SSB Engineering Assistant Prasar Bharti 2013

STAFF SELECTION BOARD

ENGINEERING ASSISTANT AND TECHNICIAN IN PRASAR BHARATI

This booklet contains 200 questions in all comprising the following three parts:

Part (a) : General Intelligence and Reasoning            (50 Questions)

Part (b): General awareness                                         (50 Questions)

Part (C) : Technical Knowledge                                    (100 questions)

PART (C) : TECHNICAL KNOWLEDGE

1.     Cloudy nights are generally warmer than clear ones. Which one of the following could be the reasons ?

a)     Clouds have high thermal conductivity

b)     Clouds do not radiate heat

c)     Clouds have low thermal conductivity

d)     Clouds do not absorb heat

2.     If a mixture of 1.00 g each of H₂  and He exerts a total pressure of 0.48 atm, what is the ratio of the partial pressures of hydrogen to helium ?

a)     3

b)     0.5

c)     1

d)     2

3.     An electron travelling horizontally from north to south enters a region where a uniform electric fields is directed downward. What is the direction of the electric force exerted on the electron once it has entered the field ?

a)     To the west

b)     Downward

c)     Upward

d)     To the east

4.     If the electric field at a distance r away form charge Q is 36 N/C, what is the ratio of the electric fields at r, 2r and 3r ?

a)     36: 18:9

b)     36:9:4

c)     9:3:1

d)     36:18:12

5.     What is the linear distance between the sixth and eight maxima on the screen ? the wavelength z is 550 mn, the slits are separated by 0.14 mm, and the screen is 70 cm form the slits.

a)     2.75 mm

b)     55 mm

c)     5.5 mm

d)     5 mm

6.     A source of sound of frequency 400 Hz is placed inside water. If the velocities of sound in water and air are 1500 m/s and 330 m/s respectively, what is the frequency of sound received by an observer standing in air ?

a)     2000 Hz

b)     80 Hz

c)     400 Hz

d)     800 Hz

7.     If the average kinetic energy of oxygen molecule is ‘E; at 300 K, them that of hydrogen molecule at the same temperature is

a)     E/2

b)     E

c)     E/16

d)     E/8

8.     For molecules with a centre of symmetry, transitions that are allowed in the infrared are forbidden in Raman spectra and vice-versa. This rule is called as

a)     Rule of incoherence

b)     Rule of mutual exclusion

c)     Rule of inversion

d)     Pauli’s exclusion principle

9.     Transmission grating is used to determine

a)     Polarization of light

b)     Intensity of light

c)     Hyperfine structure

d)     Wavelength of light

10.  The reactance of a capacitance at 50 Hz is 5 ohms. What is the reactance at 200 Hz ?

a)     20 ohms

b)     2.0 ohms

c)     1.25 ohms

d)     12.5 ohms

11.  A stationary observer heard the frequency of whistling sound of a moving train as 420 Hz and 350 Hz when it moves towards and away form him respectively. If the velocity of sound is 300 m/s, then the speed of the train is

a)     75 m/s

b)     25 m/s

c)     50 m/s

d)     40 m/s

12.  If a metal rod of length ‘l’ and diameter ‘d’ is clamped at one end and twisted at the other end by applying a couple, then the couple per unit twist is directly proportional to

^a)         l^-2

^b)         l⁴

^c)         d²

^d)         d⁴

13.   If germanium is doped with boron and silicon is doped with indium, then

a)     They are p-type and n-type semiconductors respectively

b)     Both are p-type semiconductors

c)     Both are n-type semiconductors

d)     They are n-type and p-type semiconductors respectively

14.  Hydrogen bomb is a device which makes use of the principle of

a)     Nuclear fission

b)     Chemical reaction

c)     Nuclear fusion

d)     Nuclear reaction

15.  The grade of service is measured in

a)     Fractional number

b)     Logarithmic number

c)     Percentage

d)     Number

16.  Quantization noise occurs in

a)     PWD

b)     PCM

c)     TDM

d)     FDM

17.  Which of the following frequencies is likely to be associated with AM radio broadcast ?

a)     10 GHz

b)     1000 kHz

c)     100 MHz

d)     500 MHz

18.  Polarization of radio wave is determined by

a)     The gain of the antenna

b)     The directivity of the antenna

c)     The direction of the magnetic flux lines with respect to the surface of the earth

d)     The direction of the electric flux lines with respect of the surface of the earth.

19.  The amplitude of an audio signal is 10 and that of the carrier wave is 50. Percentage modulation is

a)     50

b)     0.2

c)     10

d)     20

20.  The VSB signal is produced from the DSB signal by employing

a)     High frequency modulation

b)     Simple filter

c)     Balanced modulator

d)     Ring modulator

21.  A parabolic antenna is commonly used at

a)     500 MHz

b)     50 Hz

c)     500 kHz

d)     50 MHz

22.  The dominant mode in a rectangular waveguide is

a)     TM₁₁

_b)         TE₀₁

_c)         TM₀₁

d)     TE₁₀

23.  Amplitude  limiter is not essential in the following detector :

a)     Ratio detector

b)     Foster – seeley discriminator

c)     Balanced slope discriminator

d)     Single slope detector

24.  Armstrong modulator generates

a)     PM

b)     AM

c)     SSB

d)     FM

25.  If the FM has modulation index large compared to one radian, that yields

a)     Phase deviation

b)     Narrow band FM

c)     Wide band FM

d)     Phase modulation

26.  Spectral density of white noise

a)     Varies with frequency and bandwidth

b)     Varies with frequency

c)     Is constant

d)     Varies with bandwidth

27.  Microwave signals transmitted towards the sky are

a)     Transmitted through the ionosphere

b)     Unable to reach the ionosphere

c)     Strongly reflected by the ionosphere

d)     Strongly absorbed by the ionosphere

28.  The device used as optical detector is

a)     LCD

b)     LED

c)     LASER

d)     PIN photodiode

29.  The frequency associated with short wave I (SW I) are

a)     25 to 34 MHz

b)     1.6 to 4.5 MHz

c)     4.5 to 16 MHz

d)     16 to 25 MHz

30.  Video transmission in TV broadcast is usually on

a)     SM

b)     AM

c)     FM

d)     PM

31.  Electric wire size is expressed in SWG. SWG stands for

a)     Standard Wire Gauge

b)     Short Wire Gauge

c)     Stranded Wire Gauge

d)     Sealed Wire Gauge

32.  In a current carrying conductor, Biot –savart law is used to determine

a)     S

b)     B

c)     H

d)     MMF

33.  The average value of sinusoidal voltage signal is given by

a)     0.0637 Vm

b)     0.318 Vm

c)     0.0318 Vm

d)     0.637 Vm

34.  For ceiling fans the single-phase motors generally used are

a)     Capacitor start and run type

b)     Resistor split phase type

c)     Permanent split capacitor type

d)     Capacitor start type

35.  If the iron core form the electromagnet is removed, then the inductance of the electromagnet will

a)     May increase or decrease

b)     Increase

c)     Decrease

d)     Remain the same

36.  Which of the following materials has negative temperature coefficient of resistance ?

a)     Carbon

b)     Copper

c)     Brass

d)     Lead

37.  The range of voltmeter and ammeter can be increase respectively by

a)     Connecting low value of series resistance and high value of shunt resistance

b)     Low value of parallel resistance and high value of series resistance

c)     High value of series resistance and low value of parallel resistance

d)     Using series capacitor and series inductor

38.  If the power gain of an amplifier is P, and the voltage gain is Q, the current gain will be

a)     PQ

b)     P+Q

c)     P/Q

d)     Q/P

39.  The number of comparators in a 4-bit flash ADC is

a)     16

b)     4

c)     5

d)     15

40.  A ring counter consisting of five flip-flop will have

a)     Infinite states

b)     5 states

c)     10 states

d)     32 states

41.  Many organizations with their offices in different countries of the world connect their computers through telecommunication satellites and telephone lies such a network is called

a)     ECONET

b)     LAN

c)     WAN

d)     ETHERNET

42.  Which is the command line prompt for TCP file transfer ?

a)     #

b)     C:>

c)     FTP>

d)     $

43.  Which of the following is not a semiconductor ?

a)     Diamond

b)     Germanium

c)     Silicon

d)     Gallium arsenide

44.  In a full wave rectifier, the current flows in each of the diodes for

a)     One-fourth cycle of the input signal

b)     The complete cycle of the input signal

c)     Less than half the cycle of the input signal

d)     Half-cycle of the input signal

45.  The negative feedback in an amplifier

a)     Decrease the bandwidth

b)     Increases voltage gain

c)     Does not affect the voltage gain

d)     Reduces voltage gain

46.  An astable mutivibrator is basically s

a)     Two stage RC coupled amplifier

b)     Two stage tuned amplifier

c)     RF amplifier with positive feedback

d)     RF amplifier with negative feedback

47.  The emitter of a transistor is very ______ and _______ doped.

a)     Thick, heavely

b)     Thin, lightly

c)     Thin,heavily

d)     Thick, lightly

48.  In amplifier application FET operates in the

a)     Zener breakdown region

b)     Controlled resistor regon

c)     Controlled source region

d)     Avalanche breakdown region

49.  Which property of a database transaction says the effect of concurrent execution of statement must be equivalent to serial execution ?

a)     Durability

b)     Atomicity

c)     Consistency

d)     isolation

50.  A disk crash is reported under

a)     Media failure

b)     User error

c)     Statement failure

d)     Instance failure

51.  Which of the following is used for serial access storage only

a)     CD

b)     RAM

c)     Magnetic tape

d)     Magnetic disk

52.  CPU’s processing power is measure in

a)     Nano seconds

b)     IPS

c)     CIPS

d)     NIPS

53.  A 24-bit operand permits as many as ______ addresses

a)     16000

b)     160000

c)     1600

d)     None of the above

54.  The section of code that accesses shared variables is called

a)     Procedure

b)     Critical section

c)     Block

d)     Semaphore

55.  Prepaging is the process of bringing the page to the memory

a)     Where locality of reference is not known

b)     At the time the page is referenced

c)     Before the page is referenced

d)     When page fault occurs

56.  Inodes, pid and uid are the ---- names of an entity.

a)     Entity

b)     Symbolic

c)     Logical

d)     Physical

57.  Identify the strategy which ahs the lowest storage cost and high locality of reference

a)     Selective replication

b)     Centralized

c)     Partitioned

d)     Complete replication

58.  Under which data allocation metrics is under –utilization of resources analyzed ?

a)     Communication cost

b)     Locality of reference

c)     Performance

d)     Storage cost

59.  The operands for a statement can be a

a)     Keyword

b)     Comment

c)     Constant

d)     Mnemonic

60.  Which kind of instruction is used by the compilers and assemblers to align coder ?

a)     There operand instruction

b)     No operand instruction

c)     One operand instruction

d)     Two operand instruction

61.  Which buffering methodology suffers form ‘Head of line’ problem ?

a)     Input-output buffering

b)     Input buffering

c)     Output buffering

d)     Central buffering

62.  How is a variable accessed form another file?

a)     The global variable is referenced via the extern specifier

b)     The global variable is referenced via the auto specifier

c)     The global variable is referenced via the pointer specifier

d)     The global variable is reference via the ext specifier

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