A 25 kW, 240 V self excited dc shunt generator has a field circuit resistance of 62.5 Ω, and an armature resistance of 0.05 Ω. When delivering rated current at rated speed and voltage, calculate % Efficiency when rotational losses are 1200W, and iron losses are 600W. Note that Copper losses must be calculated too. No Units!

A series R L C circuit has the following parameters: R = 10 Ω, L = 10 mH and C = 100 nF. Find the linear resonant frequency f0 and the angular resonant frequency ω0.

G1. The terminals of a DC motor are identified as the same as those of a DC generator. a) true b) false G2. What are the standard identification letters for the armature winding of a DC compound motor? a) A1 and A2 b) S1 and S2 C) F1 and F2 d) none of the above G3. What are the standard identification letters for the series field winding of a DC compound motor: a) A1 and A2 b) 1I and S2 c) F1 and F2 d) none of the above