# Engineering/Engineering Thermodynamics MCQs Sample Test,Sample questions

## Question: ``` If a system undergoes a reversible isothermal process without transfer of heat, the temperature at which this process takes place is called ```

1.triple point of water

2.boiling point of water

3.absolute zero

4.none of the mentioned

Posted Date:-2022-05-04 10:35:55

## Question: ``` The entropy of any closed system can increase in which of the following way? ```

1.dissipative effects or internal irreversibilities

2.by heat interaction in which there is entropy transfer

3.both of the mentioned

4.none of the mentioned

Posted Date:-2022-05-04 10:41:42

## Question: ``` Which of the following is true according to Clausius statement? ```

1.it is possible to construct a device that can transfer heat from a cooler body to a hotter body without any effect

2.it is impossible to construct a device that can transfer heat from a cooler body to a hotter body without any effect

3.it is impossible to construct a device that can transfer heat from a hotter body to a cooler body without any effect

4.none of the mentioned

Posted Date:-2022-05-04 10:32:11

## Question: ```A 5 m long vertical tube having cross sectional area 200 cm2 is placed in a water. It is filled with 15Â°C water, with the bottom closed and the top open to 100 kPa atmosphere. What is the pressure at the bottom of tube? ```

1.119 kPa

2.129 kPa

3.139 kPa

4.149 kPa

Posted Date:-2022-05-04 10:50:35

## Question: ```A car uses power of 25 hp for a one hour in a round trip. Thermal efficiency of 35% can be assumed? Find the change in entropy if we assume ambient at 20Â°C. ```

1.354.1 kJ/K

2.654.1 kJ/K

3.254.1 kJ/K

4.554.1 kJ/K

Posted Date:-2022-05-04 10:39:58

## Question: ```A cylinder/piston contains 1kg methane gas at 100 kPa, 20Â°C. The gas is compressed reversibly to a pressure of 800 kPa. WHat is the work required if the process is isothermal? ```

1.-116.0 kJ

2.-316.0 kJ

3.-216.0 kJ

4.-416.0 kJ

Posted Date:-2022-05-04 10:28:58

## Question: ```A hot metal piece is cooled rapidly to 25Â°C, removing 1000 kJ from the metal. Calculate the change of entropy if saturated liquid R-22 at âˆ’20Â°C absorbs the energy so that it becomes saturated vapor. ```

1.0.950 kJ/K

2.7.950 kJ/K

3.3.950 kJ/K

4.5.950 kJ/K

Posted Date:-2022-05-04 10:43:07

## Question: ```A large exhaust fan in a lab room keeps the pressure inside at 10 cm water relative vacuum to the hallway? What is the net force acting on the door measuring 1.9 m by 1.1 m? ```

1.2020 N

2.2030 N

3.2040 N

4.2050 N

Posted Date:-2022-05-04 10:49:40

## Question: ```A piston/cylinder contains carbon dioxide at 300 kPa, 100Â°C with a volume of 0.2 m^3. Weights are added at such a rate that the gas compresses according to the relation PV^1.2 = constant to a final temperature of 200Â°C. Find the work done during the process. ```

1.60.4 kJ

2.-50.4 kJ

3.80.4 kJ

4.-80.4 kJ

Posted Date:-2022-05-04 10:30:14

## Question: ```A refrigerator with a 2 kW motor for powering the compressor gives 6000 kJ of cooling to the refrigerated space during 30 minutes of operation in a thermally insulated kitchen. Calculate the change in internal energy of the kitchen if the condenser coil behind the refrigerator rejects 8000 kJ of heat to the kitchen over the same time period. ```

1.3600 kJ

2.2400 kJ

3.4800 kJ

4.none of the mentioned

Posted Date:-2022-05-04 10:17:14

## Question: ```At 100Â°C, a sealed rigid vessel with a volume of 1 m3 and 2 kg of water has a volume of 1 m3. The vessel has now been warmed up. What pressure should a safety pressure valve be adjusted to achieve a maximum temperature of 200Â°C if one is installed? ```

1.431.3 kPa

2.231.3 kPa

3.831.3 kPa

4.131.3 kPa

Posted Date:-2022-05-04 10:11:59

## Question: ```At 15Â°C, a steel pot with a 5 mm thick bottom is filled with liquid water (conductivity 50 W/m K). The pot has a 10 cm radius and is now placed on a stove with a heat transmission of 250 W. Calculate the temperature on the bottom of the outer pot assuming the inner surface is 15Â°C. ```

1.15.8Â°C

2.16.8Â°C

3.18.8Â°C

4.19.8Â°C

Posted Date:-2022-05-04 10:17:58

## Question: ```Fluid flow through which of the following throttles the flow? ```

1.partially opened valve

2.orifice

3.porous plug

4.all of the mentioned

Posted Date:-2022-05-04 10:22:55

## Question: ```Heat does not spontaneously flow from a colder body to a hotter one. Which of the following thermodynamics law states this? ```

1.Zeroth law of thermodynamics

2.First law of thermodynamics

3.Second law of thermodynamics

4.Third law of thermodynamics

Posted Date:-2022-05-04 10:05:36

## Question: ```Heat flow into a system is ____, and heat flow out of the system is ________ ```

1.positive, positive

2.negative, negative

3.negative, positive

4.positive, negative

Posted Date:-2022-05-04 10:18:40

## Question: ```If a piston/cylinder with a cross-sectional size of 0.01 m2 is resting on the stops, what should the water pressure be to lift the piston with an outside pressure of 100 kPa? ```

1.218kPa

2.168kPa

3.198kPa

4.318kPa

Posted Date:-2022-05-04 10:11:09

## Question: ```If heat Q flows reversibly from the system to the surroundings at To, what will be the effect on entropy? ```

1.entropy of the system is reduced by Q/To

2.system has lost entropy to the surroundings

3.entropy increase of the surroundings is Q/To

4.all of the mentioned

Posted Date:-2022-05-04 10:40:54

## Question: ```In which of the following systems does mass transfer occur across the system boundary? ```

1.isolated system

2.closed system

3.open system

4.none of the mentioned

Posted Date:-2022-05-04 10:21:18

## Question: ```Joule was the first to prove that heat is a type of energy, laying the groundwork for the fundamental law of thermodynamics. ```

1.False

2.True

Posted Date:-2022-05-04 10:19:15

## Question: ```Rate of energy increase within the control volume is given by ```

1.rate of energy inflow * rate of energy outflow

2.rate of energy inflow â€“ rate of energy outflow

3.rate of energy inflow / rate of energy outflow

4.rate of energy inflow + rate of energy outflow

Posted Date:-2022-05-04 10:24:00

## Question: ```The available energy of a system ___ as its temperature or pressure decreases and approaches that of the surroundings. ```

1.remains constant

2.increases

3.decreases

4.none of the mentioned

Posted Date:-2022-05-04 10:47:55

## Question: ```The enthalpy and internal energy are the function of temperature for ```

1.all gases

2.steam

3.water

4.ideal gas

Posted Date:-2022-05-04 10:20:38

## Question: ```The entropy change of a system between two identifiable equilibrium state is ___ when the intervening process is reversible or change of state is irreversible. ```

1.depends on the process

2.different

3.same

4.none of the mentioned

Posted Date:-2022-05-04 10:45:33

## Question: ```The entropy of an isolated system can never ____ ```

1.decrease

2.be zero

3.increase

4.none of the mentioned

Posted Date:-2022-05-04 10:39:04

## Question: ```The reversed heat engine takes heat from a ___ temperature body, then discharges it to a ___ temperature body and ___ an inward flow of the network. ```

1.high, low, gives

2.low, high, gives

Posted Date:-2022-05-04 10:35:13

## Question: ```What does (m*g*z) give? ```

1.macroscopic kinetic energy

2.microscopic kinetic energy

3.macroscopic potential energy

4.microscopic potential energy

Posted Date:-2022-05-04 10:20:00

## Question: ```What is the magnitude of mechanical work? ```

1.product of the force and distance travelled perpendicular to the force

2.product of the force and distance travelled parallel to the force

3.sum of the force and distance travelled perpendicular to the force

4.sum of the force and distance travelled parallel to the force

Posted Date:-2022-05-04 10:14:56

## Question: ```What is the relationship between Kelvin-Planckâ€™s and Clausiusâ€™ statements? ```

1.violation of one doesnâ€™t violate the other

2.not connected to each other

3.virtually two parallel statements of the second law

4.none of the mentioned

Posted Date:-2022-05-04 10:33:28

## Question: ```What is the value of the absolute thermodynamic temperature scale? ```

1.3K

2.0K

3.1K

4.4K

Posted Date:-2022-05-04 10:09:26

## Question: ```What is thermodynamics? ```

1.study of the relationship between heat and other forms of energy

2.study of the conversion of chemical energy to other forms of energy

3.study of the relationship between mechanical energy to other forms of energy

4.study of the conversion of mechanical energy to other forms of energy

Posted Date:-2022-05-04 10:03:18

## Question: ```When more than one fluid stream enters or leaves the control volume, which of the following type of balance is taken? ```

1.mass balance

2.energy balance

3.mass balance and energy balance

4.none of the mentioned

Posted Date:-2022-05-04 10:22:08

## Question: ```When the diver is 8 meters below the surface, the pressure gauge on his air tank reads 60 kPa. The gauge pressure will be 0 at what depth? ```

1.44.118 m

2.24.118 m

3.34.118 m

4.None of the mentioned

Posted Date:-2022-05-04 10:12:50

## Question: ```When work is dissipated into internal energy, what is the change in the disorderly motion of molecules. ```

1.increases

2.remains the same

3.decreases

4.none of the mentioned

Posted Date:-2022-05-04 10:46:24

## Question: ```Which of the following causes irreversibility? ```

1.electrical resistance, magnetic hysteresis

2.friction, viscosity

3.inelasticity

4.all of the mentioned

Posted Date:-2022-05-04 10:34:19

## Question: ```Which of the following follows the Carnot theorem? ```

1.Heat engines

2.Gas turbine engines

3.Gas compressors

4.All of the mentioned

Posted Date:-2022-05-04 10:10:10

## Question: ```Which of the following gives the Mechanical efficiency of the engine? ```

1.IP/BP

2.1/(BP*IP)

3.(BP*IP)

4.BP/IP

Posted Date:-2022-05-04 10:15:37

## Question: ```Which of the following is a branch of thermodynamics? ```

1.Equilibrium thermodynamics

2.Classical thermodynamics

3.Chemical thermodynamics

4.All of the mentioned

Posted Date:-2022-05-04 10:04:06

## Question: ```Which of the following is a thermodynamics law? ```

1.Zeroth law of thermodynamics

3.Ideal Gas Law of thermodynamics

4.Boyleâ€™s Law of thermodynamics

Posted Date:-2022-05-04 10:04:51

## Question: ```Which of the following is a type of thermodynamic system? ```

1.Open system

2.Closed system

3.Thermally isolated system

4.All of the mentioned

Posted Date:-2022-05-04 10:07:13

## Question: ```Which of the following is an application of thermodynamics? ```

1.Refrigerators

2.Gas compressors

3.Power plants

4.All of the mentioned

Posted Date:-2022-05-04 10:06:20

## Question: ```Which of the following is an example of low grade energy? ```

1.heat from combustion of fossil fuel

2.heat or thermal energy

3.heat from nuclear fission or fusion

4.all of the mentioned

Posted Date:-2022-05-04 10:47:10

## Question: ```Which of the following is chosen as the standard thermometric substance? ```

1.Liquid

2.Solid

3.Gas

4.None of the mentioned

Posted Date:-2022-05-04 10:14:08

## Question: ```Which of the following is known as the inequality of Clausius? ```

1.cyclic integral of dW/T<=0

2.cyclic integral of dW/T>=0

3.cyclic integral of dQ/T>=0

4.cyclic integral of dQ/T<=0

Posted Date:-2022-05-04 10:36:37

## Question: ```Which of the following is the standard fixed point of thermometry? ```

1.The steam point

2.The triple point of water

3.The ice point

4.All of the mentioned

Posted Date:-2022-05-04 10:13:30

## Question: ```Which of the following is true for a discharging tank? ```

1.the process is quasi-static

3.dQ=0

4.all of the mentioned

Posted Date:-2022-05-04 10:25:57

## Question: ```Which of the following occurs without a change in the internal energy? ```

1.Isochoric process

2.Isenthalpic process

4.Isenthalpic process

Posted Date:-2022-05-04 10:07:57

## Question: ```Which of the following properties describe entropy? ```

1.point function, intensive property

2. point function, extensive property

3.path function, extensive property

4.path function, intensive property

Posted Date:-2022-05-04 10:37:19

## Question: ```Which of the following statements are true for a mechanical energy reservoir(MER)? ```

1.all processes within an MER are quasi-static

2.it is a large body enclosed by an adiabatic impermeable wall

3.stores work as KE or PE

4.all of the mentioned

Posted Date:-2022-05-04 10:31:05

## Question: ```Which of the following thermodynamic law gives the concept of enthalpy? ```

1.First law of thermodynamics

2.Second law of thermodynamics

3.Third law of thermodynamics

4.Fourth law of thermodynamics

Posted Date:-2022-05-04 10:08:41

## Question: ```Which of the following type of motion does Shaft uses to do work? ```

1.vertical motion

2.horizontal motion

3.rotational motion

4.none of the mentioned

Posted Date:-2022-05-04 10:16:19

## More MCQS

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