DGCA Air Navigation: Engine Instruments Questions
62 exam-style Engine Instruments 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
What type of sensor is used to measure the output of a low pressure booster pump
- Abourdon tube
- Baneroid capsule
- Cbellows
- Ddifferential capsule
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Correct answer: C. bellows
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- Q2
A vibration meter measures
- Afrequency in Hz
- Bamplitude at a given frequency
- Cperiod in seconds
- Dacceleration in g
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Correct answer: B. amplitude at a given frequency
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- Q3
Which of the following are used to measure temperature 1. thermocouple 2. resistance 3. reactance 4. mercury
- A1,2,3,4
- B1,2, & 4
- C2,3, & 4
- D1,3,& 4
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Correct answer: B. 1,2, & 4
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- Q4
A millivoltmeter measuring electromotive force between a hot and a cold junction of a thermocouple can be graduated to read temperature if: -
- Athe hot junction is kept at a constant temperature
- Bthe cold junction is maintained at 15 degrees C
- Cthe hot junction is maintained at 15 degrees C
- Dthe cold junction is maintained at a constant temperature
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Correct answer: D. the cold junction is maintained at a constant temperature
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- Q5
If both displays of an EICAS system fail what information will be displayed on the standby engine indicator
- AN1,EPR,N2
- BN1,EPR, EGT
- CN2,EPR, EGT
- DEGT,N1, FF
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Correct answer: B. N1,EPR, EGT
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- Q6
A capacitive type gauging system may measure mass due to:
- Afuel dielectric constant being equal to that of air and proportional to density
- Bfuel dielectric constant being equal to that of air and proportional to1/density
- Cfuel dielectric constant being twice that of air and proportional to density
- Dfuel dielectric constant being twice that of air and proportional to 1/density
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Correct answer: C. fuel dielectric constant being twice that of air and proportional to density
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- Q7
If the intake probe of an EPR system becomes blocked with ice this will cause the EPR gauge to
- Aunder-read during take off
- Bunder-read during take off
- Cbe unaffected
- Dread zero
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Correct answer: B. under-read during take off
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- Q8
The power output of a turbo-propeller aircraft is measured by the amount of torque being produced. The indication can be in which of the following units. 1. Newton metres 2. PSI 3. Percentage 4. Pounds feet 5. EPR
- A1,2,3,4,5
- B1,2,3,5
- C2,3,4,5
- D1,2,3,4
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Correct answer: D. 1,2,3,4
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- Q9
If one probe of a multi-sensor T.G.T. system failed , the reading would:
- Aincrease by 20 – 30 degrees C
- Bdecrease by 20 – 30 degrees C
- Cbe practically unaffected
- Dfall to zero
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Correct answer: C. be practically unaffected
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- Q10
During the take-off run , the effect of increasing airspeed is to cause the EPR indication to :
- Aremain constant
- Bincrease
- Cdecrease
- Dincrease and subsequently decrease
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Correct answer: C. decrease
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- Q11
An advisory message on the EICAS system screen would be:
- Adisplayed in amber on the lower screen with associated caution lights and aural tones
- Bdisplayed in red, normally on the upper screen , and requiring immediate corrective action
- Cdisplayed in amber, normally on the upper screen with aural warnings .
- Ddisplayed in amber, normally on the upper screen, indented one space to the right.
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Correct answer: D. displayed in amber, normally on the upper screen, indented one space to the right.
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- Q12
A supercharged aircraft is climbing at its maximum permitted boost of 8 psi (16in.Hg) from sea level to its full throttle height of 10,000 feet. If sea level pressure is 29.92in.Hg , when the aircraft reaches 5000 feet, where the pressure is 24.72in.Hg, what will be the approximate indication on the MAP gauge.
- A18 in Hg
- B33 in Hg
- C41 in Hg
- D46 in Hg
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Correct answer: D. 46 in Hg
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