The coefficient of performance for a heat pump can be Less t

The coefficient of performance for a heat pump can be: Less than one. Greater than one but less than 2. Greater than one. Negative. A T-S diagram can be used to determine: The heat transfer for a system. The work for a system, but not heat transfer. Work for a control mass. Heat for a control volume. To fix a state in the superheat region: Enthalpy and temperature can be used. Entropy and pressure can be used. Temperature and pressure can be used. All the above are true. Which of the following is drawn around a device undergoing an analysis? Atmosphere Control boundary. Assumptions Heat transfer. The temperature at which vaporization takes place is: High temperature Constant temperature Saturation temperature None of the above. The pressure measuring device that is based on height difference of a liquid is called a: Manometer Transducer Pressure gage All of the above. A system undergoes several processes and returns to the initial state is called a: Reversible process. Carnot cycle. Heat engine Cycle

Solution

13 c

14. A

15:b

16:b

17: c

18.a

19: a