Engineering Chemistry II Practice Test 1

1. What’s the basic formulae for calculating gross calorific value?

[8080 %C + 34500(%H∕1 - %O∕8) + 2240 %S]∕100 cal/gm

[8080 %C + 34500(%H - %O∕24) + 2240 %S]∕100 cal/gm

[8080 %C + 3450(%H - %O∕8) + 2240 %S]∕100 cal/gm

[8080 %C + 34500(%H - %O∕16) + 2240 %S]∕100 cal/gm

2. How many burners are used in Boy’s calorimeter for finding the calorific value for gases and volatile liquid?

3. What is the unit of calorific value in fps(foot pound sec)?

Pound calorie

Gram calorie (g cal)

British thermal unit/ft3

Calorie/gram2

4. Why does bomb calorimeter require high pressure oxygen?

To ensure that the given sample in the crucible burns completely

To increase the kinetic energy

To increase the rate of reaction

To increase the ignition temperature

5. Net Calorific Value is greater than Gross Calorific Value.

True

False

6. Which of the fuel has the highest calorific value?

Kerosene

Natural gas

Butane

Wood

7. Which fuel causes least pollution?

LPG (Liquid Petroleum Gas)

Coal

Hydrogen gas

Diesel

8. A good fuel should possess ______ calorific value.

moderate

very low

high

low

9. Determine the gross calorific value (GCV) of a gas, having following results after using Boy’s calorimeter: Volume of the gaseous fuel burnt = 0.093 m³, weight of the water used for cooling = 30.5 kg, Weight of the steam condensed = 31 gm, Temperature of inlet water = 26.1 ⁰C and Temperature of outlet water = 36.5 ⁰C?

3310 cal/gm

3780 Kcal/gm

3100 Kcal/m³

3410 Kcal/m³

10. What happens to the hydrogen present in fuel for calculating gross calorific value?

It combines with oxygen to form hydrogen per oxide

It gets converted into steam

It combines with chlorine to form hydrochloric acid

It combines with carbon to form methane