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# Thermal Stresses & Poisson's Ratio II Achievers Practice Quiz 1

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Question 1

Theoretically, the upper limit of Poisson ratio is____.

Question 2

Consider the following statements:

If temperature of composite bar increases

1). Material having high value of coefficient of thermal expansion will subjected to compressive thermal stress.

2). Material having low value of coefficient of thermal expansion will subjected to tensile thermal stress

Which of the following statements is/are correct?

Question 3

Two composite bars of copper and steel, heated up to a certain temperature, then thermal stress developed in Copper and Steel bar respectively is?

Question 4

A steel rod is heated from 30° to 80°C and free expansion of rod is allowed while heating. If coefficient of exposition is 1.2 × 10–5 per °C and E = 110 GN/m2, then thermal stress developed in material is.

Question 5

The material of the rubber balloon has a Poisson’s ratio of 0.5. If uniform pressure is applied to blow the balloon, the volumetric strain of the material will be:’

Question 6

A steel bar 800 mm long and having 36 mm diameter is grinded to 35 mm diameter throughout its whole length. During grinding it is heated to 45°C above room temperature and then allowed to cool at room temp. It is clamped at both ends and distance between clamps is unchanged; the maximum stress developed in bar is _____. Assume αs = 12.5 × 10-6/°C and Elastic modulus (Es) = 200 GN/m2, Ambient temperature = 25°C

Question 7

A mild steel bar of square cross section 35 mm x 35 mm is 350 mm long. It is subjected to a longitudinal tensile strength of 400 N/mm2 and lateral compressive stress of 240 N/mm2 in perpendicular directions. E = 2 x 105 N/mm2,  = 0.3. What is the approximate elongation of the bar in the longitudinal direction?
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