Machine Design Questions and Answers – Cylinder & Pressure Vessels

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Cylinder Pressure Vessels”.

1. A cylinder is considered thin when the ratio of inner diameter to wall thickness is more than 5.
a) True
b) False
View Answer

Answer: b
Explanation: A cylinder is considered thin when the ratio of inner diameter to wall thickness is more than 15.

2. Tangential stress in a cylinder is given by [symbols have their usual meanings].
a) PD/2t
b) 2PD/t
c) PD/4t
d) 4PD/t
View Answer

Answer: a
Explanation: Considering equilibrium in half portion of cylinder of unit length, DP=2σt.

3. Longitudinal stress in a cylinder is given by [symbols have their usual meanings].
a) PD/2t
b) 2PD/t
c) PD/4t
d) 4PD/t
View Answer

Answer: c
Explanation: Considering equilibrium PxπD²/4=σxπDt.
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4. A seamless cylinder of storage capacity of 0.03mᵌis subjected to an internal pressure of 21MPa. The ultimate strength of material of cylinder is 350N/mm².Determine the length of the cylinder if it is twice the diameter of the cylinder.
a) 540mm
b) 270mm
c) 400mm
d) 350mm
View Answer

Answer: a
Explanation: 0.03=πd²L/4 and L=2d.

5. A seamless cylinder of storage capacity of 0.03mᵌis subjected to an internal pressure of 21MPa. The ultimate strength of material of cylinder is 350N/mm².Determine the thickness of the cylinder if it is twice the diameter of the cylinder.
a) 12mm
b) 4mm
c) 8mm
d) 16mm
View Answer

Answer: c
Explanation: t=PD/2σ.
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6. Cylinder having inner diameter to wall thickness ratio less than 15 are
a) Thin cylinders
b) Thick Cylinders
c) Moderate cylinders
d) None of the listed
View Answer

Answer: b
Explanation: Smaller dia to thickness ratio implies more thickness and hence these are classified under thick cylinder.

7. Lame’s equation used to find the thickness of the cylinder is based on maximum strain failure.
a) True
b) False
View Answer

Answer: b
Explanation: It is based on maximum principal stress theory.
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8. Lame’s equation is generally used for ductile materials.
a) True
b) False
View Answer

Answer: b
Explanation: Lame’s equation is used to determine thickness of the brittle as it used principal stress theory.

9. The piston rod of a hydraulic cylinder exerts an operating force of 10kN. The allowable stress in the cylinder is 45N/mm². Calculate the thickness of the cylinder using Lame’s equation. Diameter of the cylinder is 40mm and pressure in cylinder is 10MPa.
a) 2.05mm
b) 4.2mm
c) 5.07mm
d) None of the listed
View Answer

Answer: c
Explanation: t=D/2[√[σ+ P /σ-P] -1 ].
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10. The piston rod of a hydraulic cylinder exerts an operating force of 10kN. The allowable stress in the cylinder is 70N/mm². Calculate the thickness of the cylinder using Clavarinoe’s equation. Diameter of the cylinder is 240mm.μ=0.3 and pressure in cylinder is 15MPa.
a) 35mm
b) 30mm
c) 27mm
d) None of the listed
View Answer

Answer: c
Explanation: t=D/2[√[σ+(1-2μ) P /σ-(1+μ)P] -1 ].

Sanfoundry Global Education & Learning Series – Machine Design.
To practice all areas of Machine Design, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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