Related Questions

Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
A Acrylic
B Polyester
C Nylon 6:6
D Polypropylene
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.
A Polythene
B PVC
C Rayon
D Polyvinyl acetate
If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is
A $$\frac{{{\text{w}}\left( {{\text{R}} + {\text{T}}} \right)}}{{\text{T}}}$$
B $$\frac{{{\text{w}}\sqrt {{{\text{R}}^2} + {{\text{T}}^2}} }}{{\text{T}}}$$
C $$\frac{{{\text{w}}\sqrt {{\text{R}} + {\text{T}}} }}{{\text{T}}}$$
D $${\text{w}}\frac{{\text{R}}}{{\text{T}}}$$
If a 240-metre-long metro rail passes a pole in 24 seconds, how long will it take to pass a 650-metre-long platform?
A 60 seconds
B 75 seconds
C 89 seconds
D 130 seconds
In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer?
A Bakelite (phenol formaldehyde)
B Polyester
C Polythene
D Nylon-6
If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?
A $$\left( {A + B} \right)\alpha \,C$$
B $$\left( {A - B} \right)\alpha \,\frac{1}{C}$$
C $$\sqrt {AB} \,\alpha \,C$$
D $$\frac{A}{B} = {\text{constant}}$$
Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.
A 4-8
B 17-34
C 52-68
D 88-105
The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
A 0.1-0.2
B 0.2-0.5
C 0.4-0.9
D 1.2-1.5
Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.
A 0 to 0.08
B 0 to 0.8
C 0 to 1.5
D 0 to 2.2
In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
A Inverse
B Square root
C Second power
D First power

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