For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?

A. 0.4 times
B. 0.6 times
C. 0.7 times
D. 0.8 times

Basic hole is one_________________?

A. Whose upper deviation is zero
B. Whose lower deviation is zero
C. Whose lower as well as upper deviations are zero
D. Does not exist

If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________?

A. Diameter of bolt
B. 0.75 x diameter of bolt
C. 1.25 x diameter of bolt
D. 1.5 x diameter of bolt

In cross or regular lay ropes_________________?

A. Direction of twist of wires in strands is opposite to the direction of twist of strands
B. Direction of twist of wires and strands are same
C. Wires in two adjacent strands are twisted in opposite direction
D. Wires are not twisted

In V-belt drive, belt touches______________?

A. At bottom
B. At sides only
C. Both at bottom and sides
D. Could touch anywhere

The rated life of a bearing varies___________________?

A. Directly as load
B. Inversely as square of load
C. Inversely as cube of load
D. Inversely as fourth power of load

In hydrostatic bearings ____________________?

A. The oil film pressure is generated only by the rotation of the journal
B. The oil film is maintained by supplying oil under pressure
C. Do not require external supply of lubricant
D. Grease is used for lubrication

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?

A. Zn/p
B. P/zn
C. Z/pn
D. N/zp

In hydrodynamic bearings_____________________?

A. The oil film pressure is generated only by the rotation of the journal
B. The oil film is maintained by supplying oil under pressure
C. Do not require external supply of lubricant
D. Grease is used for lubrication

Aircraft body is usually fabricated by_________________?

A. Welding
B. Precasting
C. Rivetting
D. Casting