Question

QUICK QUIZ: 1. As excitation current was decreased from 1.0 amps to pull-out, the stator current: (a) Went up then down. (b) Went down then up. (c) Remained the same. 2. At the lowest point on the stator current curve: (a) Current is leading voltage. (b) Current is lagging voltage. (c) Current is in-phase with voltage. 3. Normal excitation is when the synchronous motor has: (a) Unity power factor. (b) Leading power factor. (e) Lagging power factor. Op

Answer 1

the stato corrent 2. At the lowest point on .. cure. Unity of lowest point) lead (c.) at unity Pf the wrrent is in phase with the voltage. 3. Under normal etwtation the synchronos motor neither absorb nor deliver any reactive power so it opeiates at Unity powa füctos, I 4. At under excitation the synchronus m tend to absorb reactive power and operates at cag power factor. 5. Al oveg excitation the synchronus motor deliver reactive power and operates at leading power factor Scanned with CamScanner

No may Uncler 4. AR slo Ialost ---- - ~ lags la Scanned with CamScanner