Electronics 24jan2014(2)

8/12/2019 Electronics 24jan2014(2)

1/37

Uttar Pradesh Power Corporation Limited

Subject : Junior Engineer Trainee Electronics Engineering

Q.1 1) 2) 3) 4)

Q.2 ?

1) 2) 3) 4)

Q.3 1) 2) 3) 4)

Q.4 1) 2) 3) 4)

Page 1 of 37

1/14/2014file://C:\Users\IONASSESSMENT\Desktop\KEY_ACTUAL_uppcl\Question Paper with c ...


2/37

Q.5 ( ) ?

1) 2) 3) 4)

Q.6 ?1) 2) 3) 4)

Q.7 Ampere is the unit of

1) Electric Charge

2) Electricity Current

3) Resistance

4) Magnetic field

Q.8 1) 2) 3) 4)

Q.9 Where will be the common wealth games in year 2018 will be held

1) Jamaica

2) Australia

3) Malaysia

4) Newzealand

Q.10

?1) 2) 3)

Page 2 of 37



3/37

4)

Q.11 ?1) 2) 3) 4)

Q.12 ?1) 2) 3) - 4)

Q.13 ?1) 2) . 3) 4)

Q.14 The International human right day is celebrated on1) 10th December

2) 1st May

3) 30th April

4) 24th October

Q.15 ?

1) 1911

2) 1931

3) 1921

4) 1941

Q.16

Page 3 of 37



4/37

1) 2) 3) 4)

Q.17 ?1) 2)

3) 4)

Q.18 ?

1) 2) 3) 4)

Q.19 ?1) 30 2) 28 3) 31

4) 29

Q.20 ?

1) 2) 3) 4)

Q.1Which is the missing number in the following number sequence?2, 2, 4, 12, ? , 240

1) 24

2) 60

3) 40

Page 4 of 37



5/37

4) 48

Q.2 Choose the missing number from among the alternatives.

1) 135

2) 210

3) 216

4) 140

Q.34 ,

1 -

- ?

1) 4

2) 8

3) 12

4) 0

Q.4 H , P , R , Y K

, ?

H P R Y K P R H A K H P R Y K P R H A K H P R ?

1) KAMAL2) PANKAJ

3) HIREN

4) YOGESH

Q.5Which of the following sets of numbers does not belong to the group?

1) 7, 19, 13

Page 5 of 37



6/37

2) 11, 25, 18

3) 18, 26, 22

4) 24, 32, 27

Q.6 25% 150 ?1) Rs.225

2) Rs.125

3) Rs.175

4) Rs.200

Q.7 If 6 x 9 = 4530, and 3 x 4 = 2015, then 5 x 7 = ?

1) 2820

2) 25353) 5235

4) 3525

Q.8B, A 1 C 3 C, D 3 A, D ?

1) 5 km.

2) 7 km.

3) 4 km.

4) 4.5 km.

Q.9::

::

TREAD : UQFZE :: ? : SHWDS

1) REVEL

2) TIRED

3) TUSAR

4) RIVER

Q.10How many triangles are there in the following figure?

Page 6 of 37



7/37

1) 6

2) 12

3) 10

4) 8

Q.11 , P 13 Q 9 P Q 9 ?1) 33

2) 30

3) 32

4) 31

Q.12 ?1) HPL

2) MRP

3) CGE

4) NTQ

Q.13 ( I II) , ,

? : (1)

(2)

: I. II.

1) I II 2) I 3) I II

4) II

Q.14

A, B, C D B C A B C D A D

Page 7 of 37



8/37

, ?

1) C

2) A

3) B4) D

Q.15 4 ?

1) 6

2) 2

3) 14) 5

Q.16 , 7 ?

6 7 3 5 7 5 7 1 8 7 7 2 5 4 7 9 3 7 5 5 7 7

1) 5

2) 23) 4

4) 3

Q.17 A clock gains 3 seconds every hour. If it is set right at 7 am on Sunday, what time willit show at 5 pm on the next Tuesday?

1) 5 hours 2 minutes 24 seconds




Q.18 A rectangular block of 6 cm x 21 cm x 27 cm is cut into a number of exactly equalcubes. The least possible number of cubes will be:

1) 126

2) 106

3) 63

Page 8 of 37



9/37

4) 54

Q.19 Pointing to a man, Deepak said, He is the eldest son of the only brother of my sistersfather. How is the man related to Deepak?

1) cousin

2) brother

3) nephew

4) uncle

Q.20 Which is the correct order of signs to replace the asterisks so that the followingexpression becomes mathematically meaningful?

8 * 4 * 2 * 10 * 6

1) , -, =, +2) , +, =, -

3) +, , =, -

4) x, , =, -

Comprehension:

I - I - I - , I , - I - I

Q.1 SubQuestion No. :1 ?

1) 2) 3) 4)

Q.2 SubQuestion No. :2

- ?1) 2) 3)

Page 9 of 37



10/37

4)

Q.3 SubQuestion No. :3 ?

1)

2) - 3) 4)

Q.4 ?1) , , 2)

3) , , 4)

Q.5 ?1) .2) 3) 4)

Q.6 ' ' ?1) 2) 3) 4)

Q.7 ' -1) 2) 3) 4)

Q.8

?1)

Page 10 of 37



11/37

2) 3) 4)

Q.9 ' ?1) 2) 3) 4)

Q.10 ' -1)

2) 3) 4)

Q.1 The expression F=X.Y.A.B is to be realized using two input NAND gates only. Theminimum number of NAND gates required for this design is

1) 6

2) 4

3) 3

4) 5

Q.2 In 8085 programming SIM is used for

1) Serial outputting

2) Serial inputting

3) Setting flags

4) Dialling numbers

Q.3Which of the following is most widely used circuit for processing of the transducersoutputs

1) Inverting amplifier

2) Common collector amplifier

3) Common base amplifier

4) Instrumentation amplifier

Page 11 of 37



12/37


13/37

4) For increasing current gain

Q.10 If one wants to design a binary counter, preferred type of flip-flop is

1) D Type

2) Latch3) JK type

4) SR Type

Q.11 Circuit switching takes place at the ________ layer

1) Data line

2) physical

3) transport

4) network

Q.12 Common collector amplifier is used

1) For frequency conversion and impedance matching

2) For current amplification and impedance matching

3) For oscillation and impedance matching

4) For voltage amplification and impedance matching

Q.13 TRAP is

1) Maskable , highest priority and software interrupt2) Nonmaskable , highest priority and hardware interrupt

3) Nonmaskable , highest priority and software interrupt

4) maskable , lowest priority and hardware interrupt

Q.14 MOV A, @R1 will copy

1) The content of RAM location pointed by R1 to accumulator

2) The content of accumulator to RAM location pointed by R1

3) The content of accumulator to R14) The content of R1 to accumulator

Q.15Clamper circuits use

1) Diode only

2) Transistors and resistors

3) Diode, transistors and resistors

Page 13 of 37



14/37


15/37

1) PMOS+PMOS

2) VMOS+PMOS

3) NMOS+PMOS

4) VMOS+NMOS

Q.22 If READY pin of 8085 is low it means

1) 8085 is ready but peripheral device is not ready

2) Both 8085 and peripheral device are not ready

3) 8085 is not ready but peripheral device is ready

4) Both 8085 and peripheral device are ready

Q.23 De-emphasis circuit is used

1) After modulation

2) After detection

3) Before modulation

4) Before detection

Q.24 In television ,video and sound signal are respectively

1) FM and AM

2) AM and FM

3) FM and PCM

4) PCM and DM

Q.25 In an analog multimeter ohm scale is

1) linear and reverse to the current scale

2) linear and reverse to the voltage scale

3) and current scale are equal

4) Non linear and reverse to the current scale

Q.26If D, G and denote the directivity, power gain and efficiency of an antenna , thenwhich of the following relation true

1) DG=12) =D.G3) D= G4) D=G/

Q.27

Page 15 of 37



16/37

Which of the following statement is correct?

1) Bandwidth of FM signal is equal to AM signal

2) Bandwidth of FM signal can be more or less than AM signal

3) Bandwidth of FM signal is lesser than AM signal

4) Bandwidth of FM signal is larger than AM signal

Q.28 Which of the following statement is correct

1) Induction heater consists of an electromagnet, through which a high-frequency alternating current (AC) is passed

2) Induction heater consists consists of a resistor, through which a high-frequency alternating current (AC) is passed

3) Induction heater consists consists of an electromagnet, through which a directcurrent (DC) is passed

4) Induction heater consists consists of a resistor, through which a directcurrent (DC) is passed

Q.29 Null character needs a space of

1) Zero byte

2) Four bytes

3) One byte

4) Two bytes

Q.30In XY mode operation of dual trace CRO

1) in place of input signal time base signal is applied to VDPs

2) blanking pulse is applied at VDPs

3) in place of time base signal channel 2 signal is applied to HDPs

4) trigger pulse is applied to time base generator

Q.31 In displacement measurement using LVDT

1) direction of displacement is determined by the difference in the rms value ofthe secondary voltage and primary voltage

2) direction of displacement is determined by the phase of secondary voltagewith respect to phase of primary voltage

3) direction of displacement is determined by the phase difference between thetwo secondary voltages

4) direction of displacement is determined by the difference in the rms value ofthe two secondary voltages

Q.32

Page 16 of 37



17/37

The output frequency of a frequency division circuit that contains 4 flip-flops with aninput clock frequency of 20 MHz will be

1) 1.25MHz

2) 10MHz

3) 5MHz

4) 2.5MHz

Q.33 The minimum number of F/F required for designing a MOD-60 synchronous counter is

1) 7

2) 60

3) 8

4) 6

Q.34 For thermal stability of a transistor the value of stability factor S is very important. Thisstability factor S is given by

1) Ib/ Ico2) Ic/ Ico3) Ic/ Ie4) Ie/ Ico

Q.35 Micro wave communication is used in

1) Computers networks

2) Industries

3) TNEB

4) Telephone networks

Q.36 Write a Boolean expression for the logic diagram shown in below Figure

1) Y=((A.B) I.(B+C) I )I

2) Y=1

3) Y=A.C I+B 4) Y= C I.(A+B)+B.C

Q.37

In a colour TV primary colours are

1) Red, Green and black

2) Red, Grey and Blue

Page 17 of 37



18/37

3) Red , Grey and Black

4) Red, Green and Blue

Q.38 Resolution of a pulsed radar can be improved by

1) Increasing the pulse amplitude2) Decreasing pulse width

3) Increasing pulse repetition frequency

4) Increasing pulse width

Q.39 The phosphor numbers for monochrome and colour picture tubes are respectively

1) P1 and P22

2) P1 and P4

3) P4 and P1

4) P4 and P22

Q.40 Which of the following is the fastest switching device?

1) SCR

2) JFET

3) MOSFET

4) BJT

Q.41 As the height of a half-wavelength antenna is reduced below a quarter-wavelength, theradiation resistance

1) Becomes infinite

2) decreases

3) Remain the same

4) Becomes double

Q.42 Clock speed of a 8085 microprocessor is

1) 5 MHz

2) 10 MHz

3) 80 MHz

4) 3 MHz

Q.43

Which one of the following is not a valid rule of Boolean algebra?

1) A.A = A

Page 18 of 37



19/37

2) A+1=1

3) A = 4) A + 0 = A

Q.44 In C++ ,the standard input stream, which refers to the keyboard, is called1) stin

2) cin

3) stout

4) cout

Q.45 In order to add 11111111+11111101, we require

1) seven Full Adder and one Half Adder

2) One Full Adder, one HA

3) seven Full Adder

4) One Full Adder and seven Full Adder

Q.46 A 555 timer is working in monostable mode. The minimum voltage required fortriggering is

1) 3Vcc/4

2) 2Vcc/3

3) Vcc/3

4) 0 volts

Q.47 Contrast in a TV is controlled by

1) AC voltage in video signal

2) Stabilizer

3) DC voltage in video signal

4) Both AC and DC voltages in video signal

Q.48 A 1 mA ammeter has a resistance of 100 Ohms. It is converted to a 1 Amp ammeter.The value of shunt resistance is

1) 100000 Ohms

2) 0.001 Ohm

3) 100 Ohms

4) 0.1001 Ohm

Q.49

Page 19 of 37



20/37

MW links are generally preferred to coaxial cable to TV transmission because

1) They have less overall phase distortion

2) They are cheaper

3) Of their relative immunity to impulse noise

4) Of their greater bandwidth

Q.50 Pre- emphasis is used to

1) attenuate both high and low frequencies

2) amplify both high and low frequencies

3) Pre- emphasis is used to

4) amplify High frequencies

Q.51 If a television is turned on then only a vertical line is coming then

1) Vertical section is not working

2) Antenna is not connected

3) Low Power supply section is not working

4) Horizontal section is not working

Q.52 The latching current of a SCR

1) is less than holding current

2) decreases with increase in device current

3) is more than holding current4) is equal to holding current

Q.53 Which one of the following statements is correct?

1) The wavelength of a wave propagating in a wave guide is directlyproportional to the group velocity

2) The wavelength of a wave propagating in a wave guide is greater than thefree space wavelength

3) The wavelength of a wave propagating in a wave guide is smaller than thefree space wavelength

4) The wavelength of a wave propagating in a wave guide is inverselyproportional to the group velocity

Q.54 One 8bit SAR type ADC is working with 1MHz clock. The maximum conversion timeof the ADC will be approx

1) 2 microseconds

2) 8 microseconds

Page 20 of 37



21/37

3) 1000000 microseconds

4) 1 microsecond

Q.55 Which of the following forms of temperature sensor most nonlinear and produces alarge change in its resistance with temperature?

1) P-N Junction sensor

2) Bimetal strip temperature sensor

3) Thermistor

4) RTD

Q.56 Which of the following is an example of wireless telegraph

1) Mobile SMS

2) Landline

3) Telegram

4) Fax

Q.57 A multi range digital voltmeter has display of 3 and 1/2 digit . If it uses counter typeADC then maximum count of the counter will be

1) 1999

2) 1000

3) 350

4) 3500

Q.58 Instruction LHLD 2000H is an example of

1) Implied addressing

2) Indirect addressing

3) Register addressing

4) Direct addressing

Q.59 In C++ , which of the following formulas can be used to generate random integers

between 1 and 10?1) 1 + (10 - 1 + 1) % rand()

2) 1 + rand() % (10 - 1 + 1)

3) 10 + rand() % (10 - 1 + 1)

4) 10 + rand() % (10 + 1)

Q.60The Gray code for number 7 is

Page 21 of 37



22/37

1) 0100

2) 0110

3) 1001

4) 1100

Q.61 Which of the following is a group of passive devices only?

1) Resistor ,Capacitor, Inductor, FET

2) Resistor ,Capacitor, Inductor, Transistor

3) Diode Capacitor, Inductor, Transistor

4) Transformer, Resistor ,Capacitor, Inductor,

Q.62 FSK and PSK are

1) Frequency shift keying and pole shift keying

2) Frequency shift keyboard and phase shift keyboard

3) Frequency shift keying and phase shift keying

4) Frequency shift keyboard and pole shift keyboard

Q.63 Communication is a process of

1) Transfer of circuit

2) Transfer of information

3) Transfer of energy

4) Transfer of channel

Q.64 The resolution of a 8 bit DAC will be

1) 1/255

2) 1/8

3) 1/128

4) 1/64

Q.65MCB stands for

1) Min circuit board

2) Main circuit board

3) Major circuit breaker

4) Max circuit board

Q.66Which of the following diode is used as detector in radar?

Page 22 of 37



23/37

1) Schottky diode

2) IMPATT diode

3) Photo diode

4) Gunn diode

Q.67 In Three phase controlled rectifier

1) ripple frequency is less but ripple voltage is more compare to single phasecontrolled rectifiers

2) both ripple frequency and ripple voltage are less compare to single phasecontrolled rectifiers

3) ripple frequency is more but ripple voltage is less compare to single phasecontrolled rectifiers

4) both ripple frequency and ripple voltage are more compare to single phasecontrolled rectifiers

Q.68 In Frequency modulation

1) Carrier signal frequency varies with the amplitude of modulating signal

2) Carrier signal amplitude varies with the frequency of modulating signal

3) Carrier signal frequency varies with the frequency of modulating signal

4) Carrier signal amplitude varies with the amplitude of modulating signal

Q.69 Duty cycle of a multivibrator output is

1) T ON /TON +T OFF

2) T ON +TOFF / T ON

3) T ON +TOFF / T OFF

4) T OFF /TON +TOFF

Q.70 In AM ,Modulation index is given by the

1) Ratio of peak value of carrier signal to that of the modulating signal

2) Ratio of peak value of modulating signal to that of the carrier signal

3) Ratio of frequency of carrier signal to the peak value of modulating signal

4) Ratio of frequency of modulating signal to the peak value of carrier signal

Q.71If a diode is faulty then

1) It will show very high resistance in both direction

2) It will show low resistance in one direction and high resistance in other

Page 23 of 37



24/37

direction

3) It will show either very high or very low in both direction

4) It will show very low resistance in both direction

Q.72 In sign magnitude numbers

1) ms bit always 1

2) ms bit 0 stands for the positive numbers

3) ms bit 0 stands for the negative numbers

4) ms bit 1 stands for the positive numbers

Q.73 Which of the following statement is correct?

1) The frequency of carrier signal is very high compare to that of modulatingsignal

2) The frequency of carrier signal and modulating signal are equal3) The frequency of carrier signal is lower than that of modulating signal

4) The frequency of carrier signal depends on frequency of modulating signal

Q.74 The standard IF value for AM receiver is

1) 107KHz

2) 455MHz

3) 455 KHz

4) 10.7MHz

Q.75 Current distribution on a thin half-wave dipole antenna is closely approximated by a

1) sinusoidal wave

2) Square wave

3) Rectangular wave

4) Triangular wave

Q.76 In a P type semiconductor

1) No. of holes is more than No. of free electrons2) Electrons are the only charge carriers

3) Holes are the only charge carriers

4) No. of free Electrons is more than No. of holes

Q.77

The bandwidth required for baseband signals for FM radio is generally

Page 24 of 37



25/37

1) 0.3 KHz to 3 KHz

2) Up to 15KHz

3) Up to 150KHz

4) 0.5 to 1.5 KHz

Q.78 When a good quality capacitor is tested using an analog multimeter then defelection inthe pointer

1) Will be maximum

2) Will be initially maximum then gradually will move towards zero

3) Will be initially zero then gradually will move towards maximum

4) Will be zero

Q.79 ALE stands for

1) Accumulator logic execution

2) Arithmetic logic execution

3) Address latch enable

4) All enable

Q.80 Which of the following stage in a radio receiver provides the maximum image signalselectivity?

1) IF amplifier

2) Audio amplifier3) Frequency mixer

4) RF amplifier

Q.81 Communication satellites are invariably

1) Geostationary

2) Stationary

3) Changing their track and speed

4) Revolving at their own speed

Q.82 Gain of a radar transmitting antenna is

1) Less than that of radar receiving antenna

2) Much higher than that of radar receiving antenna

3) Slightly higher than that of radar receiving antenna

4) Almost equal to that of radar receiving antenna

Page 25 of 37



26/37

Q.83 Which of the following lighting system will consume minimum energy for giving sameamount of light

1) Filament bulb

2) LED

3) CFL

4) Florescent Tube

Q.84 MW signals follow the curvature of the earth. This is known as

1) Ducting

2) Ionospheric reflection

3) Faraday effect

4) Tropospheric scatter

Q.85 Which of the following statement is correct?1) P-Type transistors are preferred over N-type Transistors mobility because P

type transistors are easily biased

2) P-Type transistors are preferred over N-type Transistors because mobility ofholes is more than that of electrons

3) N-Type transistors are preferred over P-type Transistors because mobility ofelectrons is more than that of holes

4) N- Type transistors are preferred over P-type Transistors mobility because Ntype transistors are easily biased

Q.86 Which BJT biasing configuration has the highest bias stability

1) Fixed bias

2) Voltage divider bias with Emitter bias

3) Collector to base feedback bias

4) Emitter bias

Q.87 In asynchronous transmission, the gap time between bytes is _______.

1) variable

2) A function of data rate

3) zero

4) Fixed

Q.88

Maximum memory accessed by 8085 is

1) 64MB

Page 26 of 37



27/37

2) 64KB

3) 80MB

4) 85MB

Q.89 Which port of 8255 PPI is only used in BSR mode1) Port A

2) Port C

3) Port B

4) Port D

Q.90 Equilizing pulse in TV are applied during

1) Horizontal trace

2) Vertical blanking period

3) Horizontal blanking period

4) Horizontal retrace

Q.91 To achieve total internal reflection in optical fibre the refractive index of claddingmaterial is kept

1) Zero

2) Greater than that of core

3) Lower than that of core

4) Equal to core

Q.92 In a transistor tester the transitor under test works as

1) A differentiator

2) Switch

3) An oscillator

4) An integrater

Q.93 RS-232 cable stands for

1) Recommended standard cable for parallel I/O

2) Read and save 232 byte cable for parallel I/O

3) Receive and Send 232 byte cable for parallel I/O

4) Recommended standard cable for serial I/O

Q.94

Which of the following parameters is not specified for digital ICs?

Page 27 of 37



28/37

1) Propagation delay

2) Noise margin

3) Band-width

4) Gate dissipation

Q.95 If the frequency spectrum of a signal has a bandwidth of 500 Hz with the highestfrequency at 600 Hz, what should be the sampling rate, according to the Nyquisttheorem?

1) 1200 samples/s

2) 500 samples/s

3) 600 samples/s

4) 1000 samples/s

Q.96 A JFET has V p= -5V, I DSS =10 mA. For a drain current I D=6.4 mA, the value of sourceresistance R S will be

1) 506 Ohms

2) 156 Ohms

3) 1 K Ohms

4) 470 Ohms

Q.97 In a mobile charger is nothing but

1) A DAC with filters2) An ADC with filters

3) An Inverter with filters

4) A Rectifier with filters

Q.98 Which of the following is not a sequential circuit?

1) Bistable Multivibrator

2) EXOR GATE

3) SAR type ADC

4) counter

Q.99

Which of the following circuit is not used in a digital frequency meter?

1) Schmitt trigger

2) S/H

3) Counter

Page 28 of 37



29/37

4) oscillator

Q.100 Current gain in

1) Common emitter amplifier is more than common collector amplifier

2) Common base amplifier is more than common collector amplifier3) Common base amplifier is more than common emitter amplifier

4) Common collector amplifier is more than common emitter amplifier

Q.101 Which of the following device is used as an Optical detector ?

1) PIN photo diode

2) Laser diode

3) Transistor

4) LED

Q.102 With increase in modulation index

1) transmitted power increases in both FM and AM

2) transmitted power decreases in both FM and AM

3) transmitted power remain constant in FM but increases in AM

4) transmitted power remain constant in AM but increases in FM

Q.103 In Amplitude modulation

1) Carrier signal amplitude varies with the amplitude of modulating signal2) Carrier signal amplitude varies with the frequency of modulating signal

3) Carrier signal frequency varies with the frequency of modulating signal

4) Carrier signal frequency varies with the amplitude of modulating signal

Q.104 Program counter of a 8085 holds the address of

1) ALU for next operation

2) Flag register to be change after ALU operation

3) instruction to be executed to be executed next4) Temporary registers to be used next

Q.105In a telegraph system information is transmitted in the form of

1) Morse code.

2) BCD code.

3) HEX code.

Page 29 of 37



30/37

4) opcode.

Q.106 http stands for

1) Hyper text transfer procedure

2) High time transmission protocol3) Hyper text transfer protocol

4) Hyper text transmission procedure

Q.107 The screen size of a television is given by

1) Diagonal length of screen

2) Sum of Horizontal and Vertical length of screen

3) Vertical length of screen

4) Horizontal length of screen

Q.108 If the address of port A of 8255PPI is 40H then the control resister address will be

1) 80H

2) 48H

3) 39H

4) 43H

Q.109 Deflection of an electron beam on a CRT screen is 10 mm. Suppose pre-accelerating

anode voltage is halved and potential between deflection plates is doubled, thedeflection of the electron beam will be

1) 80 mm

2) 10 mm

3) 40 mm

4) 20 mm

Q.110 The maximum power in AM,when modulation index is

1) 0.5

2) 13) 0

4) 0.7

Q.111

For emitter-coupled logic, the switching speed is very high because

1) Negative logic, is used

Page 30 of 37



31/37

2) Multi-emitter transistors are used

3) The transistors are not saturated when conducting

4) Emitter-coupled transistors are used

Q.112 A lossless line of 50 ohms is terminated in a resistive load of 100 ohms then VSWRwill be

1) 4:1

2) 2:1

3) 3:4

4) 1:2.5

Q.113 Across RL load if Flywheel diode is used then

1) Average voltage across the load decreases

2) Average voltage across the load increases

3) Average voltage across the load remain unchanged

4) AC voltage across the load increases

Q.114 Blanking pulse is applied at_______ to blank the screen during_______

1) focusing anode, retrace

2) Grid Plate, retrace

3) grid plate, trace

4) HDP, retrace

Q.115 In 8051 microcontroller

1) 128 byte ROM is available but RAM is not available

2) 128 byte RAM is available but ROM is not available

3) RAM and ROM both available

4) 2Kbyte RAM is available and ROM is not available

Q.116 74AC32 IC is a

1) 2 input NAND gate

2) Triple 3 input NAD gate

3) Quad 2 input OR gate

4) Triple 3 input AND gate

Q.117

Strain gauge, LVDT and thermocouple are examples of

Page 31 of 37



32/37

1) Primary transducers

2) Passive transducers

3) Active transducers

4) Analog transducers

Q.118 A 3 and 1/2 digit display voltmeter having a resolution of 100 mV can be used tomeasure maximum voltage of

1) 5000V

2) 200V

3) 100V

4) 1000V

Q.119 The term RADAR stands for

1) Radio detection and ranging2) Radio waves dispatching and receiving

3) Radio direction and ranging

4) Radio deviation and recovery

Q.120 In a transistor tester when a transistor is tested and no sound is produced by the testerthen

1) Transistor is OK and is a high frequency transistor

2) Transistor is short

3) Transistor is OK and is a low frequency transistor

4) Transistor is open

Q.121 CMRR of a differential amplifier is given by

1) R i /Ro

2) A d /A c

3) R o /Ri

4) A v /A i

Q.122 Which statement is correct

1) HLDA signal generated by DMA controller for peripherals

2) HLDA signal is generated by 8085 for DMA controller

3) HLDA signal generated by DMA controller for 8085

4) HOLD signal is generated by 8085 for DMA controller

Page 32 of 37



33/37

Q.123 A TV transmitter antenna is fixed on top of a 150 meter tower located on a mountain of1200 metre height. The range of the transmitter is

1) 51 KM

2) 152 KM

3) 51M4) 152M

Q.124 AFC and AGC are respectively

1) Audio frequency control and automatic gain control

2) Audio frequency control and automatic gate control

3) Amplitude frequency control and automatic gain control

4) Automatic frequency control and automatic gain control

Q.125 In C++ the keyword used to transfer control from a function back to the callingfunction is

1) goback

2) goto

3) return

4) switch

Q.126 Which of the following instrument is used in aeroplane to measure its height aboveground?

1) MTI Radar

2) Doppler Radar

3) CW Radar

4) Radar Altimeter

Q.127 Which of the following transistors can be used in enhancement mode?

1) MOSFET

2) UJT

3) JFET

4) NPN transistor

Q.128

After taking 1s complement of a binary number if 1 is added then result is

1) Number becomes negative

2) The original number

Page 33 of 37



34/37

3) 9s complement of the original number

4) The true complement of the original number

Q.129 The ASCII is

1) a four bit input output code2) a two bit input output code

3) a seven bit input output code

4) an eight bit input output code

Q.130 A 0-300V voltmeter have an error of +/- 2% of full scale deflection. What will be therange of reading if true value is 30 V?

1) 294V-306V

2) 24V-36V

3) 20V-40V

4) 29.4V-30.6V

Q.131 Sky wave propagation is used in

1) Long distance transmission

2) Mobile transmission

3) Short distance transmission

4) Medium distance transmission

Q.132 Camera signal output without sync is called

1) Generator lock video

2) Composite video

3) Non composite video

4) Black burst

Q.133After the execution of the following program the content of accumulator will be

MVI A,45HDAAADI 45HDAAHLT

1) 00H

2) 8AH

Page 34 of 37



35/37

3) 45H

4) 90H

Q.134 A 64 K ROM chip will have

1) 8 data pins and 16 address pins2) 64 data pins and 8 address pins

3) 16 data pins and 8 address pins

4) 8 data pins and 8 address pins

Q.135 In a CRO , Trigger pulses are used

1) to synchronize the input signal with the time base generator

2) to synchronize the input signal with the vertical amplifier

3) to generate low voltages required for CRO

4) to generate high voltage required for CRT

Q.136 Which of the following circuits can be used as series to parallel converter?

1) Encoder

2) Decoder

3) De-multiplexer

4) multiplexer

Q.137 Before transmission message signal is modulated with carrier signal for1) decreasing the height of transmitting antenna

2) increasing the amplitude of message signal

3) decreasing the amplitude of message signal

4) increasing the height of transmitting antenna

Q.138 Which of the following statement is correct?

1) The internal resistance of a current source is very high but very low in avoltage source

2) The internal resistances of a current source and a voltage source are equal

3) The internal resistances of a current source and a voltage source are very high

4) The internal resistance of a current source is very low but very high in avoltage source

Q.139

A triangular wave shape is obtained

Page 35 of 37



36/37

1) By differentiating square wave

2) By differentiating a sine wave

3) By integrating a sine wave

4) By integrating a square wave

Q.140 The input impedance at the centre of a dipole antenna is approximately

1) 73 Ohms

2) 50 Ohms

3) 36.6 Ohms

4) 300 Ohms

Q.141 What is the typical anode voltage for a 25inch colour picture tube?

1) 30KV

2) 230V

3) 30V

4) 110V

Q.142 If a diode is reversed biased by a voltage 10 V, and its breakdown voltage is 50V then

1) Then current flowing through the diode due to majority carriers is very low

2) Then current flowing through the diode due to minority carriers is very high

3) Then current flowing through the diode due to minority carriers is very low

4) Then current flowing through the diode is zero

Q.143 Plumbicon operates on the principle of

1) Photo conduction

2) Photo emission

3) Seeback effect

4) Photo voltaic effect

Q.144 In a Microwave oven heating is done through the process of

1) Dielectric heating

2) Filament heating

3) Resistive heating

4) Induction heating

Q.145Unipolar, bipolar, and polar encoding are types of _______ encoding.

Page 36 of 37



37/37

Electronics 24jan2014(2)

Documents

Transcript of Electronics 24jan2014(2)