Pick up the correct statement from the following?

A. All pipes and fittings are classified according to their diameters
B. The diameter of the pipes is the nominal diameter of internal bore
C. All pipes are measured along the centre line of the pipes in metres
D. All the above

Castor angle is defined as the angle______________?

A. formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
B. between the direction of wind and the longitudinal axis of the runway
C. between the true speed of the aircraft and the crosswind component
D. between the horizontal and the fuselage axis

Select the correct statement?

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel
B. Elastic modulus of high tensile steel is more than that of mild steel
C. Carbon percentage in high carbon steel is less than that in mild steel
D. High tensile steel is cheaper than mild steel

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