Results
Q1. The impedance of a circuit:
Correct answer is – is the total resistance in an AC circuit
Q2. The ratio of true power to apparent power is known as:
Correct answer is – the power factor
Q3. In a constant frequency AC supply system, the frequency is determined by:
Correct answer is – the generator drive speed and the number of poles
Q4. The amount of electrical power output for a given generator weight is:
Correct answer is – greater for an AC generator
Q5. The frequency of a supply is quoted in:
Correct answer is – cycles or hertz
Q6. One advantage that AC has over DC is:
Correct answer is – the ease with which the voltage can be stepped up or down with almost 100% efficiency
Q7. The voltage output of an AC generator will rise to a maximum value:
Correct answer is – in one direction, fall to zero and rise to a maximum value in the opposite direction
Q8. If the frequency in an inductive circuit is less than it was designed for, then current consumption will:
Correct answer is – increase
Q9. In a capacitive circuit, if the frequency increases:
Correct answer is – current increases
Q10. The line voltage of a typical aircraft constant frequency paralleled AC system is:
Correct answer is – 200
Q11. A 400 Hz supply has:
Correct answer is – a frequency of 400 cycles per second
Q12. In an AC circuit which is mainly inductive:
Correct answer is – current will lag voltage
Q13. If the frequency is increased in an inductive circuit:
Correct answer is – reactance will increase
Q14. The RMS value of alternating current is:
Correct answer is – .707 times the peak value
Q15. The number of separate stator windings in an AC generator determines:
Correct answer is – the number of phases present in the supply
Q16. kVAR is a measure of:
Correct answer is – the reactive load on the alternator
Q17. The output of an alternator is rated in:
Correct answer is – kVA
Q18. Instruments measuring AC are calibrated in:
Correct answer is – RMS values
Q19. Impedance is the:
Correct answer is – vector sum of the resistance and the reactance
Q20. If an alternator is run at below normal frequency, then:
Correct answer is – inductive devices will overheat
Q21. The power factor is:
Correct answer is – kW / kVA
Q22. When reactance is present in a circuit:
Correct answer is – the power factor will be less than one
Q23. Generator output frequency is decreased by decreasing the:
Correct answer is – generator field rotation speed
Q24. The RMS value of AC is:
Correct answer is – the value of DC which would provide the same heating effect
Q25. In a reactive circuit:
Correct answer is – the voltage and current will be out of phase
Q26. A capacitor consists of two metal plates:
Correct answer is – separated by waxed paper or mica
Q27. In a DC circuit, an inductance:
Correct answer is – offers opposition to the flow while switching on and off
Q28. The basic unit of inductance is:
Correct answer is – the henry
Q29. In an inductive circuit:
Correct answer is – current lags the voltage
Q30. In a capacitive circuit, if the frequency increases then:
Correct answer is – current flow increases
Q31. The power factor is:
Correct answer is – REAL POWER / APPARENT POWER
Q32. Transferring electrical energy by means of a magnetic field is called:
Correct answer is – electromagnetic induction
