https://www.geekmcq.com/

Engineering :: Heat Transfer


51.  A substance above critical temperature exists as
A. Solid B. Liquid
C. Dry vapour D. Wet vapour
E. Gas    

52.  There are two spheres of copper the ratio of their radii being 1 : 3 both at the same temperature. The ration of heat contents will be
A. 1 ; 1 B. 1 ; 3
C. 1 ; 9 D. 1 ; 27
E. 1 ; 81    

53.  When analogy is drawn between heat flow and electricity flow in circuits, the heat flow of thermal circuits is equated in the electrical circuit against
A. Voltage B. Current
C. Resistance D. Charge (coulombs)

54.  Thermal diffusivity is least for
A. Rubber B. Lead
C. Aluminium D. Iron
E. Mercury    

55.  The lower temperature limit for mercury thermometer is
A. 0?C B. 0?F
C. ? 39?F D. 100?C
E. Absolute zero    

56.  For temperature below -40?C which one of the following substance can be used as thermometric substance
A. Alcohol B. Pentane
C. Ether D. Any of the above
E. None of the above    

57.  Heat is transferred from an insulated pipe to the surrounding still air mainly by
A. Conduction B. Free convection
C. Forced convection D. Radiation
E. All above together    

58.  Non-dimensional number generally involved in case of heat transfer from horizontal cylinder by natural convection is
A. Reynolds number B. Nusselt number
C. Prandtl number D. Grashof's numbr
E. (B), (C) and (D) above    

59.  Transformer oil having kinematic viscosity of 3.66 x 10-6 m2/s flows through a tube 8 mm diameter at velocity of 0.6 m/s. The value of Reynolds number of flow would be
A. 1000 B. 1310
C. 1415 D. 1510
E. 1625    

60.  The nature of flow of a fluid inside a tube i.e., whether it is turbulent or laminar, is ascertained by
A. Flow velocity B. Tube size
C. Surface conditions D. Viscosity of fluid
E. Reynolds number    




© 2012-2024 by GeekMCQ™ Technologies. All Rights Reserved | Copyright | Terms of Use & Privacy Policy

Contact us: info@geekmcq.com