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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