Chemical Engineering MCQs

6108 MCQs  (Page 71 of 611)

At absolute zero temperature, for any reaction involving condensed phases ?
A. Δ g° = 0 , δ h° = 0
B. Δ h° = 0 , δ s° = 0
C. Δ s° = 0 , δ e° = 0
D. Δ s° = 0 , δ cp° = 0
Insulation of liquid surface can be achieved by _____________ on top of its surface?
A. Floating hollow polypropylene spheres
B. Spraying alumina powder
C. Putting cement
D. None of these
The activity co-efficient of the solute in a dilute solution ?
A. Decreases with the increase of concentration of the solute
B. Increases with the increase of concentration of the solute
C. Remains constant
D. Is unity at infinite dilution
Joule-Thomson co-efficient is the ratio of________________?
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
Steels with high carbon equivalent have poor Weldability, because in these steels during welding________________?
A. Carbon and other alloying elements get oxidised from the weld pool
B. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D. Segregation of carbon and other element occurs in the weld pool leading to poor properties of