Thermodynamics

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Q. According to Bernoulli's principle, what happens to the pressure of a fluid as its velocity increases?
  • A. Pressure increases
  • B. Pressure decreases
  • C. Pressure remains constant
  • D. Pressure fluctuates
Q. During which phase of the Carnot cycle does the working substance do work on the surroundings?
  • A. Isothermal expansion
  • B. Isothermal compression
  • C. Adiabatic expansion
  • D. Adiabatic compression
Q. In a Carnot cycle, what is the efficiency dependent on?
  • A. The work done by the system
  • B. The temperatures of the hot and cold reservoirs
  • C. The type of working fluid
  • D. The pressure of the system
Q. In a Carnot cycle, what is the efficiency formula?
  • A. 1 - (T_c/T_h)
  • B. T_h/T_c
  • C. T_c/T_h
  • D. 1 + (T_c/T_h)
Q. In a Carnot cycle, what is the relationship between the temperatures of the hot and cold reservoirs?
  • A. T_hot > T_cold
  • B. T_hot = T_cold
  • C. T_hot < T_cold
  • D. T_hot + T_cold = constant
Q. In a Carnot cycle, which process is isothermal?
  • A. Heat absorption from the hot reservoir
  • B. Heat rejection to the cold reservoir
  • C. Adiabatic expansion
  • D. Adiabatic compression
Q. In a closed system, if the internal energy increases, what must happen to the heat and work?
  • A. Heat must be added or work must be done on the system
  • B. Heat must be removed or work must be done by the system
  • C. Both heat and work must be removed
  • D. Neither heat nor work affects internal energy
Q. In a Rankine cycle, what is the working fluid typically used?
  • A. Air
  • B. Water
  • C. Refrigerant
  • D. Helium
Q. In an ideal gas, what happens to the internal energy when the temperature increases?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes zero
Q. In heat transfer, what is conduction?
  • A. Transfer of heat through fluid motion
  • B. Transfer of heat through electromagnetic waves
  • C. Transfer of heat through direct contact
  • D. Transfer of heat through phase change
Q. In heat transfer, which mode does NOT require a medium?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. All require a medium
Q. In heat transfer, which mode involves the movement of fluid?
  • A. Conduction
  • B. Convection
  • C. Radiation
  • D. Insulation
Q. In the Rankine cycle, what is the working fluid typically used?
  • A. Air
  • B. Water
  • C. Refrigerant
  • D. Helium
Q. In the Rankine cycle, what is the working fluid typically?
  • A. Air
  • B. Water
  • C. Refrigerant
  • D. Helium
Q. What does the second law of thermodynamics state?
  • A. Energy is conserved
  • B. Heat cannot flow from cold to hot spontaneously
  • C. Entropy of the universe tends to increase
  • D. All processes are reversible
Q. What is the definition of entropy?
  • A. A measure of energy transfer
  • B. A measure of disorder or randomness
  • C. A measure of heat capacity
  • D. A measure of pressure
Q. What is the efficiency of a Carnot engine operating between temperatures T_h and T_c?
  • A. (T_h - T_c) / T_h
  • B. 1 - (T_c / T_h)
  • C. T_c / T_h
  • D. T_h / T_c
Q. What is the main advantage of using a Carnot engine?
  • A. It operates at maximum efficiency
  • B. It is easy to construct
  • C. It requires no fuel
  • D. It can operate in any environment
Q. What is the main function of a heat exchanger?
  • A. To increase the temperature of a fluid
  • B. To transfer heat between two or more fluids
  • C. To convert thermal energy into mechanical energy
  • D. To store thermal energy
Q. What is the maximum efficiency of a Carnot engine operating between two heat reservoirs at temperatures T_H and T_C?
  • A. 1 - T_C/T_H
  • B. T_H/T_C
  • C. T_H - T_C
  • D. T_C/T_H
Q. What is the maximum efficiency of a Carnot engine operating between two temperatures?
  • A. 100%
  • B. Depends on the working fluid
  • C. 1 - (T_c/T_h)
  • D. 1 - (T_h/T_c)
Q. What is the primary function of a heat exchanger?
  • A. To store heat
  • B. To transfer heat between two or more fluids
  • C. To generate electricity
  • D. To cool a fluid
Q. What is the primary mechanism of heat transfer in conduction?
  • A. Movement of fluid
  • B. Direct contact of particles
  • C. Radiation of energy
  • D. Phase change
Q. What is the primary purpose of a heat engine?
  • A. To convert heat into work.
  • B. To convert work into heat.
  • C. To increase the temperature of a substance.
  • D. To store thermal energy.
Q. What is the primary purpose of a heat exchanger?
  • A. To increase temperature
  • B. To transfer heat between two fluids
  • C. To convert heat to work
  • D. To store thermal energy
Q. What is the primary purpose of the Rankine cycle?
  • A. To convert thermal energy into mechanical work
  • B. To increase the entropy of a system
  • C. To cool a substance
  • D. To condense steam
Q. What is the relationship between heat transfer and temperature difference in heat transfer basics?
  • A. Heat transfer is independent of temperature difference.
  • B. Heat transfer increases with temperature difference.
  • C. Heat transfer decreases with temperature difference.
  • D. Heat transfer is constant regardless of temperature difference.
Q. What is the second law of thermodynamics concerned with?
  • A. Conservation of energy
  • B. Direction of heat transfer
  • C. Work done by a system
  • D. Temperature changes
Q. What is the second law of thermodynamics primarily concerned with?
  • A. Conservation of energy
  • B. Direction of heat transfer
  • C. Work done by a system
  • D. Temperature of a system
Q. What is the significance of the Carnot cycle in thermodynamics?
  • A. It is the most efficient cycle possible.
  • B. It is a practical engine design.
  • C. It operates at constant pressure.
  • D. It uses a real gas.
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