China Civil UAV Theory Questions — Questions 74–83
Unofficial study reference only. Not affiliated with or endorsed by any civil aviation authority — the official syllabus and regulations prevail.
UAV-Q0074. On a 1:500,000 aeronautical chart, 1 cm on the chart equals ________ on the ground.
Explanation
1 cm x 500,000 = 500,000 cm = 5,000 m = 5 km.
UAV-Q0075. How many kilometers is 1 nautical mile?
Explanation
Direct conversion: 1 nautical mile = 1.852 km; 1 statute mile = 1.609344 km; 1 inch = 2.54 cm; 1 foot = 30.48 cm.
UAV-Q0076. The latitude of the North Pole is ( )
Explanation
The North Pole is 90 degrees north latitude, the South Pole is 90 degrees south latitude, and the equator is 0 degrees.
UAV-Q0077. When refueling a large UAV, to guard against hazards from static electricity, note:
Explanation
Study note: choose grounding. The aircraft, fuel truck, and fuel nozzle can all build up static electricity, and all need to be grounded.
UAV-Q0078. The characteristic of a great-circle route between two points on the surface of the Earth is:
Explanation
The shortest route between two points on a sphere is the minor arc of a great circle.
UAV-Q0079. The shortest route distance between two points on the Earth refers to:
Explanation
The shortest route between two points on a sphere is the minor arc of a great circle.
UAV-Q0080. What are the three forms of map scale representation?
Explanation
The three forms of map scale representation are numeric, verbal, and graphic.
UAV-Q0081. The three elements of a map are:
Explanation
In the middle-school curriculum, the three elements of a map are scale, direction, and legend; here, direction can be understood as a kind of map symbol. Map projection is not one of the three elements.
UAV-Q0082. For a piston engine fitted with a fixed-pitch propeller, the instrument normally used to reflect power is:
Explanation
The tachometer reflects power: just as with driving, the faster the speed, the higher the rpm and the greater the power. With a fixed-pitch propeller, the pitch is fixed; ignoring air density, the work done in one revolution can be treated as fixed, so the faster it rotates per unit of time, the more work is done. The tachometer is therefore used to reflect engine power.
UAV-Q0083. Are aircraft overload and load factor the same concept?
Explanation
According to the definition in the Encyclopedia of China: aircraft overload is the ratio of the resultant of engine thrust and aerodynamic force acting on an aircraft in flight to the aircraft's own weight. It is also called flight overload, overload, and load factor.