Ac Circuit Analysis (QUIZ #1)

The time period of a wave is

• same as frequency

• time required to complete one cycle

• expressed in hertz

• expressed in time period

The frequency of an alternating current is

• A. The speed with which the alternator runs

• B. The number of cycles generated in one minute

• C. The number of waves passing through a point in one second

• D. The number of electrons passing through a point in one second

A phasor is

• (a) a line which represents the magnitude and phase of an alternating quantity

• (b) a line representing the magnitude and direction of an alternating quantity

• (c) a coloured tag or band for distinction between different phases of a 3-phase supply

• (d) an instrument used for measuring phases of an unbalanced 3-phase load

Find the average value of current when the current that are equidistant are 4A, 5A and 6A

• 5A

• 6A

• 15A

• 10A

RMS stands for ________

• a) Root Mean Square

• b) Root Mean Sum

• c) Root Maximum sum

• d) Root Minimum Sum

What is the effective value of current?

• a) RMS current

• b) Average current

• c) Instantaneous current

• d) Total current

In a sinusoidal wave, average current is always _______ rms current

• a) Greater than

• b) Less than

• c) Equal to

• d) Not related

Peak value divided by the rms value gives us?

• a) Peak factor

• b) Crest factor

• c) Both peak and crest factor

• d) Neither peak nor crest factor

Calculate the crest factor if the peak value of current is 10A and the rms value is 2A

• a) 5

• b) 10

• c) 5A

• d) 10A

What is form factor?

• Average value / R.M.S. value.

• Average value / Peak value.

• Instantaneous value / Average value.

• R.M.S. value / Average value.