AC-Voltage 8 Question Preview (ID: 51000)


Alternating Current (AC) Is An Electric Current Which Periodically Reverses Direction In Contrast To Direct Current DC Which Flows Only In One Direction . This Game Aims To Review The Characteristic Of AC- Current For Grade 8 Students. TEACHERS: click here for quick copy question ID numbers.

The amplitude of the voltage means
a) frequency
b) period
c) maximum voltage
d) effective voltage

In AC voltage the wave form is
a) straight line
b) Alternative between positive and negative directions
c) Irregular
d) None of the above choices

If the maximum amplitude(Y) is 3 div, and the vertical sensitivity(Sv) is 5v/div. Then the maximum voltage is
a) Umax =15v.
b) Umax =12v
c) Umax =5v
d) Umax =10v.

The period (T) of an alternating sinusoidal voltage of Vb =5ms/div, and X= 4div is:
a) T=1.25ms
b) T=20ms
c) T= 20 Hz
d) T=0.8 sec

If the period of AC voltage is 20ms, then the frequency is:
a) F= 20 Hz
b) F=0.05 Hz
c) F=50 Hz
d) F=50 sec

The effective value of the maximum voltage of AC voltage is
a) Ueff=Um/√2
b) Ueff=Um x√2
c) Ueff=Sv xY
d) Ueff=0V

The wave form in AC voltage is periodic because:
a) Regularly
b) Repeat itself identically
c) Has same value of period T
d) All of the above choices

In Lebanon, the effective voltage is 220V and frequency is 50Hz so the period and the maximum voltage are:
a) T =0.2sec ,Um =311.2 V.
b) T =0.02sec ,Um =311.2 V.
c) T =0.2sec ,Um =155.56 V.
d) T =0.02sec ,Um =155.56V.

If the amplitude of AC voltage increases, then:
a) The voltage increases
b) The voltage decreases
c) The voltage remains constant
d) None of the above choices

AC voltage characterized by
a) Amplitude Um
b) Period and frequency
c) Effective voltage
d) All of the above choices

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