Re the five burner Whirlpool gas hob. We have the same hob. I'll assume it's the sort with the ignition switch built into each gas knob.
IE, turn on the knob, press to ignite, hold for a second or two and release. The flame is supposed to stay lit...but doesn't...
The solution. Prise up the offending knob a few mm, as if you're trying to remove the knob.
What happened? The knob has been pressed down too far and is interfering with the thermocouple action. These are the spikes next to each ring that sense if the flame is lit - it's part of the safety feature.
If this doesn't work then it's likely the thermocouple itself has failed.
Steve, January 2009