The following details are known about a 250 hp, 230 V, 435 rpm dc shunt motor:  Nominal full-load current = 862 A
 Insulation class = H
 Weight = 3400 kg
As an engineer, you are required to provide the derivation, consideration and assumption that
have been taken in your calculation to determine:
i. The total losses and efficiency at full load. (5 marks)
ii. The approximate shunt field exciting current if the shunt field causes 20% of the total
losses. (3 marks)
iii. The value of the armature resistance as well as the counter-emf knowing that 50% of
the total losses at full load are due to armature resistance. (5 marks)
iv. The approximate exciting current to attain a speed of 1100 rpm.

An insulated tank truck containing 50,000 pounds of double-distilled, deionized water at 30 °c is pumped into a closed, refrigerated storage tank maintained at 5 °c in a facility located on top of mount mitchell, north carolina (elevation 6,684 feet & average july temperature of 84 °f). a)-determine the volume of the storage tank required to hold the purified water. b)- determine the initial and final pressure differences that must be overcome by a liquid pump assuming the storage tank initially contains air at 5 °c. assume the air is slowly bled out of the storage tank during the water transfer c.) during a routine operation today, the tank is slightly ruptured by a stainless steel pipe and a water acrosol of droplets begins to spray out of the storage tank. state all assumptions and determine the internal pressure within the water droplets produced