21. For an ideal gas, the value of the Joule-Thomson coefficient is (A) zero (B) negative (C) positive (D) indeterminate 22. Match the following non-dimensional numbers with the corresponding definitions: Non-dimensional number Definition P. Reynolds number Byoyancy force 1. Viscous force Q. Grashof number Momentum diffusivity 2. Thermal diffusivity R. Nusselt number Inertia force 3. Viscous force S. Prandtl number Convective heat transfer 4. Conduction heat transfer (A) P-1, Q-3, R-2, S-4 (C) P-3, Q-1, R-4, S-2 (B) P-4, Q-3, R-1, S-2 (D) P-3, Q-1, R-2, S-4 24. Froude number is the ratio of (A) inertia forces to gravity forces (C) buoyancy forces to viscous forces (B) buoyancy forces to inertia forces (D) inertia forces to viscous force 25. In the Critical Path Method (CPM), the cost-time slope of an activity is given by Normal Cost Crash Cost - Normal Cost (A) (B) Crash Time - Normal Time Normal Time - Crash Time (C) Crash Cost - Normal Cost Crash Time Crash Cost (D) Crash Time-Normal Time 26. The 2 kg block shown in figure (top view) rests on a smooth horizontal surface and is attached to a massless elastic cord that has a stiffness 5 N/m. Horizontal surface v=1.5 m/s e Innovations Appris Block y GAZ Elastic Cord 0.5m X The cord hinged at O is initially unstretched and always remains elastic. The block is given a velocity v of 1.5 m/s perpendicular to the cord. The magnitude of velocity in m/s of the block at the instant the cord is stretched by 0.4 m is (A) 1.36 (B) 0.83 (C) 1.07 (D) 1.50 27. Consider two cases as below. Case 1: A company buys 1000 pieces per year of a certain part from vendor 'X'. the changeover time is 2 hours and the piece is Rs. 10 per piece. The holding cost rate per part is 10% per year. Case 2: For the same part, another vendor 'Y' offers a design where the changeover time is 6 minutes, with a price of Rs. 5 per piece, and a holding cost rate per part of 100% per year. The order size is 800 pieces per year from 'X' and 200 pieces per year from 'Y'. Assume the cost of downtime as Rs. 200 per hour. The percentage reduction in the annual cost for Case 2, as compared to Case 1 is (round off to 2 decimal places).