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WorksheetsELECTRO 1 Mid-term Examination (Part 2)
Total questions: 60
Worksheet time: 53mins
What is the allowable (or below) voltage value that are reasonably safe for portable hand tools?
5V
55V
110V
240V
What is the effect on the victim if he is touches a 100milli-Ampere currents?
sensation that electric shock is occurring
can paralyze or “freeze” muscles
can cause a rapid, ineffective heartbeat
may cause a person to die unless given treatment.
The inner resistance of a human body is about:
5Ω
50Ω
500Ω
5000Ω
Which is not a common cause of electrical accidents?
contact with live conductors
short circuit
overloading
none of the above
Sample of an effect of electrical hazards.
electrocution
electric shock
fire
all of the above
What instrument will you use to confirm that circuits are “dead”?
Clamp meter
Continuity tester
Multimeter
Ohmmeter
An item of electrical test equipment used to determine if an electrical path can be established between two points.
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
It is a part of a clamp meter that freezes the display reading. Reading is released when button is pushed a second time.
hold button
pointer and scale
selection switch
zero button
What is this symbols or button (below)?
COM (common terminal)
Network signal
Positive (output) terminal
Continuity test mode.
What would the continuity tester do when a complete electrical path (between two points) is detected?
will display OL (low value)
will have a zero value
will make a beep sound
will not create a buzz sound
Clamp meter are primarily used for: (click that applies)
Installation
Maintenance
Safety
Service
What instrument is this?
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
What instrument is this?
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
What instrument is this?
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
What instrument is this?
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
It is a part of a clamp meter that removes dc offset from dc current measurements. Also serves as dial’s shift button to select yellow functions scattered around the dial.
display
pointer and scale
selection switch
zero button
Also known as a VOM (volt-ohm-milliammeter) and use a micro-ammeter with a moving pointer to display readings.
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
Why would you adjust the knob in Analog Multi-meter when the input terminals are shorted (the black probe touches the red probe)?
to determine the connection
to set a zero ohms
to test the multi-meter
to create a beep sound
It is a part of a DMM that show the value of the measure voltage (ac or dc), current or resistance.
display
pointer and scale
selection switch
zero button
What is the reading in the Analog Multi-meter, when the selection switch is at x10, and the pointer is between 30 & 50?
100
300
400
500
A test tool used to measure two or more electrical values, principally voltage (volts), current (amps) but it has the advantage of having a large internal resistance (ohms).
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
If the reading in the DMM is larger than the range, the reading (in the display screen) cannot be shown.
True
False
Clamp meter are primarily used for: (click that applies)
Convenience
Installation
Safety
Service
There is a need to multiply (by the value in selection switch) for digital ohmmeter as it is the range and the conversion factor.
TRUE
FALSE
It is a part of analog multi-meter that select to measure voltage (ac or dc), current or resistance.
display
pointer and scale
selection switch
zero button
An electrical test tool that combines a basic digital multi-meter with a current sensor.
Analog multi-meter
Clamp meter
Continuity tester
Digital multi-meter
Reason why clamp meters is a popular tool (when the jaws of a clamp meter do not need to touch a conductor during a measurement)
Convenience
Maintenance
Safety
Service
Reason why clamp meters is a popular tool (clamp meters are preferred for measuring high levels of current).
Convenience
Maintenance
Safety
Service
It is a part of analog multi-meter that have scale for different measurements.
display
pointer and scale
selection switch
zero button
Express 0.000 000 04s to nanoseconds.
0.4
4
40
400
A resistor has a value of 0.1M stamped on its case. How many ohms does it have?
10 000
100 000
1 000 000
10 000 000
Diagram that shows in simplified form, the main interrelationship of the elements in a system.
block diagram
circuit diagram
system diagram
wiring diagram
What is 0.000 007second in microseconds?
0.7
7
70
700
Express 0.0025 kA in milli-Amperes.
2.5
25
250
2500
A shorthand way to draw an electric circuit, represent the pictorial components in a simplified form.
block diagram
one-line diagram
pictorial diagram
schematic diagram
Shows the component parts of a circuit by means of single lines and appropriate graphical symbols.
block diagram
one-line diagram
pictorial diagram
schematic diagram
Diagram that shows the detailed wiring & connections between the components or items of equipment.
block diagram
circuit diagram
system diagram
wiring diagram
A power plant has a capacity of delivering 500 000 watts. What is the capacity in MW?
0.5
5
50
500
Find in milli-seconds the value 0.003 seconds.
0.3
3
30
300
A diagram that shows the functioning of a circuit and is essential tool in troubleshooting.
block diagram
circuit diagram
system diagram
wiring diagram
Find in μ-Amperes the value of 0.000 045A.
4.5
45
450
4500
Diagram that shows the main features of a system and its boundaries without necessarily cause to effect.
block diagram
circuit diagram
system diagram
wiring diagram
A circuit consists of a 6V battery, a switch, and a lamp. When the switch is closed, 2A flows in the circuit. What is the resistance of the lamp?
1Ω
2Ω
3Ω
4Ω
The hindrance to the flow of charge
AC Current
DC Current
Resistance
Voltage
Suppose you replace the lamp of 6V across it but drawing only 40mA. What is the resistance of the new lamp?
100Ω
150Ω
200Ω
250Ω
A voltage of 20V is measured across a 0.2kΩ resistor. What is the current flowing through the resistor?
100mA
200mA
300mA
400mA
The current that reverses direction
AC Current
DC Current
Resistance
Voltage
If the resistance of the air gap in an automotive spark plug is 2500Ω, what voltage is needed to force 200mA through it?
100V
300V
350V
500V
The current flows in one direction.
AC Current
DC Current
Resistance
Voltage
The filament of a television tube has a resistance of 90Ω. What voltage is required to produce the tube’s rated current of 300mA?
13V
27V
35V
42V
A 110V line is protected with a 25A fuse. Will the fuse “carry” a 6Ω load?
yes
no
maybe
not sure
What is the resistance used by a soldering iron taking 2A at 110V?
50 ohms
55 ohms
60 ohms
65 ohms
Find the voltage used by a 10kΩ resistor drawing 0.01A.
100V
110V
1000V
1100V
Amount of potential energy between two points.
AC Current
DC Current
Resistance
Voltage
Find the current supplied by the generator if it delivers 20A at 220V.
10A
11A
100A
110A
An electric dryer requires 123.3Ω and draws 1.8A. Find it’s operating voltage?
100V
111V
200V
222V
The rate at which charge is flowing.
Current
Resistance
Resistivity
Voltage
Find the operating voltage of a motor that requires 30Ω and draws 8A?
110V
240V
400V
440V
What is the resistance of the compressor if the voltage is 440V across a 2200mA?
100Ω
150Ω
200Ω
250Ω
What is the current flowing through the 800mΩ resistor with a voltage of 240V?
100A
200A
300A
400A
