You are attempting to parallel two AC...

🔍 Key Concepts

• Synchroscope indications: What does a "fast" direction of rotation tell you about the incoming generator’s frequency compared to the bus? • Governor (speed) control vs. voltage/field control: Which control affects frequency/speed, and which affects voltage/reactive power? • Proper closing conditions: What must be true (frequency, phase angle, and voltage) at the instant you close the breaker?

💭 Think About

• If the pointer is slowly rotating in the fast direction, is the incoming machine slightly faster or slower than the bus? What adjustment would correct that? • Which device should you use to change the speed (frequency) of the incoming generator: the governor switch or the field rheostat? • When synchronizing, at what approximate phase angle (pointer position) should the breaker be closed to avoid large inrush currents and torque shocks?

✅ Before You Answer

• Verify which control (governor vs. field rheostat) is used for speed/frequency and which is used for voltage. • Check whether the action described in each choice actually addresses the condition shown by the synchroscope (fast rotation) or something else (like only voltage). • Confirm that the correct procedure involves both getting the pointer nearly stopped and closing at/near the 0° position, but notice what the question asks you to do next given that the pointer is still moving fast.

You are attempting to parallel two AC generators and the synchroscope pointer is revolving slowly in the fast direction. What should be done next?

use the governor control switch to adjust the incoming voltage so it is equal to the bus voltage

use the governor control switch to increase the speed of the machine on the line only

close the circuit breaker when the synchroscope pointer approaches the 0° position

use the field rheostat to adjust the speed of the incoming machine

🔍 Key Concepts

💭 Think About

✅ Before You Answer