LABORATORY TECHNICAL ASSISTANT-MRRTV-VHSE.pdf (Size: 1.38 MB / Downloads: 0)

Booklet Sr. No.
160322

Question Booklet
Alpha Code
218/2014
Total Number of Questions: 100Maximum Marks : 100Time : 75 Minutes

INSTRUCTIONS TO CANDDATES
1.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.
2.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.
4.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.
5.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.
6.The question booklet will be scaled at the middle of the right margin. Candidate should not open the question booklet, until the indication is given to start answering.
7.Immediately alter 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 tom or missing pages and if so 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.
8.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.Each question is proveded with four choices (A). (B), (C ) and (D) having one correct answer. Choose the correct answer and darken the bubble corresponding to (he question number using Blue or Black Ball Point Pen in the OMR Answer Sheet.
11.Each correct answer carries 1 mark and for each wrong answer 1/3 mark will be deducted. No negative mark for unattended questions.
12.No candidate w ill be allowed to leave the examination hall till the end of the session and without handing over his/her Answer Sheet to the Invigilator. Candidates should ensure that the Invigilator has verified all the entries in the Register Number Coding Sheet and that the Invigilator has affixed his. her signature in the space provided.
13.Strict compliance of instructions is essential. Any malpractice or attempt to commit any kind of malpractice in the Examination will result in the disqualification of the candidate.

1.In an RLC series circuit the impedance at resonance is
(A)Inductive
(B)Resistive
(C )Capacitive
(D)No impedance

2.In a step up transformer, the frequency of secondary voltage is
(A)Zero
(B)Greater than that of primary
(C )Equal to that of primary
(D)Less than that of primary

3.When two resistor R1 and R2 connected in parallel the total resistance R r will be 
(A) Rt=R1+R2
(B) R>=ivnC /R1 + R2
(C ) RT-R1 +R2 /R1 x R2 
(D) RT= r1 +r2

4.The SI unit of flux density is
(A)Maxwell (C ) Weber
(B) Tesla (D) Gauss

5.The impurity added to make P type semiconductor is
(A)Arsenic
(B) Antimony
(C ) Boron

(D) Silicon
6.When positive probe of ohmmeter is connected to anode and negative probe to the cathode of a diode, the meter indicates
(A)Low resistance (C ) High resistance
(B)No resistance (D) None of the above

7.The dc output voltage for a bridge rectifier without filter when 24 V is applied as input is
(A)10.8 V
(B) 24 V
(C )21.6 V
(D) 7.64 V

8.In a voltage regulator using Zener diode, the Zener is connected as
(A)Parallel with load, reverse biased
(B) Parallel with load, forward biased
(C ) Series with load, forward biased
(D) Series with load, reverse biased

9.When checking an NPN transistor using ohmmeter. the transistor junction is forward biased
(A)+ probe at collector. - probe at base 
(B) - probe at emitter. + probe at collector
(C )- probe at base. + probe at collector 
(D) + probe at base. - probe at emitter

10.A two stage RC coupled amplifier have stage gains of 30 and 40. The overall gain is
(A)70
(B) 1200
(C ) 120
(D) 12000

11.The astable multivibrator
(A)have two stable states
(B) have a stable state
(C ) is free running
(D) flip flop circuit

12.The time period of output waveform of an astable multivibrator is
(A)T = 0.69 RC
(B) T = 1.38 R1C1 + 1.38 R2C2
(C ) T = RC
(D) T = 1.38 RC

13.The noise generated by random variations in the arrival of electrons or holes at the electrodes of an Amplifying device is
(A)Thermal agitation noise
(B) Shot noise
(C ) Transit time noise
(D) Resistance noise

14.Secondary cell has the characteristic of
(A)Not rechargeable
(B) Dry cell
(C ) Rechargeability
(D) Both (A) and (B)

15.In a bridge rectifier the PIV across a non-conducting diode equals
(A)twice the peak value of ac input
(B)tour times the peak value of ac input
(C )half the peak value of ac input
(D)the peak value of ac input

16.The number of PN junctions in a JFET is
(A)1
(B) 2
(C ) 3
(D) no junctions

17.The SCR can be switched off by
(A)Low current drop out
(B)Applying forward break over voltage
(C )Applying valley voltage
(D)Applying negative trigger at its gate

18.The open by pass capacitor in a CE amplifier causes
(A) Increase in voltage gain
(B) Decrease in voltage gain
(C ) Introduces positive feedback
(D) Gain remains unchanged

19.Three resistors each with a value of 0.069 M ohm are connected in parallel. The total resistance is
(A)23 ohm
(B)230 K ohm
(C )0.23 M ohm
(D)23 K ohm

20.The power factor is defined as
(A)Peak power times 0.707
(B)Cosine of the phase angle between true power and apparent power
(C )Ratio of true power to apparent power
(D)Sine of the phase angle difference between voltage and current

21.The reciprocal of reactance is
(A)Reluctance
(B)Susceptance
(C )Admittance
(D)Impedance

22.In oscillators the Barkhausen criterion for oscillation is given by the condition
(A)Simple construction
(B)Less power dissipation of series transistor
(C )Short circuit current > maximum load current
(D)None of the above

23.Fold back current limiting has the following advantage over simple current limiting:
(A) AB=1 
(B)AB-0
(C ) AB > 1
(D)AB<I

24.NPN transistors are preferred to PNP transistors because of
(A)Easy use in +ve supply rail
(B)Higher switching speed
(C )A wide range of operating temperature
(D)the reasons mentioned in (A) and (B)

25.The LED which emits invisible light is
(A)Bicolour LED
(B)LASER LED
(C )Tricolour LED
(D) Infra red LED

26.The copper from copper clad boards is removed by using
(A) Thinner
(B)Etchant
(C ) Eraser
(D) Remover

27.The voltage gain of an RC coupled amplifier is 100. What is the gain in dB 
(A) 40
(B)20
(C ) 30
(D)10

28.The 1C number for quad 2 input NOR gate is
(A)7400
(B)7401
(C )7402
(D)7404

29.When JK flip flops are used to make frequency counters, the condition used is
(A)J=K=l
(B)J = 0.K=I
(C )J = K = 0
(D)J- I,K=0

30.The number of flip flops required to construct a mod 10 counter is
(A)2
(B)4
(C )3
(D)10

31.The simplification of Boolcan expression A + A B is
(A)AB
(B)A+ B
(C )AB
(D)A+ B

32.The number of PN junctions in a DE MOSFET is 
(A) I
(B) 0
(C ) 3
(D) 2

33.The opto coupler is most commonly called as
(A) Photo detector 
(B)Photo transistor
(C ) Opto isolator
(D)Darlington transistor

34.The function of RC snubber circuit in lamp dimmer is
(A)to slow down the rate of rise of voltage applied across the triac
(B)to provide smooth phase control
(C )to provide variable firing angle to triac
(D)to provide effective grounding

35.Semiconductor device BPW 34 is a
(A) photodiode
(B) photo and varacter diode
(C )varactor diode
(D) photo voltaic cell

36.For a 20" picture tube, the filament voltage is
(A) 3V dc (C ) 6.3 V dc
(B) 5V dc (D) 6.3V ac

37.In a TV Receiver, the linearity coil is connected in
(A)Parallel with horz deflection coil
(B)Series with horz detlection coil
(C )Series with horz driver transformer
(D)Parallel with LOT

38.Bitilar IF coils has the following advantage over other IF coils
(A)maximum energy transfer from primary and secondary' winding.
(B)small in size.
(C )maximum coupling between primary' and secondary winding.
(D)ferrite iron core is not used as former for winding.

39.The balun transformer consists of two small 470 pF capacitors inside it. The purpose of these capacitors is
(A)to block dc and permit ac
(B)facilitates static charging
(C )effective coupling of ac signal to tuner input
(D)to prevent damage due to lightning

40.The luminance signal is delayed by approximately
(A) l00 uS
(B) 60 pS
(C ) 120 uS
(D) 30 uS

41.The function of using a squelch circuit in a TV receiver is
(A)to boost the higher frequencies.
(B)to improve the frequency response of amplitiers.
(C )mute audio output during the absence of video signal.
(D)to improve the S/N ratio.

42. The sensitivity of an oscilloscope depends on
(A) vertical amplifier
(B) sweep oscillator
(C ) horz amplifier
(D) CRT

43.The impedance of Yagi - Uda antenna is
(A) 100 ohm
(B) 300 ohm
(C ) 200 ohm
(D) 75 ohm

44.Which of the following gate has high outputwhen its inputs are different ?
(A) NAND gate
(B) EX NOR gate
(C ) NOR gate
(D) EX OR gate

45.In RS flip flop using NAND gates, the race condition occurs when its inputs
(A) 0.0
(B) 0.1
(C ) 1,0
(D) 1,1

46.The BCD equivalent of decimal 38 is
(A) 10000011
(B) 00111000
(C ) 00111001
(D)00100110

47.The voltage across the diode in a half wave recti tier when it is non-conducting is 
(A) zero
(B) is constant at 0.3 V
(C ) 0.7 V
(D) same as the input voltage

48.PN junctions are called bipolar devices because
(A)they contain both P and N layers
(B)conduction is due to both hole and electron currents
(C )they work with both +ve and -ve supplies
(D)all of the above

49.AM broadcast band is
(A)1605 KHz to 30 MHz
(B) 10 to 30 KHz
(C ) 535 KHz to 1605 KHz
(D) 88 MHz to 108 MHz

50.In AM radio, the bandwidth of the IFTs used is
(A)455 KHz
(B)10.7 MHz
(C )440 KHz
(D)20 KHz

51.In radio receivers, the AGC bias voltage controls the gain of
(A)RF amplifier
(B)IF amplifier
(C ) AF amplifier
(D) All of the above

52.The colour sub carrier frequency of PAL system is
(A)4.35 MHz
(B)4.49 MHz
(C )4.36 MHz
(D)4.43 MHz

53.In TV the DC component of video signal is restored by using
(A)Clamping circuit
(B)RC circuit
(C )Clipping circuit
(D)LC circuit

54.The bandwidth of luminance signal in the colour TV system adopted in India is
(A)2 MHz
(B)4 MHz
(C )3.MHz
(D)3.5MHz

55.The type of polarization used for TV transmission is
(A) vertical
(B) elliptical
(C ) horizontal
(D) circular

56.BF245B has a maximum drain source voltage of
(A)18 V
(B)24V
(C ) 30 V
(D) 36 V

57.The unit decibel is used to measure
(A) power (C ) power level
(B) voltage (D) current

58.With feedback, the closed loop gain of an amplifier signifies
(A)the gain when its output terminals are closed
(B)the gain when no feedback is applied
(C )when the feedback factor exceeds unity
(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 is
(A) 160 MHz
(B) 100 KHz
(C ) 10 MHz
(D) 20 KHz

60.To produce sustained oscillations by an electronic oscillator
(A)feedback factor should be unity
(B)feedback should be negative
(C )phase shift should be 0°
(D)both (A) and (C )

61.The purpose of using de-emphasis circuit in KM receiver is
(A)making demodulation easy
(B)reducing high frequency noise
(C )increasing the amplitude of higher modulating frequencies
(D)reducing the amplitude of high frequencies in the audio signal

62. Which of the following is an indirect way of generating FM ?
(A) Reactance FET modulator
(B) Varactor diode modulator
(C ) Armstrong modulator
(D) Reactance bipolar transistor modulator

63.Antenna top loading increases
(A) bandwidth
(B)effective height
(C ) beam width
(D)input capacitance

64.One of the following is an application of RC circuit:
(A) Delay circuit
(B)Rectifier
(C ) Charger circuit
(D)Oscillator

65.Dissipation factor of a capacitor can be expressedas
(A) 1/Quality' factor
(B)Reactance/Resistance
(C ) Reactance (Xc)Quality factor
(D)Reactance/Quality' factor

66.One of the following is not used for etching :
(A) Ferric chloride
(B)Alkaline ammonia
(C ) Carbon tetra chloride
(D)Cupric chloride

67.Which LED has the lowest forw ardvoltage drop'?
(A) Red
(B)Green
(C ) Orange
(D)Yellow

68.The reverse breakdown in zener diode occurs due to
(A)hall effect
(B)avalanche effect
(C )breakdown effect
(D)induction effect

69.One of the following diode can store energy in their capacitance and then generate harmonics by releasing a pulse of current.
(A)Varactor diode
(B)Schottky diode
(C )PIN diode
(D)Step recovery diode

70.Which stage provides most of the gain and sensitivity for a super heterodyne radio receiver ?
(A)IF amplifier
(B)AF amplifier
(C )RF amplitler
(D)Mixer

71.Which of the following can demodulate SSB ?
(A)Ratio detector
(B)Phase discriminator
(C )Product demodulator
(D)Both (A) and (B)

72.The third letter in transistor type number indicates
(A)specific field of application
(B) temperature
(C ) voltage and power rating
(D) material of the device

73.The overall current gain of darlington transistor is equal to
p,&
(A) B1 / B2
(B) B2/B1
(C ) B1B2
(D) B1+B2

74.The output voltage of 7909 1C is
(A)+9 V 
(B)79 V
(C ) -79 V
(D) -9 V

75.A discharged battery should not be tested by using
(A) a battery hydrometer
(B) a high rate discharge tester
(C ) a voltmeter
(D) all of the above

76.Which device converts one form of energy into another ?
(A)Transducer
(B)Converter
(C )Transmitter
(D)Inverter

77.The output waveform of a relaxation oscillator is
(A)Rectangular
(B)Square
(C )Sawtooth
(D)Above mentioned waves

78.At what frequency range, do Marconi antenna is used ?
(A)VHF
(B)HF
(C ) MF 
(D) UHF

79.Which of the following antenna can be used as a reference antenna tor measuring the power gain of other antennas ?
(A) Half wave dipole
(B)Yagi antenna
(C ) Rhombic antenna
(D)Parabolic antenna

80.A 500 watt carrier is modulated to a depth of 80%. What is the total power in the modulated Wave ?
(A) 580 W 
(B)410 W
(C ) 660 W
(D) 606.66 W

81.‘Jathikummi’ was written by 
(A) Chattampi Swamikal
(B) Pandit karuppan 
(C )Vagbhatanandan
(D) Vaikunda Swann

82. The environmental activist associated with the protection of mangrove forests is
(A) John C. Jacob
(B)Sundarlal Bahuguna
(C ) Kallen Pokkudan
(D)Vandana Siva

83.Chief Election Commissioner of India is
(A) V.S. Sampath
(B)B.B. Tandon
(C ) V.S. Ramadevi
(D)T.N. Seshan

84.Metal known as “Quick-Silver'' is
(A) Bromine
(B)Gallium
(C ) Bismuth
(D)Mercury

85.The slogan “Chuck the American Model into the American Sea** is related to
(A) Nivarthana Agitation
(B)Punnapra-Vayalar Uprising
(C ) Moplah Rebellion
(D)Kayyur Riot

86.The novel that won 'Odakkuzhal Award' in 2013 is
(A) Marupiravi
(B)Avakasikal
(C ) Aarachaar
(D)Rain Deer

87.Kundara Proclamation was on
(A) January 23. 1809
(B)January 1, 1809
(C ) January II. 1809
(D)January 30. 1809

88.The National Pledge of India was composed by
(A) Pydimarri Venkata Subba Rao
(B) Rabindranath Tagore
(C )Bankim Chandra Chatterji
(D) Pingali Venkayya

89.The term “Bishop’’ is related to 
(A) Bridge
(B)Cricket
(C ) Football
(D)Chess

90.‘Madiba' is the pet name of 
(A) Gandhiji
(B)Abraham Lincoln
(C ) V.I. Lenin
(D)Nelson Mandela

91.‘Agnisakshi’ written by Lalithambika Antharjanam belongs to the category of
(A) Drama
(B)Poetry
(C ) Novel
(D) Short Story

92.Salim Ali is related to 
(A) Numismatics
(B)Philately
(C ) Graphology
(D)Ornithology

93.Mars orbiter launched into Earth's orbit on 5,h November 2013 by Indian Space Research Organisation is
(A)Mangalyaan
(B)Jugnu
(C )HAMSAT
(D)Chandrayaan

94.The first Legislative Council in an Indian State was
(A)Sri Chitra Stale Council
(B)Srimulam Popular Assembly
(C )Cochin Legislative Council
(D)Travancore Legislative Assembly

95.The recipients of'Bharat Ratna Award in 2013 are
(A)Lata Mangeshkar and Bismilla Khan
(B)M.S. Subbulakshmi and Chidambaram
(C )C.N.R. Rao and Sachin Tendulkar
(D)Ravi Sankar and Amartya Sen

96.The Article in the Indian Constitution that gives special status to Jammu and Kashmir is
(A) Article-356
(B)Article-370
(C )Article-352
(D)Article-360

97.The village in India known for the usage of Sanskrit for day-to-day communication is
(A) Mattur in Karnataka
(B) Udumbannur in Kerala
(C )Bahapur in Delhi
(D) Anand in Gujarat

98.‘Sadhujanaparipalanayogam** is related to
(A) Sreenarayana Guru
(B)K. Kelappan
(C )Sahodaran Ayyappan
(D)Ayyankali

99.The theatre performed in Kerala, recognised by UNESCO as a masterpiece of Oral and Intangible of Humanity is
(A) Ottanthullal
(B) Theyyam
(C ) Koodiyattam
(D) Padayani

100.‘Metro railman of India is 
(A) E.M.S. Namboothiripad (C ) M.K. Sreedharan
(B) J.R.D. Tata (D) E. Sreedharan