Chemical Engineering - Chemical Engineering Basics

21. 

A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient.

A. independent of
B. inversely proportional to
C. directly proportional to
D. none of these

Answer: Option C

Explanation:

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22. 

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

A. length of the pipe.
B. diameter of the pipe.
C. density of the fluid.
D. velocity of the fluid.

Answer: Option A

Explanation:

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23. 

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A. decreases & increases.
B. increases & increases.
C. increases & decreases.
D. decreases & decreases.

Answer: Option A

Explanation:

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24. 

Limestone addition in the blast furnace is done to flux __________ present in the raw materials.

A. SiO2
B. Al2O3
C. MnO2
D. P

Answer: Option A

Explanation:

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25. 

The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

A. carbon
B. manganese
C. both a & b
D. neither 'a' nor 'b'

Answer: Option A

Explanation:

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