Basic Technology JSS3

The primary voltage of a transformer is 120 volts and its primary coil has 270 turns. Calculate the output voltage, if the secondary coil has 180 turns

_____ is used to convert sound energy to electrical energy

• Radio transmitter

• Radio receiver

• Loud speaker

• Microphone

Reading of building plan means _____

• Identification and Interpreting building parts

• Rendering of the building

• Labelling the building

• Construction of building

The following are the properties of refrigerant EXCEPT ____

• Highly corrosive

• Volatile

• Non corrosive

• Low boiling point

Which of these is not a typical maintenance?

• Corrective

• Replacement

• Preventive

• Predictive

A trapezium is also known as ____

• Quadrilateral

• Triangle

• Sphere

• Polygon

The electricity at high voltage is referred to as ____

• High flow current

• Low tension supply

• Low flow current

• High tension supply

_____ is the extraction of heat from the food items to be refrigerated

• Evaporation

• Refrigeration

• Freezer

• Condensation

The substances that evaporate quickly are called _____

• Refrigerant substances

• Volatile substances

• Freon substances

• Non-volatile substances

The S.I unit of current is ____

• Ampere

• Volts

• Ohms

• Meter per seconds