AME 9 End of Unit – SVE Study

AME 9 End of Unit Quiz

1 / 12

State a method of remotely measuring temperature onboard a marine vessel.

D. Using a mercury-in-glass thermometer mounted in the engine room.

C. Using a bimetallic strip connected to a local dial.

A. Using a thermocouple connected to a remote display unit.

B. Using a Bourdon tube connected to a manual gauge.

2 / 12

Which of the following transducers or measuring devices is suitable for accurately and remotely measuring the position of a diesel engine governor or fuel rack?

D. Ultrasonic flowmeter

E. Proximity sensor

A. Linear variable differential transformer (LVDT)

B. Pressure transducer

C. Thermocouple

3 / 12

With reference to an impeller-type flowmeter, describe how an output is produced and processed to provide a digital output in litres per minute.

B. The rotation of the impeller generates pulses, which are counted by a microcontroller and then converted into a digital readout of flow rate in litres per minute.

C. The impeller produces a varying resistance, which is converted directly into a digital signal proportional to flow rate.

A. The impeller generates a magnetic field, which is directly displayed on a digital screen as the flow rate.

D. The impeller spins a turbine, generating a digital signal that is directly proportional to the flow rate without further processing.

4 / 12

With reference to a thermistor, state the reason for their use on vessels.

C. To monitor the pH level of the water in the ballast tanks.

B. To detect and measure temperature changes in various systems.

A. To measure the concentration of dissolved gases in the water.

D. To measure the speed of the vessel through the water.

5 / 12

With reference to an impeller-type flowmeter, describe how an output is produced and processed to provide an analogue output in litres per minute.

B. The impeller rotation generates pulses, which are counted electronically and converted to an analogue voltage proportional to flow rate.

C. The impeller rotation creates a pressure differential, which is measured and converted directly into an analogue output.

A. The impeller rotates with the flow, generating a mechanical movement that is directly converted to an analogue dial reading.

D. The impeller produces heat due to friction, which is sensed and converted to an analogue signal indicating flow rate.

6 / 12

State a typical application for a bi-metallic strip.

C. Flow meters for liquids

D. Vibration dampers in machinery

B. Pressure sensors in hydraulic systems

A. Temperature gauges and thermostats

7 / 12

Which of the following are advantages of using ultrasound to measure the fluid level in a tank? (Select TWO)

D. Requires regular calibration due to sensitivity to environmental conditions.

B. High sensitivity to temperature changes, providing more accurate readings.

E. Limited to measuring only transparent fluids.

A. Non-contact measurement, reducing the risk of contamination.

C. Ability to measure fluid levels in tanks with corrosive or hazardous materials.

8 / 12

Explain how a potentiometer can be used to measure rotary movement.

A. By using a linear resistive track that moves in response to rotational movement, changing the resistance to measure angular displacement.

D. By utilizing a rotating coil and stationary magnetic field to measure changes in magnetic flux, which correlates to the angular position.

B. By converting rotational movement into a variable resistance through a rotating wiper that contacts a resistive element, which then provides a corresponding voltage output.

C. By detecting changes in the capacitance of a rotating capacitor, which is then converted into a voltage signal proportional to angular displacement.

9 / 12

Describe the operation of a thermocouple.

A. Two Dissimilar Metals Produce a Voltage: A thermocouple operates by generating a voltage when two dissimilar metals are joined together and exposed to different temperatures, with the voltage being proportional to the temperature difference.

D. Temperature-Induced Magnetic Fields Generate Voltage: A thermocouple operates by creating a voltage from temperature-induced magnetic fields in the metal, with the voltage reflecting the temperature changes.

B. A Single Metal Expands with Temperature: A thermocouple operates by measuring the expansion of a single metal as temperature changes, with the expansion directly indicating the temperature.

C. Electrical Resistance Changes with Temperature: A thermocouple operates by measuring changes in the electrical resistance of a single metal conductor, with resistance changes correlating to temperature variations.

10 / 12

Describe a Bourdon Tube.

D. A temperature sensor that operates based on the change in electrical resistance of a material as it is exposed to varying temperatures.

A. A device used for measuring temperature by expanding or contracting a metal strip in response to thermal changes.

B. A pressure-sensing instrument that uses a curved metal tube which straightens as pressure increases, with the resulting movement used to indicate pressure on a dial.

C. A device used for measuring fluid flow by detecting the rate of rotation of a set of gears immersed in the fluid.

11 / 12

Which of the following is a disadvantage of using capacitance probe sensors on a marine vessel?

D. They may give inaccurate readings if the liquid has a variable dielectric constant.

C. They are prone to corrosion in seawater environments.

A. They are highly sensitive to temperature changes.

B. They require a large amount of space for installation.

12 / 12

Which of the following transducers or measuring devices is suitable for remote reading of a ship’s intermediate shaft bearing temperature?

A. Thermocouple

D. Pressure transducer

B. Strain gauge

E. Tachometer

C. Flowmeter

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