Question: The latching current of GTO should be of order:

• 1. 100 mA
• 2. 500 mA
• 3. 1 A
• 4. 2 A

Question: The maximum di/dt in a SCR is____________?

• 1. Directly proportional to supply voltage
• 2. Directly proportional to inductance in the circuit
• 3. Inversely proportional to supply voltage
• 4. Both A and B

Question: Example of a voltage clamping device______________?

• 1. fast acting fuse
• 2. snubber circuit
• 3. metal oxide varistor
• 4. aluminium block

Question: Switching frequency of SITH is____________?

• 1. 5 KHz
• 2. 10 KHz
• 3. 60 KHz
• 4. 100 KHz

Question: Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?

• 1. One resistor across the string
• 2. Resistors of the same value across each SCR
• 3. Resistors of different values across each SCR
• 4. One resistor in series with each SCR

Question: Thyristor can be protected from over voltages by using____________?

• 1. voltage clamping device.
• 2. fuse.
• 3. heat sink.
• 4. snubber circuit.

Question: Thyristor can be protected from over voltages by using:

• 1. 23 mA
• 2. 40 mA
• 3. 10 mA
• 4. 60 mA

Question: A single phase full bridge inverter can operate in load commutation mode in case load consists of____________?

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

Question: The function of snubber circuit connected across the SCR is to___________?

• 1. Suppress dV / dt.
• 2. Increase dV / dt.
• 3. Decrease dV / dt.
• 4. Decrease di / dt.

Question: For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?

• 1. 111.9 Ω.
• 2. 11.19 Ω.
• 3. 108 Ω.
• 4. 115 Ω