Methods to Determine Voltage Regulation of Alternator

Methods to Determine Voltage Regulation of Alternator

Q1. Which method for finding percentage regulation is called pessimistic method?

a. E.M.F. method
b. M.M.F. method
c. Z.P.F. method
d. Direct loading method

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Q2. For high capacity alternators, which method is not suitable for finding percentage regulation?

a. Direct loading method
b. Synchronous impedance method
c. Ampere-turns method
d. Potier triangle method

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Q3. For finding voltage regulation of an alternator, the method which gives most accurate result is

a. E.M.F method
b. M.M.F. method
c. Z.P.F method
d. ASA modification of M.M.F. method

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Q4. Short circuit ratio of an alternator is given by

a. I_{f for rated short circuit current} / I _{f for rated short circuit voltage}
b. I_{f for rated short circuit Voltage} / I_{f for rated short circuit current}
c. I_{f for rated open circuit Voltage} / I_{f for rated short circuit current}
d. I_{f for rated short circuit current} / I_{f for rated open circuit voltage}

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Q5. Low value of SCR in an alternator indicates

a. High stability limit
b. Low stability limit
c. No stability limit
d. None of these

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Q6. If the value of SCR in an alternator is low then the air gap and voltage drop across synchronous reactance will be

a. Low, high
b. High, low
c. Low, low
d. High, high

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Q7. In Potier’s triangle method, to determine armature leakage reactance and armature reaction mmf separately, the tests performed are

a. Open circuit test and short circuit test
b. Open circuit test and zero power factor test
c. Short circuit test and zero power factor test
d. Open circuit test, short circuit test and zero power factor test

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Q8. The synchronous generator is loaded for obtaining zero power characteristics by using

a. D.C. motor
b. Lamp load
c. Synchronous motor
d. All of these

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Q9. The direct method for finding the voltage regulation of an alternator is/are

a. E.M.F method
b. M.M.F. method
c. Z.P.F method
d. None of these

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