Ruud furnace won't stay lit.

Question

Our Ruud furnace has an electric ignition. When it get so hot the flames come on. But the flames only burn for about a minute then it cuts off. It is not reaching the temperature we have set on our thermostat. Do these kind of furnaces with this tye of starter have thermocouple. It reminds me of a furnace with a pilot lite. The fan goes ahead and blows for a while.