Two technicians are describing how an air-conditioning system gets rid of the heat. Technician A says that heat always flows from the hotter to the colder object. Technician B says that as a refrigerant evaporates, it absorbs heat as it changes from a liquid to a gas. Who is correct?

A. Technician B only
B. Technician A only
C. Both Technicians A and B
D. Neither Technician A nor B


Answer: B. Technician A only

Trades & Technology

You might also like to view...

The portion of masonry work that extends from the window frame to the face of the masonry wall is known as the _____ .

A. reveal B. veneer C. foundation D. frame plate

Trades & Technology

Name an example of a non-linear amplifier output

A) A square wave B) An output signal from a electric guitar C) A sinusoidal waveform D) An amplified audio signal

Trades & Technology

It is critical to _____ from the system before performing any maintenance on any component

A) purge contaminants B) increase pressure C) remove the parts D) relieve all pressure

Trades & Technology

A generator bus (slack bus) supplies a 100 MW, 50 Mvar load through a lossless transmission line with parameters on 100 MVA base below. Also, there is a 10 Mvar shunt capacitor at the load bus.

A generator bus (slack bus) supplies a 100 MW, 50 Mvar load through a lossless transmission line with parameters on 100 MVA base below. Also, there is a 10 Mvar shunt capacitor at the load bus.

1. Determine the bus admittance matrix (Ybus) for the system.
10 Mvar = 0.1 p.u.
Assuming 1 pu bus voltage
2. Calculate the voltage magnitude and angle at the load bus using the Newton-Rapson method. Use the flat-start. Provide the values after 2 iterations. General power balance equations are given below.

Trades & Technology