DGCA Air Navigation: Ins / Irs / Fms Questions
301 exam-style Ins / Irs / Fms 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
Gyro compassing of an Inertial system (IRS) is accomplished with the mode selector switched to?
- AALIGN
- BSTBY
- CNAV
- DATT REF
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Correct answer: A. ALIGN
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- Q2
Which of the following lists all of the methods that can be used to enter 'Created Waypoints' into the CDU of a B737 - 400 Electronic Flight Instrument System?
- AIdentifier range, location name; Height above MSL; latitude and longitude.
- BIdentifier bearing/distance; place bearing/place bearing; along-track displacement; latitude and longitude.
- CIdentifier name and range; location name; Height above MSL; latitude nd longitude.
- DIdentifier grid reference, location name, Height above MSL, latitude and Rhumb line position.
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Correct answer: B. Identifier bearing/distance; place bearing/place bearing; along-track displacement; latitude and longitude.
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- Q3
Some Inertial reference and navigation system are known as "strapdown". This means that?
- AThe accelerometers are fixed to the aircraft structure but the gyros are stabiised.
- BThe gyros are stabilised but the accelerometers are fixed to the aircraft structure.
- CThe gyroscopes and accelerometers become part of the unit's fixture to the aircraft structure.
- DThe indicator units are strapped to the aircraft structure.
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Correct answer: C. The gyroscopes and accelerometers become part of the unit's fixture to the aircraft structure.
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- Q4
As the INS position of the departure aerodrome, coordinates 35°32,7'N 139°46.3'Ware input instead of 35°32.7'N 139°46.3'E. When the aircraft subsequently passes point 52°N 180°W, the longitude value shown on the INS will be?
- A099° 32.6'E
- B099° 32.6'W
- C199° 32.6'W
- D299° 32.6'W
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Correct answer: B. 099° 32.6'W
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- Q5
In order to maintain an accurate vertical using a pendulous system, an aircraft Inertial platform incorporates a device?
- AWith damping and a period of 84.4 MIN
- BWith damping and a period of 84.4 SEC.
- CWith damping and a period of 48.4 MIN
- DWith damping and a period of 48.4 SEC
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Correct answer: A. With damping and a period of 84.4 MIN
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- Q6
In what way does IRS differ from INS?
- AHas a shorter spin-up time and suffers from laser lock
- BDoes not need to correct for coriolis and central acceleration
- CHas a longer spin-up time and is not affected by vertical acceleration due to gravity.
- DDoes not experience Schuler errors as accelerometers are strapped down.
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Correct answer: A. Has a shorter spin-up time and suffers from laser lock
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- Q7
Which of the following statements is true of a Ring Laser Gyro?
- AIt is not necessarily fixed to true north and is quick to erect
- BIt is fixed to true north and is quick to erect
- CIf doesn't suffer from 'lock in' and is unaffected by the earth's gravitational force
- DIt is not necessarily fixed to true north but takes along time to erect
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Correct answer: A. It is not necessarily fixed to true north and is quick to erect
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- Q8
In a laser reference system (IRS), are compared to a gyro reference system (INS):
- AThe accelerometers are strapped down but the platform is gyro stabilised.
- BAccelerometers and platform are both strapped down.
- CThe platform is strapped down but the accelerometers are gryo-stabilised.
- DAccelerometers and platform are both gyro-stabilised.
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Correct answer: B. Accelerometers and platform are both strapped down.
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- Q9
In a ring laser gyro, the purpose of the dither motor is to:
- ACompensate for transport wander.
- BStabilise the laser frequencies
- CEnhance the accuracy of the gyro at all rotational rates
- DOvercome laser rock
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Correct answer: D. Overcome laser rock
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- Q10
A pilot turns off the power to his IRS whilst in flight. He switches it on again after just a few seconds. What will be the effect?
- AIt can be repositioned whilst in flight
- BThere will be no effect
- CIt cannot be used and must be shut down
- DIt cannot be used for navigation, but can be used provide attitude information
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Correct answer: D. It cannot be used for navigation, but can be used provide attitude information
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- Q11
In which IRS mode does gyro-compassing takeplace?
- AATT
- BALIGN
- CON
- DNAV
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Correct answer: B. ALIGN
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- Q12
What is IRS composed of?
- AAccelerometers and gyroscopes
- BPitot tubes and static ports
- CAntennas and receivers
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Correct answer: A. Accelerometers and gyroscopes
Inertial Reference System uses accelerometers and gyroscopes to track position and orientation without external signals.
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