4 - GIZ

Which or the following devices most likely uses a direct current?

• Washing machine
• Desktop computer
• Toaster
• Flashlight

Illumination is measured in which of the following units:

• Lumens
• Foot candles
• Light per square inch
• None of the above

If the current is 12 amperes and the voltage is 15 volts, what is the

• 0.75 ohms
• 0.80 ohms
• 0.90 ohms
• 1.25 ohms

A variable resistor:

• Has a fixed resistance.
• Changes with the amount of voltage applied.
• Has a movable arm that swipes across a coil that has less resistance at one end and more at the other.
• All of the above

All exposed metal in the electrical circuit should be:

• Earthed
• Connected
• Kept away
• Painted

The difference between a FUSE and a Circuit Breaker (CB):

• Fuse can use many times but CB only once
• Fuse only once and, but CB many times
• Fuse and CB can use any number of times
• All of the above

What is the moving part of three-phase motors called?

• Shaft
• Rotor
• Bearing
• Air gap

the momentum of a body

• is always different from zero
• is directly proportional to the speed
• depends on the force inside the body
• it is always constant

il teorema di Bernoulli esprime la conservazione di energia per i fluidi

• in steady state
• perfect, incompressible and in steady state
• perfect
• none of the above

1 kcal is equal to

• 4187 j
• 9,81 j
• 4,187 j
• none of the above