# Basic Mechanical Engineering(3110006)

BE | Semester 1  Unit : Heat Engines

## Q3 (b) Summer-2019   Derive the equation for efficiency of Carnot cycle.

Unit : Heat Engines

## Q3 (b) Summer-2019   Prove that the efficiency of Otto cycle is greater than that of Diesel cycle for the same compression ratio.

Unit : Heat Engines

## Q3 (b) Summer-2020   The efficiency of Otto cycle is a function of compression ratio: Prove it.

Unit : Heat Engines

## Q4 (a) Winter-2019   A diesel engine works on Diesel cycle with a compression ratio of 15 and cut off ratio of 1.75. Calculate the air standard efficiency. Assume γ = 1.4.

Unit : Heat Engines

## Q4 (b) Winter-2019   Derive the equation for air standard efficiency of Otto cycle.

Unit : Heat Engines

## Q4 (c) Summer-2019   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.

Unit : Heat Engines