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AC Voltage
Test Description: Ac Voltage is the main source of electricity uses in our homes instlations
Instructions: Answer all questions to get your test result.
1) The wave form of DC voltage on oscilloscope is
A
straight line
B
Sinusoidal wave
C
Triangular wave
D
Rectangular wave
2) The voltmeter measures :
A
Maximum current
B
Effective voltage
C
Effective current
D
Maximum voltage
3) The voltage supplied by the mains of EDL characterized by :
A
All the above choices
B
Effective voltage 220 Volt
C
Frequency %0 Hz
D
Alternating sinusoidal
4) The unit of current in SI unit is :
A
Joule
B
Volt
C
Ampere
D
Watt
5) Period ( T ) can be determined by Law T = Vb x where x is
A
The number of units between two crests
B
The number of units in the amplitude ( y – units )
C
All the above choices
D
The number of units in one crest
6) Effective voltage is determined by the following law :
A
Ueff = I/T
B
U eff = Umax/√2
C
U eff = Sv x Y
D
None of the choices
7) The horizontal sensitivity ( Time base ) is used to determine
A
Maximum voltage
B
Effective voltae
C
All the above choices
D
Frequency
8) The voltage that cause electrocution leading to death is :
A
All the above choices
B
25 V in wet places and 50 V in dry places
C
25 V in dry places
D
Current less than 100 mA
9) The screw driver glows when tests :
A
All the above choices
B
Ground line
C
Live line
D
Neutral line
10) The Oscilliscope uses to find the :
A
Type of voltage
B
Maximum voltage
C
Period
D
All the above choices
*select an answer for all questions
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