默认题库 - 航海仪器使用说明书

单选题

Compass deviation is caused by（）.

A. magnetism from the earth's magnetic field
B. misalignment of the compass
C. magnetism within the vessel
D. a dirty compass housing

查看答案

单选题

（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.

A. Gain Control
Brilliant Control
C. Anti-clutter Sea Control
D. Sweep Intercept

查看答案

单选题

A Doppler log in the bottom return mode indicates the（）.

A. velocity of the current
B. bottom characteristics
C. depth of the water
D. speed over the ground

查看答案

单选题

A Doppler speed log indicates speed over ground（）.

A. at all times
B. in the bottom return mode
C. in the volume reverberation mode
D. only when there is no current

查看答案

单选题

A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines（）.

A. Separated line
B. Divided line
C. Reference line
D. Segregated line

查看答案

单选题

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

查看答案

单选题

AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.

A. Blind sectors
B. Sheltered area
C. Unseen area
D. Unscanable area

查看答案

单选题

The minimum range at which a target can be detected is basically determined by which of the following?（）.

A. persistence
B. pulse repetition rate
C. pulse length
D. rotation rate

查看答案

单选题

If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE?（）.

A. Compass error and variation are equal
B. Compass north will be true north
C. Variation will equal deviation
D. There will be no compass error

查看答案

单选题

（）the repeater compass with the master compass，please.

A. Similize
B. Clock
C. Synchronize
D. Positio

查看答案