Which of the following are false with respect to stellar navigation?

A)
Non-radiating
B)
Cannot be jammed
C)
Can be used in daylight and at night
D)
Position and altitude can be measured

Correct Answer :   Position and altitude can be measured

Explanation : High precision stellar inertial navigation systems have been developed with automatic daylight and night star tracking system. These are highly useful for military aircraft in that they provide accurate position and attitude information, are autonomous, non radiation and are invulnerable to jamming.

Recently Updated in Avionics Questions
Anti reflection coated optics reduce ________
A)
Refraction
B)
Reflection angle
C)
Intensity of star image
D)
Optical transmission losses

Correct Answer : Option (D) :   Optical transmission losses

Explanation : For anti-reflection coated optics, the optical transmission losses may be 1% or 2% at each air to glass or glass to air optical control surface within the telescope, including windows or sensor covers or surfaces. For uncoated optics, the loss per surface is about 4% to 5%.

The ratio of the focal length to aperture is called the ________
A)
Focal number
B)
f/ number
C)
Critical aperture
D)
Effective aperture

Correct Answer : Option (B) :   f/ number

Explanation : The ratio of focal length to aperture is called the f/ number. For example, an f/10 telescope may have a 30 in. focal length and a 3 in. aperture.

The physical size of the star depends upon _____
A)
Shape of image
B)
Colour of image
C)
Angular size of image
D)
Intensity of image

Correct Answer : Option (C) :   Angular size of image

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