# Vertical & Heading References MCQ’s

This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Vertical & Heading References”.

1. When is the gyro interrupted in erection cutoff method?
a) Deviation is large
b) Deviation is low
c) Never interrupted
d) Always interrupted

2. Which one of the following is the basic vertical reference in all forms of heading and attitude devices?
a) Line perpendicular to artificial horizon
b) Earth’s gravitational field
c) Line perpendicular to actual horizon
d) Earth’s magnetic field

3. How to determine the true vertical reference?
a) Differentiating
b) Time average of apparent vertical
c) Integration
d) Sum of all the apparent vertical

4. The error that occurs due to the rotation of Earth as well as the aircraft’s own motion is called as ______
a) Asymmetrical error
b) Precession rate error
c) Rate compensation error
d) Standoff constant error

5. What can be done to reduce to avoid poor acceleration error averaging?
a) Use higher order leveling loop
b) Use lowest order leveling loop
c) Use switch gravity sensors
d) Use differential leveling loop

6. Inertial heading references are better than a magnetic compass.
a) True
b) False

7. A special mode for initial leveling is needed when using erection cutoff mode.
a) True
b) False

8. The relative acceleration of a vehicle moving with respect to a rotating Earth can be divided into three parts.
a) True
b) False

9. Which of the following is not a unit of the magnetic field?
a) Gamma
b) Gauss
c) Tesla
d) Maxwell

10. Which of the following is not the angle between the horizontal component of B and true north?
a) Magnetic declination
b) Magnetic variation
c) Dip angle
d) Magvar

11. Which of the following is used to sense aircraft magnetic fields?
a) Magnetic compass
b) Airborne magnetometer
c) Accelerometer
d) Gyroscope

12. What is the orientation of the Earth’s magnetic axis with respect to its spin axis?
a) 2°
b) 0°
c) 11°
d) 24°

13. Why does magvar have diurnal change?
a) Magnetic pole migration
b) Static buildup error
c) Sensitivity of the instruments
d) Variation in aircraft magnetic effects

14. Magnetic compass is also called as whiskey compass.
a) True
b) False

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