You dont have javascript enabled! Please enable it! MCQ in Thermodynamics Part 6 | ECE Board Exam

# MCQ in Thermodynamics Part 6 | ECE Board Exam

This is the Multiple Choice Questions Part 6 of the Series in Thermodynamics as one of the General Engineering and Applied Sciences (GEAS) topics. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize yourself with each and every questionย compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field, Thermodynamics Books, Journals, and other Thermodynamics References.

Continue Practice Exam Test Questions Part 6 of the Series

Choose the letter of the best answer in each question.

251. If the Kelvin temperature of an ideal gas is doubled, what happens to the rms speed of the molecules in the gas?

A. it increases by a factor of square root of 2

B. it increases by a factor of 2

C. it increases by factor of 4

D. none of the above

Explanation:

252. A function of state that is associated with disorder in the system and environment.

A. enthalpy

B. entropy

C. law of diminishing return

D. Lenzโ Law

Explanation:

253. No volume changes occur during this type of process

A. Isobaric process

B. Isomillimetric process

C. Isocaloric process

D. Isochoric process

Explanation:

254. The boiling of water into steam in an open container is an example of a/an _________ process.

B. isochoric

C. isobaric

D. zero work

Explanation:

255. When liquid water is converted to steam at 100หC, the entropy of water

A. increases

B. decreases

C. remains the same

D. none of the above

Explanation:

256. Only energy can cross the boundaries.

A. Closed system

B. Open system

C. Isolated system

D. Isoenergetic system

Explanation:

257. The temperature at which the vapor pressure exactly equals one atm is called _________.

A. boiling temperature

B. normal boiling point

C. triple point

D. point of infliction

Explanation:

258. Mixture of liquid and steam of the same substance in which both are at saturation temperature.

A. dry steam

B. current steam

C. wet steam

D. aerosol

Explanation:

259. The term _________ is traditionally used to describe steam issuing from condensate receiver vents and open-ended condensate discharge lines from steam traps.

A. dry steam

B. wet steam

C. phase steam

D. flash steam

Explanation:

260. Defined as the ratio of weight of dry steam to the weight of stuff.

A. dryness fraction

B. Vaporization

C. fusion

D. super heated steam

Explanation:

261. What device measures infrared radiation below?

A. thermocouple

B. thermopile

C. thermodynamic device

D. thermos

Explanation:

262. When an object undergoes thermal expansion,

A. any holes in the object expand as well

B. any holes in the object remain the same

C. mass increases

D. molecular activities would cease

Explanation:

263. _________ is the quantity of heat required to raise the temperature of one pound of water 1 Fยฐ from 63ยฐF to 64ยฐF.

A. one Joule

B. one calorie

C. one watt

D. one BTU

Explanation:

264. Boiling temperature of a material is dependent on its _________.

A. volume

B. power

C. heat

D. pressure

Explanation:

265. Thermos was invented by _________.

A. Sir Arthur Conan Doyle

B. Sir Fredrich the Great

C. Thomas Edison

D. Sir James Dewar

Explanation:

266. Most cooking activities involve _________ process.

A. Isochoric

B. Isothermal

C. Isobaric

D. Isovolumic

Explanation:

267. Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.

A. raising the temp and lowering the temp

B. maintaining the pressure and changing the temperature

C. decreasing the volume and increasing the pressure

D. lowering the temp and raising the temp

Explanation:

268. The statement โheat cannot by itself flow from one body into a hotter bodyโ is governed by _________.

A. the first law of thermodynamics

B. the second law of thermodynamics

C. the third law of thermodynamics

D. the zeroth law of thermodynamics

Explanation:

269. It is impossible for any process to have as its sole result the transfer of heat from a cooler to a hotter body

A. Carnotโs statement

B. Clausius statement

C. Rankine statement

D. Gauss statement

Explanation:

270. _________ is the average distance a molecule moves before colliding with another molecule.

A. mean free path

B. path allowance

C. compacting factor

D. molecular space

Explanation:

271. Find the pressure due to a column of mercury 74.0 cm high.

A. 91.80 x 10^3 N/m^2

B. 73.56 x 10^2 N/m^2

C. 9.86 x 10^4 N/m^2

D. 87.2 x 10^4 N/m^2

Explanation:

272. Roughly what is the total weight of air in the entire earth?

A. 1 x 10^5 tons

B. 2 x 10^6 tons

C. 6 x 10^15 tons

D. 8 x 10^10 tons

Explanation:

273. _________ is defined as that equivalent to the pressure due to a column of mercury 76cm long.

A. surface pressure

B. gage pressure

C. standard atmospheric pressure

D. isobaric pressure

Explanation:

274. If any external pressure is applied to a confined fluid, the pressure will be increased at every point in the fluid by the amount of the external pressure is known as _________.

A. Torricelliโs law

B. Barometric law

C. Newtonโs Second law

D. Pascalโs law

Explanation:

275. What type of pressure cannot be used for Boyleโs Law?

A. Atmospheric Pressure

B. Gauge Pressure

C. Surface Pressure

D. Isobaric Pressure

Explanation:

276. To displace a cubic foot of fresh water, you need _________ force.

A. 62.4 lb

B. 9.81 lb

C. 76 lb

D. 760 lb

Explanation:

277. The force per unit length across such a line in the surface is called _________.

A. force per length

B. surface tension

C. Pressure

D. Density

Explanation:

278. The speed at which a liquid escapes from a vessel through an orifice is given by _________.

A. Archimedes Principle

B. Evangelistaโs Law

C. Torricelliโs Theorem

D. Bernoulliโs Equation

Explanation:

279. The process of one substance mixing with another because of molecular motion is called _________.

A. diffusion

B. viscosity

C. streamline flow

D. solution

Explanation:

280. When was the Ninth General Conference on Weights and Measures decided to abandon centigrade and used Celsius Instead?

A. 1950

B. 1936

C. 1957

D. 1948

Explanation:

281. _________ is the temperature to which the air must be cooled, at constant pressure, to produce saturation.

A. relative humidity

B. triple point temperature

C. dew point

D. critical point

Explanation:

282. _________ is a succession of changes that ends with the return of the body or system to its initial state.

A. process

B. system

C. equilibrium

D. cycle

Explanation:

283. Intensive properties of a system are called _________.

A. Bulk Properties

B. Innate Properties

C. Natural Properties

D. Inside Properties

Explanation:

284. In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state.

A. Rankine Process

B. Carnot Cycle

C. Joule-Thomson process

D. Refrigeration process

Explanation:

285. Gasoline and Diesel Engines are best described by the _________.

A. Otto Cycle

B. Burnign Cycle

C. Shikki Cycle

D. Shapa Rโ Elli Cycle

Explanation:

286. Twenty grams of ice at 0ยฐC melts to water at 0ยฐC. How much does the entropy of the 20 g change in this process?

A. 30.5 J/K

B. 24.6 J/K

C. 21.3 J/K

D. 15.7 J/K

Explanation:

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

A. conservation of mass

B. the enthalpy-entropy relationship

C. action โ reaction

D. conservation of energy

Explanation:

288. If a system absorbs 500 cal of heat at the same time does 400J of work, find the change in internal energy of the system.

A. 1400 J

B. 1700 J

C. 1900 J

D. 1500 J

Explanation:

289. A gas is enclosed in a cylinder with a weighted piston as the top boundary. The gas is heated and expands from a volume of 0.04 m3 to 0.10 m3 at a constant pressure of 200 kPA. Find the work done on the system.

A. 5 kJ

B. 15 kJ

C. 10 kJ

D. 12 kJ

Explanation:

290. A simple steam engine receives steam from the boiler at 180ยฐC and exhausts directly into the air at 100ยฐC. What is the upper limit of its efficiency?

A. 11.28%

B. 36.77%

C. 20.36%

D. 17.66%

Explanation:

291. Heat which causes a change in temperature of a substance.

A. Latent heat

B. Sensible heat

C. Specific heat

D. Heat of Fusion

Explanation:

292. Who coined the term latent heat?

A. John Thompson

B. Studey Baker

C. Joe di Maggio

D. Joseph Black

Explanation:

293. Which of the following cannot be measured by a thermometer?

A. Latent Heat

B. Sensible Heat

C. Specific Heat

D. Heat of Fusion

Explanation:

294. It is generally accepted as a law of nature that although one may closely approach 0 Kelvin it is impossible actually to reach it.

A. First Law of thermodynamics

B. Second Law of thermodynamics

C. Third Law of thermodynamics

D. Zeroth Law of thermodynamics

Explanation:

295. One calorie is equal to _________.

A. 1/180 W.h

B. 1/860 W.h

C. 1/360 W.h

D. 1/250 W.h

Explanation:

296. A _________ is a reversible process in which there is transfer of heat and takes place according to the relation pVn = C where n is any constant.

A. Polytropic process

B. Entropy

C. Ideal Gas Law

D. Carnot Cycle

Explanation:

297. The flow through an open system is _________ if all properties at each point within the system remain constant with respect to time.

A. streamline flow

C. constant flow

D. algebraic flow

Explanation:

298. The most efficient cycle that can operate between two constant temperature reservoir is the _________.

A. Otto Cycle

B. Lazare Cycle

C. Isothermal Cycle

D. Carnot Cycle

Explanation:

299. The flow energy of 150 L of a fluid passing a boundary to a system is 110 kJ. Determine the pressure at this point

A. 733.33 kPa

B. 833.33 kPa

C. 933.33 kPa

D. 633.33 kPa

Explanation:

300. Who is the father of thermodynamics?

A. Lazare Carnot

C. William Thompson

D. Rudolf Classius

Explanation:

### Complete List of MCQs in General Engineering and Applied Science per topic

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