Discussion
Match the following for on-state resistance for the device in milliohms :
| Set I | Set II |
|---|---|
| (a) Diode | (1) 0.25 |
| (b) BJT | (2) 0.16 |
| (c) SCR | (3) 3.5 |
| (d) Triac | (4) 4.0 |
Codes : (a) (b) (c) (d)
Answer: A
The key pairs diode with 0.16, BJT with 4.0, SCR with 0.25 and triac with 3.5 milliohms, which is code (2) (4) (1) (3).
This is a recall item with no formula behind it: the on-state resistance of a power device depends on its rating, voltage class and technology, so the values are only meaningful for the particular devices in whatever table the paper's author used. I could not trace that table to a published source, so I could not confirm the four pairings independently, and nothing I found shows them to be wrong. The key is therefore kept as the University printed it.
Do not read the order of these four numbers as a general ranking of device types: other ratings of the same devices give different resistances.
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