17. A machine member is subjected to fluctuating stress = ocos(8t). The endurance limit of the material is 350 MPa. If the factor of safety used in the design is 3.5 then the maximum allowable value of is MPa (round off to 2 decimal places). 18. The number of qualitatively distinct kinematic inversions possible for a Grashof chain with four revolute pairs is (A) 3 (B) 2 (C) 1 (D) 4 19. Which of the following conditions is used lo determine the stable equilibrium of all partially submerged floating bodies? (A) Metacentre must be at a lower level than the centre of gravity (B) Centre of buoyancy must be below the centre of gravity (C) Centre of buoyancy must be above the centre of gravity (D) Metacentre must be at a higher level than the centre of gravity 20. The process, that uses a tapered horn to amplify and focus the mechanical energy for machining of glass, is (A) electrical discharge machining (B) abrasive jet machining (C) electrochemical machining (D) ultrasonic machining 21. For an air-standard Diesel cycle, (A) heat addition is at constant pressure and heat rejection is at constant volume (B) heat addition is at constant volume and heat rejection is at constant pressure (C) heat addition is at constant pressure and heat rejection is at constant pressure (D) heat addition is at constant volume and heat rejection is at constant volume