# MCQ in Thermodynamics Part 10 | ECE Board Exam

(Last Updated On: February 22, 2020) This is the Multiples Choice Questions Part 10 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 10: MCQs from Number 451 – 500                Answer key: PART X

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

Choose the letter of the best answer in each questions.

451. The pressure of the confined gas is held constant, the volume directly proportional to the absolute temperature.

• a. Charle’s Law
• b. Boyle’s Law
• c. Zeroth Law
• d. Gas Law

452. Regardless of the process, the change in enthalpy firm moles of ideal gas is

• a. Heat
• b. Enthalpy
• c. Entropy
• d. Density

453. Ideal process are ________ process

• a. Irreversible
• b. Reversible
• c. Isothermal
• d. Isometric

454. A state occurs when a system is in equilibrium

• a. Natural Environment
• b. Closed System
• c. Surrounding
• d. Isentropic

455. A state occurs in isentropic process

• a. The change in entropy is 0
• b. The change in entropy is 1
• c. The change in enthalpy is 0
• d. The change in enthalpy is 1

456. The SI unit of mass

• a. kg
• b. g
• c. N
• d. None of the above

457. Anything that is outside the system boundary is called ________.

• a. Surrounding
• b. Natural Environment
• c. Closed System
• d. Open System

458. A Thermodynamic Term That refers to any fixed region in a space

• a. Control Volume
• b. Volume
• c. Density
• d. Natural Gas

459. The process that has no heat transfer

• a. Density
• b. Isentropic Process
• c. Isometric Process

460. Another name of reversible adiabatic process

• a. Isentropic Process
• b. Isometric Process
• c. Isobaric Process
• d. Isothermal Process

461. ______ of a Body is the absolute quantity of a matter in it.

• a. Mass
• b. Weight
• c. Density
• d. Volume

462. _______ of a body means the force of the gravity Fg on the body

• a. Mass
• b. Weight
• c. Density
• d. Volume

463. The law of conservation of mass states that ______.

• a. mass is indestructible
• b. mass is destructible
• c. mass is indestructible
• d. none of the above

464. __________ is the energy stored within a body or substance by virtue of the activity and configuration of its molecules.

• a. Internal Energy
• b. External Energy
• c. Kinetic Energy
• d. Potential Energy

465. The Product of the displacement of the body and the component if the force in the direction of the displacement.

• a. Nonflow Work
• b. Flow Work
• c. Work
• d. None of the above

466. Is the energy in transit (on the move) from the one body or system to another solely because of a temperature between the bodies or systems.

• a. Work
• b. Heat
• c. Energy
• d. None of the above

467. A classification of a system in which mass crosses its boundaries.

• a. Closed System
• b. Open System
• c. Isolated System
• d. None of the above

468. The SI unit of pressure

• a. Pa
• b. N
• c. J
• d. None of the above

469. The volume of a confined gas is held constant, the pressure is directly proportional to the absolute temperature.

• a. Charle’s Law
• b. Boyle’s Law
• c. Joule’s Law
• d. Specific Heat

470. The compression of the gas in two or more cylinders in place of a single cylinder compressor

• a. Single Staging
• b. Double Staging
• c. Multistaging
• d. None of the above

471 Is define as the ratio of the actual pressure of the vapor

• a. Relative Humidity
• b. Humidity Ratio
• c. Dew Point

472. Heat engine deriving its power from the energy liberated by the explosion of a mixture of some hydrocarbon, in a gaseous or vaporized form.

• a. Dual Combustion Engine
• b. Internal Combustion Engine
• c. External Combustion Engine
• d. None of the above

473. Also called absolute humidity and specific humidity.

• a. Related humidity
• b. Humidity ratio
• c. Dew point

474. Is a steady flow process at total constant pressure through a control volume for which there is no heat?

• b. Dew point
• d. None of the above

475. Fuels that may classified conveniently in solid, liquid and gaseous.

• b. Diesel fuel
• c. Fossil fuel
• d. All of the above

476. Is a general name, without specific meaning unless the way in which it is measured or define by the context.

• a. Natural Value
• b. Heating Value
• c. Burning Value
• d. Internal Value

477. Is the force of gravity on unit volume?

• a. Specific Weight
• b. Specific Heat
• c. Specific Pressure
• d. Specific Volume

478. Give a reading as the length of some liquid column: water, alcohol, etc.

• a. Banometer
• b. Nanometer
• c. Thermometer
• d. Manometer

479. If any one or more properties of a system change, the system is said to have undergone a _______.

• a. Cycle
• b. System
• c. Process
• d. None of the above

480. Is a thermodynamic system that operates continuously with only energy (heat and work) crossing its boundaries?

• a. Heat Engine
• b. Heat Reservoir
• c. Heat Source
• d. Heat Sink

481. _______________ is the temperature at which liquids start to boil or the temperature at which vapors begin to condense.

• a. Saturation Temperature
• b. Sub cooled Liquid
• c. Compressed Liquid
• d. Saturated Liquid

482. ________________ is one which has a temperature lower than the saturation temperature corresponding to the existing pressure.

• a. Saturation Temperature
• b. Sub cooled Liquid
• c. Compressed Liquid
• d. Saturated Liquid

483. _________________ is one which has a pressure higher than the saturation pressure corresponding to the existing temperature.

• a. Saturation Temperature
• b. Sub cooled Liquid
• c. Compressed Liquid
• d. Saturated Liquid

484. __________________ is a liquid at the saturations which has temperature equal to the boiling point corresponding to the existing pressure.

• a. Saturation Temperature
• b. Sub cooled Liquid
• c. Compressed Liquid
• d. Saturated Liquid

485. __________________ is the name given to a gaseous phase that is in contact with the liquid phase, or that is in the vicinity of a state where some of it might be condensed.

• a) Vapor
• b) Saturated Vapor
• c) Superheated Vapor
• d) Wet Vapor

486. ___________________ is a vapor at the saturation conditions (saturation temperature and saturation pressure).

• a) Vapor
• b) Saturated Vapor
• c) Superheated Vapor
• d) Wet Vapor

487. ___________________ is a vapor having a temperature higher than the saturation temperature corresponding to the existing pressure.

• a) Vapor
• b) Saturated Vapor
• c) Superheated Vapor
• d) Wet Vapor

488. __________________ is a combination of saturated vapor and saturated liquid.

• a) Vapor
• b) Saturated Vapor
• c) Superheated Vapor
• d) Wet Vapor

489. ___________________ represents the highest pressure and highest temperature at which liquid and vapor can coexist in equilibrium.

• a) Critical Point
• b) Boiling Point
• c) Quality Point
• d) None of the above

490. Heat that cause change in temperature at without a change in phase.

• a) Sensible Heat
• b) Latent Heat
• c) Thermo Heat
• d) None of the above

491. Heat that cause change in phase without a change in temperature.

• a) Sensible Heat
• b) Latent Heat
• c) Thermo Heat
• d) None of the above

492. What is the formula to convert °C to °F?

• a) °F = °C + 273
• b) °F = 5/9 (°C – 32)
• c) °F = 9/5 (°C)+32
• d) None of the above

493. What is the formula to convert °F to °C?

• a) °C = °F + 273
• b) °C = 5/9 (°F – 32)
• c) °C = 9/5 (°F)+32
• d) None of the above

494. ______________ is the base unit of thermodynamics temperature.

• a) Celsius
• b) Fahrenheit
• c) Kelvin
• d) None of the above

495. __________ is the unit of force.

• a) Newton
• b) Pascal
• c) Hertz
• d) Joule

496. __________ is the unit of pressure and stress.

• a) Newton
• b) Pascal
• c) Hertz
• d) Joule

97. _____________ is the difference between the actual temperature of superheated vapor and the saturation temperature for the existing pressure.

• a) Degrees of Superheat, °SH
• b) Degrees of Sub cooled, °SB
• c) Both a and b
• d) None of the above

498. ____________is the difference between the saturation temperature for the given pressure and the actual sub cooled liquid temperature.

• a) Degrees of Superheat, °SH
• b) Degrees of Sub cooled, °SB
• c) Both a and b
• d) None of the above

499. ___________ is the percent by weight that is saturated vapor.

• a) Quality, x
• b) Percent Moisture, y
• c) Vapor
• d) Liquid

500. ____________ is the percent by weight that is saturated liquid.

• a) Quality, x
• b) Percent Moisture, y
• c) Vapor
• c) Liquid

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