Question: A single phase full bridge inverter can operated in load commutation mode in case load consist of______?

• 1. RL.
• 2. RLC underdamped.
• 3. RLC overdamped.
• 4. RLC critically damped

Question: An SCR is considered to be a semi controlled device because_______?

• 1. it can be turned OFF but not ON with a gate pulse.
• 2. it conducts only during one half cycle of an alternating current wave.
• 3. it can be turned ON but not OFF with a gate pulse.
• 4. it can be turned ON only during one half cycle of an AC

Question: The typical value of SCR for modern alternator is____________?

• 1. 1.5.
• 2. 0.5.
• 3. 1.0.
• 4. 1.2.

Question: An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?

• 1. 1500 A
• 2. 6000 A
• 3. 2121.32 A
• 4. 4242.64 A

Question: A Triac has three terminals viz ___________?

• 1. Drain, source, gate
• 2. Two main terminal and a gate terminal
• 3. Cathode, anode, gate
• 4. None of the above

Question: A thyristor is basically________?

• 1. PNPN device
• 2. A combination of diac and triac
• 3. A set of SCRs
• 4. A set if SCR,diac and triac

Question: A PNPN device having two gates is ___________?

• 1. Diac
• 2. Triac
• 3. SUS
• 4. BCS

Question: A silicon controlled racitifier (SCR) is a ____________?

• 1. Unijunction device
• 2. Device with three junction
• 3. Device with four junction
• 4. None of the above

Question: A thyristor equivalent of a thyratron tube is a _________?

• 1. Diac
• 2. Triac
• 3. Silicon controlled-rectifier SCR
• 4. None of above

Question: A Triac is a ______________?

• 1. 2 terminal switch
• 2. 2 terminal bilateral switch
• 3. 3 terminal bilateral switch
• 4. 3 terminal bidirectional switch