Engineering thermodynamics mcq part 2

Engineering thermodynamics mcq part 2

1. Stirling and Ericsson cycles are.

reversible cycles.

Explanation: -

Throughout the entire reversible process, the system is in thermodynamic equilibrium with its surroundings.

2. When cut-off ratio is zero the efficiency of Diesel cycle approaches to.

Otto cycle efficiency.

Explanation: -The fuel is cut off when the volume is, say V2. The clearance volume is V1. So, remember the ratio V2/V1 is cut off ratio.

3. A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as.

thermodynamic cycle.

4. An isothermal process is governed by.

Boyle's law.

Explanation: -

An isothermal process is a change of a system, in which the temperature remains constant: ΔT = 0.

5. The efficiency of Diesel cycle depends upon.

cut-off ratio and compression ratio.

Explanation: -

The Diesel cycle is a combustion process of a reciprocating internal combustion engine. In it, fuel is ignited by heat generated during the compression of air in the combustion chamber, into which fuel is then injected.

6. The measurement of a thermodynamic property known as temperature is based on.

Zeroth law of thermodynamics.

Explanation: -

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

7. Kelvin-Planck's law deals with

Conversion of heat into work.

Explanation: -

The Kelvin–Planck statement (or the heat engine statement) of the second law of thermodynamics states that it is impossible to devise a cyclically operating device, the sole effect of which is to absorb energy in the form of heat from a single thermal reservoir and to deliver an equivalent amount of work.

8. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it.

This law is known as.

law of equipartition of energy.

9. The fuel mostly used in steam boilers is.

non-coking bituminous coal.

10. The efficiency of Joule cycle is.

less than Carnot cycle.

The Brayton cycle (or Joule cycle) represents the operation of a gas turbine engine.

A system undergoing a Carnot cycle is called a Carnot heat engine, although such a "perfect" engine is only a theoretical construct and cannot be built in practice.

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