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1. In a complex stress system normal stress in X direction 20 MPa, Normal
stress in Y direction 80 MPa and shear stress in XY direction is 40 MPa.
find out max. shear stress..ans- 50 MPa
2. For a steady incompressible boundry layer, Bernoullis equation is
applicable when
a. Flow is steady
b. Flow is incompressible
c. Flow is transition
d. Not applicable because of more friction
Ans. (d)
3. Reheating in rankine cycle always improve
1. Net workdone
2. Efficiency
3. Steam quality at turbine exhaust
Ans.- 1 and 3
4. for a max. peak temp. , max. peak pressure and same heat rejection. what is
a relation between air standard efficiencyans- diesel>dual>otto
5. find the COP of reversed carnot heat pump having max. and min. temp. 37C
and 6C..ans- 10