Question Set 192

11.

In worm gears, the pressure angle is half the angle between two inclined faces in axial plane.

A.	Correct
B.	Incorrect

Answer: Option A

12.

For crank shaft bearings, the ratio of the length of the journal to its diameter is less than unity.

A.	Correct
B.	Incorrect

Answer: Option A

13.

Lewis equation in gears is used to find the

A.	tensile stress in bending
B.	shear stress
C.	compressive stress in bending
D.	fatigue stress

Answer: Option C

14.

In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

A.	the effect of curvature of the cylinder wall is neglected
B.	the tensile stresses are uniformly distributed over the section of the walls
C.	the effect of the restraining action of the heads at the end of the pressure vessel is neglected
D.	all of the above

Answer: Option D

15.

All stresses produced in a belt are

A.	compressive stresses
B.	tensile stresses
C.	both tensile and compressive stresses
D.	shear stresses

Answer: Option B

16.

An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

A.	increasing the length of bar
B.	decreasing the cross-sectional area of the bar
C.	decreasing the modulus of elasticity of the bar
D.	all of the above

Answer: Option D

17.

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

Answer: Option D

18.

A shaft is designed on the basis of rigidity and stiffness.

A.	Correct
B.	Incorrect

Answer: Option A

19.

Which of the following spring is used in mechanical wrist watch?

Answer: Option C

20.

In helical bevel gearing, the axes of shafts are __________ and the teeth are curved.

A.	intersecting
B.	non-intersecting and non-parallel

Answer: Option B