18. Morse test in Multi-cylinder engines is used to determine
(A) Volumetric efficiency (B) Brake thermal efficiency
(C) Indicated power (D) Brake power

19. Thermal conductivity of copper with rise in temperature
(A) Decreases (B) Increases
(C) Remains constant (D) None of these

20. By which of the following modes of heat transfer, Heat is mainly transferred from an
insulated pipe to the surrounding still air?
(A) Conduction (B) Radiation
(C) Forced convection (D) Natural convection

21. Asliding bearing which can support steady loads without any relative motion between @
the journal and the bearing is called
(A) Zero film bearing (B) Boundary lubricated bearing
(C) Hydro dynamic lubricated bearing (D) Hydrostatic lubricated bearing

22. The piston pin bearings in heavy duty diesel engines are
(A) Needle roller bearing (B) Tapered roller bearing
(C) Collar bearing (D) Cylindrical roller bearing

23. The diameter of the hub of the fly wheel is usually taken as
(A) Equal to the diameter of the shaft
(B) Twice the diameter of the shaft
(C) Three times the diameter of the shaft
(D) Four times the diameter of the shaft

24. Aspur gear with pitch circle diameter D has number of teeth T. The module m is

(A) D/T (B) T/D
(C) x D/T (೧) 077

25. Lewis equation in a spur gear is used to find the
(A) Tensile stress in bending (B) Shear stress
(C) Compressive stress in bending (D) Fatigue stress

26. IfZ'is the absolute viscosity of the lubricant in Kg/m-s, N' is the speed of the journal in
rpm and p' is bearing pressure in N/mm? then the bearing characteristic number is
(A) ZN/p (B) Zp/N
(C) Z/pN (D) pN/Z

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