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Aircraft Design Mcqs

Q:

What is corrective maintenance?

A) Maintenance of equipment after failure or break down B) Maintenance before break down
C) Pre break down maintenance D) Scheduled maintenance
 
Answer & Explanation Answer: A) Maintenance of equipment after failure or break down

Explanation: Corrective maintenance is done after breakdown or failure. Maintenance done before breakdown is called preventive maintenance. Scheduled maintenance is similar to preventive.

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618
Q:

Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Most of the tails are using symmetric airfoils.
Reason[R]: Tail control has two primary control surface.

A) Both [A] and [R] are true and [R] is the correct reason for [A] B) Both [A] and [R] are true but [R] is not the correct reason for [A]
C) [A] is true but [R] is false D) [A] is false but [R] is true
 
Answer & Explanation Answer: B) Both [A] and [R] are true but [R] is not the correct reason for [A]

Explanation: Tail control has two control surface as primary control surface namely elevator and rudder. Tail has main function of providing stability and control. Hence, it should not produce lift at zero angle like wings otherwise it will affect the stability of the aircraft. Hence, [A] and [R] both true but [R] is not correct reason for given [A].

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168
Q:

Which of the following is a correct pair?

A) Testing major parts for fabrication – Conceptual Design B) Testing major parts for fabrication – Detail Design
C) Testing major parts for fabrication – Preliminary Design D) Testing major parts for fabrication – Initial Design
 
Answer & Explanation Answer: B) Testing major parts for fabrication – Detail Design

Explanation: The Detail design is the final stage of any Aircraft. Here, we consider the actual processes for designing from fabrication to manufacturing. Conceptual and preliminary are the intermediate stages of an Aircraft design.

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151
Q:

Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Typically control surface are tapered with same taper ratio as primary component such as wing or tail
Reason[R]: Control surface is used to provide trim control to the A/C

A) Both [A] and [R] are true and [R] is the correct reason for [A] B) Both [A] and [R] are true but [R] is not the correct reason for [A]
C) Both [A] and [R] are false D) [A] is false but [R] is true
 
Answer & Explanation Answer: B) Both [A] and [R] are true but [R] is not the correct reason for [A]

Explanation: Control surface is used to provide control to the aircraft. In general, we provide same taper ratio to the control surface as wing or tail. By using same taper ratio we can ensure that constant percent chord is being maintained by the surface.

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144
Q:

If slip function of propeller is 0.075 and diameter is 20 ft. then, determine the velocity of propeller. Given n = 25 rps.

A) 37.5 ft/s B) 40ft/min
C) 128ft D) 300ft/s2
 
Answer & Explanation Answer: A) 37.5 ft/s

Explanation: Velocity = slip function*diameter*rps = 0.075*20*25 = 37.5 ft/s.

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141
Q:

Consider a body is subjected to some force F which is acting on cross section area of 10m2. If stress due to application of the force is 25Pa then, found the value of F.

A) 250N B) 1500N
C) 0.89KN D) 890N
 
Answer & Explanation Answer: A) 250N

Explanation: Force or load = stress produced* cross section area = 25*10 = 250N.

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138
Q:

What is the limitation of current engine design?

A) Turbine inlet temperature B) Inlet flow velocity reduction limitation
C) Flow velocity over wing D) Expansion fan only
 
Answer & Explanation Answer: A) Turbine inlet temperature

Explanation: Turbine inlet temperature is one of the biggest obstacle of current engine design. For best Thrust and efficiency it is desirable to use stoichiometric air fuel ratio of 15:1. However, this generated tremendous high temperatures. Such high temperatures are beyond the limits of materials used for Turbine.

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137
Q:

At low subsonic speed, we should select _________

A) low bypass Turbofan engine B) turboprop always
C) always use ram jet D) subsonic speed cannot be achieved
 
Answer & Explanation Answer: A) low bypass Turbofan engine

Explanation: At low subsonic speed, low bypass Turbofan engine should be adopted among the given options. Turboprop has speed limitation due to propeller. Ram jet engine cannot be used at low subsonic speed as ram jet will require assistance to achieve adequate design condition. Ramjet can be used for speeds above Mach 2.8.

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