There is no difference of construction between a DC generator and a DC motor. In fact,...
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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. 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.
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