Question

A three-phase Wye-connected synchronous generator is rated 3600 rpm, 200kVA, 480V, 60 Hz. The generator’s armature winding resistance is R_A = 0.03Ω and the synchronous reactance X_S is 0.25Ω. The rotational losses are 6kW, the core losses are 4kW, and the stray losses are 1% of the output real power. The generator is delivering 200kVA power at 0.85 pf lagging at rated voltage. Taking the phase voltage at the output as a reference, answer the following questions.

How many poles does this generator have?

2

4

6

10

8

20

The input power to the generator in kW.

Group of answer choices

170.00

181.70

176.43

186.88

195.21

189.16

Question 15

The input torque applied to the generator’s shaft (Nm).

386.9

495.7

443.6

522.5

374.6

299.9

Question 16

The percentage efficiency of the generator (neglect losses in the field winding) is

86.7

96.3

90.9

80.1

94.8

88.2

Answer 1