Chemical Engineering Basics MCQs

Question 1

Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to

Accepted Answer

$$\frac{{{{	ext{r}}_2}\,.\,{{	ext{r}}_1}}}{{{{	ext{r}}_2} - {{	ext{r}}_1}}}$$

Answer

$$\frac{{{{	ext{r}}_2} - {{	ext{r}}_1}}}{{{{	ext{r}}_1} - {{	ext{r}}_2}}}$$

Answer

$$\frac{{{{	ext{r}}_1} + {{	ext{r}}_2}}}{{{{	ext{r}}_1}\,.\,{{	ext{r}}_2}}}$$

Answer

$$\frac{{{{	ext{r}}_1}\,.\,{{	ext{r}}_2}}}{{{{	ext{r}}_1} + {{	ext{r}}_2}}}$$

Question 2

The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.

Accepted Answer

200

Answer

100

Answer

1000

Answer

2000

Question 3

The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.

Accepted Answer

Absorption

Answer

Driving

Answer

Transmission

Answer

None of these

Question 4

Which of the following is not a charge material for cupola ?

Accepted Answer

Iron ore

Answer

Limestone

Answer

Iron scrap

Answer

Pig iron

Question 5

To counteract the bad effects of strain hardening on a cold formed part, it must be

Accepted Answer

Annealed

Answer

Tempered

Answer

Normalised

Answer

Hardened

Question 6

A good abrasive

Accepted Answer

Should be friable

Answer

Should have low refractoriness

Answer

Is made up of large size of crystals

Answer

Should be soft

Question 7

A hot short metal is

Accepted Answer

Brittle when hot

Answer

Hard when hot

Answer

Brittle when cold

Answer

Brittle under all conditions

Question 8

Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.

Accepted Answer

Water

Answer

Steel

Answer

Lignite

Answer

Lime stone

Question 9

A static fluid can not have

Accepted Answer

Non-zero shear stress

Answer

Zero shear stress

Answer

Positive normal stress

Answer

None of these