Alternating Current

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Question

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Question 1 : Power factor of an ac circuit is a measure of _______________
1. power lost in the circuit
2. virtual power
3. mean power
4. all the above
Answer
8872

Question 2 : The dimensional formula of L/R is similar to that of _____________
1. frequency
2. length
3. time
4. none of these
Answer
8873

Question 3 :

The dimensional formula of impedance is _____________

1. [ML²T^-3A^-2]
2. [ML²T^-2A^-2]
3. [ML²T^-2A^-3]
4. [ML²T^-2A^-1]
Answer
8874

Question 4 : An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the ______________
1. 960 V
2. 180 V
3. 120 V
4. 15 V
Answer
8875

Question 5 :

What is the ratio of inductive and capacitance reactances in an ac circuit?

1. ω²LC
2. ω²L
3. ωL
4. None of these
Answer
8876