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Questions and Answers
What is the primary purpose of adjusting the speed of the shunt-dc motor to the rated value of the alternator?
What is the primary purpose of adjusting the speed of the shunt-dc motor to the rated value of the alternator?
- To ensure maximum efficiency of the alternator
- To achieve the rated terminal voltage of the alternator (correct)
- To maintain a constant load current
- To regulate the field current of the alternator
What is the purpose of connecting the alternator stator terminals to the variable Y-connect resistive load?
What is the purpose of connecting the alternator stator terminals to the variable Y-connect resistive load?
- To maintain a constant power factor
- To test the efficiency of the alternator
- To vary the load current in steps (correct)
- To measure the voltage regulation of the alternator
What is the primary objective of performing a load test on an alternator?
What is the primary objective of performing a load test on an alternator?
- To establish a residual flux in the field winding
- To adjust the A.C. voltage generated at the alternator terminals
- To determine the regulation and efficiency of the alternator (correct)
- To determine the open-circuit characteristic of the alternator
What is the effect of increasing the excitation current on the generated voltage in the armature?
What is the effect of increasing the excitation current on the generated voltage in the armature?
What is the significance of keeping the speed of the shunt-dc motor constant at 1500 rpm?
What is the significance of keeping the speed of the shunt-dc motor constant at 1500 rpm?
What is the purpose of calculating the voltage regulation of the alternator at each load current value?
What is the purpose of calculating the voltage regulation of the alternator at each load current value?
What is the purpose of Fig. 1 in the text?
What is the purpose of Fig. 1 in the text?
What is the formula used to determine the efficiency of an alternator?
What is the formula used to determine the efficiency of an alternator?
What is the significance of plotting the variation of efficiency against the armature current?
What is the significance of plotting the variation of efficiency against the armature current?
What is the term for the power lost in the driving motor?
What is the term for the power lost in the driving motor?
What is the rating of the variable rheostat used in the experiment?
What is the rating of the variable rheostat used in the experiment?
What is the assumption made about the mechanical loss in the experiment?
What is the assumption made about the mechanical loss in the experiment?
