An electric motor runs “hot” under load, owing to internal irreversibilities. It has been suggested that the associated energy loss be minimized by thermally insulating the motor casing. Comment critically on this suggestion.
What will be an ideal response?
Electrical and mechanical irreversibilities cause an increase in the internal energy, and therefore the temperature, of the motor (they convert some of the input electrical energy to heat rather than mechanical work). The temperature of the motor rises until a steady state is established such that heat transfer from the motor to the surroundings is equal to the rate at which heat is produced within the motor by these irreversibilities. Insulating the motor does nothing to decrease the irreversibilities in the motor and merely causes the temperature of the motor to rise until steady-state heat-transfer is reestablished with the surroundings. Insulating the motor will just make it run hotter and probably
damage it.
You might also like to view...
The _____________________ indicating light provides a check on the condition of the bulb.
Fill in the blank(s) with the appropriate word(s).
Photocomposition occurs when a chemical is broken down by ____________________
Fill in the blank(s) with correct word
? Identify and state the historical significance of globalization.
What will be an ideal response?
A sensor is referred to as a secondary element.
Answer the following statement true (T) or false (F)