WorksheetsMechatronics Course 2 Final Exam
Total questions: 50
Worksheet time: 25mins
A pulley system with two supporting strands has a mechanical advantage of:
1
2
3
4
The device used to transfer rotary motion between non-parallel shafts is a:
Spur gear
Bevel gear
Worm gear
Rack and pinion
A keyed shaft is used in mechanical systems to:
Reduce friction
Aid heat transfer
Prevent slippage between the shaft and hub
Lubricate bearings
Increasing the diameter of a drive gear will:
Increase speed output
Decrease speed output
Have no effect
Reduce torque
Torque is best defined as:
Linear force
Pressure × volume
Rotational force
Energy per unit time
A timing belt is designed to:
Slip under load
Operate silently
Maintain exact synchronization between shafts
Carry heavy loads only
A bearing failure often results in:
Lower friction
Decreased temperature
Increased vibration
Reduced load
Which coupling absorbs misalignment between shafts?
Rigid coupling
Flexible coupling
Gear coupling
Direct coupling
Which metal is commonly used for high-strength gears?
Aluminum
Copper
Stainless steel
Brass
A torque limiter in a machine is designed to:
Increase RPM
Protect equipment from overload
Reduce lubrication
Increase friction
The unit of hydraulic pressure is:
Ampere
PSI
Ohm
Hertz
In a hydraulic system, doubling the piston area will:
Cut force in half
Double the force
Double the flow rate
Increase voltage
Pneumatic systems generally operate at pressures between:
10–30 psi
40–60 psi
80–120 psi
200–500 psi
A flow control valve regulates:
Pressure
Speed of an actuator
Voltage
Oil temperature
A directional control valve symbol with three boxes indicates:
Three actuators
Three flow rates
Three positions
Three pressure levels
Air compressors must be drained to remove:
Excess air
Oil
Water from condensation
Nitrogen
A hydraulic accumulator stores:
Voltage
Hydraulic energy
Air
Gear lubricant
Cavitation is caused by:
High voltage
Excess vibration
Low fluid pressure allowing vapor bubbles to form
Metal shavings in oil
A pneumatic cylinder extends due to:
Electrical force
Magnetic force
Pressurized air
Gravity
Which valve automatically returns a cylinder to its home position?
Check valve
Solenoid valve
Spring-return valve
Gate valve
A photoelectric sensor detects objects using:
Sound
Light
Pressure
Magnetism
A proximity sensor that detects magnetic fields is a:
Ultrasonic sensor
Capacitive sensor
Inductive sensor
Reed switch
The purpose of a relay is to:
Step voltage up
Control a high-power circuit with a low-power signal
Store energy
Measure pressure
A transistor used as a switch is controlled by its:
Emitter
Base/gate
Collector
Drain only
PWM stands for:
Pulse Width Modulation
Power Wave Monitor
Progressive Wave Measurement
Phase Width Meter
A voltage divider is used to:
Increase voltage
Split an input voltage into smaller portions
Store charge
Reduce resistance
A solenoid converts:
Light into sound
Electricity into linear motion
Air pressure into electricity
Voltage into torque
Which sensor is best for detecting water levels?
Capacitive sensor
Inductive sensor
Photoelectric sensor
Ultrasonic sensor
A thermistor changes resistance based on:
Light
Temperature
Pressure
Motion
What does hysteresis prevent in a sensor system?
Temperature changes
Switching too rapidly
Voltage drop
Power loss
A microcontroller differs from a PLC because it:
Is more rugged
Handles higher voltages
Is less industrial and more programmable
Cannot control outputs
An analog signal includes values:
Only 0 or 1
Between 0–5 V or 0–10 V
Only at full scale
Only when switching
The most common industrial analog range is:
0–1 V
0–5 V
10–100 V
4–20 mA
A limit switch is classified as what type of sensor?
Non-contact
Mechanical contact
Optical
Analog only
A solenoid valve uses an electromagnetic coil to:
Detect pressure
Move a plunger that shifts the valve
Increase flow
Cool the system
A robot joint is also known as a:
Axis
Pixel
Conductor
Bit
Teach mode is used to:
Program robot movement through demonstration
Store analog signals
Adjust motor voltage
Test emergency stops
The home position of a robot is typically:
Random
Defined zero reference point
Selected by the PLC
The farthest reach
In ladder logic, a coil represents:
A power supply
An output
A sensor
An analog value
A normally closed (NC) contact allows current to flow when the input is:
On
Off
Delayed
Pulsed
A robot's DOF refers to its:
Weight
Degrees of freedom
Speed range
Voltage rating
A PLC scans in what order?
Outputs → Inputs → Logic
Inputs → Logic → Outputs
Logic → Outputs → Inputs
Memory → Outputs → Logic
A robot joint limit prevents:
Overtravel
Data loss
Gripper pressure
Motor cooling
A PLC timer that begins counting when the input goes true is a:
TON
TOF
RTO
RTE
End effectors include:
Motors and pumps
Grippers, welders, and tools
Sensors only
PLCs
A schematic symbol with three lines converging at a point represents a:
Relay
Ground
Capacitor
Switch
The first step in troubleshooting a machine is to:
Replace all wiring
Review safety and lockout procedures
Remove guards
Increase voltage
A digital multimeter reading of “OL” indicates:
Zero volts
Overload or open circuit
Reverse polarity
No power in the meter
The manufacturing process that removes material from a part is:
Casting
Milling
3D printing
Sintering
The most important factor in preventive maintenance is:
Running machines at maximum speed
Regular inspections and lubrication
Changing all components annually
Increasing production quotas
