Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

Question 1

If the static source of an altimeter becomes blocked during a descent the instrument will:

Accepted Answer

Continue to display the reading at which the blockage occurred

Answer

Under-read

Answer

Gradually indicate zero

Answer

Indicate a height equivalent to the setting on the millibar subscale

Question 2

When climbing at a constant CAS in a standard atmosphere:

Accepted Answer

TAS increases.

Answer

TAS remains constant.

Answer

TAS decreases.

Answer

TAS first decreases, then remains constant above the tropopause.

Question 3

The principle of a laser gyro is based on:

Accepted Answer

Frequency difference between two laser beams rotating in opposite direction.

Answer

A gyroscope associated with a laser compensating for gimballing errors.

Answer

A gyroscope associated with a laser compensating for apparent wander due to the rotation of the earth.

Answer

Two rotating cavities provided with mirrors.

Question 4

The position of the Flight Director command bars:

Accepted Answer

Indicates the manoeuvres to execute, to achieve or maintain a flight situation.

Answer

Repeats the ADI and HSI information

Answer

Enables the measurement of deviation from a given position.

Answer

Only displays information relating to radio-electric deviation.

Question 5

Given Pt = total pressure and Ps = static pressure, impact pressure is:

Accepted Answer

Pt - Ps

Answer

(Pt - Ps) / Ps

Answer

(Pt - Ps) / Pt

Answer

Pt / Ps

Question 6

A Machmeter may derive Mach number from the ratio of impact pressure to static pressure. With Pt denoting total pressure and Ps denoting static pressure, which expression gives that particular ratio?

Accepted Answer

(Pt - Ps)/Ps

Answer

(Pt + Ps)/Ps

Answer

(Pt - Ps)/Pt

Answer

Pt/Ps

Question 7

A leak in the pitot total pressure line of a non-pressurized aircraft to an airspeed indicator would cause it to:

Accepted Answer

Under-read.

Answer

Over-read.

Answer

Indication will drop to zero.

Answer

Freeze on the value it indicated at the time of failure.

Question 8

At a given altitude, the hysteresis error of an altimeter varies substantially with the:

Accepted Answer

Time passed at this altitude.

Answer

Mach number of the aircraft.

Answer

Aircraft attitude.

Answer

Static temperature.

Question 9

For a conventional chromel/alumel thermocouple connected directly to a moving-coil temperature indicator, without electronic amplification or a digital display, what external electrical supply is required?

Accepted Answer

No external supply for the temperature-measuring circuit; a separate supply may be required for gauge lighting

Answer

3 phase AC for sensor plus 28V DC for gauging

Answer

28V DC for sensor plus power for gauge lighting

Answer

3 phase AC for sensor plus 26V AC for gauge lighting

Question 10

The error in altimeter readings caused by the variation of the static pressure near the source is known as:

Accepted Answer

Position pressure error

Answer

Barometric error.

Answer

Hysteresis effect.

Answer

Instrument error.

Exam questions Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

ATPL - Airline Transport Pilot Licence: Aircraft General Knowledge - Instrumentation 10 Questions no time limit

Exam questions Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

ATPL - Airline Transport Pilot Licence: Aircraft General Knowledge - Instrumentation 10 Questions no time limit

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