Which of the following is a common thermodynamic cycle used in heat engines?
a) Carnot cycle
b) Stirling cycle
c) Rankine cycle
d) All of the above
In a Carnot cycle, what is the working substance?
a) Liquid
b) Gas
c) Water
d) Steam
Which of the following is true for the Carnot cycle?
a) It operates between two temperature reservoirs
b) It is an irreversible cycle
c) It is the least efficient thermodynamic cycle
d) It does not obey the second law of thermodynamics
What is the main goal of a Rankine cycle?
a) To produce high efficiency
b) To convert heat into mechanical work
c) To refrigerate the system
d) To minimize heat loss
The Stirling cycle is a type of: a) Ideal gas cycle
b) Regenerative cycle
c) Refrigeration cycle
d) Open system cycle
In the ideal Rankine cycle, which component is responsible for converting heat to mechanical energy?
a) Boiler
b) Turbine
c) Condenser
d) Pump
Which of the following cycles is commonly used in refrigeration and air conditioning systems?
a) Brayton cycle
b) Carnot cycle
c) Rankine cycle
d) Reverse Carnot cycle
In a Carnot engine, which phase occurs at constant temperature and volume?
a) Isothermal expansion
b) Isothermal compression
c) Adiabatic expansion
d) Adiabatic compression
Which of the following statements is true for the efficiency of a Carnot cycle?
a) Efficiency depends only on the working substance
b) Efficiency depends on the temperature difference between the hot and cold reservoirs
c) Efficiency increases with the size of the engine
d) Efficiency is independent of the temperatures of the reservoirs
Which thermodynamic cycle is used in gas turbines?
a) Rankine cycle
b) Brayton cycle
c) Stirling cycle
d) Otto cycle
In the Rankine cycle, which component is responsible for compressing the working fluid?
a) Boiler
b) Turbine
c) Pump
d) Condenser
In the Stirling cycle, the working fluid is typically: a) A vapor
b) A gas
c) A liquid
d) Water
The efficiency of a heat engine is defined as the ratio of: a) Heat input to work output
b) Work output to heat input
c) Work output to heat rejected
d) Heat input to heat rejected
In a Brayton cycle, which component performs the expansion of the gas?
a) Compressor
b) Turbine
c) Pump
d) Heat exchanger
Which of the following is a feature of the ideal Carnot cycle?
a) All processes are adiabatic
b) It operates between two temperature reservoirs
c) It is an irreversible process
d) It requires a high amount of work input
In a Rankine cycle, what happens in the condenser?
a) Heat is added to the working fluid
b) The working fluid expands and does work
c) The working fluid is condensed from vapor to liquid
d) The fluid is pumped to higher pressure
What is the function of the compressor in the Brayton cycle?
a) To heat the working fluid
b) To expand the working fluid and do work
c) To compress the working fluid and increase its pressure
d) To cool the working fluid
In which cycle is the process of adiabatic expansion and compression important?
a) Carnot cycle
b) Rankine cycle
c) Stirling cycle
d) Brayton cycle
The efficiency of a Brayton cycle is primarily determined by: a) The pressure ratio
b) The temperature of the working fluid
c) The heat input
d) The temperature difference between the hot and cold reservoirs
What is the main characteristic of the ideal Stirling engine cycle?
a) It operates between two temperature reservoirs
b) It uses a regenerative heat exchanger
c) It is an open cycle system
d) It uses a liquid working fluid
In the Rankine cycle, the process of vaporizing the working fluid occurs in the: a) Pump
b) Turbine
c) Condenser
d) Boiler
The thermodynamic cycle that involves the compression and expansion of gas in a piston is called: a) Carnot cycle
b) Rankine cycle
c) Otto cycle
d) Brayton cycle
Which cycle uses both an ideal gas and a heat engine to generate mechanical work?
a) Rankine cycle
b) Brayton cycle
c) Stirling cycle
d) Carnot cycle
Which of the following cycles is used in steam engines?
a) Carnot cycle
b) Rankine cycle
c) Brayton cycle
d) Stirling cycle
The efficiency of the Carnot engine depends on: a) The type of fuel used
b) The work done by the engine
c) The temperature of the hot and cold reservoirs
d) The volume of the gas used
In an ideal heat engine, the heat added to the system is equal to: a) The work done by the system
b) The heat rejected to the surroundings
c) The change in the internal energy of the system
d) The total energy of the system
Which of the following is true for the Rankine cycle?
a) The working fluid is always gas
b) The cycle involves adiabatic processes
c) The fluid is often water or steam
d) It cannot be used in power plants
In a Carnot cycle, the temperature of the cold reservoir is denoted by: a) Tc
b) Th
c) T0
d) Ts
