Answer:
(d) Spheroidizing
Explanation:
Spheroidizing
This is the heat treatment process for steel which having carbon percentage more than 0.8 %.As we know that a hard and brittle material is having carbon percentage more than 0.8 %.That is why this process is suitable for the hard materials.
In this process a hard and brittle materials convert into soft and ductile after this it improve the machine ability as well as improve the tool life.
In this process grain become spheroidal and these grains are ductile.
Thermostat
Usually 160 or so degF
Water pump creates pressure differential/flow
Thermostat is closed only allowing minimum flow through a bypass hose. Water temp reaching set-point opens the thermostat for flow through the engine block and to radiator heat rejection.
Temperature sensor and electric 12vdc fan motor cycle fan on newer cars to control temperature but not flow.
A. Email your teacher right away. It would be the safest option.
