B. Thermal conductivity

C. Viscosity

D. Grashoff number

A. Roughening the surface

B. Painting the surface black

C. Giving the surface a mirror finish

A. V? -0.8

C. 1/ V? -2

D. V? -2

A. K/h0

C. h0/K

D. h0/2K

B. 0.4

C. 1120

D. 2240

A. 1 calorie = 252 BTU

C. 1 BTU =453.6 calories

D. 1 calorie = 453.6 BTU

A. Refractory bricks

B. Aluminium foil

C. Iron plate

A. Radiation

B. Conduction

D. Natural convection

A. T

B. 1/?T

D. T2

B. Ideal

C. Saturated

D. Dilute

A. Neutral atmosphere

B. Oxidising atmosphere

C. Reducing atmosphere

A. Super saturation of the solution is the driving potential for a crystal growth

B. The first stage of crystal formation is called nucleation

D. The liquor left after the removal of crystals from a solution is called mother liquor

A. Increases

C. Increases linearly

D. Remains unchanged

A. Antoine equation

C. Kistyakowsky equation

D. Troutons rule

A. Forced convection

B. Natural convection

C. Radiation

A. Avogadros hypothesis

B. Charles law

C. Boyles law

A. -2448.45

C. 1632.3

D. 816.15

A. Vapor pressure at dry bulb temperature

B. Total pressure

D. Neither A. nor B.

A. Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator

C. Vaporisation of organic substances in evaporator mostly causes foam formation

D. Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling

A. Decrease the shell side heat transfer co-efficient

C. Force the liquid to flow parallel to the bank

D. Increase the cross-section of the shell side liquid

A. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

C. For reducing spalling tendency, the refractory should be well fired and its porosity should be more

D. The electrical resistivity of refractories drops rapidly with rise in temperature

A. Reflectivity = 0

C. Absorptivity = 0

D. All A., B. & C.

B. The emissivity of a polished surface is quite low

C. The emissivity of a surface increases with increase in surface roughness

D. The emissivity of a non-metallic surface decreases with increase in the temperature

A. avelength of 0.5 ?1</strong>

B. wavelength band between 3 ?m to 4 ?m. The fraction of this energy in the total energy

D. In process heat exchangers, saturated steam is preferred over the superheated steam

E. tted over the entire wavelength range is equal to emissivity

F. A body at 925 K emits an energy of 1.42 x 1011?W/m2 (? is the Stefan-Boltzmann constant) in

A. 0

C. 1

A. Fireclay

B. Silica

D. High alumina refractory

A. Vapor follows ideal gas law

B. Volume in the liquid state is negligible

D. Neither A. nor B.

A. Dissolved solids content

C. Hardness

D. Suspended solids content

B. Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection

C. The Peclet number is a measure of the ratio of energy transport by convection to that by conduction

D. The ratio NNu/NRe . Npr is called the Stanton number

B. 2-Oct

C. 6-Oct

D. 8-Oct

A. Magnesite chrome

B. Magnesia

C. Silica

A. Green strength

B. Voids

C. Shrinkage

A. Coke ovens

B. Regenerators

C. Muffle furnaces

A. T1 T2

C. T1 Ta

D. T2 Ta

A. Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number

C. In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2

D. Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

A. Is independent of its porosity and is maximum for insulating bricks

C. Decreases with decreases in porosity

D. Increases with the amount of air entrapped in pores

A. Pressure

B. Temperature

D. Neither A. nor B.

B. Brix = 145 (145/G)

C. Brix = 200 (G-1)

D. None of these

B. 200C

C. 273K

D. 100C

A. Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1"

B. Plate efficiency increases with increase in superficial vapour velocity till entrainment limit

D. Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value

A. 0.67

C. 0.33

D. 0.4

B. Stability of volume at high temperature

C. Resistance to slag penetration

A. Same as

C. Higher than

D. Not related to

B. Cork

C. Chemically prepared foam

D. Saw dust

A. Always less than 1000C

B. Increased by the addition of acid oxides

C. Not affected by the addition of acid oxides

A. Less

B. More

D. Either A. or B.; depends on the nature of the substance

A. R/2

B. 3R

C. 2R

A. Removal of pure solvent by evaporation

C. Changing the nature of the system by the addition of a more soluble material

D. Change of temperature thereby causing super-saturation

A. Crushing strength

C. Both A. and B.

D. Neither A. nor B.

A. Not required to resist the corrosive action of basic slag

B. Not subjected to fluctuation in temperature

C. Used for raising & maintaining high temperature