Aircraft Maintenance Mcqs - Set 12

1)   Which of the following is not a necessary component of the PFD?

a. Altimeter
b. Turn coordinator
c. Airspeed indicator
d. Flaps
Answer  Explanation 

ANSWER: Flaps

Explanation:
Flaps is not a necessary component of the PFD. However, altimeter, airspeed indicator and turn coordinator are all necessary components of the PFD., as described by the FAA.


2)   What is the full form of AMSL?

a. Altitude above mean sea level
b. Altitude above mean sea level
c. AOA above mean sea level
d. Airspeed above mean sea level
Answer  Explanation 

ANSWER: Altitude above mean sea level

Explanation:
AMSL refers to the altitude above mean sea level. The pitot system in aircraft is used to measure the AMSL. This is because the pitot system is useful in tracking air pressure measurements, which are necessary to find AMSL.


3)   What does the vertical speed indicator, indicate?

a. Rate at which the pressure changes
b. Rate at which the altitude changes
c. Rate at which the temperature changes
d. Rate at which the airspeed changes
Answer  Explanation 

ANSWER: Rate at which the temperature changes

Explanation:
The vertical speed indicator indicates the rate at which the altitude changes. It is usually represented with numbers in thousands of feet per minute.


4)   The PFD does not contain any mechanical parts.

a. True
b. False
Answer  Explanation 

ANSWER: True

Explanation:
True, the PFD does not contain any mechanical parts. The primary flight display is responsible for merely displaying data from the underlying mechanical systems.


5)   Which of the following is shown at the bottom of the PFD?

a. Airspeed Indicator
b. Heading display
c. Vertical Speed Indicator
d. Altitude Indicator
Answer  Explanation 

ANSWER: Heading display

Explanation:
The heading display is shown at the bottom of the PFD. Airspeed indicator, vertical speed indicator and altitude indicator are displayed at different positions on the PFD.


6)   Which of the following is not shown on the heading display?

a. Current heading
b. Airspeed
c. Thrust
d. Rate of turn
Answer  Explanation 

ANSWER: Airspeed

Explanation:
Thrust is not shown on the heading display. However, the heading display shows not only the current heading, but also the current rate of turn, current heading setting on the autopilot, and other indicators.


7)   A measurement of “+4” on the vertical speed indicator indicates an ascent of __________

a. 200 feet per minute
b. 2000 feet per minute
c. 400 feet per minute
d. 4000 feet per minute
Answer  Explanation 

ANSWER: 4000 feet per minute

Explanation:
A measurement of “+4” on the vertical speed indicator indicates an ascent of 4000 feet per minute. Similarly, a measurement of “-1.5” indicates a descent of 1500 feet per minute.


8)   PFD does not use the pitot-static system.

a. True
b. False
Answer  Explanation 

ANSWER: False

Explanation:
The PFD does not directly use the pitot-static system; however it still uses the system to make altitude, airspeed and other measurements precisely using other readings.


9)   Airbus proposed a common symbol system on the PFD and HUD with the __________

a. A380-800
b. A350-800
c. A350-1000
d. A330neo
Answer  Explanation 

ANSWER: A350-1000

Explanation:
Airbus proposed a common symbol system on the PFD and HUD with the A350-1000 aircraft. The A350-1000 when introduced was an engineering marvel, featuring improved aerodynamics and performance capabilities.


10)   Which of the following is the official language of aviation?

a. English
b. French
c. Spanish
d. Greek
Answer  Explanation 

ANSWER: English

Explanation:
English is the official language of aviation. All aviation communications are done using the language, irrespective of the local language of the place where aircraft is flying.


11)   The use of English in aviation industry is regulated by which of the following?

a. DGCA
b. FAA
c. ICAO
d. UNO
Answer  Explanation 

ANSWER: ICAO

Explanation:
The use of English in aviation industry is regulated by the ICAO. ICAO refers to the International Civil Aviation Organization, which is a specialized agency of the United Nations.


12)   Which of the following communications is not included in FANS?

a. Air traffic control clearances
b. Ground staff communications
c. Pilot requests
d. Position reporting
Answer  Explanation 

ANSWER: Ground staff communications

Explanation:
Ground staff communications are not included in FANS. However, air traffic control clearances, pilot requests and position reporting are all part of the FANS communication system.


13)   Which of the following is not a communication error?

a. Amount of information
b. Unclear pronunciation
c. Attenuation
d. Misunderstanding
Answer  Explanation 

ANSWER: Attenuation

Explanation:
Attenuation is not a communication error. However, amount of information, unclear pronunciation and misunderstanding are all types of a communication error.


14)   The protocol for ACARS was designed by ___________

a. Boeing
b. ARINC
c. FAA
d. ICAO
Answer  Explanation 

ANSWER: ARINC

Explanation:
The protocol for ACARS was designed by Aeronautical Radio, Incorporated (ARINC). It was deployed in 1978, using the telex format.


15)   The Airbus ICAO compliant product for the A320 family of aircrafts is known as __________

a. FANS-B
b. FANS-A
c. ICAO-D
d. ICAO-C
Answer  Explanation 

ANSWER: FANS-B

Explanation:
The Airbus ICAO compliant product for the A320 family of aircrafts is known as FANS-B. The term FANS refers to Future Air Navigation System. These are systems used on modern airliners to improve their navigational capabilities.


16)   The Airbus A380 and Boeing 787 have which of the following capability?

a. FANS-1/A
b. FANS-1/B
c. FANS-1/C
d. FANS-1/D
Answer  Explanation 

ANSWER: FANS-1/A

Explanation:
The Airbus A380 and Boeing 787 aircrafts have FANS-1/A capability. ARINC 622 standard is used to define such devices. The A380 and 787 are both modern airliners, featuring enhanced aerodynamic capabilities.


17)   What is the full form of ACARS?

a. Airplane communications addressing and reporting system
b. Aviation communications addressing and reporting system
c. Aircraft communications addressing and reporting system
d. Airspace communications addressing and reporting system
Answer  Explanation 

ANSWER: Aircraft communications addressing and reporting system

Explanation:
ACARS refers to Aircraft communications addressing and reporting system. Such systems make use of digital datalink technology and are helpful in transmitting short messages between an aircraft and the ground station.


18)   English was established as the international aviation language in ___________

a. 1951
b. 1901
c. 2001
d. 1991
Answer  Explanation 

ANSWER: 1951

Explanation:
English was established as the international aviation language in 1951. It was done so as to improve consistency, accuracy, and effectiveness of pilot – air traffic control communication.


19)   The more information needing transfer, the lesser is the chance for error.

a. False
b. True
Answer  Explanation 

ANSWER: False

Explanation:
False, the more information needing transfer, the greater is the chance for error. To avoid such errors and in order to improve this situation, a standard aviation language is important.


20)   Which is the only channel that retains 100 kHz channel spacing in the US?

a. 121.5 MHz
b. 131.5 MHz
c. 141.5 MHz
d. 171.5 MHz
Answer  Explanation 

ANSWER: 121.5 MHz

Explanation:
121.5 MHz is the only channel that retains 100 kHz channel spacing in the US. It is an emergency communication channel. No channel allocations are present between 121.4 and 121.5 or between 121.5 and 121.6.


21)   What is the transmission range of an aircraft flying at a cruise altitude of 35,000 feet?

a. 2000 mi
b. 400 mi
c. 200 mi
d. 4000 mi
Answer  Explanation 

ANSWER: 200 mi

Explanation:
The transmission range of an aircraft flying at a cruise altitude of 35,000 feet, is roughly around 200 miles, which is approximately 322 km. The range is dependent on the prevailing weather conditions and is reduced in extreme weather conditions.


22)   The VHF air band uses the frequencies between 108 and ___________ MHz.

a. 127
b. 137
c. 110
d. 237
Answer  Explanation 

ANSWER: 137

Explanation:
The VHF air band uses the frequencies between 108MHz and 137MHz. In most countries a license is required to operate an air band equipment.


23)   Which of the following is not true about VHF propagation?

a. Can penetrate building walls
b. Can travel long distances
c. Transmitting antennas are huge
d. Can be received indoors
Answer  Explanation 

ANSWER: Transmitting antennas are huge

Explanation:
VHF band is the first band which offers transmitting antennas small enough that they can be mounted on vehicles and portable devices. The VHF signals can be received indoors and are able to travel long distances if conditions are suitable.


24)   Which of the following is not a common use for radio waves in the VHF band?

a. FM radio broadcasting
b. Walkie-talkie communication
c. Marine communications
d. Television broadcasting
Answer  Explanation 

ANSWER: Walkie-talkie communication

Explanation:
Walkie-talkie communication is not a common use for radio waves in the VHF band. However, FM radio broadcasting, Marine communications and Television broadcasting are all common uses of radio waves in the VHF band.


25)   Frequencies lying immediately below VHF are referred to as _________

a. High frequency
b. Ultra high frequency
c. Low frequency
d. Ultra low frequency
Answer  Explanation 

ANSWER: High frequency

Explanation:
Frequencies lying immediately below VHF are referred to as high frequency. The high frequency band has a number of applications ranging from aviation communication, weather analysis and government usage. Further, the high frequency band succeeds the medium frequency band.


26)   When were the frequencies between 136.000 and 136.975 MHz added?

a. 1 January 2019
b. 1 January 2010
c. 1 January 1990
d. 1 January 1999
Answer  Explanation 

ANSWER: 1 January 1990

Explanation:
The frequencies lying between the 136.000 and 136.975 MHz bandwidth were added on 1 January 1990. These frequencies helped in increasing the total number of channels to 740. The addition was necessary to decrease the load on the existing channels.


27)   Radio operations used for aircraft communication make use of ___________

a. Amplitude modulation
b. Frequency modulation
c. Phase modulation
d. Channel Modulation
Answer  Explanation 

ANSWER: Amplitude modulation

Explanation:
Radio operations used for aircraft communication make use of amplitude modulation techniques. It is a reliable modulation technique and ensures that the signal is transmitted with minimal loss.


28)   Military aircraft also use a dedicated UHF-AM band from 225.0–399.95.

a. False
b. True
Answer  Explanation 

ANSWER: True

Explanation:
True, military aircraft also use a dedicated UHF-AM band from 225.0–399.95. It is used mainly for air-to-air and air-to-ground communications, including communications with the ATC.


29)   What is the full form of SSB modulation?

a. Shaky-sideband modulation
b. Separated-sideband modulation
c. Sorted-sideband modulation
d. Singe-sideband modulation
Answer  Explanation 

ANSWER: Singe-sideband modulation

Explanation:
SSB modulation refers to Singe-sideband modulation (SSB), or single-sideband suppressed-carrier modulation (SSB-SC). Under SSB modulation, the transmitter bandwidth and power are used in a more efficient manner and the system is based on AM Modulation.


30)   What is the maximum audio frequency at which an air band channel can operate?

a. 4.166 MHz
b. 4.166 mHz
c. 4.166 kHz
d. 4.166 Hz
Answer  Explanation 

ANSWER: 4.166 kHz

Explanation:
The maximum audio frequency at which an air band channel can operate is 4.166 kHz. The frequency is kept in accordance to the largest possible bandwidth of a particular air band channel, which is 8.33 kHz.