Steam coal is a pulverised coal brown coal coking bituminous coal non-coking bit

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Home ‣ Mechanical Engineering ‣ Thermodynamics Comments

Question
Steam coal is a
Options
A. pulverised coal
B. brown coal
C. coking bituminous coal
D. non-coking bituminous coal

Correct Answer

non-coking bituminous coal

Thermodynamics problems

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1. The change of entropy, when heat is removed from the gas, is positive.
Options
A. Yes
B. No

Discuss

Correct Answer: No

2. When wood is heated with a limited supply of air to a temperature not less than 280�C, the resulting fuel is
Options
A. coke
B. wood charcoal
C. bituminous coal
D. briquetted coal

Discuss

Correct Answer: wood charcoal

3. In an ideal gas turbine plant, it is assumed that the compression and expansion processes are
Options
A. isothermal
B. isentropic
C. polytropic
D. none of these

Discuss

Correct Answer: isentropic

4. A cycle consisting of two isothermal and two isentropic processes, is known as
Options
A. Carnot cycle
B. Stirling cycle
C. Ericsson cycle
D. Joule cycle

Discuss

Correct Answer: Carnot cycle

5. The mass of excess air supplied is equal to
Options
A. x Mass of excess carbon
B. x Mass of excess oxygen
C. x Mass of excess carbon
D. x Mass of excess oxygen

Discuss

Correct Answer:

x Mass of excess oxygen

6. Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
Options
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kinetic theory of gases

Discuss

Correct Answer: First law of thermodynamics

7. The atomic mass of an element is the number of times the atom of that element is heavier than the hydrogen atom.
Options
A. True
B. False

Discuss

Correct Answer: True

8. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where R_u = Universal gas constant)
Options
A. R_u x T
B. 1.5 R_u x T
C. 2 R_u x T
D. 3 R_u x T

Discuss

Correct Answer: 1.5 R_u x T

9. The efficiency of Diesel cycle increases with increase in cut-off.
Options
A. Yes
B. No

Discuss

Correct Answer: No

10. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as
Options
A. isothermal process
B. adiabatic process
C. free expansion process
D. throttling process

Discuss

Correct Answer: throttling process

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Steam coal is a

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