# MCQ in Thermodynamics Part 11 | ECE Board Exam

(Last Updated On: February 22, 2020) This is the Multiples Choice Questions Part 11 of the Series in Thermodynamics as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

### Online Questions and Answers in Thermodynamics Series

Following is the list of multiple choice questions in this brand new series:

MCQs in Thermodynamics
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII
PART 9: MCQs from Number 401 – 450                 Answer key: PART IX
PART 11: MCQs from Number 501 – 550                Answer key: PART XI

### Continue Practice Exam Test Questions Part XI of the Series

501. How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?

• a. 4
• b. 3
• c. 2
• d. 1

502. What is the value of the work done for a closed, reversible isometric system?

• a. zero
• b. positive
• c. negative
• d. positive or negative

503. The first law of thermodynamics is based on which of the following principles?

• a. Conservation of mass
• b. Conservation of energy
• c. Action and reaction
• d. The entropy-temperature relationship

504. Which of the following cycle is used in vapor cycle power plant?

• a. Brayton cycle
• b. Diesel cycle
• c. Ericson cycle
• d. Rankine cycle

505. Which of the following is not a thermodynamic property?

• a. Pressure
• b. Temperature
• c. Volume
• d. Phase

506. Which of the following compressibility factor of ideal gas

• a. 1
• b. 2
• c. 1.5
• d. 0

507. What refers to the thermodynamic properties which are dependent on the amount of the substance present?

• a. Extensive property
• b. Intensive properties
• c. Reversible properties
• d. Irreversible properties

508. What refers to the thermodynamic properties which are independent on the amount of the substance present?

• a. Extensive property
• b. Intensive properties
• c. Reversible properties
• d. Irreversible properties

509. What is known as the total heat and heat content at various times in the history?

• a. enthalpy
• b. entropy
• c. internal energy
• d. latent heat

510. What is the measure of the energy that is no longer available to perform useful work within the current environment?

• a. enthalpy
• b. entropy
• c. internal energy
• d. latent heat

511. What is the temperature when water and vapor are in the equilibrium with the atmospheric pressure?

• a. Ice point
• b. Steam point
• c. Critical point
• d. Freezing point

512. What is the unique state at which solid, liquid and gaseous phase can go co-exist in equilibrium?

• a. Triple point
• b. Critical point
• c. Boiling point
• d. Pour point

513. What refers to the state at which liquid and gaseous phases are indistinguishable?

• a. Triple point
• b. Critical point
• c. Boiling point
• d. Pour point

514. What refers to the heat needed to change the temperature of the substances without changing its phases?

• a. Latent heat
• b. Sensible heat
• c. Specific heat
• d. entropy

515. What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degrees Celsius?

• a. Kilojoule
• b. Btu
• c. Kilocalorie
• d. Latent heat

516. To what conditions does a gas behave like an ideal gas?

• a. low temperature and low pressure
• b. low temperature and high pressure
• c. high temperature and low pressure
• d. high temperature and high pressure

517. What Law states that the pressure of gas is inversely proportional to its volume at constant temperature?

• a. Charles’ law
• b. Gay-Lussac’s Law
• c. Boyle’s Law
• d. Dalton’s Law

518. What do you call a system in which there is a flow of matter through the boundary?

• a. Closed system
• b. Open system
• c. Isolated system
• d. All of these

519. Which of the following best describes heat?

• a. The capacity to do work
• b. Forces times distances
• c. Sum of thermal and chemical energy
• d. An energy transfer due to temperature difference

520. The mechanical equivalent of heat is

• a. joule
• b. calorie
• c. Btu
• d. Specific heat

521. Burning of Gasoline initially requires heat before it burns spontaneously. Which of the following does not give a good explanation of this phenomenon?

• a. the initial heat rises the enthalpy of the reactant
• b. the initial heat lowers the activation of energy of the reactants
• c. the enthalpy of reactants is lower than the enthalpy of products.
• d. The enthalpy of the product is lower than the enthalpy of the reactant

522. The phenomenon of melting under pressure and freezing again when the pressure is reduced is known as

• a. sublimation
• b. condensation
• c. deposition
• d. regelation

523. Which of the following events is heat exchange involved?

• a. when there is a phase change
• b. when there is a chemical reaction
• c. when the gas expands adiabatically
• d. when there is difference in temperature

524. What is the entropy of a pure substance at a temperature of absolute zero?

• a. unity
• b. zero
• c. infinity
• d. undefined

525. What is the area under the curve on a temperature –entropy diagram?

• a. Heat
• b. work
• c. entropy
• d. volume

526. What happens to the internal energy of water at reference temperature where enthalpy is zero?

• a. Becomes negative
• b. Becomes positive
• c. Remains constant
• d. Cannot be defined

527. Which of the following is the work done for a closed reversible isometric system?

• a. negative
• b. positive
• c. zero
• d. undefined

528. If the initial volume of an ideal gas is compressed to one-half its original volume and to twice its original temperature, the pressure:

• a. doubles
• b. halves
• d. triples

529. When the expansion of compression of gas takes place without transfer of heat or from the gas the process is called;

• a. Isometric process
• b. Isothermal process
• c. Isobaric process

530. Which of the following best describes both Stirling and Ericson engines?

• a. Internal combustion engine
• b. External combustion engine
• c. Diesel cycle
• d. Rankine cycle

531. At steam point, the temperature of water and its vapor at standard pressure are:

• a. Extremes or maximum
• b. unity
• c. in equilibrium
• d. undefined

532. Who coined the word Entropy?

• a. Rudolf Clausius
• b. Lord Kelvin
• c. Gabriel Volks
• d. Rudolf Diesel

533. What is the temperature when water and vapor are in equilibrium with the atmospheric pressure?

• a. Ice point
• b. Steam point
• c. Critical point
• d. Freezing point

534. When the expansion of compression of gas takes place without transfer of heat to or from the gas the process is called

• a. reversible
• c. polytropic
• d. isothermal

535. What refers to a liquid whose temperature is lower than saturation temperature corresponding to the existing pressure?

• a. Subcooled liquid
• b. Saturated liquid
• c. Pure liquid
• d. Compressed liquid

536. Which law that states “Entropy of all perfect crystalline solids is zero at absolute zero temperature”?

• a. Zeroth law of thermodynamics
• b. First law of thermodynamics
• c. Second law of thermodynamics
• d. Third law of thermodynamics

537. A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is the partial pressure of the air in the mixture in KPa?

• a. 46.8
• b. 48.6
• c. 84.6
• d. 64.8

538. Which of the following occurs in a reversible polytrophic process?

• a. Enthalpy remains constant
• b. Internal energy does not change
• c. Some heat transfer occurs
• d. Entropy remains constant

539. The change that the system that undergoes from one equilibrium state to another is known as

• a. oath
• b. process
• c. enthalpy change
• d. entropy change

540. What refers to the series of states through which a system passes during the process?

• a. path
• b. quasi- static steps
• c. reversibility moves
• d. irreversibility moves

541. Which of the following relations is not applicable in a free expansion process?

• a. Heat is rejected to zero
• b. Work done is zero
• c. Change in temperature is zero
• d. Heat supplied is zero

542. What system in which neither mass nor energy cross the boundaries and is not influenced by the surroundings?

• a. Closed system
• b. Open system
• c. Isolated system
• d. All of these

543. What is referred to by control volume?

• a. An isolated system
• b. Closed system
• c. Fixed region in space
• d. Reversible process only

544. Which of the following is used in thermal power plant?

• a. Brayton cycle
• b. Reversed carnot cycle
• c. Rankine cycle
• d. Otto cycle

545. A Bell-Coleman cycle is a reversed of which the following cycles?

• a. Stirling cycle
• b. Joule cycle
• c. Carnot cycle
• d. Otto cycle

546. An ideal gas is compresses isothermally. The enthalpy change is

• a. Always negative
• b. Always positive
• c. zero
• d. undefined

547. The state of a thermodynamic system is always defined by its:

• a. Absolute temperature
• b. process
• c. properties
• d. temperature and pressure

548. Entropy is the measure of:

• a. The internal energy of a gas
• b. The heat capacity of a substance
• c. Randomness or disorder
• d. The change of enthalpy of a system

549. What system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries?

• a. Open system
• b. Closed system
• c. Isolated system
• d. Non-flow system

550. What refers to a system in which there is a flow of mass across its boundaries?

• a. Open system
• b. Closed system
• c. Isolated system
• d. Non-flow system

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