Section A
Q1.
(a) Explain the working and importance of the thermostat valve in the cooling system of an I.C. engine.
(b) Explain the working principles of a centrifugal governor with neat sketch diagram. How is the speed maintained constant under varying load conditions in an I.C. engine?
(c) What are the different types of threshing cylinders/drums employed on mechanical threshers for different crops? Explain them briefly with the help of sketches.
(d) Explain with the help of labelled diagram, the construction details of single reflector box solar cooker. What are the limitations of solar cookers?
(e) A high speed diesel engine running at 2000 rev/min has a single cylinder. During compression stroke, the fuel injection starts 20° before top dead centre and ends at the top dead centre. Calculate the duration (in seconds) of the fuel injection that takes place in the cylinder.