AME 9 End of Unit – SVE Study

AME 9 End of Unit Quiz

1 / 12

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

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.

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

2 / 12

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

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

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

E. Limited to measuring only transparent fluids.

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

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

3 / 12

Which of the following transducers or measuring devices is suitable for accurately measuring the twist of a propeller shaft?

C. Ultrasonic thickness gauge

B. Thermocouple

A. Strain gauge

D. Pressure transducer

E. Flowmeter

4 / 12

State a method of remotely measuring the rate of flow onboard a marine vessel.

A. Using an orifice plate with a local differential pressure gauge.

B. Using a rotameter with a manual scale.

C. Using an electromagnetic flow meter with a digital output to a control panel.

D. Using a Venturi meter with a mechanical dial indicator.

5 / 12

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

D. Strain gauge

A. Pressure transducer

B. Thermocouple

C. Flowmeter

E. Tachometer

6 / 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.

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.

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

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.

7 / 12

Which of the following transducers or measuring devices is suitable for measuring the speed of a ship’s main propeller shaft in RPM?

E. Flowmeter

D. Temperature sensor

C. Strain gauge

B. Pressure transducer

A. Tachometer

8 / 12

With reference to a PT100 probe (resistance thermometer), how is the sensing element typically constructed?

D. Resistance Film on a Plastic Substrate: The sensing element consists of a thin film of resistive material deposited on a plastic substrate. The resistance changes with temperature, which is used to determine the temperature.

A. Platinum Wire Wrapped Around a Ceramic Core: The sensing element consists of a thin platinum wire wound around a ceramic core. The resistance of the platinum wire changes with temperature, and this change is used to measure temperature.

C. Thermocouple Wires in a Metal Housing: The sensing element comprises two different metal wires joined together in a metal housing. The temperature is measured using the thermoelectric effect.

B. Copper Wire Embedded in a Glass Tube: The sensing element is made of copper wire placed inside a glass tube. The temperature is measured by changes in the electrical resistance of the copper.

9 / 12

Describe a Bourdon Tube.

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.

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

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

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

10 / 12

11 / 12

Which of the following transducers or measuring devices is suitable for measuring a simple local pressure reading of a ship’s fire-main?

B. Flowmeter

D. Strain gauge

A. Pressure gauge

C. Thermocouple

E. Tachometer

12 / 12

With reference to a thermistor, state the materials used in their construction.

D. Aluminum and copper.

A. Silicon and gallium arsenide.

C. Ceramic materials and metal oxides.

B. Iron and cobalt.

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