A voltmeter should be set at _____ scale when working with an unknown voltage:

Which of the following meter has its own built in power supply:

In a three phase motor, ____ degrees will be the phase shift of the winding with each other winding:

Magnetic lines of force is known as:

One amp is defined as which of the following:

Pressure drop in refrigeration system is generally expressed in ______ units:

Inorder to eliminate flashing in the liquid line, the high pressure liquid has to be _________ as it enters the liquid line:

When the liquid in the refrigeration system is sub-cooled, there will be change in pressure:

The ______ heat is mainly from the dry air:

Wet bulb depression _______ as the moisture content in the air increases:

The ______ heat removal is possible only when the air is cooled below its dew point temperature:

Higher aspect ratios for the duct can create turbulence:

High Efficiency Particulate Air (HEPA) filters can able to filter the dust particles of the order:

For cooling, the Seasonal Energy Efficiency Ratio (SEER) of an air source heat pump ranges from ______:

Centrifugal fans discharge air perpendicular to the axis of the impeller rotation:

1 lb of water evaporated from cooling tower approximately takes with it  _____ of heat