Engineering :: Heat Transfer

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61.

A dimensionless heat transfer coefficient which gives a measure of the ratio of the heat transfer rate to the rate at which heat would be conducted within the fluid under a temperature gradient is known as

A.	Reynolds number	B.	Grashoff number
C.	Nusselt number	D.	Peclet number
E.	Stanton number

62.

A dimensionless number which is the ratio of mass heat flow rate to the heat flow rate by conduction under a unit temperature gradient and through a thickness L is known as

A.	Peclet number	B.	Nusselt number
C.	Grashof number	D.	Weber number
E.	Prandtl number

63.

A non-dimensional number generally associated with natural convection heat transfer is

A.	Peclet number	B.	Nusselt number
C.	Prandtl number	D.	Grashof number
E.	Weber number

64.

A dimensionless number representing the ratio of inertia forces to viscous forces is known as

A.	Reynolds number	B.	Prandtl number
C.	Nusselt number	D.	Mach number
E.	Stanton number

65.

A dimensionless group which represents the rate of the (product of intertial forces times buoyant forces) to viscous force squared is known as

A.	Reynolds number	B.	Prandtl number
C.	Nusselt number	D.	Grashof number
E.	Mach number

66.

Dynamic similarity is the similarity of

A.	Shape	B.	Forces
C.	Velocities	D.	Effective dimensions
E.	None of the above

67.

A dimensionless number which is the ratio of kinematic viscosity to thermal diffusivity is known as

A.	Prandtl number	B.	Reynolds number
C.	Nusselt number	D.	Pacelet number
E.	Grashoff number

68.

A non-dimensional number which generally finds application in mass transfer problems is

A.	Stanton number	B.	Mach number
C.	Graetz number	D.	Grashoff number
E.	Weber number

69.

Longest wavelength

A.	Gamma rays	B.	X-rays
C.	Ultraviolet rays	D.	Radio waves
E.	Infrared rays

70.

The wagelength of X-rays is

A.	6 to 100000 micron	B.	0.4 to 0.8 micron
C.	0.1 to 0.4 micron	D.	0.014 to 0.018 micron
E.	0.8 to 400 micron