AME 9 End of Unit – SVE Study

AME 9 End of Unit Quiz

1 / 12

Which of the following best describes the principle and operation of a simple strain gauge?

B. A strain gauge measures temperature by detecting changes in electrical resistance when a material is heated.

C. A strain gauge measures strain by detecting changes in electrical resistance as the material to which it is attached is stretched or compressed.

D. A strain gauge measures pressure by detecting changes in magnetic flux when a material is under stress.

A. A strain gauge measures force by detecting changes in capacitance when a material is deformed.

2 / 12

Describe the operation of a thermocouple.

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.

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.

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.

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.

3 / 12

With reference to a PT100 probe (resistance thermometer), which principle of operation allows it to measure temperature?

C. Capacitance Variation: The PT100 probe measures temperature by detecting changes in capacitance between two conductive plates as the temperature changes.

D. Optical Emission: The PT100 probe operates on the principle that it measures temperature by analyzing the optical emissions of a material, which vary with temperature.

A. Change in Electrical Resistance: The PT100 probe measures temperature based on the principle that the electrical resistance of platinum increases with temperature. The probe’s resistance is measured and converted into a temperature reading.

B. Thermoelectric Effect: The PT100 probe operates on the principle that a voltage is generated when two different metals are joined and subjected to a temperature gradient, which is then used to measure temperature.

4 / 12

With reference to a PT100 probe (resistance thermometer), why do these probes typically have three or four wires to connect them to the temperature indicating device?

B. To Allow for Multiple Temperature Ranges: The extra wires enable the probe to measure temperatures across multiple ranges simultaneously.

D. To Enable Multiple Probes to Be Connected: The extra wires allow for connecting multiple PT100 probes to a single temperature indicating device.

A. To Compensate for Lead Wire Resistance: The additional wires are used to compensate for the resistance of the lead wires, ensuring accurate temperature measurements by measuring only the resistance of the sensing element itself.

C. To Improve the Mechanical Strength of the Connection: The additional wires are used to strengthen the physical connection between the probe and the temperature indicating device.

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.

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

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

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

6 / 12

Which of the following transducers or measuring devices is suitable for remote reading of lubricating oil pressure in a diesel engine?

A. Pressure transducer

D. Strain gauge

E. Tachometer

C. Flowmeter

B. Thermocouple

7 / 12

State ONE limitation of the thermocouple, and how this limitation is overcome in practice.

A. Limited Accuracy; Use of Calibration: Thermocouples have limited accuracy compared to other temperature sensors, but this is overcome by regularly calibrating the thermocouple to ensure accurate measurements.

C. Susceptibility to Electromagnetic Interference; Use of Shielded Cables: Thermocouples can be affected by electromagnetic interference, but this issue is addressed by using shielded cables to protect the signal.

D. Limited Temperature Range; Use of Special Alloys: Thermocouples may have a limited temperature range, but this is overcome by using special alloy types designed for high or low-temperature applications.

B. Slow Response Time; Use of Insulation: Thermocouples can have a slow response time to temperature changes, but this is mitigated by insulating the thermocouple to reduce heat transfer delays.

8 / 12

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

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

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

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

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

9 / 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?

B. Pressure transducer

E. Proximity sensor

C. Thermocouple

D. Ultrasonic flowmeter

A. Linear variable differential transformer (LVDT)

10 / 12

Describe how bi-metallic strips are utilized to measure temperature.

C. The bi-metallic strip changes its color based on the temperature, providing a visual indication of the temperature level.

B. The bi-metallic strip generates an electrical signal proportional to the temperature, which is then converted to a temperature reading by an electronic device.

A. The bi-metallic strip bends in response to temperature changes, and this bending movement operates a mechanical pointer or switch to indicate the temperature.

D. The bi-metallic strip absorbs or releases heat, causing a change in its thermal conductivity, which is used to measure temperature.

11 / 12

Which of the following are uses of capacitance probe sensors on a marine vessel?
(Select TWO correct answers)

B. Measuring the flow rate of seawater in pipelines.

D. Measuring the temperature of engine components.

E. Monitoring the pressure of hydraulic systems.

C. Detecting the presence of water in the bilge.

A. Monitoring fuel tank levels.

12 / 12

State a typical application for a bi-metallic strip.

B. Pressure sensors in hydraulic systems

C. Flow meters for liquids

A. Temperature gauges and thermostats

D. Vibration dampers in machinery

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