DGCA Air Navigation: Gyroscopes & DGI Questions
120 exam-style Gyroscopes & DGI questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
A 2 axis gyro, measuring vertical changes will have:
- Aone degree of freedom, vertical axis
- Btwo degrees of freedom, vertical axis
- Cone degree of freedom, horizontal axis
- Dtwo degrees of freedom, horizontal axis
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Correct answer: B. two degrees of freedom, vertical axis
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- Q2
The term drift refers to the wander of the axis of a gyro in:
- A the horizontal plane
- B the vertical plane
- C the vertical and horizontal plane
- D any plane
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Correct answer: A. the horizontal plane
Drift refers specifically to the unwanted wander of a gyro's spin axis in the horizontal plane. Wander of the axis in the vertical plane is termed topple, not drift.
- Q3
The properties of a gyro are: 1. mass 2. rigidity 3. inertia 4. precession 5. rotational speed
- A1,2, & 3
- B2 & 4
- C2 & 3
- D1 & 3
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Correct answer: B. 2 & 4
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- Q4
The spin axis of a turn indicator-gyroscope is parallel to:
- AYaw axis.
- BLongitudinal axis.
- CPitch axis.
- DRoll axis.
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Correct answer: C. Pitch axis.
The rate gyro spin axis is horizontal, parallel to the lateral (pitch) axis.
- Q5
Concerning the directional gyro, the apparent drift rate due to the Earth's rotation is a function of:
- ALongitude.
- BLatitude and longitude.
- CMagnetic longitude.
- DLatitude.
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Correct answer: D. Latitude.
Apparent drift from Earth rotation equals 15 deg/hr times the sine of latitude.
- Q6
The building principle of a gyroscope, the best efficiency is obtained through the concentration of the mass?
- AClose to the axis and with a low rotation speed.
- BOn the periphery and with a high rotation speed.
- C Close to the axis and with a high rotation speed,
- DOn the periphery and with a low rotation speed.
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Correct answer: B. On the periphery and with a high rotation speed.
Efficiency is best with mass on the periphery and a high rotation speed.
- Q7
A Standby horizon or emergency attitude indicator?
- AOnly works of there is a complete electrical failure.
- BContains its own separate gyro.
- Cis automatically connected to the primary vertical gyro if the alternator fails.
- Dis fully independent of external energy resources in an emergency situation.
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Correct answer: B. Contains its own separate gyro.
A standby attitude indicator contains its own separate gyro and power.
- Q8
The basis properties bf a gyroscope are? 1. The gyro's weight. 2. The rigidity in space. 3. The inertia. 4. The high RPM. 5. The precession The combination of correct statements is?
- A3, 4.
- B2, 5.
- C2, 3, 5,
- D1, 3, 5,
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Correct answer: B. 2, 5.
The two basic gyro properties are rigidity in space and precession.
- Q9
The indications of the directional gyro when used as an on-board Instrument are valid only for a short period of time. The causes of this Inaccuracy are? 1. The earth's rotation. 2. The longitudinal acceleration. 3. The aircraft's motion over the surface of the earth. 4. The mechanical defects of the gyro. 5. The gyro's weight. 6. The gimbal mount of the gyro rings. The combination of correct statements is?
- A1, 3, 4.
- B1, 2, 3, 4, 5, 6.
- C2, 5, 6.
- D1, 3, 4, 6
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Correct answer: A. 1, 3, 4.
DG inaccuracy arises from Earth rotation, transport over the surface, and mechanical defects.
- Q10
The characteristics of the directional gyro (DG) used in a gyro stabilized compass system are?
- AOne degree of freedom, whose vertical axis, aligned with the real vertical to the location is maintained in this direction by an automatic erecting system.
- BTwo degrees of freedom, whose horizontal axis corresponding to the reference direction is maintained in the horizontal plane by an automatic erecting system.
- CTwo degrees of freedom, whose axis aligned with the vertical to the location is maintained in this direction by an erecting system.
- DOne degree of freedom, whose horizontal axis is maintained in the horizontal plane by an automatic erecting system.
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Correct answer: B. Two degrees of freedom, whose horizontal axis corresponding to the reference direction is maintained in the horizontal plane by an automatic erecting system.
The gyro-stabilised DG has two degrees of freedom with a horizontal reference axis.
- Q11
A DGI has;
- Aone degree of freedom & a horizontal spin axis
- Btwo degrees of freedom & a vertical spin axis
- Ctwo degrees of freedom & a horizontal spin axis
- Done degree of freedom & a vertical spin axis
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Correct answer: C. two degrees of freedom & a horizontal spin axis
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- Q12
A gravity type erector is used in a vertical gyro device to correct errors on?
- A An artificial horizon
- BA directional gyro unit.
- C A turn indicator,
- D A gyro-magnetic indicator.
Show answer
Correct answer: A. An artificial horizon
The gravity erector corrects errors on the artificial horizon (vertical gyro).
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