State whether the following are True or False:

For the same compression ratio, efficiency of Otto cycle is more than Dual and Diesel cycle.

The important functions of lubricating system are lubrication and cooling.

In heat transfer by conduction, the thermal resistance increases with increase in thermal conductivity of material.

Fill in the blanks of the following:

Intake valve in a 4-stroke petrol engine closes after BDC to get advantage of effect.

Ramjet engines need start their operation.

(iii)Carburetor is used to the fuel and it with air.

Part of indicated power, which is lost due to friction, is called

2. Draw P-v and T-s diagram and derive an expression for efficiency of Dual cycle.

3. In an air standard Otto cycle, the temperature at the end of compression stroke is 700 K and maximum cycle temperature is 2500 K If engine delivers 780 kJ/kg of net work, find the thermal efficiency and compression ratio of the engine. Draw P-v and T-s diagram and take C=0·720 kJ/kg K

4. Discuss the working of turboprop engine, also draw its T-s diagram.

5. Explain the mechanism of detonation or knocking in S.I. engine. How is the knocking prevented?

6. A 4-stroke petrol engine delivers 40 kW with Mechanical efficiency of 85%. The fuel consumption of engine is 0·4 kg per-kW-hr and the fuel-air ratio is 14 1. The heating value of fuel is 42000 kJ/kg. Find the,

indicated power,

brake thermal efficiency, and

fuel consumption per hour.

7. Explain supercharging and its effect on power and efficiency. Also list the different types of superchargers.

8. Derive the expression of heat transfer through a composite wall consisting of two parallel slabs.

9. Explain the heat transfer by radiation and discuss Planck's distribution law.

10. Derive the expression for determination of venturi and fuel orifice size.

11. Describe in detail Air Cooling System.

12. Explain the different methods to measure brake horse power.