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 can cause unwanted SCR turn-on due to a rapid rise in off-state voltage?

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

• What is the difference between latching current and holding current?

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

• Why is an SCR called a latching device?

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

• Which type of converter is used for direct AC-to-AC frequency conversion without an intermediate DC link?

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

• Which quantity is commonly controlled by changing the duty cycle of a DC chopper?

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

• In a series inverter, the load circuit commonly uses:

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

• Which device is commonly used as a relaxation oscillator in thyristor triggering circuits?

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

• What is commutation of an SCR?

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

• Which thyristor parameter is the rate of rise of off-state voltage?

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

• Which thyristor parameter is the rate of rise of anode current?

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

• Which converter is often used for variable-speed control of a DC motor?

  Industrial Electronics & Control of Drives › Unit 4: Thyristor Control of Electric Drives · Easy

• A cycloconverter converts AC power at one frequency directly to:

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

• A dual converter generally uses:

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

• What is the primary function of a chopper?

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

• What is the primary function of an inverter?

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

• Which instrument is commonly used to observe rectifier output waveforms in a lab?

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

• A single-phase bridge rectifier has how many bridge arms?

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

• A single-phase half-wave controlled rectifier typically uses how many SCRs?

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

• What is the purpose of a freewheeling diode with an inductive load?

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

• Which load is represented by R in a rectifier circuit?

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