LENGTH AND DIAMETER OF THE PIPE THE PARAMETER(S) RESPONSIBLE FOR LO...

4. Length and diameter of the pipe

The parameter(s) responsible for loss of heat from a hot pipe surface in

a room without fans would include

(a) 1 alone

(b) 1 and 2

(c) 1, 2 and 3

(d) 1, 2, 3 and 4

IES-5.

Which one of the following modes of heat transfer would take place

predominantly, from boiler furnace to water wall?

[IES-1993]

(a) Convection

(b) Conduction

(c)

Radiation

(d)

Conduction

and

convection

IES-6.

A solar engine uses a parabolic collector supplying the working fluid at

500°C. A second engine employs a flat plate collector, supplying the

working fluid at 80°C. The ambient temperature is 27°C. The ratio

maximum work obtainable in the two cases is:

[IES-1992]

(a) 1

(b) 2

(c) 4

(d) 16

IES-7.

Consider the following statements:

[IES-1998]