12 Questions
What is the primary purpose of adjusting the speed of the shunt-dc motor to the rated value of the alternator?
To achieve the rated terminal voltage of the alternator
What is the purpose of connecting the alternator stator terminals to the variable Y-connect resistive load?
To vary the load current in steps
What is the primary objective of performing a load test on an alternator?
To determine the regulation and efficiency of the alternator
What is the effect of increasing the excitation current on the generated voltage in the armature?
The generated voltage will increase
What is the significance of keeping the speed of the shunt-dc motor constant at 1500 rpm?
To ensure a constant power output
What is the purpose of calculating the voltage regulation of the alternator at each load current value?
To determine the percentage change in terminal voltage
What is the purpose of Fig. 1 in the text?
To illustrate the open-circuit characteristic of an alternator
What is the formula used to determine the efficiency of an alternator?
η = (Pout - Ploss) / Pin * 100%
What is the significance of plotting the variation of efficiency against the armature current?
To analyze the performance of the alternator under different loads
What is the term for the power lost in the driving motor?
Ploss
What is the rating of the variable rheostat used in the experiment?
1-ph, 6 kW
What is the assumption made about the mechanical loss in the experiment?
It is constant at no and full load
This quiz covers the load test experiment on an alternator, including load characteristics, theory, and determining regulation and efficiency. The experiment involves adjusting the excitation current to vary the AC voltage generated at the alternator terminals. Understand the concepts and procedures involved in this electrical engineering experiment.
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