FUELS AND COMBUSTION QUIZ

Black liquor generated during paper manufacture is concentrated in a

single effect evaporator

single effect evaporator followed by a crystalliser

multiple effect evaporator

multiple effect evaporators followed by a crystalliser

TRUE ANSWER : ?
YOUR ANSWER : ?

Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Reynolds

Both A & B

Prandtl & Grashoff

Grashoff

TRUE ANSWER : ?
YOUR ANSWER : ?

The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Natural convection

Transient conduction

Steady state conduction

Forced convection

TRUE ANSWER : ?
YOUR ANSWER : ?

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Same as average heat transfer co-efficient for tube side

Zero

Infinity

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Dietus-Boelter equation cannot be used for molten metals mainly due to its very low

Prandtl number

viscosity

thermal conductivity

Grashoff number

TRUE ANSWER : ?
YOUR ANSWER : ?

Fouling factor

None of these

Accounts for additional resistances to heat flow

Is a dimensionless quantity

Does not provide a safety factor for design

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ paint has the minimum absorption co-efficient.

Light cream

Black

Grey

White lead

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat transfer rate per unit area is called

heat flux

thermal conductivity

heat transfer co-efficient

thermal diffusivity

TRUE ANSWER : ?
YOUR ANSWER : ?

According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

2f

f

f/2

f/4

TRUE ANSWER : ?
YOUR ANSWER : ?

Multiple effect evaporation accounts for

Investment economy

Lower operating costs

None of these

Steam economy

TRUE ANSWER : ?
YOUR ANSWER : ?

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