NEW
Font size
WorksheetsMIDTERM - PRE TEST
Total questions: 38
Worksheet time: 29mins
Which instrument is used to measure voltage, current, and resistance?
Multimeter
Insulation tester
Clamp meter
Voltmeter
What is the minimum insulation resistance allowed between conductors in a 230V circuit?
0.5 MΩ
1 MΩ
2 MΩ
5 MΩ
Which type of insulation tester uses a crank handle to generate voltage?
Digital tester
Analog meter
Hand-cranked tester
Solid-state tester
What type of suspension is common in solid-state insulation testers?
Pivot and jewel
Taut band
Spring coil
Magnetic balance
Which component protects multimeters from high fault currents?
Glass fuse
HRC fuse
Circuit breaker
Relay
What should always be done before and after using a voltage tester?
Charge the battery
Test the tester
Replace the probes
Check the fuse
Which multimeter type is better at showing a changing value?
Analog
Digital
Clamp
Insulation tester
Which display is easier to read and usually more accurate?
Analog
Digital
Clamp meter
Test lamp
What type of value does a typical voltmeter display for AC?
Peak value
Peak-to-peak value
RMS value
Average value
What error occurs if the analog meter is not viewed directly from above?
Overload
Resolution error
Parallax error
Calibration error
What test current is typical for most multimeters when measuring resistance?
< 1 mA
10 mA
100 mA
1 A
Which meter can measure current without disconnecting the conductor?
Insulation tester
Multimeter
Clamp meter
Analog ohmmeter
What does a diode typically show on a multimeter when forward biased?
0 V
0.5–0.7 V
1.5 V
∞ ohms
What is the main advantage of a Hall effect clamp meter?
Measures AC only
Measures AC and DC
Does not need calibration
Cheaper than CT type
What is the function of the bar graph in a digital multimeter?
Shows stored data
Shows overloads
Indicates changing values
Adjusts calibration
Which voltage category rating applies to domestic equipment?
Cat I
Cat II
Cat III
Cat IV
Which instrument is unsuitable for measuring resistance in live circuits?
Analog multimeter
Digital multimeter
Ohmmeter
All of the above
What type of meter is ideal for noisy electrical environments?
Digital multimeter
Analog multimeter
Clamp meter
Proximity tester
What should be done after measuring current with a multimeter?
Switch off the circuit
Replace probes in voltage terminals
Calibrate the meter
Change fuse
What causes an overload indication on a digital multimeter?
Battery low
Leads disconnected
Value exceeds selected range
Wrong fuse
What is the main safety concern with glass fuses in meters?
Inaccurate readings
Can explode under high fault current
Too expensive
Not reusable
Which measurement requires breaking the circuit to insert the meter in series?
Voltage
Resistance
Current
Capacitance
What happens if both active and neutral conductors are clamped together in a clamp meter?
Double reading
Zero reading
Overload
Half reading
Which device is used to detect the presence of voltage without contact?
Proximity tester
Multimeter
Test lamp
Ohmmeter
What is the disadvantage of neon test pencils?
Too expensive
Require batteries
Unsafe and unreliable
Do not detect DC
What is the leakage current threshold that trips an RCD?
10 mA
20 mA
30 mA
50 mA
Which clamp meter component is used for AC only measurement?
Hall effect device
Current transformer
Rectifier
Battery
What does a digital multimeter display when probes are not connected in resistance mode?
0 Ω
∞ or overload
0.5 Ω
Short circuit
Which factor defines how many decimal places a meter can read?
Accuracy
Resolution
Sensitivity
Stability
Which factor defines how much power a meter takes from the circuit?
Accuracy
Resolution
Sensitivity
Calibration
What is the main risk after an insulation resistance test?
Battery discharge
Circuit overheating
Charged circuit causing shock
Wrong reading
Which test voltage is typically used for 400 V installations?
100 V
250 V
500 V
1000 V
What should you do when reading an analog meter scale?
Look from any angle
Use mirror to avoid parallax error
Estimate reading
Ignore minor marks
What is the advantage of a taut band suspension?
Cheaper
More rugged than pivot assemblies
Smaller size
Better accuracy
Which component inside a Hall effect clamp meter senses the magnetic field?
Coil
Rectifier
Semiconductor wafer
Diode
What type of voltage tester measures voltage directly?
Proximity tester
Contact tester
Neon lamp
Test pencil
Why should probes have the same or higher Cat rating as the meter?
For better resolution
For matching calibration
For safety under fault conditions
For accuracy
What should you never do with an ohmmeter?
Use in noisy area
Measure high resistance
Connect to a live circuit
Check diodes
