Engineering Thermodynamics (3131905) MCQs

MCQs of Combustion

Showing 11 to 20 out of 25 Questions
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11.

If air-fuel mixture is supplied with excess air, resulting mixure is called__________.

(a)

lean mixture
(b)

rich mixture
(c)

balanced  mixture
(d)

all of the above
Answer:

Option (a)

12.

In practice, the combustion of fuel is always____________if stoichiometric amount of air is supplied.

(a)

complete
(b)

complete or incomplete
(c)

incomplete
(d)

efficient
Answer:

Option (c)

13.

Excess air is difference of _______________.

(a)

actual air and stoichiometric air
(b)

actual air and minimum air requirement
(c)

actual air and theoretical air
(d)

all of the above
Answer:

Option (d)

14.

Mixture strenght is__________.

(a)

difference of actual air and theoretical air
(b)

ratio of actual air and theoretical air
(c)

ratio of stoichiometric air-fuel ratio to actual air-fuel ratio
(d)

ratio of actual air-fuel ratio to stoichiometric air-fuel ratio
Answer:

Option (c)

15.

If actual air-fuel ratio less than  stoichiometric air-fuel ratio, mixture is said to be

(a)

lean mixture
(b)

rich mixture
(c)

chemically correct
(d)

balanced mixture
Answer:

Option (a)

16.

A bomb calorimeter is used to determine

(a)

higher calorific value at constant volume
(b)

lower calorific value at constant volume
(c)

higher calorific value at constant pressure
(d)

lower calorific value at constant pressure
Answer:

Option (a)

17.

A bomb calorimeter is used for finding the

(a)

LCV of gaseous fuel
(b)

HCV of gaseous fuel
(c)

LCV of solid fuel
(d)

HCV of solid fuel
Answer:

Option (d)

18.

The lower calorific value is

(a)

difference between HCV and heat absorbed by hydrogen for formation of steam
(b)

difference between LCV and heat absorbed by hydrogen for formation of steam
(c)

sum of HCV and heat absorbed by hydrogen for formation of steam
(d)

sum of LCV and heat absorbed by hydrogen for formation of steam
Answer:

Option (a)

19.

The calorific  value of gaseous fuel is given by unit

(a)

kJ/kg
(b)

kJ/m3
(c)

kJ/mole
(d)

kJ/K
Answer:

Option (b)

20.

The calorific  value of gaseous fuel can be determined by

(a)

Bomb calorimeter
(b)

Orsat appratus
(c)

Junker's Gas  calorimeter
(d)

None of the above
Answer:

Option (c)

Showing 11 to 20 out of 25 Questions
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