CÂU HỎI TRẮC NGHIỆM CHUYÊN MÔN CHO SỸ QUAN QUẢN LÝ 1

The direction of a line drawn from an observer's assume or DR position towards the geographic position of the celestial body, when plotting an LOP or line of position is called:... Verti

D mean solar day

3 Belts of the Earth with strong winds

A Equatorial belt

B Westerlies

C Polar Easterlies

D Polar low belt

4 Is the angle at the pole measured from 000 to 360 deg westward from the meridian of the star

16 Variation of zone time used on or near with somewhat irregular but defined zone limit.

A local mean time

21 On or about June 21

A The southern part of the earth's axis is tilted toward the sun

B The sun shines equally on both hemisphere, North and South

C The northern hemisphere having its winter and southern hemisphere its Summer

D The sun reaches its highest declination north

22 Following spectra are having shorter wave length, Except:

24 The average rate of decrease of temperature with height, barring little exceptions is:

A 0.6 deg C per 100 meters

26 Light is the spectrum which becomes visible, because of

A Presence of medium, such as clouds and the like

B Terrestrial radiation balancing effect

C Sun's direct radiation

D Being a visible band spectrum

27 This is a correction to the sextant altitude applied to the visible horizon to obtain the sensible horizon

A Altitude correction

B Refraction

C Index error

D Dip

28 The direction of a line drawn from an observer's assume or DR position towards the

geographic position of the celestial body, when plotting an LOP or line of position is called:

C zenith

D declination

32 The time elapsed in a fixed locality between the occurrence of the wave crest and the

occurrence of the next

A GHA of the sun

B GHA of the moon

C GHA of the Aries

D Horizontal parallax of the moon

41 Vertical circle is to the horizon system, what Great Circle is for celestial equator system of coordinates?

A Prime vertical

B Hour circle

C Principal vertical circle

D Equinoctial

42 On the Tropic where the earth deflecting force is very slight, the dominant factor is a force which contribute to the tendency of the wind to go off at a tangent to the isobars is

A Corioli's force

B Centripetal force

C Frictional resistance force

D Centrifugal force

43 The narrow belt surrounding the earth roughly midway between the magnetic poles

where the Earth's field is horizontal

A length of the day equals length of night

B All night all throughout

C around the planet

D all twilight setting at the west

47 A major component of a radar system which amplifies the weak echoes received thus retaining its distinctive shapes

D The celestial equator system

49 Find the LHA of a star if the GHA of the star is 81 deg 57.3' and the longitude is 174 deg 32.9' West

C Mediterranean Sea

D Red sea

52 This is the amount of dissolved solid material in the water when carbonate has been

converted into oxide, bromide and organic material oxidized

54 The hour of day reckoned by the position of a celestial reference point to relative to a

reference celestial meridian

A the extension of the earth's observer at the equator

B the sphere seen by an observer at the equator

C The imaginary sphere of infinite radius with the earth at its center

D the arc of a great circle through the poles

60 Planets whose orbits are smaller than the earth's and is between the sun and the Earth

A Auroras

B Superior planets

C Asteroids

D Inferior planets

61 The chart indicates the variation was 3 degrees 45' East in 1993, the annual change is

increasing 6' If you use the chart in 2003, how much variation should you apply?

A 4 degrees 45'West

B 4 degrees 45'East

A the arc of the great circle through the poles of the celestial sphere

B A great circle through the celestial poles and a point or body on the celestial Sphere

C the path during the celestial body during its daily apparent revolution around the earth

D the arc of the celestial equator between the upper branch of the local celestial

meridian

64 What is the formula of amplitude?

A Sine A= sine decl/sin lat

B Cos A= sine decl x cos lat

C Sine A= sine decl x sec lat

D Cos A= sine decl/cos lat

65 The angular distance measured east or west of the local celestial meridian and is numerically equal to LHA if less than 180 degrees west

A Angle of apsides

B Meridian angle

C Hour angle

D Vertical angl

66 If the celestial body is at your meridian, it reaches

A its highest altitude

B its highest latitude

C its highest declination

D its highest amplitude

67 Term used for tropical cyclone in Caribbean

78 Greenwich hour angle of a star (GHA of a star) can be found by

A GHA of star = GHA of sun – SHA of star

B GHA of star = GHA of Aries – SHA of star

C GHA of star = GHA of sun + SHA of star

D GHA of a star = GHA of Aries + SHA of a star

79 The periodic horizontal movements of the water, during the rise and fall of the tide is called:

C Intermittent or heavy rains

D Halo around the moon

81 The navigational system which positioning is derived from the use of various electronic equipments

A Navigational Satellite system

A 110 degrees 12.2'

B 310 degrees 31.4'

C 156 degrees 56.2'

D 240 degrees 47.8';

83 This is alternately defined as the line joining places where there is no dip, and for this

reason, it is sometimes called Aclinic Line

85 Dumping of dying typhoon

A trade wind belt

B doldrums

C Prevailing westerlies

D polar low belt

86 Which is LEAST true why there is a "non-constant" rate on the apparent sun as a celestial reference for time?

A Motion of the sun along the ecliptic is tilted

B Revolution of the earth on its orbit is not constant

C The effect of nutation on the Earth's rotational axis

D Rotation of the Earth on its axis is not constant

87 It is the sextant error on the index mirror when not perpendicular to the plane of the

A None of these

B Diurnal

C Semi-diurnal

D Mixed type

92 The possible effect of one precessional cycle upon the global weather pattern and its climate

is to interchange the pattern to the opposite, every

A the angular distance east or west of the local meridian, through 180 deg

B the angular distance measured westward from the Greenwich meridian, through 360 deg

C the angular distance measured westward from the vernal equinox, through 360 deg

D the angular distance west of the local celestial meridian, through 360 deg

97 Factors affecting visibility

A West 27 degrees South

B West 27 degrees North

C South 27 degrees East

D East 27 degrees South

100 The rate of temperature decreases with height, commonly noticed at troposphere is called

A None of these

B Adiabatic changes

C Lapse rate

D Inversion rate

101 Gnomonic projection is based on

A Plane tangent at one point

B Cylinder tangent at the equator

C Cone tangent at selected parallels

D Cone tangent at one parallel

102 In a marine sextant, when the index arm is set to zero and the reflected image and the actual horizon is not in one continuous line, the error is _

A Graduation error

B No error

C Prismatic error

D Collimation error

103 The navigation satellite orbits the earth in _.

121 Which statement is True concerning equatorial tides?

A They occur when the Sun is at minimum declination north or south

B They occur when the Moon is at maximum declination north or south

C The difference in height between consecutive high or low tides is at a minimum.

D They are used as the basis for the vulgar establishment of the port

122 An alternating light

A shows a light with varying lengths of the lighted period

B shows a light that changes color

C marks an alternate lesser-used channel

D is used as a replacement for another light

123 The winds you would expect to encounter in the North Atlantic between latitudes 5° and 30° are known as the _

A doldrums

B westerlies

C trades

D easterlies

124 An important lunar cycle affecting the tidal cycle is called the nodal period How long is this cycle?

B on each side of the Equatorial Current

C in the North Atlantic between Greenland and Europe

D in the South Pacific near 5° S

126 A sextant having an index error that is "on the arc" has a _

B northeast trade winds

C southeast trade winds

D doldrums

128 At 0000 you fix your position and plot a new DR track line At 0200 you again fix your position and it is 0.5 mile east of your DR Which statement is True?

A The current is westerly at 0.5 knot

B You must increase speed to compensate for the current

C The current cannot be determined

D The drift is 0.25 knot

129 The class of tide that prevails in the greatest number of important harbors on the Atlantic Coast is

A interval

B mixed

C diurnal

D semidiurnal

130 When the equation of time is taken from the Nautical Almanac for use in celestial

navigation, it is used to determine _

A zone time

B sunrise

C time of local apparent noon

D local mean time

131 When the equation of time is taken from the Nautical Almanac for use in celestial

navigation, it is used to determine _

A doldrums

B horse latitudes

C trade winds

D prevailing westerlies

132 Neap tides occur when the _

A Moon is in its first quarter and third quarter phases

B Sun and Moon are on opposite sides of the Earth

C Moon's declination is maximum and opposite to that of the Sun

D Sun and Moon are in conjunction

133 Yesterday you took a time tick using the 1200 GMT broadcast, and the chronometer read 11h 59m 59s Today at the 1200 GMT time tick the chronometer read 00h 00m 01s What is the chronometer error?

A Gaining 2 seconds

B Losing 2 seconds

C Fast 2 seconds

135 Neap tides occur .

A at the start of spring, when the Sun is nearly over the equator

B only when the Sun and Moon are on the same sides of the Earth and are nearly in line

C when the Sun and Moon are at approximately 90° to each other, as seen from the Earth

D when the Sun, Moon, and Earth are nearly in line, regardless of alignment order

136 Weather system in the middle latitutdes generally travel from ?

A west to east

B east to west

C north to south

D none of the above

137 On March 17, at 0500 zone time, you cross the 180th meridian steaming eastward to west longitude What is your local time?

A You are in -12 time zone

B It is 1700, March 18

C It is 0500, March 16.

D It is 0500, March 18

138 Spring tides occur _

A at the start of spring, when the Sun is nearly over the equator

B only when the Sun and Moon are on the same side of the Earth and nearly in line

C when the Sun and Moon are at approximately 90° to each other as seen from the Earth

D when the Sun, Moon, and Earth are nearly in line, in any order

139 Which of the four adjustable errors in the sextant is the principle cause of index error?

A Telescope not being parallel to the frame

B Index mirror and horizon glass not being parallel

C Index mirror not being perpendicular to the frame

D Horizon glass not being perpendicular to the frame

140 It is 1200 local time for an observer at 54° East longitude Which statement is True?

A It is afternoon at Greenwich

B It is midnight at 126° East longitude

C The observer is in time zone -4.

D All of the above are true

141 Which of the four adjustable errors in the sextant causes side error?

A Horizon glass not being perpendicular to the frame

B Index mirror not being perpendicular to the frame

C Telescope not being parallel to the frame

D Elliptical centering error

142 The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator An error Not correctable by the navigator is _

A index error

B prismatic error

C perpendicularity of the horizon glass

D perpendicularity of the index mirror

143 On the pole side of the trade wind belt, there is an area of high pressure with weak pressure gradients and light, variable winds This area is called the

A center bearings

B tangent bearings

C ranges

D objects that are close aboard

145 The difference (measured in degrees) between the GHA of the body and the longitude of the observer is the

A right ascension

B meridian angle

C SHA of the observer

D zenith distance

146 Steady precipitation is typical of _

A coming cold weather conditions

B a warm front weather condition

C high pressure conditions

D scattered cumulus clouds

147 In order to remove index error from a sextant, you should adjust the _

A index mirror to make it parallel to the horizon glass with the index set at zero

B horizon glass to make it parallel to the index mirror with the index set at zero

C horizon glass to make it parallel to the sextant frame

D telescope to make it perpendicular to the sextant frame

148 Which of these sextant errors is nonadjustable?

A Prismatic error

B Graduation error

C Centering error

D All of the above

149 Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the:

A distance to the next port

B speed of the vessel over the ground or through the water

C time of the next navigational satellite pass

D None of the above

150 What is the longitude of the geographical position of a body whose Greenwich hour angle

152 The direction of prevailing winds in the Northern hemisphere is caused by the:

A magnetic field at the North Pole

B Gulf Stream

C Earth's rotation

D Arctic cold fronts

153 To predict the actual depth of water using the Tide Tables, the number obtained from the Tide Tables is _

A the actual depth

B added to or subtracted from the charted depth

C multiplied by the charted depth

D divided by the charted depth

154 If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?

A East to northeast

A navigable semicircle

B dangerous semicircle

C low pressure area

D eye of the storm

159 If the Sun's observed altitude is 27°12', the zenith distance is _

A northwest, west, and south

B southwest, south, and southeast

C north, northwest, and east

D west, northwest, and north

163 Tropical cyclones normally form within which of the following belts of latitude?

A the effects of beam width

B limitations on range resolution

C the pulse length of the radar

D the multiple-target resolution factor

165 You are anchored in the Aleutian Island chain and receive word that a tsunami is expected

to strike the islands in six hours What is the safest action?

A Get underway and be in deep, open-ocean water when the tsunami arrives.

B Increase the scope of the anchor cable and drop the second anchor underfoot at short stay

C Get underway and be close inshore on the side of the island away from the tsunami

D Plant both anchors with about a 60° angle between them, and let out a long scope to each anchor

166 A semi diameter correction is applied to observations of _

A Mars

B the Moon

C Jupiter

D All of the above

167 What is an advantage of the magnetic compass aboard vessels?

A Compass error is negligible at or near the earth's magnetic poles

B It does not have to be checked as often

C It is reliable due to it's essential simplicity.

D All points on the compass rose are readily visible

168 The error in the measurement of the altitude of a celestial body, caused by refraction, increases as the _

A horizontal parallax decreases

B observer's height above sea level increases

C humidity of the atmosphere decreases

D altitude of the body decreases

169 A line of position derived by radar range from an identified point on a coast will be a(n):

A straight line

B arc

C parabola

D line parallel to the coast

170 What instrument measures wind velocity?

174 In some river mouths and estuaries the incoming high tide wave crest overtakes the

preceding low-tide trough This results in a wall of water proceeding upstream, and is called

A Relative

B True

C Compass

D Magnetic

176 You are enroute from Puerto Rico to New York A hurricane makes up and is approaching

If the wind veers steadily, this indicates that your vessel is _

A in the dangerous semicircle

B in the navigable semicircle

C directly in the path of the storm

D in the storm center

177 The arc of a great circle which passes through the body and celestial poles is part of the:

A hour circle

B diurnal circle

C observer's meridian

D altitude circle

178 You are attempting to locate your position relative to a hurricane in the Northern

Hemisphere If the wind direction remains steady, but with diminishing velocity, you are most likely:

A in the right semicircle

B in the left semicircle on

C the storm track ahead of the center

D on the storm track behind the center

179 In a tropical cyclone in the Southern Hemisphere, a vessel hove to with the wind shifting clockwise would be

A ahead of the storm center

B in the dangerous semicircle

C directly behind the storm center

D in the navigable semicircle

180 Low pressure disturbances, which travel along the intertropical convergence zone, are called :

B sensitivity time control

C fast time constant

D pulse length control

182 Magnetic compass deviation _

A varies depending upon the bearing used

B is the angular difference between magnetic north and compass north

C is published on the compass rose on most nautical charts

D is the angular difference between geographic and magnetic meridians

183 What is the approximate wave length of an X Band Radar operating on a frequency of approximately 9500 MHz?

A 3 cm

B 10 cm

C 30 cm

D 100 cm

184 Your radar indicates a target; however, there is no visible object at the point indicated A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon You should suspect the radar target is caused by _

A a submerged submarine

B ducting

C sub-refraction

D ionospheric skip waves

185 What indicates that a tropical cyclone can be expected at your position within 24 to 48 hours?

A A daily fluctuation of over 6 millibars in the barometric reading

B A sudden wind shift from southwest to northwest followed by steadily increasing winds

C The normal swell pattern becoming confused, with the length of the swell increasing

D An overcast sky with steadily increasing rain from nimbostratus clouds

186 What kind of weather would you expect to accompany the passage of a tropical wave?

A Heavy rain and cloudiness

A multiple echoes

B spoking

C indirect echoes

D side-lobe echoes

188 What will cause the Arpa to emit a visual alarm, audible alarm, or both?

A An acquired target entering into a guard zone

B A tracked target lost for one radar scan

C A tracked target entering your preset CPA-TCPA limits

D A target being initially detected within a guard zone

189 Your Arpa has been tracking a target and has generated the targets course and speed The radar did not receive a target echo on its last two scans due to the weather What should you expect under these circumstances?

A The ARPA will generate data as if the target was still being tracked by radar.

B The ARPA will give an audible and/or visual lost target alarm

C The ARPA will generate data based on sea return echoes from the vicinity where the target was

D The ARPA has lost all "memory" of the target and must recompute the target data

190 What classification of tropical cyclone would have closed isobars, counter clockwise rotary circulation, and sustained winds between 34 and 63 knots?

10 knots through the water Which statement is True?

A The contact is dead in the water

B The contact is on the same course and speed as your vessel

C The contact is on a reciprocal course at the same speed as your vessel

D The radar is showing false echoes and is probably defective

192 Your ARPA has automatic speed inputs from the log Due to currents, the log is indicating

a faster speed than the speed over the ground What should you expect under these

circumstances?

A The generated CPA will be less than the actual CPA

B The generated TCPA will be later than the actual TCPA

C The range of initial target acquisition will be less than normal

D The targets true course vector will be in error

193 Monsoons are characterized by _

A light, variable winds with little or no humidity

B strong, gusty winds that blow from the same general direction all year

C steady winds that reverse direction semiannually

D strong, cyclonic winds that change direction to conform to the passage of an extreme low pressure system

194 You are underway at 10 knots At 1800 you note a radar contact dead ahead at a range of

10 miles At 1812 the contact is dead ahead at a range of 8 miles The estimated speed of the contact is

A dead in the water

A Set and drift of the current

B Relative track information

C Initial range of acquisition

D Initial range of acquisition

196 You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you 12 minutes later, the contact is 8 miles directly astern of you What is the estimated speed of the contact?

A Dead in the water

B 1 knot

C 10 knots

D 15 knots

197 A radar contact will remain stationary on a relative motion radar display only when it is:

A on the same course as your vessel

B at the same speed as your vessel

C on the same course and speed as your vessel

D on a reciprocal course at the same speed as your vessel

198 In mid-ocean, the characteristics of a wave are determined by three factors What is NOT one of these factors?

A Effect of the moon's gravity

B Fetch

C Wind velocity

D Length of time a wind has been blowing

199 Your ARPA has two guard zones What is the purpose of the inner guard zone?

A Alert the watch officer that a vessel is approaching the preset CPA limit

B Warn of small targets that are initially detected closer than the outer guard zone

C Guard against target loss during critical maneuvering situations

D Sound an alarm for targets first detected within the zone

200 The set of the current is the

A speed of the current at a particular time

B maximum speed of the current

C direction from which the current flows

D direction to which the current flows

201 What is the First sign of the existence of a well developed tropical cyclone?

A Gale force winds from the north

B An unusual long ocean swell

C Steep, short-period waves and light wind