PIPE 1

Devices for converting heat transfer to work are called
a. Piston cylinder
b. Heat Pumps
c. Heat engines
d. Carnot engines

Use to measure the performance of the engine is
a. efficiency
b. ratio
c. effectiveness
d. COP

Internal combustion use the ignition of combustible fuel within the engine itself as the source of energy which is partially converted into
a. potential
b. kinetic
c. work
d. heat

Heat is transferred during _____in Carnot cycle
a. isothermal process
b. isentropic process
c. isobaric process
d. adiabatic process

During the isentropic compression of Carnot cycle the pressure
a. decreases
b. increases
c. remains constant
d. none of these

During the isentropic expansion of Carnot cycle the pressure
a. decreases
b. increases
c. remains constant
d. none of these

The temperature during the heat rejection in Carnot cycle is kown as
a. temperature source
b. temperature sink
c. temperature maximum
d. temperature crest

The efficiency of Carnot cycle depends mainly in
a. absolute temperature
b. isentropic expansion
c. isentropic expansion
d. temperature ranges

The net area under T-s diagram of Carnot cycle is
a. Heat
b. Energy
c. Work
d. Entropy

Mean effective pressure is the ratio of Net work and
a. mean volume
b. volume displacement
c. volume difference
d. control volume

A Carnot cycle has two isothermals and two
a. polytropic processes
b. isentropic processes
c. adiabatic process
d. irreversible process

Stirling cycle uses a ____as working fluids
a. incompressible gas
b. incompressible fluids
c. compressible refrigerant
d. compressible fluids

Stirling cycle has two isothermals and two constant
a. volume process
b. pressure pricess
c. temperature process
d. entropy process

In Stirling the heat is added during
a. isobaric process
b. isentropic process
c. isothermal process
d. heat process

A chamber containing wire or ceramic mesh or fine metallic gauze and is used for the temporary storage of
a. power
b. energy
c. work
d. air

The energy stored and released by the regenerator is known as
a. kinetic energy
b. Potential energy
c. internal energy
d. Heat energy

The efficiency of stirling cycle is the same as that of _______efficiency
a. Brayton cycle
b. Ericsson cycle
c. Gasoline cycle
d. Carnot cycle

The Ericsson cycle has two isothermals and two constant
a. isentropic process
b. reversible process
c. adiabatic process
d. pressure process

The heat exchanger used in an Ericsson cycle is known as
a. Reheater
b. Boiler
c. Heat exchanger
d. Recuperator

The energy exchange process in Ericsson cycle takes place during
a. isothermal process
b. isobaric process
c. isometric process
d. isentropic process

The greatest net work output per cycle in Stirling cycle is obtained with the smallest pressure ratio across the turbine

the greatest volumetric expansion ratio and operating at the highest temperature at
a. turbine inlet
b. turbine outlet
c. reheater inlet
d. reheater outlet

Brayton cycle is also known as
a. carnot cycle
b. joule cycle
c. diesel cycle
d. rankine cycle

The heat in Brayton cycle is added during
a. isothermal process
b. steady flow process
c. any process
d. isobaric process

The brayton cycle has isobaric and two
a. adiabatic process
b. isothermal process
c. isentropic process
d. none of these

The efficiency of the closed-cycle brayton engine is found to depend on the
a. temperature only
b. pressure ratio only
c. volume only
d. entropy only

If the inlet pressure to the turbine increases the inlet temperature to the turbine will also
a. increase
b. decrease
c. remains constant
d. none of these

Higher inlet pressure and temperature to turbine as well as a larger temperature ratio resulting from greater heat transfer per cycle _____.
a. will decrease mean effective pressure
b. wil decrease work
c. will increase the mean effective pressure
d. will increase work

The________is the ratio of compressor work input to the turbine work output
a. heat ratio
b. specific heat ratio
c. energy ratio
d. work ratio

As the work ratio approaches unity the net work output of the Brayton engine approaches
a. zero
b. infinity
c. maximum value
d. none of these

If the turbine and/or compressor efficiency becomes low enoughthe efficiency of the cycle can become zero and the work ratio can exceed ______in Gas turbine
a. infinity
b. zero
c. unity
d. negative

A recuperation can_____ of Brayton
a. hinder efficiency
b. improve the efficiency
c. limit the efficiency
d. minimize the efficiency

The total energy of the gas leaving the turbine is minimized so that the turbine work output is
a. maximized
b. minimized
c. zero
d. infinity

Is applied to propulsion of vehicles because of certain practical characteristics
a. Diesel cycle
b. Otto cycle
c. Carnot cycle
d. Brayton cycle

The______has the general advantage of being able to burn fuels that requires little refining and of having fe moving parts
a. automotive gas-turbine engine
b. turbo-engine
c. CAD engine
d. none of these

Aircraft Brayton cycle engine is also known as
a. Turbo jet
b. Propjet
c. Fighter jet
d. Bomb jet

Is commonly used in stationary power plants
a. Carnot cycle
b. Three cycle
c. Brayton cycle
d. Diesel cycle

Otto cycle has two constant volume and two
a. polytropic process
b. adiabatic process
c. isothermal process
d. isentropic process

The heat added in Otto cycle is during
a. constant temperature process
b. constant volume process
c. heating process
d. none of these

The efficiency of Otto cycle is dependent on the __________only
a. temperature ratio
b. expansion ratio
c. cut-off ratio
d. compression ratio

Exhaust stroke of gasoline engine is also known as
a. supercharging
b. scavenging
c. turbocharging
d. charging

Under steady operation, the mass flow rate of each fluid stream flowing through a heat exchanger

a. increase
b. decrease
c. remains constant
d. none of these

Heat exchangers typically involve
a. no work interactions
b. no heat interactions
c. no energy interactions
d. none of these

When the entire heat exchanger is selected as control volume heat becomes
a. zero
b. maximum
c. infinity
d. none of these

If the process involved changes within the control volume with time is called
a. transient flow process
b. variable process
c. control process
d. none of these

A process will not occur unless
a. it satisfies the first and the second laws of thermodynamics
b. it satisfies the second and third law of thermodynamics
c. it satisfies zeroth law of thermodynamics
d. none of these

The_______is also used in determining the theoretical limits for the performance of commonly used engineering systems
a. First law if thermodynamics
b. Zeroth law of thermodynamics
c. Second law of thermodynamics
d. none of these

Thermal energy capacity is the product of
a. mass and specific volune
b. mass and specific heat
c. pressure and temperature
d. none of these

A two phase system can be modeled as a reservoir also since it can absorb and release large quantities of heat while remaining at
a. constant temperature
b. constant volume
c. constant pressure
d. none of these

A reservoir that supplies energy in the form of heat is called a
a. sink
b. source
c. reserve
d. none of these

A reservoir that absorbs energy in the form of heat is called
a. sink
b. source
c. reserve
d. none of these

Thermal energy reservoir that supplies energy in the form of heat is called
a. work reservoir
b. energy reservoir
c. heat reservoir
d. none of these

A device that is used to convert the heat to work is called
a. adiabatier
b. regenerator
c. heat engines
d. none of these

Heat engine rejects heat to a
a. low temperature sink
b. high temperature source
c. medium temperature
d. none of these

The work producing device that best fits into the definition of a heat engine is the
a. Hydroelectric power plant
b. nuclear power plant
c. Steam power plant
d. none of these

The net work output of a heat engine is always ________
a. less than the amount of heat input
b. more than the amount of heat input
c. less than the amount of heat output
d. none of these

The fraction of the heat input that is converted to net work output is a measure of the performance of a heat engine and is called the
a. thermal efficiency
b. adiabatic efficiency
c. effectiveness of second law
d. none of these

Is the ratio of desired output over the required input
a. ratio
b. requirement
c. performance
d. none of these

Is the ratio of net work output and the total heat input
a. Thermal efficiency
b. backwork ratio
c. work ratio
d. none of these

The thermal efficiency of a heat engine is always
a. the same
b. more than 1
c. less than unity
d. none of these

In a steam power plant the device where large quantities of waste heat is rejected
a. to the sea
b. to rivers, lakes, or the atmosphere
c. to culverts
d. none of these

The energy that cannot be recycled and it is properly called
a. reserve energy
b. acquired energy
c. waste energy
d. none of these

Statement states that it is impossible for any device that operates on a cycle to receive heat from a single reservoir and produce a net amount of work
a. Planc
b. Clausius
c. Kelvin-Planc
d. none of these

The transfer of heat from a low-temperature medium to a high temperature one requires special devices called
a. heat pump
b. refrigerators
c. heat exchanger
d. none of these

The working fluid used in the refrigeration cycle is called
a. medium
b. steam
c. refrigerant
d. none of these

The efficiency of refrigerator is expressed in terms of the
a. efficiency
b. power
c. coefficient of performance
d. none of these

The objective of refrigerator is
a. to remove heat from the refrigerated space
b. to remove heat feom the condenser
c. to add heat from the refrigerated space
d. none of these

The device that transfers from a low temperature medium to a high temperature one is
a. heat reservoir
b. abatior
c. heat pump
d. none of these

The objective of a heat pump is to maintain a heated space at
a. low temperature
b. high temperature
c. medium temperature
d. none of these

Are basically refrigerators whose refrigerated space is a room or a building instead of the food compartment.
a. cooling tower
b. humidifier
c. air conditioners
d. none of these

A__________cools a room by absorbing heat from the room air and discharging it to the outside
a. centralized air-conditioning unit
b. individual unit
c. window air conditioning unit
d. none of these

EER means
a. Energy Efficiency Rating
b. Energy Efdiciency Right
c. Efficiency Entrance Ratio
d. none of these

Is the amount of heat removed from the cooled space in Btu's 1 W-hr of electricity consumed
a. COP
b. Energy efficiency rating
c. efficiency
d. none of these

most air conditioning have EER between
a. 8 and 12
b. 6 and 8
c. 10 and 14
d. none of these

States that it is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a lower temperature to a higher temperature body
a. Clausius statement
b. Planc statement
c. Kelvin-Planc statement
d. none of these

A device that violates the first law of thermodynamics is called a
a. perpetual motion machine of the second kind
b. perpetual motion machine of the third kind
c. perpetual motion machine of the first kind
d. none of these

A device that violates the second law of thermodynamics is called a
a. perpetual motion machine of the second kind
b. perpetual motion machine of the third kind
c. perpetual motion machine of the first kind
d. none of these

A________is a process which can be reversed without leaving any trace on the surroundings.
a. irreversible process
b. reversible process
c. adiabatic process
d. none of these

The factors that causes a process to be irreversible are called
a. irreversibilities
b. reversibilities
c. activities
d. none of these

Any friction that involves friction is
a. reversible
b. irreversible
c. steady
d. none of these

The heat transfer process becomes less and less irreversible as the temperature difference between two bodies
a. approaches zero
b. approachea infinity
c. approaches maximum value
d. none of these

A process is called ______ if no irreversible occur within the boundaries of the system during the process.
a. internally reversible
b. internally irreversible
c. cyclic process
d. none of these

A process is called _______if no irreversibilities occur outside the system boundaries during the process
a. externally reversible
b. internally reversible
c. reversible
d. none of these

The efficiency of an irreversible heat engine ________ of a reversible one operating between two reservoirs
a. is always more than the efficiency
b. is always less than the efficiency
c. is always equal the efficiency
d. none of these

The efficiency of all reversible heat engines operating between the same two reservoirs
a. differ
b. are the same
c. are unequal
d. none of these

A temperature scale that is independent of the properties of the substance that are used to measure temperature is called
a. a thermodynamic volume scale
b. a thermodynamic temperature scale
c. a thermodynamic pressure scale
d. none of these

The triple point temperature is 273.16K. Most work producing devices in operation have efficiencies under _______
a. 30%
b. 50%
c. 40%
d. none of these

The thermal efficiency of actual heat engines can be ______by supplying heat to the engine at the highest possible engine at the lowest possible temperature
a. maximized
b. minimized
c. zero
d. none of theae

Heat transfer to a system will increase the entropy of that system whereas heat transfer from the system will
a. increase
b. decrease
c. remains constant
d. none of these

The energy change of a closed system equals the ______for any process whereas the entropy change of a closed system equals the entropy transfer only for a reversible process
a. energy transfer
b. heat transfer
c. work transfer
d. none of these

Energy is transmitted in the form of ______whereas entropy is transferred only with heat
a. heat or work
b. energy
c. power
d. none of these

An energy interaction which is accomplished by entropy transfer is
a. work transfer
b. energy transfer
c. heat transfer
d. none of these

An energy interaction which is not accompanied by entropy transfer is
a. energy
b. heat
c. work
d. none of these

The entropy transfer for adiabatic system is
a. zero
b. one
c. maximum
d. none of these

Is generated during an irreversible process
a. entropy
b. enthalpy
c. pressure
d. nobe of these

Total entropy change associated with a process must be
a. maximum
b. negative
c. positive or zero
d. none of these

The entropy change of a buffer zone will be
a. zero
b. one
c. infinity
d. none of these

Heat transfer to a system increases the entropy of that system and heat transfer from a system
a. increase
b. decrease
c. remains constant
d. none of these

Irreversibilities cause entropy to
a. increase
b. decrease
c. remains constant
d. none of these

If the process involves no heat transfer the entropy of a fixed mass must_______during that process
a. increase
b. decrease
c. remain constant
d. none of these