UPSC Mechanical Engineering 2024

(a) A rod of length 2 m and weight 450 N rests on ground at one end. The other end is supported by a cord through which a force of 200 N is applied. What is the minimum angle α fo…

(a) Bodies A, B and C of weights 100 N, 200 N and 150 N, respectively are connected as shown. If released from rest, what would be their respective velocities after 1 s? The pulle…

(a) Show the loading on the beams corresponding to the bending moment diagrams shown below. The beams are simply supported at A and B : (20 marks) (b) A rectangular plate with a c…

(a) A governor of Hartnell type has each ball of weight 20 N and the lengths of vertical and horizontal arms of the bell crank lever are 125 mm and 65 mm, respectively. The fulcru…

(a) A cutting tool is used to machine alloy steel at cutting speed of 40 m/min. Considering the values of constants c and n for cutting tool material as 300 and 0·5, respectively…

(a) A perfectly plastic material having yield strength of 300 MPa is subjected to extrusion at 400 °C. The extrusion speed is 300 mm/s. The extrusion process is done on billet of…

(a) An orthogonal cutting of metal is performed using cutting speed of 120 m/min, tool rake angle 5° and width of cut 5 mm. Cutting produces chip thickness 0·4 mm and generates ma…

(a) Explain the principle of electric discharge machining (EDM) using suitable diagram. Describe the effect of process parameters of electric discharge machining on process perfor…

(a) A 2 gm quantity of air undergoes the following sequence of quasi-static processes in a piston-cylinder arrangement: (i) An adiabatic expansion in which the volume doubles. (ii…

(a) Air flows through a 5 cm diameter pipe. Measurements indicate that at the inlet to the pipe the velocity is 70 m/s, the temperature is 80°C and the pressure 1 MPa. Find the te…

(a) A shell and tube heat exchanger used in a thermal power plant is designed to condense 500 kg/s of saturated steam entering the condenser at 20 kPa to saturated water. Cooling…

(a) A convergent-divergent nozzle is designed to expand air from a chamber in which the pressure is 800 kPa and temperature is 40°C to give Mach 2·5. The throat area of the nozzle…

(a) Explain the functions of three types of superheaters used in power boilers. Sketch the heat addition process in them on a T-s chart. Also mention the function of desuperheater…

(a) A four-cylinder gasoline engine has a bore of 75 mm and a stroke length of 100 mm. It is operated at 3000 rpm and tested at this speed against a brake which has a torque arm o…

(a) In a cooling tower used in a thermal power plant, 26,000 kg/s of air enters at DBT = 20°C and relative humidity at 20%. It leaves the cooling tower at 35°C DBT and 80% relativ…

(a) A cogenerating steam power plant operates with a boiler output of 25 kg/s steam at 7 MPa, 500°C. The condenser operates at 7·5 kPa and the process heat is extracted at 5 kg/s…