Level 3 Science and Principles

Calculate ( 42 x 4 ) + ( 6 ÷ 3 ) -2 = ?

• 168

• 106

• 334

• 56

Calculate 10000 x 100 =

• 1,000.000

• 10,000

• 1000

• 100,000

To stop heat damage to a relay you would use which component?

• Transistor

• Diode

• Resistor

• Capacitor

What does an inverter do?

• Changes d.c to a.c

• Changes a.c to d.c

• Changes a sinusoidal waveform to direct current

• Changes light to electricity

What device converts light energy into electrical energy, and is used in burglar alarms?

• Zener diode

• Light emitting diode

• Light dependent resistor

• Photo cell

PNP and NPN are types of?

• Transistor

• Diode

• Diac

• Thyristor

Poor power factor in a circuit would cause?

• Less current consumption from the supply

• More current consumption from the supply

• The supply voltage to increase

• The supply voltage to decrease

What is used to improve power factor?

• Inductor

• Capacitor

• Resistor

• Transformer

What is the disadvantage of using synchronous motors to correct power factor?

• System uses more voltage

• The cost of capacitors

• System uses more current

• The cost of synchronous motors

An Inductor effects the current in a circuit, and causes it to?

• Lag the voltage

• Lead the voltage

• Double the voltage

• Be in phase with the voltage