Power Electronics Quiz

An SCR has …………….. PN junctions

• 2

• 3

• 4

• 1

An SCR has ………….. semiconductor layers

• 2

• 3

• 4

• 1

In a 3-∅ controlled bridge rectifier, the frequency of ripple in the output voltage depends on

• Power factor

• Supply frequency

• Voltage source

• Firing angle

What is the purpose of a snubber circuit in an SCR application?

• To protect the SCR from overvoltage

• To increase the firing angle

• To reduce the power factor

• To decrease the supply frequency

How does a rectifier differ from an inverter in terms of output?

• A rectifier converts AC to DC, while an inverter converts DC to AC

• A rectifier converts DC to AC, while an inverter converts AC to DC

• Both rectifier and inverter convert AC to DC

• Both rectifier and inverter convert DC to AC

What is the function of a diode in a rectifier circuit?

• To control the firing angle

• To convert AC to DC

• To reduce the power factor

• To increase the supply frequency

How does a thyristor differ from a diode?

• A thyristor has three semiconductor layers, while a diode has two

• A thyristor converts AC to DC, while a diode converts DC to AC

• A thyristor can be turned off, while a diode cannot

• A thyristor has a higher power rating than a diode

What is the significance of the firing angle in a controlled rectifier circuit?

• It determines the frequency of the output voltage

• It controls the power factor of the circuit

• It regulates the amount of power delivered to the load

• It influences the efficiency of the rectifier

What is the function of a capacitor in a rectifier circuit?

• To control the firing angle

• To store and release electrical energy

• To reduce the power factor

• To increase the supply frequency

What is the primary purpose of a rectifier circuit in electronics?

• To convert DC to AC

• To amplify electrical signals

• To convert AC to DC

• To regulate voltage levels