequency counters, the condition used is:
Answer
A. J = K = 1
30
The number of flip flops required to construct a mod |0 counter is
Answer
B. 4
31
The simplification of Boolean expression A + A B is
Answer
D. A+B
32
The number of PN junctions in a DE MOSFET is .
Answer
B. 0
33
The opto coupler is most commonly called as
Answer
C. Opto isolator
34
The function of RC snubber circuit in lamp dimmer is |
Answer
A. to slow down the rate of rise of voltage applied across the triac |
35
Semiconductor device BPW 34 is a
Answer
C. varactor diode
36
Fora 20â picture tube, the filament voltage is
Answer
D. 63V ac
37
Ina TV Receiver, the linearity coil is connected in
Answer
B. Series with horz deflection coil |
38
Bifilar IF coils has the following advantage over other IF coils
Answer
A. maximum energy transfer from primary and secondary winding,
39
The balun transformer consists of two small 470 pF capacitors inside it. The purpose of
these capacitors is
Answer
D. to prevent damage due to lightning
Z218/2014 6 A
4 & |
40
The luminance signal is delayed by approximately
Answer
B. 60 Us
41
The function of using a squelch circuit in a TV receiver ts
Answer
C. mute audio output during the absence of video signal.
42
The sensitivity of an oscilloscope depends on
Answer
A. vertical amplifier
43
The impedance of Yagi â Uda antenna is
Answer
B. 300 ohm
44
Which of the following gate has high output when its inputs are different ?
Answer
D. EX OR gate
45
In RS flip flop using NAND gates, the race condition occurs when its inputs are
Answer
A. 0,0
46
The BCD equivalent of decimal 35 1s
Answer
B. 00111000
47
The voltage across the diode in a half wave rectifier when it is non-conducting 1s
Answer
D. same as the input voltage
48
PN junctions are called bipolar devices because
Answer
B. conduction is due to both hole and electron currents
49
AM broadcast band is
Answer
C. 335 KHz to 1605 KHz
50
In AM radio, the bandwidth of the IFTs used is
Answer
Question Cancelled
51
Si. In radio receivers, the AGC bias voliage controls the gain of
Answer
B. IF amplifier
52
SI. The colour sub carrier frequency of PAL system is
Answer
D. 4.43 MHz
53
In TV the DC component of video signal is restored by using
Answer
A. Clamping circuit
54
The bandwidth of luminance signal in the colour TV system adopted in India is
Answer
B. 4MHz
55
The type of polarization used for TV transmission is
Answer
C. horizontal
56
BF245B has a maximum drain source voltage of
Answer
D. 36V
57
The unit decibel is used to measure
Answer
C. power level
58
With feedback. the closed loop gain of an amplifier signifies
Answer
D. the gain when the feedback is applied |
59
The gain bandwidth product of an amplifier is 4 MHz. Its closed loop gain is 40. The new
Bandwidth 1s
Answer
B. 100 KHz
60
To produce sustained oscillations by an electronic oscillator
Answer
D. both
61
The purpose of using de-emphasis circuit in FM receiver is
Answer
D. reducing the amplitude of high frequencies in the audio signal
A 9 218/2014
. ee
62
Which of the following is an indirect way of generating FM ?
Answer
C. Armstrong modulator
'
63
Antenna top loading increases
Answer
B. effective height
64
One of the following is an application of RC circuit :
Answer
A. Delay circuit
65
Dissipation factor of a capacitor can be expressed as
| B Reactance
Answer
A. Quality factor
66
One of the following is not used for etching :
Answer
C. Carbon tetra chloride
67
Which LED has the lowest forward voltage drop ?
Answer
A. Red
68
The reverse breakdown in zener diode occurs due to
Answer
B. avalanche effect
69
One of the following diode can store energy in their capacitance and then generate
harmonics by releasing a pulse of current.
Answer
D. Step recovery diode
70
Which stage provides most of the gain and sensitivity for a super heterodyne radio |
receiver ?
Answer
Question Cancelled
71
Which of the following can demodulate SSB?
Answer
C. Product demodulator
72
The third letter in transistor type number indicates
Answer
A. specific field of application
73
The overall current gain of darlington transistor is equal to
Answer
C. βâβâ
74
The output voltage of 7909 IC is
Answer
D. -9V
75
A discharged battery should not be tested by using
Answer
B. a high rate discharge tester
76
Which device converts one form of energy into another ?
Answer
A. Transducer
77
The output wavetorm of a relaxation oscillator is
Answer
D. Above mentioned waves
78
At what frequency range, do Marconi antenna is used ?
Answer
C. MF -
79
Which of the following antenna can be used as a reference antenna for measuring the
power gain of other antennas ?
Answer
A. Half wave dipole
80
A 500 watt carrier is modulated to a depth of 80%. What is the total power in the
modulated Wave ?
Answer
C. 660W
81
âJathikummiâ was written by
Answer
B. Pandit Karuppan
82
The environmental activist associated with the protection of mangrove forests is
Answer
C. Kallen Pokkudan
83
Chief Election Commissioner of India ts
Answer
A. V.S. Sampath
84
Metal known as âQuick-Silverâ is
Answer
D. Mercury
85
The slogan âChuck the American Model into the American Sea⢠is related to
|
Answer
B. Punnapra-Vayalar Uprising
86
The novel that won âOdakkuzhal Awardâ in 2013 is
Answer
C. Aarachaar
87
Kundara Proclamation was on
Answer
C. January 11. 1809
88
The National Pledge of India was composed by
Answer
A. Pydimarri Venkata Subba Rao
89
The term âBishopâ is related to
Answer
D. Chess
90
âMadibaâ is the pet name of
Answer
D. Nelson Mandela
91
âAgnisakshiâ written by Lalithambika Antharjanam belongs to the category of |
Answer
C. Novel
92
Salim Ali is related to
Answer
D. Ornithology
93
Mars orbiter launched into Earthâs orbit on 5" November 2013 by Indian Space Research
Organisation Is
Answer
A. Mangalyaan
94
The first Legislative Council in an Indian State was
Answer
B. Snmulam Popular Assembly
95
The recipients of âBharat Ratna Award" in 2013 are
Answer
C. C.N.R. Rao and Sachin Tendulkar
96
The Article in the Indian Constitution that gives special status to Jammu and Kashmir is
Answer
B. Article â 370
97
The village in India known for the usage of Sanskrit for day-to-day communication is
Answer
A. Mattur in Kamataka
98
âSadhujanaparipalanayogamâ is related to
Answer
D. Ayyankali
99
The theatre performed in Kerala, recognised by UNESCO as a masterpiece of Oral and
Intangible of Humanity 1s
Answer
C. Koodiyattam
100
*Metro railman of Indiaâ is
Answer
D. E. Sreedharan
A 15 2158/2014
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