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WorksheetsMEC_MOCK CBT
Total questions: 58
Worksheet time: 1hrs 19mins
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
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 driven 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 type of architectural drawing is used to locate communication services?
Standard drawing.
Detailed drawing.
Floor plan.
Site plan.
What is the main purpose of a technical standard?
To accept uniform accredited criteria.
To specify individual national standards.
to increase revenue from international trade.
To decrease environmental impact.
What is a safe working practice when regularly using a VDU or a workstation?
Keep the work area clean.
Perform a stability test.
Use the correct seating position.
test for electrical faults.
What is the first action to take to identify a computer system problem?
Increase memory size.
Run a diagnostic program.
Update the operating system.
Check peripheral devices.
What is the main consideration when selecting the type of PLC for an
application?
The operating environment.
The cost of the PLC.
the input/output requirements.
the physical size of the PLC.
What type of control system is Proportional Integral Derivative (PID)?
digital
on/off
binary coded
feedback
What is the main use of Boolean algebra?
To describe logic functions.
To generate computer programs.
To design logic circuits.
To fault find on digital circuits.
What is a 'Full dry run' used for in relation to PLC programs?
To display its control functions.
To allocate the inputs/outputs.
To prove its operation.
To edit the code.
Which device is used to store a PLC program?
PIO
EEPROM
CPU
ROM
Which is a basic IT security measure?
Search Criteria
Error Message
Edit Function
Encryption
What is the main purpose of the print manager?
To monitor printer paper usage.
To provide the status of print jobs.
To identify network printers.
To facilitate printer connection.
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.
nfra-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 degrees
180 degrees
120 degrees
60 degrees
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
120 V
170 V
What is the capacitive reactance of a 0.22 μF capacitor when connected to a 60
Hz AC supply?
4 kΩ.
8 kΩ.
12 kΩ.
16 kΩ.
Which units of measurement does a conductor use?
ohms
amperes
volts
watts
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.
Which type of instrument sensor is most likely to be used to detect the fluid
level in a tank?
Inductive proximity detector.
Capacitive proximity detector
Level switch.
Microswitch.
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.
What is an EPROM used for?
Storing data.
Converting data.
Processing data.
Transmitting data.
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 is the main purpose of using factory passwords?
To prevent unauthorized process operation.
To facilitate ease of maintenance.
To increase output production.
To comply with company policy.
Which type of check is a dynamometer program used for?
Fluid level.
Oil pressure.
Supply voltage.
Power output.
What type of control unit is used for a dedicated control function?
PC-based.
Microcontroller.
ASIC.
PLC.
What type of transducer produces an EMF when two dissimilar metals are joined
and heated?
Thermistor
thermocouple.
Thermometer.
Thermal lance.
What are the main features of a microcontroller?
Memory, AD/DA converters, oscillator.
Microprocessor, serial interface, timer.
Memory, microprocessor, I/O.
I/O, timer, oscillator
What is used to obtain a replacement component?
Supplier's catalogue.
Maintenance handbook
Instruction book.
Inventory.
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
