Q. A block of mass 10 kg rests on a horizontal floor. The acceleration due to gravity is 9.81 m/s2. The coefficient of static friction between the floor and the block is 0.2. A horizontal force of 10 N is applied on the block as shown in the figure. The magnitude of force of friction […]
Q. The table presents the demand of a product. By simple three-months moving average method, the demand-forecast of the product for the month of September is Month Demand January 450 February 440 March 460 April 510 May 520 June 495 July 475 August 560 (A) 490 (B) 510 (C) 530 (D) 536.67 Sol:
Q. The position vector OP of point P (20, 10) is rotated anti-clockwise in X-Y plane by an angle q = 30° such that point P occupies position Q, as shown in the figure. The coordinates (x, y) of Q are Ans: (12.32, 18.66) Sol: Let Co-ordinates of Q are (x’, y’) and rotation about
Q. The length, width and thickness of a steel sample are 400 mm, 40 mm and 20 mm, respectively. Its thickness needs to be uniformly reduced by 2 mm in a single pass by using horizontal slab milling. The milling cutter (diameter: 100 mm, width: 50 mm) has 20 teeth and rotates at 1200 rpm.
Q. Which one of the following welding methods provides the highest heat flux (W/mm2)? (A) Oxy-acetylene gas welding (B) Tungsten inert gas welding (C) Plasma arc welding (D) Laser beam welding Ans: Laser beam welding
Which one of the following welding methods provides the highest heat flux (W/mm2)? Read More »
Q. In a casting process, a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mold cavity is called (A) blister (B) sprue (C) riser (D) pin hole Ans: sprue Sol: In a casting process, a vertical channel through which molten metal flows downward, from the pouring
Q. Consider an ideal vapor compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle? (A) Coefficient of performance is higher than that of the original cycle. (B) Coefficient of performance
Q. A slender rod of length L, diameter d ( L >> d ) and thermal conductivity k1 is joined with another rod of identical dimensions, but of thermal conductivity k2 , to form a composite cylindrical rod of length 2L . The heat transfer in radial direction and contact resistance are negligible. The effective
Q. As per common design practice, the three types of hydraulic turbines, in descending order of flow rate, are (A) Kaplan, Francis, Pelton (B) Pelton, Francis, Kaplan (C) Francis, Kaplan, Pelton (D) Pelton, Kaplan, Francis Ans: Kaplan, Francis, Pelton
Q. For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant cross-section, the Nusselt number at constant wall heat flux ( Nuq ) and that at constant wall temperature ( NuT ) are related as (A) Nuq > NuT (B) Nuq < NuT (C) Nuq = NuT (D) Nuq = (NuT
