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WorksheetsElectroSync_Quiz for LPU
Total questions: 30
Worksheet time: 30mins
What is the unit of resistance?
Ohm
Watt
Volt
Ampere
Which sensor detects temperature?
RTD
Proximity
Flow meter
LVDT
Typical analog signal in industry:
0–5 V
4–20 mA
0–24 V
440 V
A relay is used mainly for:
Amplifying signal
Switching high load
Data storage
Wi-Fi
PLC full form:
Programmable Logic Controller
Power Line Control
Process Load Calculator
None
Which device controls motor speed?
MCB
VFD
Contactor
Timer
Proximity sensor detects:
Light
Pressure
Nearby object
Temperature
SCADA is mainly used for:
Office automation
Machine monitoring
Gaming
Internet
Which is a digital signal?
0 or 1
4–20 mA
0–10 V
230 V
LM35 is a:
Pressure sensor
Temperature sensor
Vibration sensor
Relay
LVDT measures:
Temperature
Displacement
Flow
PLC works on:
Ladder logic
HTML
SQL
Python only
HMI stands for:
Human Machine Interface
High Motor Input
Heat Measurement Indicator
None
Motor overload happens due to:
High current
Low voltage
Noise
Low current
Which communication is common in automation?
Modbus
Gmail
Bluetooth speaker
HDMI
Timer in PLC is used for:
Communication
Delay
Starting PC
Lighting
Flow is measured using a:
Orifice plate
RTD
Thermocouple
Relay
Standard PLC input voltage:
24V
220V
1V
P in PID stands for:
Pressure
Proportional
Power
Process
A VFD fault usually means:
Software issue
Electrical problem
Internet issue
Display colour change
A sensor does which of the following?
It detects changes in the environment.
It stores data permanently.
It displays information to users.
It powers electronic devices.
Automation in simple words is:
The use of machines or technology to do tasks without human intervention.
A way to increase manual labor in factories.
A process that always requires human supervision.
A method to slow down production.
One difference between analog and digital signals is:
Analog signals are continuous, while digital signals are discrete.
Analog signals are always more accurate than digital signals.
Digital signals cannot be transmitted over long distances.
Analog signals use binary code, while digital signals do not.
We use 4–20 mA because:
it allows for easy detection of wire breaks and provides a standard signal range for industrial sensors.
it is cheaper than voltage signals.
it is only used for digital communication.
it is the only signal used in home appliances.
Name one field device used in industry.
Pressure transmitter
Laptop
Printer
Smartphone
A tank level sensor gives 8 mA. What might this mean?
The tank is empty or at its lowest level.
The tank is full.
The sensor is malfunctioning.
The tank is at half capacity.
Name one reason a motor does not start.
A blown fuse
A loose belt
Excessive lubrication
Overheating
Suggest a sensor to detect metal and why.
A capacitive sensor is suitable for detecting metal because it senses changes in capacitance caused by metal objects.
A temperature sensor is suitable for detecting metal because it measures heat emitted by metals.
A humidity sensor is suitable for detecting metal because it detects moisture on metal surfaces.
An inductive sensor is suitable for detecting metal because it senses changes in electromagnetic fields caused by metal objects.
A temperature value on screen is flickering. What will you check first?
Check the wiring connections to the temperature sensor.
Replace the display screen immediately.
Ignore the issue as it is not critical.
Increase the temperature setpoint.
PLC input shows ON even when switch is OFF. What can be the cause?
Wiring short circuit
Switch is faulty
PLC program error
Power supply fluctuation
