# Mcqs: Thin-thick shells-1

Mcqs: Thin-thick shells-1

A vessel is said to be thin if

1. Its wall has less thickness
2. Stresses are uniform over the entire thickness
3. Stresses  vary at inner and at outer radius
4. None of the above

(Ans:b)

In a thin vessel, the true ratio of D/t is

1. D/t =20
2. D/t=10
3. D/t >20
4. D/t >10

(Ans:c)

Hoop stress in a thin vessel is

1. pD/2t
2. pD/4t
3. pD/3t
4. None

(Ans:a)

Strength of a rivet is

1. Strength in shear
2. Strength in crushing
3. Strength in tension
4. None

(Ans:d)

Which stress is the least in a thin shell

1. Longitudinal stress
2. Hoop stress
4. None

(Ans:c)

Among the cylindrical and spherical thin vessels of same material, diameter and pressure which has the lesser thickness

1. Cylindrical shell
2. Spherical shell
3. Cylindrical shell with semi spherical heads
4. None

(Ans:b)

Radial stress in a thin shell is given by

1. pD/2t
2. pD/4t
3. pD/3t
4. None

(Ans:d)

When are the longitudinal and hoop stresses equal in a thin shell?

1. Longitudinal joint η =2 circumferential joint η
2. Longitudinal joint η = circumferential joint η
3. 2 Longitudinal joint η = circumferential joint η
4. None

(Ans:c)

A thin cylindrical shell under internal pressure can fail by

1. Shear
2. Compression
3. Tension
4. None

(Ans:c)

Failure of a thin spherical shell under internal pressure will be due to

1. Maximum shear stress
2. Principal compressive stress
3. Principal tensile stress
4. None

(Ans:c)

A thin cylinder fails under internal pressure along the

1. Longitudinal joint
2. Circumferential joint
3. Longitudinal as well as circumferential joint
4. None

(Ans:c)

What is the ratio of hoop stresses in a spherical vs cylindrical shell of same diameter, thickness and under same pressure?

1. 4:1
2. 2:1
3. 1:2
4. 1:4

(Ans:c)

Stresses in a thin cylindrical shell under internal pressure is independent of

1. Diameter
2. Thickness
3. Length
4. Diameter and thickness

(Ans:c)

Design of a thin shell under pressure is done on the basis of

2. Longitudinal stress
3. Hoop stress
4. All the three stresses

(Ans:c)

Which is most predominant type of failure in a thin shell?

1. Bearing failure
2. Compression failure
3. Crushing failure
4. None

(Ans:d)