On some electrical generating equipment one...

Question 1 / 205eccefa4bacbc34ba4d483e6

Question 1 of 205eccefa4bacbc34ba4d483e6

On some electrical generating equipment one outboard bearing pedestal is insulated from the bedplate. This should be checked with a millivolt meter and a jumper. With the millivolt meter connected between the shaft and the bedplate how should the jumper be used?

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🔍 Key Concepts

• Insulated bearing pedestal purpose on generators (preventing shaft/stray currents going to hull) • How a millivolt meter indicates current flow through a resistance (Ohm’s Law: more current → more voltage drop) • Effect of adding a jumper (temporary conductor) across an insulator or between shaft and support

💭 Think About

• Think about what you are trying to prove: are you checking for the presence of insulation, or trying to eliminate its effect? • If you connect the jumper in a certain way, what happens to the insulating block—does it stay in the circuit or get bypassed? • Which choice involves taking two different readings in a way that would let you compare “with insulation” versus “without insulation”?

✅ Before You Answer

• Identify which options describe using the jumper to permanently change the circuit versus temporarily bypass parts for a test only. • Ask: Do we really want to increase shaft current during a test, or just see if current exists when the bearing is insulated? • Confirm which choice uses the jumper in a way that would clearly show whether the bearing pedestal insulation is effective or broken down.

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Question 1 of 20

It should be placed from one end of the shaft to the other to eliminate shaft currents.

It is used to short the + and - in a D.C. generator or Phase A and Phase C in an alternator to eliminate the effects of CEMF.

It should be placed across the insulating block to increase the shaft current to a point where it can be measured with the millivolt meter.

It should be placed from the shaft to the pedestal while one reading is taken, then removed to take a second reading. This eliminates the insulating effect of the bearing.

Question 1 / 205eccefa4bacbc34ba4d483e6

Question 1 of 205eccefa4bacbc34ba4d483e6

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5eccefa4bacbc34ba4d483e6

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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