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WorksheetsCBT 4- Part 1
Total questions: 40
Worksheet time: 20mins
What is static electricity?
A lightning discharge.
A flow of electric charge.
A stationary electric charge.
A vibration of atoms to discharge
What is the current flow in a circuit when a 6 V d.c supply is connected to a resistive load of 2 Ω?
2 A
3 A
6 A
12 A
Which formula is used to determine the work done?
Force x Distance
Force ÷ Distance
Distance - Force
Distance + Force
What is a physiological effect of a severe electric shock on the human body?
Sweating
Itching
Heart failure
Bleeding
What will happen when a mechanical force is applied to a piezoelectric crystal?
Light is emitted
Power is produced
A gas is given off
An EMF is generated
How do fuel cells produce electricity?
By light emission.
By electron movement
By mechanical forces
By chemical reaction
Which type of resistor is used to adjust the voltage output of an electronic d.c power supply?
A potentiometer
A fixed carbon
A thick film
A preset
What is the total voltage across three 2 V cells connected in parallel with the same polarity?
1 V
2 V
3 V
6 V
What is the effect of reducing the length of a conductor on its resistance?
Resistance increases
Resistance halves
Resistance doubles
Resistance decreases
Which type of meter is used to directly measure electrical power?
Ammeter
Voltmeter
Wattmeter
Ohmmeter
What is the effect of reducing the effective area of capacitor plates?
Decreases the capacitance
Increases the capacitance
Decreases the working voltage
Increases the working voltage
What is the resistance of a d.c circuit when a voltmeter reading is 24 V and an ammeter reading is 4 A?
4 Ω
6 Ω
12 Ω
24 Ω
Which Personal Protective Equipment (PPE) is used in noisy environments?
Safety goggles
Ear defenders
Safety boots
Hand gloves
What is the correct procedure before an object is manually handled?
Assess the whole task
Weigh the whole load
Measure the load
Assess stability
Which chemical is classed as corrosive?
Sodium fluoride
Calcium carbonate
Sodium chloride
Calcium oxide
Which action must be taken before ascending a ladder?
Measure its length
Secure its position
Check its suitability
Determine its weight
Which workplace situation is classified as a confined space?
Workshop
Laboratory
Sub-station
Service tunnel
Which radiation will cause harm to the human body when arc welding?
Ultraviolet
Infra-red
Thermal
Ionic
Which precaution minimizes the risk of electric shock?
Switching off the supply
Using a clear warning sign
Providing earthing systems
Wearing rubber gloves
What is the main risk of live working?
An open circuit
A short circuit
An earth fault
An electric shock
Which degree of risk has the potential to kill or cause permanent disability?
Low
High
Medium
Very low
Which is the peak value of a sinusoidal waveform?
RMS
Form factor
Amplitude
Mean value
What does ''phase lead' mean in relation to sinusoidal voltage and current waveforms?
The current peaks before the voltage
The current and voltage have the same peak value
The current and voltage operate at the same frequency
The waveforms reach their peak at the same time
Which passive component is used for power factor correction?
Inductor
Capacitor
Resistor
Reluctor
Which are the main requirements for the installation of capacitors?
Rated output and losses
Insulation level and tolerance
Working voltage and current
Lightning impulse and frequency
Which effect is a result of low power factor?
Improved efficiency of motor drives
Decreased operational costs
Decreased supply voltage
Increased current in supply cables
Which is a source of harmonics in an a.c system?
Power cables
Inverter controllers
LED lamps
Filter systems
Which is the correct angle of rotation between the phase voltages, generated by a three phase alternator?
360°
180°
120°
60°
What is an effect of a high impedance in the neutral conductor in a three-phase four-wire system, supplying an unbalanced load (where MEN earthing is used)?
Improve the earth fault loop impedance
Improve the supply power factor
Reduce electricity costs
Limit the current flow
Which is the most common load in a three-phase industrial power system?
Emergency lighting
Induction motors
Alarm systems
Synchronous motors
Which electrical SI unit is used for apparent power?
Joule
Watt
Volt Ampere
Reactive Volt Ampere
What is the RMS value of a sinusoidal waveform that has a peak of 170 V?
100 V
120 V
150 V
170 V
What is the capacitive reactance of a 0.22 µF capacitor when connected to a 60Hz AC supply?
4 kΩ
8 kΩ
12 kΩ
16 kΩ
What is the main reason for making sure a control system is isolated before removing any sensors?
To avoid damaging the sensors
To make sensor removal simple
To comply with company procedures
To stop output devices starting by accident
What must be done before removing a faulty component of a control system?
Notify the supervisor
Isolate all power supplies
Ensure test instruments are available
Ensure the correct replacement part is available
Which device is an electronic control unit?
Pneumatic cylinder
Hydraulic pump
PLC
Electric motor
What must be available when lead acid batteries are being charged?
Distilled water
Adequate ventilation
Test instruments
Manufacturer's handbook
What type of transducer produces an EMF when two dissimilar metals are joined.
Thermistor
Thermocouple
Thermometer
Thermal lance
What is the main purpose of a method statement?
To prioritize work in the correct order
To provide a list of resources for a task
To enable high risk work to be done safely
To confirm the work has been done safely
In a Capacitor start single phase motor the purpose of capacitor is
To discharge excess energy
To increase current
To store excess energy
To create a phase displacement
