CÂU HỎI TRẮC NGHIỆM CHUYÊN MÔN CHO SỸ QUAN QUẢN LÝ 10

No > The magnitude of a star is a measure of its A absolute brightness B relative brightness C diameter D semi-diameter No > The true zenith distance of the Sun when on the observer's meridian bearing North is 46° 23.9' and the declination is 9° 15'.0 S Calculate the observer's latitude A 37° 08.9' N B 37° 08.9' S C 55° 38.9' S D 64° 23.2' S No > The true zenith distance of the Sun when on the observer's meridian bearing South is 54° and the declination is 4° S Calculate the observer's latitude A 50° N B 58° N C 50° S D 58° S Page of 583 No > Given that the True Zenith Distance is 36° 22.0' and that the Calculated Zenith Distance is 36° 24.8', find and name the intercept, with respect to the direction of the observed body A 2.8' Away B 4.0' Away C 2.8' Towards D 4.0' Towards No > Which one of the following errors of the sextant would you be unable to adjust or minimise? A Perpendicularity B Centering C Side D Index No The earth is said to be in "aphelion" on approximately A 1st January B 21st January C 21st June > D 4th July Page of 583 No From those listed, how can the index error be detected in a marine sextant? A B > Clamp the index somewhere on the arc; hold the sextant horizontally with the arc away and look at the arc and its reflection in the index glass Clamp the index at zero; hold the sextant horizontally and observe true and reflected horizon through the telescope C Clamp the index at zero; hold the sextant vertically and observe true and reflected image of a star through the telescope D Clamp the index somewhere on the arc; hold the sextant vertically and observe the sun (using shades) through the telescope No > The true zenith distance of the Sun when on the observer's meridian bearing North is 6° 57.4' and the declination is 21° 28'.4 S Calculate the observer's latitude A 28° 25.8' N B 14° 31.0' N C 28° 25.8' S D 14° 31.0' S No > A first observation of the Sun was taken at 0815 Local Time If the vessel is steaming at 14 knots, how far should the position line be moved along the couse made good to find the position at 1200? A 48.3 miles B 49 miles C 52.5 miles D 56 miles Page of 583 No 10 Stars tabulated in the nautical almanac which have a negative magnitude (e.g.-1.4) > A should only be used for navigation in exceptional circumstances B are only visible in the southern hemisphere C are very bright D are only visible with the aid of the sextant telescope No 11 The earth rotates around the sun approximately every > A 360 days B 365 days C 366 days D 367 days No 12 A position line drawn in the direction 045°/225° could correspond to an azimuth of the observed body of > A 155° True B 045° True C 315° True D 325° True Page of 583 No 13 The true zenith distance of the Sun when on the observer's meridian bearing South is 6° 57.4' and the declination is 14° 36'.2 S Calculate the observer's latitude > A 21° 33.6' N B 07° 38.8' S C 07° 38.8' N D 21° 33.6' S No 14 The times of civil twilight are tabulated in the Nautical Almanac These times are > A the LMT when the sun's centre reaches 12° below the visible horizon before sunrise and after sunset B the LMT when the sun's centre reaches 6° below the visible horizon before sunrise and after sunset C the LAT when the sun's centre reaches 12° below the visible horizon before sunrise and after sunset D the LAT when the sun's centre reaches 6° below the visible horizon before sunrise and after sunset No 15 Sidereal hour angle is defined as the angular distance of an hour circle > A west of the First Point of Aries B west of the observer's meridian C west of the prime (Greenwich) meridian D east of a reference hour circle Page of 583 No 16 Which one of the following errors of the sextant would you attempt to remove? A Centering error B Shade error C Prismatic error > D Perpendicularity No 17 A position line drawn in the direction 070°/250° could correspond to an azimuth of the observed body of A 050° True B 070° True C 250° True > D 160° True No 18 If a ship is in 150°E longitude and the equation of time is +6 minutes, what is the GMT of noon at the ship? > A O154 B O206 C 2154 D 2206 Page of 583 No 19 The summer solstice in the northern hemisphere is approximately on > A 1st June B 21st June C 1st July D 21st July No 20 Given that the true altitude is 57° 24.9' calculate the True Zenith Distance > A 46° 20.2' B 57° 24.9' C 32° 35.1' D 55° 53.6' No 21 The index error of a marine sextant read as 35° 25'.3 is known to be 2' off the arc Find the observed altitude > A 35° 25.3' B 35° 27.3' C 35° 23.3' D 35° 29.3' Page of 583 No 22 If a star has a northerly declination and the observer is in north latitude, which of the statements listed is true? > A The star will be above the horizon for more than 12 hours B The star must be circumpolar C The star will be above the horizon for less than 12 hours D The bearing of the star must be south when on the meridian No 23 A first observation of the Sun was taken at 0815 Local Time If the vessel is steaming at 12 knots, how far should the position line be moved along the couse made good to find the position at 1200 > A 45 miles B 36 miles C 48 miles D 42 miles No 24 If a ship is in 90°E longitude and the equation of time is -4 minutes, what is the GMT of noon at the ship? > A O556 B O604 C 1756 D 1804 Page of 583 No 25 Given that the True Zenith Distance is 64° 44.0' and that the Calculated Zenith Distance is 64° 53.0', find and name the intercept, with respect to the direction of the observed body A 9.0' Away B 11.0' Away C 2.8' Towards > D 9.0' Towards No 26 Which error exists when the axis of the telescope of a sextant is not parallel to the plane of the instrument? > A Collimation B Side C Prismatic D Parallelism No 27 The times of sunrise and sunset are tabulated in the Nautical Almanac These times are > A the LMT when the upper limb is on the visible horizon for an observer at sea level B the LAT when the upper limb is on the visible horizon for an observer at sea level C the LMT when the lower limb is on the visible horizon for an observer at sea level D the LAT when the lower limb is on the visible horizon for an observer at sea level Page of 583 No 28 Given that the True Zenith Distance is 17° 44.0' and that the Calculated Zenith Distance is 17° 46.0', find and name the intercept, with respect to the direction of the observed body > A 2.0' Away B 4.0' Away C 2.0' Towards D 4.0' Towards No 29 Which of the statements listed about the first point of Aries is true? > A It is a fixed point in space B It moves slowly westwards C It moves slowly eastwards D It rotates on the celestial sphere once each year No 30 The declination of a celestial body is the > A angle, measured at the centre of the earth, between the observer and the body B angle, measured at the centre of the earth, between the body and the ecliptic C arc of the celestial meridian between the equinoctial and the parallel of declination passing through the body D arc of the celestial meridian between the ecliptic and the parallel of declination passing through the body Page 10 of 583 No 958 Radar does not transmit continuously because it would > A prevent detection of targets B cause interference to other vessels C reduce the life of components D make the equipment get very hot No 959 A typical pulse repetition frequency is A 3000 to 6000 pulses per second B 6000 to 8500 pulses per second C 100 to 500 pulses per second > D 500 to 3000 pulses per second No 960 Target ranges are obtained from A the pulse repetition frequency Bthe heading marker D the bearing marker Page 320 of 583 No 961 Target echoes appear along a line called the > A timebase B scanner C centre line D heading marker No 962 To provide accurate target bearings the radar beam must be > A wide in the horizontal plane B narrow in the horizontal plane C narrow in the vertical plane D wide in the vertical plane No 963 Accurate target bearings are obtained by > A making the radar beam wide vertically B synchronizing the radar beam and the trace C making the radar beam wide horizontally D rotating the trace intermittently Page 321 of 583 No 964 A complete oscillation of a radio wave is called A the frequency B the amplitude C the wavelength > D a cycle No 965 The horizontal distance between the adjacent crests of a radio wave is called > A the amplitude B the wavelength C a cycle D the frequency No 966 Half the vertical distance between the crest and the trough of a radio wave is called > A the amplitude B a cycle C the wavelength D the frequency Page 322 of 583 No 967 The number of cycles of a radio wave which pass a fixed point in a given time is called the > A speed B amplitude C frequency D wavelength No 968 A radar with a wavelength of 3.2 cm would have a frequency of about > A 6,060 MHz B 12,450 MHz C 9,375 MHz D 3,245 MHz No 969 S-band radar has a wavelength of > A 3.1 to 3.2 cm B 9.2 to 10 cm C 5.0 to 5.4 cm D 12.5 to 12.9 cm Page 323 of 583 No 970 Marine radar wavelengths are measured in > A microseconds B feet per second C centimetres D megahertz No 971 Most commonly, ships' radars operate in the > A S- band B L- band C X- band D Q- band No 972 The main component of the transmitter is the > A antenna B power supply C magnetron D cathode ray tube Page 324 of 583 No 973 The transmitter P.R.F is determined by the > A trigger unit B modulator C magnetron D delay line No 974 In addition to initiating the action of the transmitter, the trigger unit also sends a pulse to the: > A scanner to start scanner rotation B display to start the timebase C waveguide to open the T.R cell D receiver to start the local oscillator No 975 The transmitted pulse length is determined by the action of the > A magnetron B trigger unit C modulator D delay line Page 325 of 583 No 976 The transmitted frequency is determined by the design of the > A magnetron B T/R cell C scanner D waveguide No 977 The magnetron sends the R.F pulses to the > A display unit B transmitter unit C scanner unit D receiver unit No 978 The unit which sends returning target echoes to the receiver is the > A scanner unit B power supply unit C transmitter unit D display unit Page 326 of 583 No 979 The function of the waveguide is to > A block the transmitter during reception B generate the R.F pulses C conduct pulses to and from the scanner D shape the beam in vertical plane No 980 The purpose of the T/R cell is to > A paint the heading marker on the display B protect the receiver during transmission C radiate the radar pulses to the targets D shape the beam in the horizontal plane No 981 The commonest type of radar scanner is the A tilted parabolic cylinder B single cheese C double cheese > D horizontal slotted waveguide Page 327 of 583 No 982 The display trace is caused to rotate in synchronisation with the scanner by a signal from the A selsyn generator B duplexer C heading marker contacts > D scanner motor No 983 Incoming target echoes are detected by the > A video amplifier B mixer crystal C I.F amplifier D local oscillator No 984 Signals are converted to a suitable form for the display by the > A local oscillator B mixer crystal C I.F amplifier D video amplifier Page 328 of 583 No 985 The function of the local oscillator is to A limit the strength of the stronger target echoes B carry out final amplification of the echoes C convert the target echoes from an AC to a DC signal > D provide a frequency for mixing with the target signals No 986 Weaker echoes are converted to signals of detectable strength rqco_19.bmp by the A mixer crystals B limiter circuit C local oscillator > D I.F amplifier No 987 Signals are converted to a suitable form for the display by the > A local oscillator B I.F amplifier C video amplifier D mixer crystal Page 329 of 583 No 988 The purpose of the anodes in the C.R.T is to > A cause the screen to glow when hit by electrons B deflect the electrons to the edge of the screen C attract the electrons to the screen D focus to a sharp point at the screen No 989 The intermediate frequency is generated by the > A mixer crystal B magnetron C selsyn generator D local oscillator No 990 The intensity of the electron beam in the C.R.T is controlled by > A passing a current through the deflection coil B varying the potential on the grid C a signal from the time unit D the action of the first anode Page 330 of 583 No 991 A function of the deflection coils in a C.R.T is to > A focus the electron to a sharp image B control the flow C cause the electrons to form the trace D return the electrons from the screen to the cathode No 992 Target echoes are received in the display unit in the form of > A an increased potential to the grid B a pulse from the brightening unit to the cathode C a signal from the scanner to the deflection coil D a current from the final anode to the screen No 993 The trace on the display rotates > A in synchronization with the scanner B at half the speed of the scanner C at twice the speed of the scanner D independently of the scanner Page 331 of 583 No 994 The electrons in the Cathode Ray Tube ( CRT) are attracted > A from the grid to the cathode B from the cathode to the anodes C from the grid to the anodes D from the anodes to the cathode No 995 The brilliance control of a Cathode Ray Tube ( CRT ) operates on > A the deflection coil B the cathode C the anode D the grid No 996 The purpose of the gain control is to adjust > A the amplification of the target echoes B the brightness of the display control C the sharpness of the display focus D the frequency of the local oscillator Page 332 of 583 No 997 On a radar display, this symbol identifies the > A tuning control B gain control C focus control D brilliance control No 998 The tuning control adjusts > A the amplification of target echoes B the transmitted frequency C the frequency of the local oscillator D the amplification of power output No 999 If the trace is not correctly centred, error may occur when > A measuring ranges B using the gain control C measuring bearings D using the tuning control Page 333 of 583 No.1000 Echoes from rain can be reduced using the A S.T.C control B brilliance control C tuning control > D differentiator control [...]... Passages for the World Page 33 of 583 No 100 Your vessel is carrying a full cargo of scrap steel Which item of bridge equipment is likely to be unreliable? A The satellite navigator B The echo sounder C The gyro compass > D The magnetic compass No 101 What time is used for the ship's course recorder? > A Local time B Ship's time C GMT D Company head office time No 102 Which of the following options would... longitude 65°W, the LHA of a star is 48° If the SHA of the star is 217°, what is the GHA of Aries? > A 104 ° B 160° C 256° D 304° No 47 The true zenith distance of the Sun when on the observer's meridian bearing North is 6° and the declination is 16° N Calculate the observer's latitude > A 10 N B 10 S C 22° N D 22° S No 48 A position line drawn in the direction 085°/265° could correspond to an azimuth... 30°W longitude and the equation of time is -4 minutes, what is the GMT of noon at the ship? > A O956 B 100 4 C 1356 D 1404 No 41 Which of the statements listed is true in relation to the magnitude of stars? > A A 1st magnitude star is 100 times brighter than a 6th magnitude star B A 6th magnitude star is 100 times brighter than a 1st magnitude star C A 1st magnitude star is 6 times brighter than a 6th magnitude... plan No 105 Find the distance (departure) to the nearest whole mile between initial position 50° 00' N 178° 00' W and 50° 00' N 179° 00' E > A 116 miles B 138 miles C 180 miles D 39 miles Page 35 of 583 No 106 Calculate the distance (to the nearest mile) along the great circle between position 49° 18' N 123° 08' W and 33° 52' S 151° 12' E A 1684 miles B 3969 miles C 5726 miles > D 6746 miles No 107 On... visibility D Proceeding on the port side of a narrow channel to take advantage of a favourable current Page 34 of 583 No 103 When must a passage plan be prepared? > A Gradually during a sea voyage B Before the voyage commences C Whenever requested by a pilot D Any of the other options No 104 What should a passage plan include? > A The plan should include the first 72 hours of the sea voyage B The plan should... 175°W Page 22 of 583 No 67 To an observer in longitude 75°W, the LHA of the sun is 327° What is the GHA of the sun? > A 042° B 108 ° C 252° D 318° No 68 To an observer in longitude 172°E, the LHA of a star is 315° If the SHA of the star is 036°, what is the GHA of Aries? > A 091° B 107 ° C 127° D 143° No 69 The true zenith distance of the Sun when on the observer's meridian bearing North is 6° 57.4' and... more accurate means of position fixing? > A A radar range and bearing B Two radar bearings C Two visual bearings D A visual bearing and a radar range Page 32 of 583 No 97 You expect to sight land at 2100 By 2120 no land has been sighted, the visibility is good What action would you take? > A Keep looking out B Call the master C Stop engines D Alter course No 98 A vessel is under pilotage approaching... 123° 08' W and 33° 52' S 151° 12' E A 1684 miles B 3969 miles C 5726 miles > D 6746 miles No 107 On the Beaufort scale, force 7 is described as a > A fresh breeze B strong breeze C near gale D gale No 108 A vessel in initial position 40° 30' N 179° 00' W steams due east for 240 miles Calculate the new longitude to the nearest minute > A 175° 44' E B 173° 44' W C 175° 00' W D 175° 44'W Page 36 of 583