Q1.
(a) U22 \mathbf 2 SECTION – A (5 × 10 = 50) Answer the following questions in about 150 words each. Q1. A 150 mm diameter valve against which a steam pressure of 1.5 MN/m2 is Q1. acting is closed by means of a square threaded screw. The external diameter of the screw is 50 mm with mm pitch. If the coefficient of friction is 0.15, find the torque required to turn the handle. Assume uniform stress distribution and neglect self weight of member. A mild steel rod is designed to carry an axial tensile load of 75 kN. The permissible Q1.
(b) tensile stress for the material is 100 MPa. Determine the required cross-sectional dimensions of the member for each of the following cases. i) When the member is of circular cross-section, find the diameter. ii) When the member is of square cross-section, find the side of the square. iii) When the member is of rectangular cross-section, where the width is twice the thickness, determine both the width and thickness. Q1. Explain the structure and electronic properties of Carbon Nano Tubes (CNTs).
(c) How does chiral vector influence whether a nanotube is metallic or semiconducting? i) Distinguish between the cycloidal and Involute gear profiles along with tooth Q1.
(d) forming methods. ii) Explain the difference between Flywheel and Governor with suitable examples. Explain the transformation of austenite to martensite in steels.
(e) Discuss the main Q1. characteristics and morphology formed during this transformation. i) A cylindrical pressure vessel has an internal diameter of 600 mm and a wall Q2. (a) thickness of 25 mm. It is subjected to an internal fluid pressure of
