InterviewSolution

Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

51.	An aircraft is negatively stable when ______(a) its tailplane produces negative lift (downwards)(b) its tailplane produces positive lift (upwards)(c) its tailplane does not produce lift(d) it is flying invertedI have been asked this question during an internship interview.This intriguing question originated from Fly-By-Wire Technology topic in section Fly by Wire Flight Control of Avionics
Answer» Right choice is (b) its tailplane produces POSITIVE lift (upwards) To elaborate: An aircraft is said to be negatively stable when its tailplane produces positive lift. The tail of an aircraft without an FBW SYSTEM must ALWAYS produce negative lift to maintain stability and to keep the nose up. Since it produces negative lift, it actually acts in the direction of weight reducing aerodynamic efficiency. In an FBW equipped aircraft a positive lift producing tail can be used by using flight control COMPUTERS and motion SENSORS to main stability at all times.

52.	Why does an FBW system use a smaller tail area?(a) Bigger tails are harder to move as they produce larger wing loads(b) Actively controls the tail thus making up for the reduced stability due to lesser area(c) Tail does not contribute much to stability and its area can thus be reduced effectively(d) To reduce weight and drag but at a cost of natural stabilityThe question was posed to me during a job interview.I'd like to ask this question from Fly-By-Wire Technology in chapter Fly by Wire Flight Control of Avionics
Answer» Correct option is (d) To reduce weight and drag but at a cost of natural stability For explanation I would say: The reason for USING REDUCED tail AREA is to reduce weight, drag and to increase overall PERFORMANCE, But at a cost of reduced natural stability. A FBW makes up for the reduced stability by actively controlling the tailplane and RUDDER using accurate motion feedback sensors and actuators.

53.	What is the incidence angle in the yaw plane called?(a) Side slip angle(b) Yaw angle(c) Crossflow angle(d) Angle of crosswindThis question was posed to me at a job interview.Asked question is from Fly-By-Wire Technology in portion Fly by Wire Flight Control of Avionics
Answer» Right OPTION is (a) SIDE slip angle The best I can explain: The angle of INCIDENCE in the YAW plane is known as the side slip angle. It is the angle between the direction the aircraft is travelling and the direction its NOSE is pointing. When the side slip angle is high the aircraft is not in a coordinated turn and hence is flying inefficiently.

54.	What does FBW use to scale the control surface deflection according to the aircraft’s airspeed and height?(a) Air Data Computer(b) Flight Management System(c) Flight Control Computer(d) Autopilot systemThis question was addressed to me during an online exam.I need to ask this question from Fly-By-Wire Technology in division Fly by Wire Flight Control of Avionics
Answer» The correct choice is (a) Air Data Computer To elaborate: FBW uses an Air Data System to scale the CONTROL surface deflection according to the aircraft’s AIRSPEED and HEIGHT variations. The need for air data information on the airspeed and height is to compensate for the very wide variation in the control surface effectiveness over the aircraft’s flight envelope of height and speed combinations. The Air Data Computer provides various information AVAILABLE from the airstream such as airspeed, altitude, and angle of attack.

55.	In a typical quadruplex actuator system, how is the failure of an actuator identified?(a) By comparing it with the signal of the three good ones(b) By comparing it with a simulation model(c) Using in-lane fault detection(d) Using reflectometryI got this question in examination.My question is based upon Fly-By-Wire Technology in portion Fly by Wire Flight Control of Avionics
Answer» The CORRECT answer is (a) By comparing it with the signal of the three GOOD ones The EXPLANATION: A typical quadruplex system uses signal processing BASED FDI( Fault Detection and ISOLATION) system. It identifies the failed actuator by comparing its control signal with the other three good ones. A model-based FDI system is generally used in triplex architecture.

56.	What type of system is classified as “Direct electric link system”?(a) Systems with parallel wire connection(b) System with serial wire connection(c) System with motion sensor feedback(d) System without motion sensor feedbackThe question was asked in unit test.Question is from Fly-By-Wire Technology topic in portion Fly by Wire Flight Control of Avionics
Answer» The correct CHOICE is (d) System without motion sensor feedback The BEST I can EXPLAIN: A FBW system by DEFINITION has to have a motion feedback system. Without these, the system is considered as “Direct electric system”. The information from these sensors is used to automatically stabilize the aircraft.

57.	The reason for using quadruplex actuation system is _______(a) precise movement(b) to counteract heavy air loads on the control surfaces(c) quick reaction to the control stick movement(d) as a fail safe mechanismThe question was asked at a job interview.My query is from Fly-By-Wire Technology topic in chapter Fly by Wire Flight Control of Avionics
Answer» Right OPTION is (d) as a FAIL safe mechanism To explain I would say: A QUADRUPLEX actuation system consists of four independent actuators whose output drives the power control UNIT. The fail-safe mechanism of the quadruplex system is that when one fails three can override it. All four actuators have TOTALLY independent power and control electronics.

58.	Why are both electrical and hydraulic systems are used in the same aircraft?(a) To generate more force(b) Quick deflections(c) As a fail safe(d) Hydraulics for more force and electric for quick deflectionsThe question was asked by my school principal while I was bunking the class.The question is from Fly-By-Wire Technology topic in section Fly by Wire Flight Control of Avionics
Answer» RIGHT answer is (c) As a FAIL safe The best I can explain: Most of the main actuators are electro-hydraulic, fully electric actuators are used as a fail safe for hydraulic actuators. They MUST be able to survive any two failures and carry on OPERATING satisfactorily in order to meet the aircraft safety and integrity requirements.

59.	Why are actuators used in FBW systems?(a) Movement of control surfaces(b) Reduce drag(c) Increase lift(d) Safety equipmentThis question was posed to me during an online exam.My query is from Fly-By-Wire Technology topic in division Fly by Wire Flight Control of Avionics
Answer» CORRECT option is (a) Movement of control surfaces Easiest explanation: Unlike traditional aircraft, FBW system uses electrical signals to operate the ACTUATORS which in turn move the control SURFACE in place of mechanical linkages and control rods DIRECTLY connecting the pilot’s stick to the control surfaces.

60.	What type of cable is used in ARINC 629?(a) Coaxial cable(b) Screened twisted pair(c) Unscreened twisted pair(d) Parallel linesThis question was addressed to me in an online interview.This question is from Fly-By-Wire Technology in chapter Fly by Wire Flight Control of Avionics
Answer» Correct option is (C) Unscreened twisted pair Explanation: The ARINC 629 LINKS and bus uses an unscreened twisted pair of wires with a connection to the bus through DEMOUNTABLE current transformer couplers. Mil STD 1553 uses screened twisted pair cables. Parallel LINES are rarely used today.

61.	Which one of the following is a military standard data bus?(a) Mil Std 1553(b) ARINC 629(c) ARINC 429(d) COMAC C919I have been asked this question during an interview.My doubt is from Fly-By-Wire Technology topic in division Fly by Wire Flight Control of Avionics
Answer» The correct ANSWER is (a) Mil Std 1553 The best I can explain: Mil Std 1553 is a US military standard data bus which came out in the 1970S in the F-16 and the FOLLOWING models of fighter aircraft. It has a data rate of 1Mbit/sec and a word length of 20 bits to ENCODE clock, data, and address and so can receive or transmit up to 50,000 data words a second.

62.	How are FBW signals transmitted?(a) Simplex(b) Duplex(c) Time division multiplexing(d) Code division multiplexingThis question was addressed to me in an interview for job.This key question is from Fly-By-Wire Technology topic in chapter Fly by Wire Flight Control of Avionics
Answer» Correct choice is (c) Time division multiplexing For EXPLANATION: Transmission of electric signals is a KEY element in a FBW system. Faster the signal transmission, quicker the response of the aircraft to the PILOT stick controls. Time division multiplexing is used where signals can be transmitted along a network comprising only of two wires as only ONE set of DATA is being transmitted at any particular time.

63.	FBW system requires an air data system for control and stability.(a) True(b) FalseI have been asked this question in an interview for internship.I would like to ask this question from Fly-By-Wire Technology in section Fly by Wire Flight Control of Avionics
Answer» The correct option is (a) True The explanation is: The AIR data system provides various information like AIRSPEED, height(DENSITY of air), angle of ATTACK and TEMPERATURE. These parameters change with flight and are considered necessary to maintain optimal control and stability at all times.

64.	Which of the following is not a component of the FBW system?(a) Flight control computer(b) Aircraft motion sensor(c) Actuators(d) Communication receiversI have been asked this question in quiz.I'm obligated to ask this question of Fly-By-Wire Technology in section Fly by Wire Flight Control of Avionics
Answer» Correct choice is (d) Communication receivers For EXPLANATION: The fly by wire system consists of control stick (input by the PILOT), Flight control computer(processing UNIT), ACTUATOR control electronics(SIGNAL to actuators), actuator(movement of control surfaces). Communication systems are completely independent of FBW systems.

65.	Which one of the following is not true with respect to the FBW system?(a) FBW is not necessary for every aircraft(b) FBW makes an aircraft stealthy(c) FBW provides better control and carefree flying(d) FBW makes aircraft with low stability fly smoothlyThe question was posed to me in final exam.I'd like to ask this question from Fly-By-Wire Technology in portion Fly by Wire Flight Control of Avionics
Answer» Correct CHOICE is (b) FBW makes an aircraft stealthy The explanation: The FBW system need not necessarily provide stealth to an aircraft. It PROVIDES control, stability and CAREFREE flying in aircraft with low natural stability. Typically stealthy aircraft DESIGN is mainly focused on stealth and has very less stability, here FBW provides good handling and control CHARACTERISTICS to fly the aircraft without FBW system.

66.	How is fly by wire system implemented in an aircraft?(a) By using control rods and linkages connecting stick to control surfaces(b) By using high power radio transmitters and receivers(c) By using computers and actuators to control surfaces(d) Artificial intelligenceI had been asked this question in my homework.My question comes from Fly-By-Wire Technology topic in division Fly by Wire Flight Control of Avionics
Answer» The CORRECT answer is (c) By USING computers and actuators to control surfaces The best explanation: The fly by wire system uses actuators to move the control surfaces to maintain the stability of an aircraft. The signals sent by the pilot via the control STICK is intercepted by the flight controller computer and signals are sent to the RESPECTIVE actuators to move the control surfaces.

67.	Why is the BFW system used?(a) To control aerodynamically efficient but unstable body(b) For communications in aircraft(c) Better navigation(d) Reduced chances of enemy detectionI have been asked this question in semester exam.I want to ask this question from Fly-By-Wire Technology in section Fly by Wire Flight Control of Avionics
Answer» The correct answer is (a) To control aerodynamically efficient but unstable body Easy EXPLANATION: The literal MEANING of Fly By wire system is flying by wires(I.e; electrically). One of the main advantages of using FBW is to EXPLOIT increased aerodynamic shapes at the cost of stability. The FBW system PROVIDES high integrity automatic stabilization to compensate for the loss of stability and provide overall better performance.