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Questions and Answers
What is the main benefit of using a three phase system for electrical power transmission?
What is the main benefit of using a three phase system for electrical power transmission?
- No difference in cost
- Smaller cross sectional area cables (correct)
- Larger cross sectional area cables
- No effect on cable size
Why is a three phase system preferable for operating AC motors?
Why is a three phase system preferable for operating AC motors?
- Voltage is always zero
- Voltage is unpredictable
- Voltage is not zero at any instant of time (correct)
- Voltage crosses zero multiple times
What is the disadvantage of using single phase voltage for operating AC motors?
What is the disadvantage of using single phase voltage for operating AC motors?
- No mechanical vibration
- More stable operation
- Higher efficiency
- Mechanical vibration due to zero voltage at multiple instants (correct)
How does using a three phase system contribute to reducing power loss?
How does using a three phase system contribute to reducing power loss?
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Why is smaller cross sectional area beneficial for power transmission?
Why is smaller cross sectional area beneficial for power transmission?
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