Related Questions

Molecular seives are regenerated by heating to __________ °C.
A [

A.

B. 200-330

B > 500
C > 1000
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be
A 2M
B $$\frac{{\text{M}}}{2}$$
C M
D $$\frac{{\text{M}}}{4}$$
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
A Diffusion within the pellet
B Reaction
C External mass transfer
D None of the above
Which of the following factors control the deactivation of a porous catalyst pellet?
A Decay reactions
B Pore diffusion
C Form of surface attack by poison
D All of the above
B.E.T. method can be used to determine the __________ of a porous catalyst.
A Solid density
B Pore volume
C Surface area
D All of the above
Thermocole is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten
A Saturated polyester
B Polyurathane
C Polystyrene
D Either B or C
Which of the following is added in low carbon steels to prevent them from becoming porous?
A Sulphur
B Phosphorus
C Manganese
D Silicon
For preparation of porous bearings by powder metallurgy, preferred particle shape is
A Spherical
B Nodular
C Irregular
D No preferred shape
In Joule-Thomson porous plug experiment, the
A Enthalpy does not remain constant
B Entire apparatus is exposed to surroundings
C Temperature remains constant
D None of these
Highly porous refractory bricks are
A Less susceptible to chemical attack by molten fluxes and gases etc
B Very strong
C Having very high thermal conductivity
D None of these

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