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Category: Chemical Engineering Basics
Viscoelastic behaviour is observed in _______________________ materials?
A. Non-crystalline organic polymeric
B. Ceramic
C. All crystalline
D. All amorphous
Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?
A. Vapour locking
B. Hot starting
C. Spark plug fouling
D. All A, B & C
______________ wire is never used for making the heating element ?
A. Nichrome
B. Kanthal
C. Invar
D. None of these
The most abundant metal present in the earth’s crust is__________________?
A. Iron
B. Copper
C. Titanium
D. Aluminium
Pearlite comprises of__________________?
A. 87% cementite & 13% Fe
B. 87% ferrite & 13% cementite
C. 93.33% ferrite & 6.67% C
D. 87% ferrite & 13% C
Regeneration of molecular sieve requires it to be heated to a temperature of about __________________ °C?
A. 80-120
B. 200-300
C. 600-800
D. 1000-1100
The activity of pure hydrogen gas at 1000°C and 5 atm pressure_________________?
A. Is always less than 1
B. Is always greater than 1
C. Can be 5
D. Depends on the choice of the standard state
With decrease in the grain size of a material, its creep resistance___________________?
A. Increases
B. Decreases
C. Remain constant
D. Either A. or B.; depends on the material
In the blast furnace, incorporation of water vapour in the blast gives the following effect ?
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal
A dummy activity is used in PERT network to describe the_____________________?
A. Precedence relationship
B. Resource idleness
C. Resource restriction
D. Necessary time delay
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