Nusselt number (for forced convection heat transfer) is a function of the _____________ number?

A. Prandtl
B. Reynolds
C. Both A. & B.
D. Neither A. nor B.

Electromagnetic radiations propagate in vacuum with a velocity of _______________ metre/second?

A. 3 × 105
B. 3 × 108
C. 3 × 1010
D. 3 × 1012

The purpose of providing expansion bellows in the shell of tubular exchanger is to _____________________?

A. Increase the heating load
B. Impart structural strength
C. Account for the uneven expansion of shell and tube bundles
D. Facilitate increase of shell length, if needed

In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass _____________ through the heat exchanger ?

A. Once
B. Twice
C. Thrice
D. Four times

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is _______________?

A. Free convection
B. Entry length problem in laminar forced conduction (developing thermal boundary layer)
C. Mixed convection (both free and forced)
D. Forced convection

Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?

A. Keeping the heat transfer surface clean
B. Enhancing the fluid pumping rate
C. Increasing the tube length
D. None of these

With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?

A. Decreases
B. Increases
C. Increases exponentially
D. Remain unaffected

_____________ equation relates the thermal conductivity of a solid to its temperature ?

A. Antoine
B. Kopp’s
C. Lee’s D. Kistyakowsky

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________________?

A. < 1
B. > 1
C. 1
D. ∞

A diathermanous substance _______________ the thermal radiation completely?

A. Absorbs
B. Reflects
C. Transmits
D. None of these