TRADESMAN - ELECTRONICS - TECHNICAL EDUCATION.pdf (Size: 1.03 MB / Downloads: 1)

1.The ripple factor of a halfwave rectifier is________.
(A)0.482
(B)0.812
(C )40.6
(D)1.21

2.Which of the following is tine fastest switching component ?
(A)MOSFET
(B)JFET
(C )BJT
(D)pentode

3.The final power amplifier in a radio transmitter station is usually _____.
(A)Class A
(B)Class B
(C )Class C
(D)Class AB

4.In AM radio receiver, the oscillator frequency is________.
(A) incoming signal - 455 kHz
(B) incoming signal + 455 kHz
(C ) equal to signal frequency
(D) equal to 455 kHz

5.The voltage gain of an emitter follower configuration can not be more 

than_________.
(A)I
(B)0.5
(C )10
(D)100

6.The doping concentration in zener diode is__________.
(A)verylow
(B)very high
(C )zero
(D)infinity

7.Binary number system uses_____________symbols.
(A)16
(B)10
(C )8
(D)2

8.Trimmer is a variable___________.
(A)resistor
(B)inductor
(C )capacitor
(D)none of these

9.The number of turns in secondary of a___________transformer is more than 

the primary.
(A)step - down
(B)step - up
(C )230 V to 6 V’ 
(D)11 kV to 230 V

10.In a PN junction diode the harrier potential offers opposition to_________
(A)Minority charge carriers in both regions
(B)Majority charge camers in both regions
(C )Holes in N region
(D)Electrons in P region

11.Negative feedback in amplifier___________the stability of its voltage 

gain.
(A)increases
(B) decreases
(C ) does not affect 
(D) none of these

12. The time-base of a CRO is______waveform.
(A) sawtooth
(B) sine
(C ) square
(D) rectangular

13. Moving iron meter is usually used for measurement of_
(A)AC and DC 
(B) DC only
(C ) AC only
(D) None of these

14. Integrator is a........filter.  
(A) high pass
(B) low pass
(C ) band pass
(D) band stop

15.OP-AMP may be used as :
(A)summing amplifier (C ) differentiator
(B) voltage comparator (D) all the above

16.The timer IC 555 is available in___________package.
(A)^ pin
(B)14 pin DIP 
(C ) 8 pin DIP 
(D)16 pin DIP

17.IGBT stands for_____________.
(A)Insulated Gate-Based Thyristor
(B)Insulated Gate Bipolar Thyristor
(C ) Intrinsic Gate Bipolar Transistor
(D) Insulated Gate Bipolar Transistor

18.IC 7912 is
(A)Two input Quad XNOR gate
(B)Two input Quad XOR gate
(C )Negative voltage regulator for 12 V
(D)Positive voltage regulator for 12 V


19.In On-line UPS, the lottery is connected
(A) All the time to the inverter
(B) During mains failure
(C ) During charging time only
(D) All the above

20. The program counter in 8085 microprocessor is of ________bit.
(A) 8
(B) 16
(C.) 4
(D) 32

21. Which of the following is a bidirectional device ?
(A) Zener diode 
(B) SCR
(C ) l.ED
(D) Triac

22. Henry is the unit of ___...
(A) Capacitance 
(B) Power
(C ) Inductance 
(D) Resistance

23. A hall adder circuit can add _ bits at a time. 
(A) 2
(B) 3
(C )4
(D) 1

24.Which of the following is a single input flip-flop ?
(A) R-S
(B) D
(C ) JK
(D) Clocked RS

25.Time constant of RC circuit is the Time during which capacitor voltage 

rises to of its final steady value.
(A)50
(B)100
(C )63
(D)70
.
26.Which of the following is an insulator ?
(A) Ferrite
(B) Germanium 
(C ) Silicon
(D) Zinc

27.Antimony is a
type doping material.
(A) Trivalent
(B) Semiconductor 
(C ) Acceptor
(D) Pentavalent

28.A dynamic microphone is a......type transducer.
(A) Acoustical 
(C ) Optical
(B) Thermal
(D) Variable resistance

29.The function of NOT gate is to_____________.
(A)Invert an input signal
(B)Add two input signals
(C )Multiply two input signals
(D)Perform as a universalgate

30.The channel width in PAL system is_______________.
(A)~ 3.5 MHz
(B)4.433MHz 
(C )38.9MHz 
(D)7 MHz

31.Camping circuits make use of adding a____________level into an ac signal.
(A) Zero
(B)DC
(C )AC
(D)Negative

32.Which of the following statements is not related to Ohm's law ?
(A)Current is directly proportional to Pd
(B)Current is inversely proportional to resistance
(C )Law is applicable to dc circuits
(D)Law is independent of temperature

33.Which of the following is not used for making LED ?
(A)Germanium
(B)Gallium arsenide
(C )Gallium phosphide
(D)Gallium arsenide phosphide

34.In SCR if the conduction angle is less, the output, is________.
(A)More
(B)Less
(C )Not affected
(D)Infinity

35.The ripple output frequency of bridge rectifier in 50 Hz supply 

is________Hz.
(A) 50
(B)25‘ 
(C ) 100
(D) 60

36.At saturation point of transistor, VCE___________volt.
(A)Zero
(B)Vcc
(C )One
(D)Infinite

37.In a multistage amplifier, the overall voltage gain is equal to ________of 

the gains of
individual stages.
(A)Sum
(B)Half
(C )Product
(D)Gain of one stage

38.AM wave has________________side bands.
(A)no
(B)one
(C )a number of
(D)two

39.IF in AM radio receivers is obtained by__________.
(A)Detection
(B)Heterodyning
(C )Rectification
(D)Amplification

40.Barkhausen criterion is important in____________.
(A) Oscillation 
(B) Rectification 
(C ) Doping
(D) Demodulation

41.____________oscillator is not a sinusoidal oscillator.
(A) RC phase shift 
(B) Wien bridge 
(C ) Crystal
(D) UJT relaxation

42.The statement not related to a diac is____________.
(A) It is a two terminal device
(B) It is an SCR without its gate terminal
(C ) It can be used to trigger a triac
(D) It is a bidirectional switching device

43.The image continuity in motion pictures is obtained by the property 

of_________.
(A)Doppler effect
(B)Skin effect
(C )Photoelectric effect
(D)Persistenceof vision

44.dB is used to measure____________.
(A)power level
(B)power
(C )voltage
(D)magnetic flux

45.Cross over distortion occurs in________type of amplifiers.
(A)Class A
(B)Class B
(C )Class C
(D)Push-pull

46.The leakage current in a transistor is__________dependent on.
(A)Temperature
(B)Voltage
(C )Majority charge carriers
(D)Input signal

47.BJT is___________.
(A) A type of FET
(B)A typo of UJT
(C ) NPN or PNP transistor
(D) Bidirectional Junction Transistor

48.Atomic number of Silicon is____________.
(A)10
(B)32
(C )14
(D)16

49.Yellow, Violet. Red indicates__________Ohms.
(A)4.7
(B)470
(C )4.7 k
(D)47 k

50.__________loss is not a transformer loss.
(A)Core
(B)Copper
(C )Hysterisis
(D)Dielectric

51.SCRhas____________layers.
(A)PNNP
(B)PNPN
(C )PPNN
(D)NPPN

52.A logic circuit that has a high output only when all its inputs are low 

is_______
(A)AND
(B)NAND
(C )NOR
(D)OR

53.88-108 MHz band of frequencies is used for____________broadcasting.
(A)TV'
(B)FM
(C )AM
(D)Defence

54.In FM receivers, limiter is used_________.
(A)For automatic gain control
(B)To eliminate amplitudevariations
(C )To maintain minimum S/N ratio 
(D)To detect the audio signal from carrier

55.The frequency range used for RADAR is_____________.
(A)UHF
(B)VHF
(C )UHFand Microwave
(D)Microwave

56.Approximate distance of geostationary satellite lrom earth is _
(A)15,625 kms
(B)30,000 kms
(C )36,000kms
(D) 80,000 kms

57.Recording in compact disc is done with the help of_____
(A)Laser
(B)UV light
(C )IR light
(D)Noneof these

58.__________is not a semiconductor memory.
(A)RAM
(B)ROM
(C )CD
(D)Cache

59.A two diode rectifier requires___________.
(A)Direct ac mains
(B)Centre tapped transformer
(C )Low P1V rated diodes
(D)No filters for smoothening

60.The processor chip 8085A has ____________pins.
(A)14
(B)16
(C )40
(D)80

61.The heart of a CRO is.
(A)Cathode ray tube
(B)Power supply
(C )Vertical amplifier
(D)Horizontal amplifier

62.The function of the emitter bypass capacitor in a CE amplifier is 

to_________.
(A)Act as a high resistance path for dc signals
(B)Act as a low resistance path for dc signals
(C )Provide a low resistance path for ac signals
(D)Provide a high resistance path for ac signals

63.I he minimum forward bias voltage for a Germanium PN junction to set into 

conduction is Volt.
(A)0.7
(B)0.6
(C )0.1
(D)0.3

64.The width of the collector layer in a transistor is________.
(A)Equal to that of the base region
(B)Less than that of the base region
(C )Much greater than that of the base region
(D)Much less than the emitter region

65.In NPN transistors, the majority charge carriers are__________.
(A) Holes
(B) Electrons
(C ) Positive charges 
(D) None of those

66.__________diode is used in reverse biased condition for its normal 

working.
(A)Zener
(B)Light emitting 
(C )Rectifier
(D)Signal

67.An etchant used in PCB making is _____
(A) Ferric Chloride
(B) Ammonium Chloride
(C ) Carbon Tetrachloride
(D) Copper Sulphate

68.The most common component used in ripple filter circuits is_____________.
(A)Inductor
(B)Resistor
(C )Capacitor
(D)Diode

69.__________voltage is the maximum reverse voltage that a diode can 

withstand.
(A)Peak inverse 
(B)Peak
(C )Cut - in
(D)Barrier

70.When two capacitors are connected in series, the effective capacitance 

is__________.
(A)Increases
(B)Decreases
(C )Doubles
(D)Becomesunity

71.When ten resistors each of 47 O are connected in parallel, the net 

resistance of the combination
is___________Ohms.
(A)47
(B)10
(C )470
(D)4.7

72.The quality factor 'Q' of an ideal inductor is_________.
(A)Unity
(B)Zero
(C )0.63
(D)Infinity

73.is not a variable resistor.
(A)Preset
(B)Varactor
(C )Rheostat
(D)Potentiometer

74.Insulation resistance can be measured using_____________,
(A)Multimeter
(B)Megger
(C )Galvanometer
(D)Clampmeter

75.Bistable multivibrator is also called as___________.
(A) Monoshot
(B)Sinusoidal oscillator
(C ) Free running multivibrator
(D) Flip-flop

76.Colpitts oscillator uses__________feedback.
(A)no
(B)positive
(C )negative
(D)noneofthese

77.The binary number 1111 corresponds to______________ hexadecimal number.
(A)A
(B)B
(C )D
(D)F

78.The voltage regulation of an ideal regulated power supply 

is______________%.
(A)50
(B)100
(C )1
(D)0

79.The input impedance of a JFET is high because
(A)its gate is insulated from the channel
(B)its input is reverse biased
(C )of the presence of the substrate
(D)all the above

80._________has no gate terminal.
(A) MOSFET
(B) Triac
(C ) SCR
(D) Diac

81.Mazagoan is famous for :
(A) Iron ore export
(C ) Co-operative dairy farming
(B)Locomotive engineering works 
(D) Ship building

82. Which of the following rivers flows west ward ?
(A) Krishna
(B) Kavery
(C ) Narmada
(D) Mahanadi

83.Which is not an ancient town ?
(A) Varanasi
(B) Mumbai
(C ) Pataliputra 
(D) Prayag

84.The least populated Union Territory in India is :
(A) Pondicherry
(C ) Lakshadweep
(B)Andaman Nicobar Island 
(D) Chandigarh

85.Pradhan Mantri Fasal Bima Yojana (PMFBY) aimed to :
(A)Crop Insurance Scheme
(B)Eradication of Poverty in Urban Areas
(C )National Rural Development
(D)Upliftment of The Poor People

86.The Daruli March was organised by' Gandhiji to :
(A)Protest against atrocities on Harijans
(B)Break the Salt Laws
(C )Ask for pooma swaraj
(D)Oppose Simon Commission

87.New India and Commonweal two news papers during the Home Rule were edited 

by :
(A)Mrs. Annie Besant
(B)BalgangadharaTilak
(C )Gopala Krishna Gokhale
(D)Lala Lajpat Rai

88.Who is the first women president of Indian National Congress ?
(A)Sucheta Kripalini
(B)Sarojini Naidu
(C )Rajkumari AmrithKour
(D)Mrs. Annie Besant

89.Which is the Naval Port in Kerala ?
(A)Bepur
(B)Kochi
(C )Neendakara
(D)Alappuzha

90.Parambikulam Wildlife Sanctuary is in :
(A)Palakkad
(B)Thiruvananthapuram
(C )Pathanamthitta
(D)Idukki

91.In which year Mahatma Gandhi visited Sree Narayan Guru ?
(A)1921
(B)1920
(C )1925
(D)1922

92.Which movement was started by Kumara Guru at Iraviperur ?
(A)Ananda Mahasabha
(B)Atma Vidya Sangam
(C ) Sahodara Sangam
(D) Prathyaksha Raksha Daiva Sabha

93.Who is the founder of Sadhujana Paripalana Yogam ?
(A)Vaikunda Swamikal
(B)Ayyankali
(C )Swami Vagbhatananda
(D)Brahmananda Shivayogi

94.Who popularised Arabic Malayalam by publishing, monthly called AI Islam ?
(A) Vaikkom Muhammed Basheer
(B) Vakkom Abdul Khader Maulavi
(C )Moidu Maulavi
(D)Kalathingal Muhammed

95.Who led the Vimochana Samaram which resulted in the dismissal of the EMS 

Namboodiripad Ministry 7
(A)E.V. Ramaswami Naicker
(B)V.T. Bhattathiripad
(C )Mannath Padmanabhan
(D)K. Kelappan

96.Who won the women's single tennis title in Wimbledon, 2016 ?
(A)Angelique Kerber
(B)Veenus Williams
(C )Elena Vesnina
(D)Serena Williams

97.Who is the present Chief Minister of Arunachal Pradesh ?
(A)Pema Khandu
(B)Nabam Tuki
(C )Khaliko Pul
(D)Tathagath Roy

98.Who is the Chief Executive Officer (CEO) in NITI Aayog ?
(A)Raghuram Rajan
(B)Vishal Sikha
(C )Amitab Kant
(D)Amitabachan

99.Who is the famous Bollywood filmstar selected as Good Will ambassador to 

Rio-Olympic Indian Team ?
(A) Amir Khan 
(B) Sharuk Khan 
(C ) Akshay Kumar 
(D) Salman Khan

100.In which date India launched IRNSS - 1G horn Satheesh Dhawan Space Centre 

Sri Hari
Kotta ?
(A)28th April, 2016
(B)22nd June. 2016
(C )22nd June, 2014
(D)22nd October, 2008