What term refers to process that do not involve heat transfer?

What term refers to process that do not involve heat transfer?
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Last Answer :  It is the balance between incoming and outgoing radiation

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The food chain refers to the transfer of energy from : (1) the interior of the earth to the surface (2) lower to higher latitudes (3) one organism to another (4) organisms of the land to those of the sea by means of river

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Last Answer : one organism to another

Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of- (1) Convection only (2) Conduction and convection only (3) Radiation and convection only (4) Convection, conduction and radiation

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Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles (C) S.I. unit of fouling factor is Watt/m2 .°K (D) Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

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Pick out the wrong statement. (A) In case of heat transfer by purely forced convection, GR /Re 2 ≤ 1 (B) The equivalent diameter of heat transfer for a duct of square cross￾section (having each side as 'x') is equal to 4x (C) Distillation process is not the same as evaporation (D) The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface

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In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of (A) Concentrations (B) Chemical potentials (C) Activity co-efficients (D) Mass transfer co-efficients

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Last Answer : (A) Concentrations

The second law of thermodynamics states that (A) The energy change of a system undergoing any reversible process is zero (B) It is not possible to transfer heat from a lower temperature to a higher temperature (C) The total energy of system and surrounding remains the same (D) None of the above

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Last Answer : (D) None of the above

When an isolated thermodynamic system executes a process, (A) Work is done (B) Heat transfer takes place (C) Mass flow occurs across the boundary of the system (D) No chemical reaction takes place within the system

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Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process

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Last Answer : (B) Non-heat transfer process

Which of the following occurs in a reversible polytrophic process?  a. Enthalpy remains constant  b. Internal energy does not change  c. Some heat transfer occurs  d. Entropy remains constant

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Last Answer : Some heat transfer occurs

When the expansion of compression of gas takes place without transfer of heat to or from the gas the process is called  a. reversible  b. adiabatic  c. polytropic  d. isothermal

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Last Answer : adiabatic

When the expansion of compression of gas takes place without transfer of heat or from the gas the process is called;  a. Isometric process  b. Isothermal process  c. Isobaric process  d. Adiabatic process

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Last Answer : Adiabatic process

The process that has no heat transfer  a. Density  b. Isentropic Process  c. Isometric Process  d. Adiabatic

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Last Answer : Adiabatic

It is impossible for any process to have as its sole result the transfer of heat from a cooler to a hotter body  a. Carnot’s statement  b. Clausius statement  c. Rankine statement  d. Gauss statement

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How does an adiabatic process compare to an isentropic process?  A. Adiabatic heat transfer is not equal to zero; isentropic heat transfer is zero  B. Both heat transfer = 0; isentropic: reversible  C. Adiabatic heat transfer = 0; isentropic: heat transfer is not equal to zero  D. Both heat transfer is not equal to zero; isentropic: irreversible

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Last Answer : Both heat transfer = 0; isentropic: reversible

If a system after undergoing a series of processes, returns to the initial state then  (a) process is thermodynamically in equilibrium  (b) process is executed in closed system cycle  (c) its entropy will change due to irreversibility  (d) sum of heat and work transfer will be zero  (e) no work will be done by the system.

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Last Answer : Answer : d

In a free expansion process  (a) work done is zero  (b) heat transfer is zero  (c) both (a) and (b) above  (d) work done is zero but heat increases  (e) work done is zero but heat decreases.

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Last Answer : Answer : c

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