(a)Compare the otto cycle with diesel cycle.
(b)Explain the working of a diesel engine. Derive an expression for its efficiency.

(a) What is a heat engine ? Name the important part of a heat engine. (b) Explain the working of a Carnot engine. Obtain an expression for its efficiency.

The temperature -entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

A carnot engine is operated between two reserviors at temperatures of 500 K and 400 K. The engine receives 840 Joules of heat from the source in each cycle. Calculate (a) the amount of heat rejected to sink in each cycle (b) the efficiency of the engine, and (c) the work done in each cycle.

Draw a Carnot cycle and on the diagram mark the work done by the engine.

The temperature of food material in refrigerator is 4^(@)C and temperature of environment is 15^(@)C . If carnot cycle is used in its working gas, then find its carnot efficiency.

(a) Derive the expression for the torque acting on a current carrying placed in a magnetic field. (b) Explain the significance of a radial magnetic when current carrying coil is kept in it.

If a Carnot engine works between 127^@C and 727^@C , then its efficiency is

Assertion : The Carnot cycle is useful in understanding the performance of heat engines. Reason : The Carnot cycle provides a way of deteriming the maximum possible efficiency achievable with reservoirs of given temperatures.

Describe nitrogen cycle in nature. Explain its importance in plants.