Basic Mechanical Engineering — Summer 2019

Define Melting point, Boiling point and Tripple point of water using p-v diagram.

Define specific heat at Constant volume, constant pressure and Adiabatic index. Also derive relationship between specific heats in form of Characteristic gas constant.

Derive an expression for internal energy for a closed system.

Discuss the factors responsible for global warming and Ozone depletion

Explain Equivalent evaporation and factor of evaporation

Three kg of steam at a pressure of 10 bar exists in the following conditions. Calculate its enthalpy and internal energy in each of the cases. 1. Steam with x = 0.91 2. Steam at temperature 200o C

Determine the value of final dryness fraction of steam 1. After losing 125 kJ from the steam at constant pressure. 2. After expansion to 3 bar pressure in a turbine stage and work equivalent of 20 kJ/kg done Initially steam is available at 7 bar pressure and 0.9 dryness fraction.

Prove that the efficiency of Otto cycle is greater than that of Diesel cycle for the same compression ratio.

Explain the construction and function of Steam Trap with neat sketch. Also mention its specific location in the system.

Derive the equation for efficiency of Carnot

Adouble acting reciprocating pump has piston diameter of 150 mm and stroke length of 225 mm. the suction and delivery heads are 4 m and m respectively. If the speed of the pump is 80 rpm and the actual quantity of water discharged is 0.61 m3/min. find the percentage slip, the coefficient of discharge and the power required to drive the pump if the efficiency of the pump is 80%.

Explain the construction and function of Steam separator with neat sketch. Also mention its specific location in the system.

Air is to be compressed in a single stage reciprocating compressor from 1.013 bar and 15o Cto 7 bar. Calculate the indicated power required for free air delivery of 0.3 m3/min when the compression process is 1. Isentropic 2. Reversible isothermal 3. Polytropic with n = 1.25.1

Draw a neat sketch of p-v diagram for single stage compressor with clearance.

In an ideal Otto cycle the air at the beginning of isentropic compression is at 1 bar and 15oC. The ratio of compression is 8. If the heat added during the constant volume process is 1000 kJ/kg, determine (a) the maximum temperature in the cycle, (b) the air standards efficiency (C) work done per kg of air.

Apetrol engine with a stroke length of 200 mm and diameter of 150 mm has a clearance volume of 7 X 105 mm3. If the indicted thermal efficiency is 0.30, find the relation efficiency. If the effective pressure is 5 bar and engine runs at 1000 rpm. Find the IP of the engine. take γ=1.4

Calculate the energy consumed in one month for following conditions: COP of air-conditioning unit : Capacity of air conditioner : 2 TR No of air conditioners : All air conditioners run for 4 hours/day.

Draw a neat sketch of p-v diagram showing Free Air Delivery for air compressor.

It is required to produce ice from 36o water. The capacity of the ice plan is 6 ton and specific heat of the water is 4.18 KJ/kg.K. Determine the amount of ice produced in 3 hours.

Using neat sketch explain the working of Block brake and Internal expanding shoe brake.

Using neat sketch explain the working of Cone clutch and Centrifugal clutch

Discuss the operational difference between Vapour compression and Vapour absorption refrigeration cycle

Define following material properties. 1. Ductility 2. Plasticity 3. Malleability

Define pitch circle, diametral pitch, addendum and dedendum using neat sketch.

Define velocity ratio of pulleys and discuss effect of slip and creep on motion transmission,