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WorksheetsAc Circuit Analysis (QUIZ #1)
Total questions: 30
Worksheet time: 23mins
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.
Select the wave that has the least value of form factor.
Square wave.
Rectangular wave.
Triangular wave.
Sine wave.
What is the frequency of domestic power in Pakistan?
50 Hz.
60 Hz.
220 Hz.
70 Hz.
What is the real power in AC operation?
VIcosφ.
Apperant power × cosφ.
Both option A and B.
None of these.
What is called the instantaneous value of an alternating current?
The value of alternating quantity at any instant.
The value of peak quantity at any instant.
The value of peak current at any instant.
The value of alternating frequency at any instant.
What is called a cycle in case of AC operation ?
When ac completes the (+)ve half, is called a cycle.
When ac goes through a complete (+)ve to (-)ve, is called a cycle.
When an alternating quantity completes the (–)ve cycle, is called a cycle.
Option A and C both.
The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?
180
90
60
0
For a sine wave with peak value Emax the average value
A. 0.636 Emax
B. 0.707 Emax
C. 0.434 Emax
D. 1.414 Emax
For a sine wave with peak value Imax the r.m.s. value
A. 0.5 Imax
B. 0.707 Imax
C. 0.9 Imax
D. 1.414 Imax
1. In a rectangular wave, peak factor is
1.6
0.7
1
1.1
The peak factor of alternating electric current is the ratio of
(a) average value to he RMS value.
(b) maximum value to the average value.
(c) RMS value to the average value.
(d) maximum value to The RMS value.
An rms voltage of 5 V is equivalent to (a) .
write down the constant rms value of current
(a)
if the peak of a sine wave is 13 V, the peak-to-peak value is
(a)
is this formula for Average Value of Current = IAV = 0.637 IM?
write down the equation of generated emf
(a)
write down the value of form factor
(a)
write down the formula for crest factor ?
(a)
the form factor of sine wave is
(a)
the value of crest factor of saw tooth wave is ?
(a)
the value of RMS value of triangular wave is?
(a)
