Can you use a heat pump to provide the temperature difference to run a heat engine?

No,we cannot use  heat pump to provide the temperature difference to run a heat engine.

Explanation:

In a heat pump energy is transferred from the heat source to the heat sink whereas in the heat engine energy is transferred from a higher temperature level to a lower  temperature level called sink.In a heat engine the heat energy is converted into mechanical energy

El ultrasonido son ondas sonoras con frecuencias superiores al límite audible superior del oído humano. El ultrasonido no es diferente del sonido "normal" (audible) en su aspecto físico.