Questions

Multiple-choice questions you can practise one by one. Open a question, tap an answer and see at once whether it is right. For a random set, try Quick practice.

941 questions

• What is the basic operating idea of a dual converter?

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• What is one reason for using PWM in an inverter?

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• Which statement best describes a current-source inverter?

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• Which statement best describes a voltage-source inverter?

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• What is a common purpose of a parallel inverter configuration?

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• What is the duty cycle of a chopper?

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• For an ideal buck chopper, increasing duty cycle while input voltage is fixed generally:

  Industrial Electronics & Control of Drives › Unit 3: Inverters, Choppers, Dual Converters and Cyclo-Convertors · Medium

• What is the role of a freewheeling diode in a controlled rectifier feeding an RL load?

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• What is the purpose of forced commutation in an SCR circuit?

  Industrial Electronics & Control of Drives › Unit 1: Introduction to Thyristors · Medium

• In a UJT relaxation oscillator, what causes the capacitor to discharge rapidly?

  Industrial Electronics & Control of Drives › Unit 1: Introduction to Thyristors · Medium

• Why is a TRIAC useful for lamp dimming?

  Industrial Electronics & Control of Drives › Unit 5: Power Converter Applications · Medium

• What is the purpose of gate-pulse synchronization with the AC supply?

  Industrial Electronics & Control of Drives › Unit 1: Introduction to Thyristors · Medium

• In a three-phase fully controlled bridge, how many SCRs are typically used?

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• What is a key reason for using a three-phase controlled rectifier in higher-power applications?

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• A centre-tapped single-phase full-wave controlled rectifier normally requires:

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• What is the main benefit of a fully controlled bridge rectifier compared with a half-controlled bridge?

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• Why can an inductive load continue conducting after the supply voltage crosses zero?

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• For a single-phase half-wave controlled rectifier with a resistive load, conduction begins when:

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• In phase control, what generally happens to the average output of a single-phase controlled rectifier when firing angle increases?

  Industrial Electronics & Control of Drives › Unit 2: Controlled Rectifiers · Medium

• Why is a snubber network connected across a thyristor in many circuits?

  Industrial Electronics & Control of Drives › Unit 1: Introduction to Thyristors · Medium