Category: CHEMICAL ENGINEERING
For efficient grinding, ball mills must be operated__________________?
A. At a speed less than the critical speed
B. At a speed more than the critical speed
C. At a speed equal to the critical speed
D. With minimum possible small balls
Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its_________________?
A. Molecular weight
B. Aromatics content
C. Both A. & B.
D. Neither ‘a’ nor ‘b’
Nitrolime is___________________?
A. Calcium nitrate
B. Calcium ammonium nitrate
C. A mixture of nitric acid and lime
D. A mixture of ammonium nitrate and calcium nitrate
In case of 1.5″ heat exchanger tubes, the inside flow area _____________ with decrease in BWG?
A. Increases
B. Decreases
C. Remains same
D. None of these
The most serious manufacturing defect from fracture toughness point of view is____________________?
A. Surface roughness
B. Pores
C. Spherical inclusion
D. Crack
In Fourier’s law, the proportionality constant is called the______________________?
A. Heat transfer co-efficient
B. Thermal diffusivity
C. Thermal conductivity
D. Stefan-Boltzmann constant
Internal energy is equal to the heat absorbed in case of a/an ______________ process?
A. Constant volume
B. Polytropic
C. Adiabatic
D. Constant pressure
“Micum Index” of a coke is a measure of its___________________?
A. Reactivity
B. Porosity
C. Bulk density
D. Hardness & strength
The reaction rate constants at two different temperatures T1 and T2 are related by _________________?
A. ln (k2/k1) = (E/R) (1/T2 – 1/T1)
B. ln (k2/k1) = (E/R) (1/T1 – 1/T2)
C. exp (k2/k1) = (E/R) (1/T2 – 1/T1)
D. exp (k2/k1) = (E/R) (1/T1 – 1/T2)
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