PRESSURE ALTIMETER – Air – DGCA Question Bank For Politics

#1. The diagram below shows a simple altimeter. The parts labelled A, B, C and D are:

pitot pressure inlet, linkage mechanism, bellows, quadrant.

air inlet, temperature compensator, leaf spring, linkage mechanism.

static pressure inlet, partially evacuated capsule, linkage mechanism, subscale setting device.

static pressure inlet, partially evacuated capsule, leaf spring, linkage mechanism.

#2. In the International Standard Atmosphere, the mean sea level pressure is ......., the lapse rate of temperature ....... between MSL and ....... and is isothermal up to ........ The numbers missing are:

1225 mb; 2° per 1000 ft; 37 000 ft; 66 000 ft

1013.25 mb; 1.98°C per 1000 ft; 36 090 ft; 65 617 ft

1013.25 mb; 1.98°C per 1000 ft; 36 090 ft; 104 987 ft.

1225 mb; 1.98°C per 1000 ft; 36 090 ft; 104 987 ft

#3. An aircraft taking off from an airfield with QNH set on the altimeter has both static vents blocked by ice. As the aircraft climbs away the altimeter will:

read the airfield elevation.

indicate the aircraft height amsl.

read the height of the aircraft above the airfield

show only a very small increase in height

#4. When flying from low pressure to high pressure, the barometric error of an altimeter will cause the instrument to:

read the true altitude, providing a correction is made for temperature.

overread the true altitude of the aircraft

indicate a higher altitude than the correct one.

underread the true altitude of the aircraft.

#5. The errors affecting the pressure altimeter are:

instrument position, manoeuvre induced, density, temperature, lag

instrument, pressure, manoeuvre induced, density, temperature, lag.

instrument, pressure, lag, barometric, temperature, compressibility.

instrument, position, manoeuvre induced, temperature, barometric, lag.

#6. An altimeter with ....... set on the subscale will indicate ......., but with ....... set, the altimeter will show .......

1013; pressure altitude; QNH; height above mean sea level.

QNE; pressure altitude; QNH; height above airfield datum

QFE; height above the airfield datum; 1013; height amsl

QNH; height above touch down; 1013; height amsl

#7. An aircraft has one altimeter set to QFE and one to aerodrome QNH 1000 mb. If the airfield elevation is 300 ft, immediately before take-off the altimeter with QFE set will read ....... and the other ....... If the QFE altimeter is set to 1013 when passing through the transition altitude 3000 ft, it will read ...... (Assume 1 mb = 30 ft).

300 ft; zero; 2610 ft

zero; 300 ft; 3390 ft

zero; 300 ft; 3690 ft

zero; 300 ft; 2610 ft

#8. Which altimeter below is showing FL155:

A

B

C

D

#9. Below is a schematic diagram of a servo-assisted altimeter. The parts labelled A, B, C and D are:

cam mechanism, amplifier, servo motor, mechanical drive.

mechanical drive, servo motor, amplifier, AC exciter.

cam mechanism, amplifier, E-I bar, mechanical drive

E-I bar, amplifier, servo motor, AC exciter, mechanical drive.

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