CLASS SECTION/SCHEDULE (FRI-AM, FRI-PM, SAT-AM, SAT-PM, SUN-AM, SUN-PM, ONLINE)

1.

A piston–cylinder device initially contains 0.4 m3 of air at 100 kPa and 80°C. The air is now compressed to 0.1 m3 in such a way that the temperature inside the cylinder remains constant. Determine the work done during this process.

a) -50.5 kJ b) -65.5 kJ c) -55.5 kJ d) -52.5 kJ

A

B

C

D

2.

What is the meaning of “specific heat”?

a) The specific heat is defined as the energy required to raise the volume of a unit mass of a substance by one degree. b) The specific heat is defined as the energy required to raise the pressure of a unit mass of a substance by one degree. c) The specific heat is defined as the energy required to raise the temperature of a unit mass of a substance by one degree. d) The specific heat is defined as the energy required to raise the energy of a unit mass of a substance by one degree.

A

B

C

D

3.

Which statement is true?

a) Work can always be converted to heat directly and completely, but the reverse is true. b) Work can always be converted to heat directly and completely, but the reverse is not true. c) Work cannot always be converted to heat directly and completely, but the reverse is not true. d) Work cannot always be converted to heat directly and completely, but the reverse is true.

A

B

C

D

4.

Which statement is true?

a) All of the heat received by a heat engine is converted to work. b) Part of the heat received by a heat sink is converted to work. c) Part of the heat received by a heat sink is converted to work, while the rest is rejected to a reservoir. d) Part of the heat received by a heat engine is converted to work, while the rest is rejected to a sink.

A

B

C

D

5.

Which statement is true?

a) The entropy change of a system can be negative, but the entropy generation cannot. b) The entropy change of a system can never be negative, but the entropy generation can. c) The entropy change of a system can be negative as well as the entropy generation. d) The entropy change of a system can never be negative neither the entropy generation.

A

B

C

D

6.

Which statement is true?

a) Temperature difference is not the driving force for heat transfer. The smaller the temperature difference, the higher is the rate of heat transfer. b) Temperature difference is not the driving force for heat transfer. The larger the temperature difference, the higher is the rate of heat transfer. c) Temperature difference is the driving force for heat transfer. The smaller the temperature difference, the higher is the rate of heat transfer. d) Temperature difference is the driving force for heat transfer. The larger the temperature difference, the higher is the rate of heat transfer.

A

B

C

D

7.

A rigid tank contains a hot fluid that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 800 kJ. During the cooling process, the fluid loses 500 kJ of heat, and the paddle wheel does 100 kJ of work on the fluid. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel.

a) 300 kJ b) 400kJ c) 500 kJ d) 600 kJ

A

B

C

D

8.

Determine the energy required to accelerate an 800- kg car from rest to 100 km/h on a level road

a) 305 kJ b) 310 kJ c) 315 kJ d) 320 kJ

A

B

C

D

9.

Which statement is true?

a) For all adiabatic processes between two specified states of a closed system, the net work done is the same only if the nature of the closed system and the details of the process are correct. b) For all adiabatic processes between two specified states of a closed system, the net work done is not the same regardless of the nature of the closed system and the details of the process. c) For all adiabatic processes between two specified states of a closed system, the net work done is the same regardless of the nature of the closed system and the details of the process. d) No statement if correct.

A

B

C

D

10.

Determine the mass of the air in a room whose dimensions are 4 m x 5 m x 6 m at 100 kPa and 25°C.

a) 1.403 kg b) 1.403 kg c) 14.03 kg d) 140.3 kg

A

B

C

D

11.

The combustion in a gasoline engine may be approximated by a constant volume heat addition process. There exists the air–fuel mixture in the cylinder before the combustion and the combustion gases after it, and both may be approximated as air, an ideal gas. In a gasoline engine, the cylinder conditions are 1.8 MPa and 450°C before the combustion and 1300°C after it. Determine the pressure at the end of the combustion process.

a) 3700 kPa b) 3800 kPa c) 3900 kPa d) 4000 kPa

A

B

C

D

12.

A garden hose attached with a nozzle is used to fill a 10-gal bucket. The inner diameter of the hose is 2 cm, and it reduces to 0.8 cm at the nozzle exit. If it takes 50 s to fill the bucket with water, determine the mass flow rates of water through the hose.

a) 0.757 kg/s b) 7.57 kg/s c) 75.7 kg/s d) 757. kg/s

A

B

C

D

13.

In the item above, determine the average velocity of water at the nozzle exit.

a) 10 m/s b) 15 m/s c) 20 m/s d) 25 m/s

A

B

C

D

14.

Which statement is true?

a) Energy is recognized as heat transfer only as it crosses the system boundary. b) Energy is not recognized as heat transfer if it crosses the system boundary. c) Energy is recognized as heat transfer only as it crosses the system surrounding. d) No statement is true

A

B

C

D

15.

The state of a thermodynamic system is always defined by its

a) Absolute temperature

b) Process

c) Properties

d) Temperature and pressure

e) Availability

A

B

C

D

E

16.

The normal boiling point of a substance is 90 k. what is this temperature in rankine?

a) -330

b) -183

c) 162

d) 168

e) 518

A

B

C

D

E

17.

Equations of state for a single component pure substance can be any of the following except?

a) The ideal gas law

b) The ideal gas law modified by the compressibility factor

c) Any relationship interrelating 3 or more state functions

d) a mathematical expression defining a path between states

e) a mathematical expression interrelating thermodynamic properties of the material

A

B

C

D

E

18.

An adiabatic process is defined as a process in which:

a) the heat transfer is zero

b) the entropy change is zero

c) the enthalpy change is zero

d) the internal energy- change is zero

e) the volume remains constant

A

B

C

D

E

19.

The First Law of Thermodynamics states that:

a) heat energy cannot be completely transformed into work

b) internal energy is due to molecular motion

c) heat can only be transferred form a body of higher temperature to one of lower temperature

d) energy can be neither created nor destroyed

e) entropy of the universe is increased by irreversible processes

A

B

C

D

E

20.

Which of the following characteristics of any absolute or thermodynamic temperature scale is fixed by the Second Law of Thermodynamics?

a) the ice point temperature

b) the difference between the steam point and the ice point temperatures

c) the ratio of ice point to steam point temperatures

d) the nature of the thermometer substance

e) the number of degrees on the scale

A

B

C

D

E

21.

What is the absolute pressure, in SI units, of a fluid at a gauge pressure of 1.5 bar if atmospheric pressure is 1.01 bar?

a. 251 Pa

b. 261 kPa

c. 2.51 kPa

d. 251 kPa

A

B

C

D

22.

Calculate the kinetic energy of a body which has a mass of 5 kg and a velocity of 10m/s.

a. 260 J

b. 250 kJ

c. 260 kJ

d. 250 J

A

B

C

D

23.

Calculate the increase in internal energy of a gas in a closed system during a process in which -100 J of heat transfer and 400 J of work transfer take place.

a. 300 J

b. 300 kJ

c. 200 J

d. 200 kJ

A

B

C

D

24.

Calculate the change in potential energy of a mass of 5 kg when it is raised a height of 3m.

a. 152 J

b. 147 kJ

c. 147 J

d. 152 kJ

A

B

C

D

25.

Which of the following laws is applicable to the behaviour of a perfect gas?

a. Boyle’s law

b. Charles’ law

c. Gay-Lussac law

d. All of the above

A

B

C

D

26.

An object moving at constant velocity in an inertial frame must:

a) have a net force on it b) eventually stop due to gravity c) not have any force of gravity on it d) have zero net force on it

A

B

C

D

27.

Acceleration is always in the direction:

a) of the displacement b) of the initial velocity c) of the final velocity d) of the net force

A

B

C

D

28.

The inertia of a body tends to cause the body to:

a) speed up b) slow down c) resist any change in its motion d) fall toward earth

A

B

C

D

29.

Equal forces F act on isolated bodies A and B. The mass of B is three times that of A. The magnitude of the acceleration of A is:

a) three times that of B b) 1/3 that of B c) the same as B d) nine times that of B

A

B

C

D

30.

A brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it?

a) putting a second brick on top b) decreasing the surface area of contact c) increasing the surface area of contact d) decreasing the mass of the brick