Tuesday, August 30, 2016
S.B. Roll No. ___________
BASICS OF THERMAL AND HYDRAULICS ENGINEERING
3rd Exam/Auto Engg/0930/Dec 11
Q1 a) Fill in the blanks.
i. Boyle’s law is applicable when_________ is kept constant.
ii. The properties of a thermodynamic system, which are dependent on its_________, are known as extensive properties.
iii. Heat can flow from a body at___________ temperature to a body at_________ temperature.
iv. Three modes of heat transfer are__________.
v. Otto cycle consists of two adiabatic and two ________ processes.
b) State true or false.
vi. The vapours do not obey gas laws. (T/F)
vii. Zeroth law determines temperature. (T/F)
viii. In the diesel cycle the heat is supplied to the working substance at constant pressure. (T/F)
ix. Heat transfer is more in the case of natural convection than forced convection. (T/F)
x. In mines, the compressed air is used to drive the pneumatic tools. (T/F)
Note: Attempt any five questions.
Q2. Define the following:
a). Thermodynamics b). System. c). Boundary d) Surroundings.
Q3. Give the various industrial uses of compressed air.
Q4. Explain Zeroth law of thermodynamics.
Q5. Explain the phenomenon of heat transfer by conduction.
Q6. What are the basic components of a hydraulic system and explain its function.
Q7. 2.5 m3 of a gas at 8 bar abs. pressure expand at constant temperature to a volume of 10 m3 . Find the final pressure of the gas.
Note: Attempt any three.
Q8. Explain with neat sketch the construction and working of centrifugal compressor.
Q9. Derive an expression for the efficiency of an engine working on Otto cycle.
Q10. Write short note on following:
a). Isothermal process
b). Throttling Process.
c). One tonne of refrigeration.
Q11. Explain with the help of neat sketch the working of hydraulic jack and also write the law on which it works.
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