SSC JE Mechanical Engineering 27th Jan 2018 Shift-1
For the following questions answer them individually
For an Otto cycle, what is the air standard efficiency (in %), if the compression ratio is 5 for the swept volume?
If a Carnot engine rejects half of the heat absorbed from the reservoir (heat source). what is the efficiency of Carnot engine?
A refrigeration plant operates in reverse Carnot engine. The temperature is maintained at $$-10^\circ$$ C and the heat is transferred at the rate of 10 kW. The heat is transferred from the cycle to atmosphere at a temperature of $$25^\circ$$ C. What is the power (in kW) required to drive the plant?
In a cyclic process, the heat transfers are 15 kJ, -23 kJ, -3 kJ and 40 kJ. What is the net work (in kJ) for the cyclic process?
A liquid of mass 1.5 kg with specific heat of 3 kJ/kg-K is stirred causing the temperature rise of $$10^\circ C$$. What is the work done (in kJ) for the process, if the system is insulated?
A system has 4 kg of fluid $$(C_{v}=0.8)$$ that expands in a friction less piston from initial state of 1 MPa, $$200^\circ C$$ to 1 MPa, $$100^\circ C$$. What is the network (in kJ), if there is no heat transfer?
Air at 1 bar and $$40^\circ C$$ flows into an evacuated tank until the pressure in the tank is 1 bar. Assume that the process is adiabatic and the temperature of the surroundings is $$40^\circ C$$. What is the final temperature of air (in $$^\circ C$$)?
