PIPE Thermodynamics Pt.12

Which of the following state(s) is/are necessary for a system to be in thermodynamic equilibrium?

• chemical equilibrium

• thermal equilibrium

• mechanical equilibrium

• chemical, mechanical, and thermal equilibrium

Adiabatic heat/transfer within a vapor cycle refers to:

• heat transfer that is atmospheric but not reversible

• the transfer of energy from one stream to another in a heat exchanger so that the energy of the input streams equals the energy of the output streams

• heat transfer that is reversible but not isentropic

• there is no such thing as adiabatic heat transfer

Bases on the first law of thermodynamics, which of the following is wrong?

• the heat transfer equals the work plus energy change

• the heat transfer cannot exceed the work done

• the net transfer equals the net work of the cycle

• the net heat transfer equals the energy change if no work is done

Assuming real processes, the net entropy change in the universe ___.

• must be calculated

• equals to zero

• is negative

• is positive

What is referred by control volume?

• an isolated system

• closed system

• fixed region in space

• reversible process only

How do you treat a statement that is considered a scientific law?

• we postulate to be true

• accept as a summary of experimental observation

• we generally observed to be true

• believe to be derived from mathematical theorem

Which of the following is used in thermal power plant?

• brayton

• rankine

• reversed carnot

• ottot

A Bell - Coleman cycle is reversed ___.

• stirling cycle

• carnot cycle

• joule cycle

• otto cycle

The elongation and compression of a helical spring is an example of ___.

• irreversible process

• isothermal process

• reversible process

• adiabatic process

Otto cycle consists of ___.

• two isentropic and two constant volume process

• two isentropic and two constant pressure processes

• two adiabatic and two isothermal processes

• two isothermal and two constant volume processes