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Generator

CBT 26 questions

First 5 of 26 questions — with answers

The correct answer is marked. Unlock the rest to study the whole test, online or offline.

  1. Question 1

    During the parallel operation of generators, the operator adjusts the diesel generator no. 1's potmeter in the main switchboard to a higher resistance. What will happen?
    • The main bus-bar voltage will increase.
    • The reactive load on diesel generator no. 1 will increase.
    • The reactive load on diesel generator no. 1 will increase.

  2. Question 2

    How could you monitor the correct instant for synchronizing without the aid of a synchroscope or synchronizing lamps?
    • By connecting a pair of voltmeter probes across one phase of the incoming generator circuit breaker, and then adjust the generator speed until the voltmeter slowly fluctuates from zero to maximum. Connect the breaker when the voltmeter passes through zero.
    • It is not possible to synchronise generators without the synchronizing aids.
    • By off-loading the running generator to a minimum to avoid large "kicks" at connection. Adjust the incoming generator to a frequency slightly less than the running generator. The running generator will then "pull" the incoming generator into synchronism.

  3. Question 3

    How many % of nominal voltage is required before main circuit breaker can be connected to main bus bar?
    • 70 %.
    • 50 %.
    • 80 %.
    • 90 %.

  4. Question 4

    How many degrees are there between the phases in a 3-phase generator?
    • 120°.
    • 180°.
    • 90°.
    • 60°.

  5. Question 5

    If we have a generator with 4 poles, how many rpm does it need to give 60 Hz?
    • 1 800 rpm.
    • 1 200 rpm.
    • 900 rpm.

Preview — 5 of 26 questions

You are seeing the first 5 questions with answers. Unlock the remaining 21 to study the whole test — online or offline.

About this CBT test

Generator is a CBT test with 26 questions and verified answers. Common topics include: power factor, generator, load, loads, main, many, rpm, generators.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

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