The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

to dip the nose and tail
to raise the nose and tail
to raise the nose and dip the tail
to dip the nose and ra
✅ The correct answer is option C.

Fatigue test is carried out for

stresses varying between two limits of equal value, but of opposite sign
stresses varying between two limits of unequal value, but of opposite sign
stresses varying between two limits of unequal value but of same sign
all of the above
✅ The correct answer is option D.

The diagram efficiency is the ratio of

workdone on the blades to the energy supplied to the blades
workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
none of the above
✅ The correct answer is option A.