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Answer key Directorate of Shipping Services Andamans (Electronic & Communication)
1.From the given alternative words, select the word which cannot be formed using
the letters of the given word: Given: IMPASSIONABLE
(A)IMPASSABLE
(B)IMPOSSIBLE
(C)IMPASSIVE
(D)IMPASSION
Answer: (C) IMPASSIVE
2.BDAC : FHEG : : NPMO : ?
(A)RQTS
(B)NTRC
(C)TRQS
(D)RTQS
Answer: (D) RTQS
3.What is the pH value of the human body?
(A)9.2 to 9.8
(B)7.0 to 7.8
(C)6.1 to 6.3
(D)5.4 to 5.6
Answer: (B) 7.0 to 7.8
4.Writer : Pen : : ?
(A)Needle : Tailor
(B)Artist : Brush
(C)Painter : Canvas
(D)Teacher : Class
Answer: (C) Painter : Canvas
5.NUMERAL : UEALRMN : : ALGEBRA : ?
(A)LRBAGEA
(B)BARLAGE
(C)LERAGBA
(D)LERABGA
Answer: (D) LERABGA
6. FGID : OPQR : : BCDE : ?
(A)KLMJ
(B)KLMN
(C)IUVW
(D)STUW
Answer: (B) KLMN
7. Ashok’s mother was 3 times as old Ashok 5 years ago. After 5 years she will be
twice as old as Ashok. How old is Ashok today?
(A)10 years
(B)15 years
(C)20 years
(D)25 years
Answer: (B) 15 years
8.
Which one of the following is not a prime number?
(A)31
(B)61
(C)71
(D)91
Answer: (D) 91
9.How many 3-digit numbers are completely divisible 6 ?
(A)149
(B)150
(C)151
(D)166
Answer: (B) 150
10.If the number 5 * 2 is divisible by 6, then * = ?
(A)2
(B)3
(C)6
(D)7
Answer: (A) 2
11.Two goods train each 500 m long, are running in opposite directions on parallel
tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken
by the slower train to pass the driver of the faster one.
(A)12 sec
(B)24 sec
(C)48 sec
(D)60 sec
Answer: (B) 24 sec
12. A, B and C jointly thought of engaging themselves in a business venture. It was
agreed that A would invest Rs. 6500 for 6 months, B, Rs. 8400 for 5 months and
C, Rs. 10,000 for 3 months. A wants to be the working member for which, he was
to receive 5% of the profits. The profit earned was Rs. 7400. Calculate the share
of B in the profit.
(A)Rs. 1900
(B)Rs. 2660
(C)Rs. 2800
(D)Rs. 2840
Answer: (B) Rs. 2660
13. A train moving at 50 km/hr crosses a bridge in 45 seconds. The length of train is150 meters. Find the length of the bridge.
(A)525 m
(B)545 m
(C)575 m
(D)500 m
Answer: (C) 575 m
14.Two trains are running in opposite directions with the same speed. If the length
of each train is 120 meters and they cross each other in 12 seconds, then the speed
of each train (in km/hr) is:
(A)10
(B)18
(C)36
(D)72
Answer: (C) 36
15. “Identify the segment in the sentence which contains a grammatical error.
The man played the flute and led all the mouse out of the town.”
(A)all the mouse
(B)the flute and led
(C)out of the town
(D)The man played
Answer: (A) all the mouse
16.Choose the correctly spelt word.
(A)Maneouvrable
(B)Manoeuvrrable
(C)Manoeuvrable
(D)Manouverable
Answer: (C) Manoeuvrable
17. “In the following sentence a word of phrase is written in bold. For each bold part
four word/phrases are listed below each sentence. Choose the word nearest in
meaning to bold part.
He is a good looking but insipid young man.”
(A) arrogant
(B) unscrupulous
(C) sick
(D) lacking in spirit
Answer: (D) lacking in spirit.
18. “Select the most appropriate option to improve the underlined segment in the
given sentence. If there is no need to improve it, select ‘No improvement’.
The place was not cold only and also damp.”
(A) No improvement
(B) only cold not also
(C) not only cold but also
(D) not only cold and both
Answer: (C) not only cold but also
19. “Select the correct direct form of the given sentence.
Saaransh said he had solved the crossword the previous day.”
(A)Saaransh said, “I solved the crossword yesterday.”
(B)Saaransh said, “He have solved the crossword yesterday.”
(C)Saaransh said, “I have solved the crossword the previous day.”
(D)Saaransh said, “He has solved the crossword the previous day.”
Answer: (A) Saaransh said, “I solved the crossword yesterday.”
20. These medicines are _ for curing cold.
(A)Proper
(B) Real
(C)Effective
(D)Capable
Answer: (C) Effective
21. Anita me of a girl I used to know.
(A)remembers
(B) recalls
(C) recollects
(D) reminds
Answer: (D) reminds
22. Select the synonym of carnal
(A)spiritual
(B)sensual
(C)decent
(D)chaste
Answer: (B) sensual
23. The RBI has decided new Business timing for RTGS. What are the new timings?
(A) 6:00 AM- 6.30 PM
(B)6:30 AM- 5.00 PM
(C) 7:00 AM – 6.00 PM
(D)7:30 AM – 6.00 PM
Answer: (C) 7:00 AM – 6.00 PM
24. Which state has decided to recruit women drivers for government vehicles?
(A) Kerala
(B) Tamil Nadu
(C) Andhra Pradesh
(D) Telangana
Answer: (A) Kerala
25.The National War Memorial in Delhi was inaugurated on
(A) 24th February, 2019
(B) 25th February, 2019
(C) 26th February, 2019
(D) 28th February, 2019
Answer: (B) 25th February, 2019
26.Who becomes the youngest player to takes a hat-trick in IPL cricket history?
(A) Jasprit Bumrah
(B) Sam Curran
(C) Rashid Khan
(D) S Gopal
Answer: (B) Sam Curran
27. A syndicated loan is a loan that is ?
(A)Secured by Mortgages
(B)Unsecured
(C)Provided by Group of Banks
(D)Provided to a Group of Customers
Answer:(C) Provided by Group of Banks
28. What is the theme of World Photography Day 2023?
(A)Landscapes
(B)Dedicated to History
(C)Understanding Clouds
(D) BeNice
Answer: (A) Landscapes
29.The green planet in the solar system is?
(A) Mars
(B)Uranus
(C)Venus
(D) Earth
Answer: (B) Uranus
30.Right to emergency medical aid is a
(A)Legal Right
(B)Illegal Right
(C)Constitutional Right
(D)Fundamental Right.
Answer: (D) Fundamental Right.
31. Which of the following is a part of SMPS component?
(A)Output filter coil
(B)MOSFET
(C)Zener Diode
(D) FET
Answer: (A) Output filter coil
32. Automatic switching OFF function is accomplished in MCB by________________
(A)Relay
(B)Clutch
(C)Bimetallic-strip
(D)Diode
Answer: (C) Bimetallic-strip
33.Which of these is a correct definition of electronic current?
(A)Current that flows from lower potential to higher potential
(B)The current which remains static
(C)Current constituted by the flow of ions
(D)Current that flows from higher potential to lower potential
Answer: (A) Current that flows from lower potential to higher potential
34. The circuit design of switching regulated power supplies is __
(A)Complex
(B)Moderately complex
(C)Simple
(D)Not possible
Answer: (A) Complex.
35. The load regulation of switching regulated DC power supply is from.
(A) 0.05% – 0.5%
(B) 5% -15%
(C) 25% – 35%
(D) 1.5% – 2.5%
Answer: (A) 0.05% – 0.5%
36.The efficiency of switching regulated DC power supply is ____________
(A)1-20%
(B)70-85%
(C)10-85%
(D)10-20%
Answer: (B) 70-85%
37. A Zener voltage regulator is used for _______load currents
(A) High
(B) Very High
(C) Moderate
(D) Small
Answer: (D) Small
38.Where square wave inverters are used?
(A) Computers
(B) TV receiver
(C) DVD Players
(D) General lighting
Answer: (D) General lighting
39. How the backup time of UPS can be increased?
(A) Increase the VA rating of UPS
(B) Increase the AH capacity of battery
(C) Decrease the AH capacity of battery
(D)Maintain battery terminal voltage always 90% of rating
Answer: (B) Increase the AH capacity of battery
40.Which term refers that the mass of a substance liberated from an electrolyte by
one coloumb of electricity?
(A) Electrolysis
(B) Electro plating
(C) Electro copying
(D) Electro chemical equivalent
Answer: (D) Electro chemical equivalent
41. The transmitter-receiver combination in the satellite is known as a _
(A) Relay
(B) Repeater
(C) Transponder
(D) Duplexer
Answer: (C)Transponder
42. Why are VHF, UHF, and microwave signals used in satellite communication?
(A) More bandwidth
(B) More spectrum space
(C) Are not diffracted by the ionosphere
(D) Economically viable
Answer: (C) Are not diffracted by the ionosphere
43. Which of the following is not a common use for radio waves in the VHF band?
(A) FM radio broadcasting
(B) Walkie-talkie communication
(C) Marine communications
(D) Television broadcasting
Answer: (B) Walkie-talkie communication
44. What is the full form of SSB modulation?
(A) Shaky-sideband modulation
(B) Separated-sideband modulation
(C) Sorted-sideband modulation
(D) Singe-sideband modulation
Answer: (D) Singe-sideband modulation
45. The radar in which both transmission and reception is done using the same
antenna are called:
(A) Monostatic radar
(B) Bistatic radar
(C) Monopole radar
(D) Dipole radar
Answer: (A) Monostatic radar
46. Pulse radar operating at 10GHz frequency has an antenna with a gain of 28 dB
and a transmitted power of 2kW. If it is desired to detect a target of cross section
12m, and the minimum detectable
signal is -90 dBm, the maximum range of the radar is:
(A) 8114 m
(B) 2348 m
(C) 1256 m
(D) 4563 m
Answer: (A) 8114 m
47. “GPS Accuracy” Which among the following is more accurate in its output?
(A) Absolute positioning
(B) Resection method
(C) Modern GPS surveying
(D) Conventional GPS method
Answer: (D) Conventional GPS method
48. Which of the following indicates the correct set of classification for absolute
positioning?
(A) Carrier wave, pseudo range
(B) Pseudo range, SPS
(C) SPS, carrier wave
(D) Absolute positioning, SPS
Answer: (A) Carrier wave, pseudo range
49. Which among the following can act as a cause wrong GPS tracking?
(A) Refraction of signal
(B) Strength of signal
(C) Atomic clock
(D) Reflection of satellite signals
Answer: (D) Reflection of satellite signals
50. The accuracy speed of the GPS depends on __
(A) Reflection of signal
(B) Signal blockage
(C) Refraction of signal
(D) Position of satellite
Answer: (B) Signal blockage
51. What is Artificial Intelligence?
(A) Artificial Intelligence is a field that aims to make humans more intelligent
(B) Artificial Intelligence is a field that aims to improve the security
(C) Artificial Intelligence is a field that aims to develop intelligent machines
(D) Artificial Intelligence is a field that aims to mine the data
Answer: (C) Artificial Intelligence is a field that aims to develop intelligent
machines
52. Who is the inventor of Artificial Intelligence?
(A) Geoffrey Hinton
(B) Andrew Ng
(C) John McCarthy
(D) Jurgen Schmidhuber
Answer: (C) John McCarthy
53. Digital multimeter is used for
(A) measuring AC and DC current, voltage and resistance
(B) measuring AC current and voltage
(C) measuring DC current and resistance
(D) measuring AC voltage and resistance
Answer: (A) measuring (AC) and (DC) current, voltage and resistance
54. Multimeter can be used as an ammeter by
(A) connecting series resistances
(B) making use of a transducer
(C) making use of a transformer
(D) connecting shunts
Answer: (D) connecting shunts
55. An LCR meter is used to measure .
(A) current
(B) power
(C) inductance
(D) Voltage
Answer: (C) inductance
56. Oscilloscope is ________
(A) a ohmmeter
(B) an ammeter
(C) a voltmeter
(D) a multimeter
Answer:(C) a voltmeter
57. How many pressure and current coil is present in Megger?
(A) Two pressure coils and one current coil
(B) Two pressure coils and two current coils
(C) One pressure coil and one current coil
(D) One pressure coil and two current coils
Answer:(A) Two pressure coils and one current coil
58. An induction type voltmeter are categorized into types?
(A) Two
(B)Three
(C)Four
(D) Five
Answer: (A) Two
59. An ammeter is a
(A) Secondary instrument
(B) Absolute instrument
(C) Recording instrument
(D) Integrating instrument
Answer: (A) Secondary instrument
60. In an ammeter the shunt resistance usually meter resistance
(A) Equal to
(B) Less than
(C) Greater than
(D) Of any value
Answer: (B) Less than
61. Which of the following device can be used for measurement of frequency?
(A) Voltmeter
(B) Ammeter
(C) Stroboscope
(D) Barometer
Answer: (C) Stroboscope
62. A power factor meter has …….. control springs
(A) One
(B) Two
(C) Four
(D) No
Answer: (D) No
63. Which of the following method of measurement does a bridge circuit uses?
(A) relative
(B) comparison
(C) absolute
(D) differential
Answer: (B) comparison
64. Identify the type of modulation where the frequency of the modulated wave is
equal to that of the carrier wave.
(A) Frequency modulation
(B) Amplitude modulation
(C) Carrier modulation
(D) Phase modulation
Answer: (B) Amplitude modulation
65. Of the following which is the preferred modulation scheme for digital
communication?
(A) Pulse code modulation
(B) Pulse amplitude modulation
(C) Pulse position modulation
(D) Pulse width modulation
Answer: (A) Pulse code modulation
66. Which modulator is used for the generation of the DSB-SC signal?
(A) Balanced modulator
(B) Square law modulator
(C) Armstrong phase modulator
(D) Envelope detector
Answer: (A) Balanced modulator
67. Which of the following requires the least bandwidth?
(A) DSB SC
(B) DSB
(C) VSB
(D) SSB
Answer: (D) SSB
68. Which of the following stage is present in FM receiver but not in AM receiver?
(A) Amplitude limiter
(B) Demodulator
(C) AM amplifier
(D) Mixer
Answer: (A) Amplitude limiter
69. Baseband compression produces _
(A) a small range of frequencies from low to high
(B) a small range of different phases
(C) a small range of angles
(D) a small range of amplitude
Answer: (D) a small range of amplitude
70. Which of the following is not an advantage of digital modulation?
(A) Greater noise immunity
(B) Greater security
(C) Easier multiplexing
(D) Less bandwidth requirement
Answer: (D) Less bandwidth requirement
71. Which has same probability of error?
(A) BPSK and QPSK
(B) BPSK and ASK
(C) BPSK and PAM
(D) BPSK and QAM
Answer: (C) BPSK and PAM
72. Which of the following modulation schemes gives the maximum probability of
error?
(A) DBPSK
(B) PSK
(C) BFSK
(D) ASK
Answer: (D) ASK
73. is a type of digital modulation.
(A) Amplitude modulation
(B) Frequency modulation
(C) Phase modulation
(D) Frequency shift keying
Answer: (D) Frequency shift keying
74. A video camera generates data at a rate of 5 Mbps. The data is channel coded at
rate 1/3 and 8 PSK modulate(D) Which of the following statements is correct?
(A) Information rate: 15 Mbps; Symbol rate: 5 Msps
(B) Information rate: 5 Mbps; Symbol rate: 15 Msps
(C) Information rate: 15 Mbps; Symbol rate: 15 Msps
(D) Information rate: 5 Mbps; Symbol rate: 5 Msps
Answer: (A) Information rate: 15 Mbps; Symbol rate: 5 Msps
75. Which of the following is not true about VHF propagation?
(A) Can penetrate building walls
(B) Can travel long distances
(C) Transmitting antennas are huge
(D) Can be received indoors
Answer: (C) Transmitting antennas are huge
76. Standard AM broadcast stations usually use what type of transmitting antenna
(A) Log periodic
(B) Driven collinear array
(C) Marconi array
(D) Yagi-Uda
Answer: (C) Marconi array
77. Which array uses two half-wave dipoles spaced along with one-half wavelength
apart?
(A) Broad-end array
(B) End- fire array
(C) Back-fire array
(D) Binomial array
Answer: (B) End- fire array
78. Which among the following are the advantages of the Yagi antenna?
i. It has a gain that allows lower strength
ii. The antenna becomes strong for high gain levels
iii. It can be easily mounted
iv. It is mechanically relatively straight forward
(A) i, iii, and iv
(B) i, ii, and iv
(C) ii, iii, and iv
(D)Only ii
Answer: (A) i, iii, and iv
79. Most radar antenna use a
(A) Dipole
(B) Broadside array
(C) Horn and parabolic reflector
(D)Collinear array
Answer: (C) Horn and parabolic reflector
80. The discone antenna is
(A) A useful direction-finding antenna
(B) Used as a radar receiving antenna
(C) Circularly polarized like other circular antennas
(D) Useful as VHF receiving antenna
Answer: (D) Useful as VHF receiving antenna
81. Which type of antenna is used for the transmission of microwave of 4 GHz to 20
GHz
(A) Dish antenna
(B) Parabolic dish antenna (PD(A)
(C) Yagi antenna
(D) Marconi antenna
Answer: (B) Parabolic dish antenna (PD(A)
82. In radio transmission, what does the term ‘attenuation’ refer to?
(A) The increase in signal strength over a distance
(B) The distortion of the signal over a distance
(C) The decrease in signal strength over a distance
(D) The stability of the signal over a distance
Answer: (C) The decrease in signal strength over a distance
83. What is a common use of a Band Pass Filter in Radio Engineering?
(A) It allows all frequencies to pass through
(B) It allows only a specific range of frequencies to pass through
(C) It blocks all frequencies from passing through
(D) It amplifies all frequencies equally
Answer: (B) It allows only a specific range of frequencies to pass through
84. What is the function of a modem?
(A) Encryption and Decryption
(B) Converts data to voice and vice-versa
(C) Convert analog signals to digital and vice-versa
(D) Serves as a hardware anti-virus
Answer: (C) Convert analog signals to digital and vice-versa
85. RADAR is an ____ sensor?
(A) Electro-magnetic
(B) Electric
(C) Magnetic
(D) Static
Answer: (A) Electro-magnetic
86. Echoes are observed from _ in Radars?
(A) Targets
(B) Antennas
(C) Repeaters
(D) Systems
Answer: (A)Targets
87. Radars are _ devices?
(A) Active Sensing
(B) Passive Sensing
(C) Static Sensing
(D) Dynamic Sensing
Answer: (A) Active Sensing
88. What should be placed at the initial receiver’s stage?
(A) Voltage Regulator
(B) Current Regulator
(C) Transistor Amplifier
(D) Multiplexer
Answer: (C) Transistor Amplifier
89. What frequency determines the signal transmitted by the Radar?
(A) Pulse Reallocation
(B) Pulse Retrieving
(C) Pulse Repetition Frequency
(D) Post Reallocation Frequency
Answer: (C) Pulse Repetition Frequency
90.Unwanted component in the signal received at the Radars receiver is ?
(A) Receiver Noise
(B) Transmitter Noise
(C) Threshold Noise
(D) Noise Power
Answer: (A) Receiver Noise
91.How many types does a pulse radar have?
(A)Four
(B)Three
(C)Two
(D)One
Answer: (C) Two
92.What principle is used in MTI Radar?
(A) Flemming Effect
(B) Doppler Effect
(C) Hall Effect
(D) Thevenin’s Effect
Answer: (B) Doppler Effect
93. What is utilized to detect targets that are non-stationary?
(A) Basic Pulse Radar
(B) Moving Target Indication Radar
(C) Symmetric Radar
(D) Discontinuous Wave Radar
Answer: (B) Moving Target Indication Radar
94. Echo signal in FMCW radar is received by ?
(A) Transmitting Antenna
(B)Oscillator
(C) Receiving Antenna
(D)Duplexer
Answer: (C) Receiving Antenna
95. The ability of an antenna to focus its radiated power in a certain direction is
measured by which of the following property of the antenna?
(A) Directivity
(B) Impedance matching
(C) Resonance
(D) Antenna gain
Answer: (A) Directivity
96. A short monopole antenna is a type of?
(A) A short monopole antenna is a type of resonating antenna that consists of many
conducting elements
(B) A short monopole antenna is a type of harmonic antenna that consists of two
conducting elements
(C) A short monopole antenna is a type of horizontal antenna that consists of a
conducting element
(D) A short monopole antenna is a type of vertical antenna that consists of a
conducting element
Answer: (D) A short monopole antenna is a type of vertical antenna that consists
of a conducting element.
97. Name the region around an antenna where the electromagnetic waves it emits
behave consistently and predictably?
(A) Near field region
(B) Far-field region
(C) Intensity field
(D) Radiation field
Answer: (B) Far-field region
98. Which of the following type of antenna has a directivity of 0 dB?
(A) Horn antenna
(B) General antenna
(C) Patch antenna
(D) Isotropic antenna
Answer: (D) Isotropic antenna
99. Which of the following formula is used to calculate the bandwidth of an antenna?
(A) Bandwidth= Higher frequency* lower frequency
(B) Bandwidth= Higher frequency+ lower frequency
(C) Bandwidth= Higher frequency/ lower frequency
(D) Bandwidth= Higher frequency- lower frequency
Answer: (D) Bandwidth= Higher frequency- lower frequency
100._____________________ refers to the frequency where an antenna exhibits its maximum efficacy and
radiation performance.
(A)Quality factor
(B)Fractional bandwidth
(C)Resonant frequency
(D)Cut off frequency
Answer: (C) Resonant frequency
