Question

1-A jet airplane is flying to obtain maximum specific range. As fuel is burned the pilot must

a)maintain throttle and reduce airspeed.

b) reduce throttle and airspeed.

c)reduce throttle but maintain the same airspeed.

d)maintain throttle setting and let the plane accelerate.

3-The purpose of a mechanical linkage is to

a)Acts a support

b)Guide other links

c)Transmit motion

d)All of the given answers

2-The increase of drag above the critical Mach number is due to

a)wave drag

b)increased angle of attack

c)increased skin friction

d)increased interference drag

4-Aeroplanes designed with significant dihedral and sweepback have

a)greater longitudinal manoeuvrability.  

b)less lateral manoeuvrability

c)less longitudinal manoeuvrability

d)greater lateral manoeuvrability.

5-To be dynamically stable, an aeroplane must

be statically stable.

have the CoG within limits and aft of the centre of pressure, and positive wing dihedral.

have the CoG forward of the centre of pressure.  

have the CoG aft of the centre of pressure.

Answer 1

1.) A jet airplane is flying to obtain maximum specific range. As fuel is burned the pilot must: (b) Reduce throttle and airspeed .The heavier the airplane, the higher its maximum efficiency speed, so to achieve true maximum range you must continuously slow down as fuel burns.

3.)The purpose of a mechanical linkage is to: (d) all of the given answers. Mechanical linkages are usually designed to transform a given input force and movement into a desired output force and movement. Linkage in mechanical engineering, a system of solid, usually metallic, links (bars) connected to two or more other links by pin joints (hinges), sliding joints, or ball-and-socket joints so as to form a closed chain or a series of closed chains.

2.)The increase of drag above the critical Mach number is due to Wave drag presents itself as part of pressure drag due to compressibility effects. It is caused by the formation of shock waves around a body. Shock waves create a considerable amount of drag, which can result in extreme drag on the body.