Answer part a and b From the following options of electric m

From the following options of electric motors that can be used in an industrial plant: 120-volt single-phase 240-volt single-phase 240-volt three-phase 440-volt three-phase a. Select the motor that would have the smallest overall size for a 5. given power output. b. Which of these motors would require the smallest conductors (wire size) for the same power output?

Solution

10) torque = (HP* 5252)/ rpm

= (5*5252)/3450

=7.611J

a)three phase motors are smaller in size because Three phase electricity powers large industrial loads more efficiently than single-phase electricity. When single-phase electricity is needed, It is available between any two phases of a three-phase system, or in some systems , between one of the phases and ground. By the use of three conductors a three-phase system can provide 173% more power than the two conductors of a single-phase system. Three-phase power allows heavy duty industrial equipment to operate more smoothly and efficiently. Three-phase power can be transmitted over long distances with smaller conductor size.