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:
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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
- d. Adiabatic
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
- d. Adiabatic Saturation
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
- d. Adiabatic ratio
474. Is a steady flow process at total constant pressure through a control volume for which there is no heat?
- a. Adiabatic Saturation Process
- b. Dew point
- c. Adiabatic Ratio
- d. None of the above
475. Fuels that may classified conveniently in solid, liquid and gaseous.
- a. Unleaded fuel
- 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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