[PIPE] Question Bank for Advanced Coaching Series | Set 1 – Elements | Part 1

When air is saturated, the wet bulb depression is

In a window air conditioning unit which of the following is usually done by the owner?

Fan motors in air conditioning units usually have

Which of the following capacitors that can usually be found in an air conditioning unit?

Which of the following troubles commonly occurs inside an air conditioning unit?

The motor condition of an air conditioning unit can be checked with

An air conditioning system wherein the entire systems are mounted in the cabinet

The use of water to carry heat occupied spaces

The method of cooling which primarily used where ambient air temperatures are high and relative humidity is used

The other name for Swamp Cooling is

Evaporative condenser is used to cool

A method of cooling which uses water as refrigerant. Pressure on the water surface is reduced to lower its boiling temperature.

Palladium Chloride may be used to measure the presence of

The amount of CO can be determined by the color of Palladium Chloride. An amount of 30 ppm to 70 ppm will cause

The term used to express the amount moisture in a given sample of air. It is compared with the amount of moisture in a given sample of air

How should the window type air conditioning unit be placed?

A dehumidifier is usually a small hermitic refrigerating system. It has both a condenser and an evaporator. Many older systems use R-12 or R-500. The newer units use:

The normal cut-out setting of a window unit thermostat is between:

Thermostat are used with most window units. They have differentials which vary between

In an air conditioning unit, the thermostat fails. The unit did not start. How do you test the operation of the thermostat?

Which of the following dehumidifier is often used to reheat the air after moisture is removed?

Which of the following refrigerant is added sometimes to other refrigerant to improve oil circulation?

A refrigeration that deals with producing temperature of -157 °C or lower.

Measurement of a device’s ability to remove atmospheric air from test air.

A liquid mixture having constant maximum and minimum boiling points. Refrigerants comprising this mixture do not combine chemically, yet the mixture provides constant characteristics.

Refrigerant in Group Al (R-ll). Chemical combination of carbon, chlorine, and fluorine.

Which of the following refrigerants is popular in the industrial refrigerating system; also popularly absorption system of refrigerant

Which of the following is a function of air conditioning?

Oxygen is approximately what percent by weight in the atmosphere?

Substances that have the ability to absorb moisture from the air are called:

When the dry bulb and the wet bulb temperatures are identical, the air is said to be

In what form that water exists in air?

When air is heated, what happened to its relative humidity?

The Horizontal Scale (Abscissa) in the Psychrometric Chart represents

Most people are comfortable with the relative humidity of

The temperature below which water vapor in the air will start to condense.

Which of the following is not used as method to measure air velocities?

It is a form of oxygen photochemically produced in nature.

What is the Chemical formula of Ozone?

In the upper atmosphere, ozone is made by ultraviolet light reacting with

The ozone concentration of 0.10 parts per million (ppm) is generally considered the maximum permissible for how many hours exposure?

How may moisture be removed from air?

In cooling cycle, the dry bulb temperature (db) of the air is lowered. When this happens the relative humidity

What is the effect of superheating the refrigerant?

In sensible heating the absolute humidity remains constant but the relative humidity

The relative humidity becomes 100 % and where the water vapor starts to condense.

Why should you avoid bending or twisting of fan blades in an air conditioning unit?

A type of refrigerant that will not damage the ozone layer.

Which of the following is the type of refrigerant that damages Ozone layer?

Large-bulb alcohol thermometer used to measure air speed or atmospheric conditions by means of cooling.