There is no difference of construction between a DC generator and a DC motor. In fact, the only difference is that in a generator that generated emf is greater than the terminal voltage, whereas in a motor the generated emf is less than the terminal voltage. If E= emf generated (or induced) in armature, V = terminal voltage, Ra = resistance of armature circuit, and la = armature current. When it is running in generator mode: When it is running in motor mode: V=E - IaRa V = E + IaRa Armature resistance Brush Question 2 A motor runs at 900 rpm at 460V supply. Calculate the approximate speed when it is connected across a 200V supply. Assume the new flux to be 0.7 of the original flux. Given: VE KON where: D is the flux (Wb) and N is the running speed (rpm). Ans. 559 rpm Question 3 Prove that the torque of a series motor is proportional to the square of the armature current. Given that T o la x Question 4 The torque required to drive a DC generator at 15 rev/s is 2 kNm. The iron, friction and winding losses in the machine are 8 kW. Calculate the power generated in the armature. Ans. 180.495 kW Question 5 State the losses of a DC motor. WAP in Java to a. get input from user for one array (1-D) elements and its size too. b. find which element is even or odd and show/print it accordingly. c. add all even elements and odd elements separately and get the sums of each respectively. d. compare both sums and find which sum is greater.