AME 9 End of Unit – SVE Study

AME 9 End of Unit Quiz

1 / 12

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

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.

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.

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

2 / 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.

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.

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.

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.

3 / 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

D. Ultrasonic flowmeter

A. Linear variable differential transformer (LVDT)

E. Proximity sensor

C. Thermocouple

4 / 12

With reference to a PT100 probe (resistance thermometer), why is it called a PT100 probe?

A. Platinum and 100 Ohms at 0°C: The "PT" stands for platinum, and "100" indicates that the probe has a resistance of 100 ohms at 0°C.

C. Platinum and 100 Wire Turns: The "PT" indicates the use of platinum, and "100" denotes the number of wire turns in the sensing element.

D. Platinum and 100 mm Length: The "PT" stands for platinum, and "100" refers to the length of the sensing element in millimeters.

B. Platinum and 100°C Measurement Range: The "PT" represents platinum, and "100" refers to the probe's capability to measure temperatures up to 100°C.

5 / 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.

6 / 12

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

B. Strain gauge

C. Flowmeter

A. Thermocouple

D. Pressure transducer

E. Tachometer

7 / 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.

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.

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

8 / 12

Which of the following transducers or measuring devices is suitable for accurate remote reading of a diesel engine exhaust temperature?

A. Thermocouple

D. Flowmeter

E. Strain gauge

B. Pressure gauge

C. Ultrasonic level sensor

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.

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.

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.

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

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

A. Pressure transducer

B. Thermocouple

E. Tachometer

D. Strain gauge

C. Flowmeter

11 / 12

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

D. Aluminum and copper.

C. Ceramic materials and metal oxides.

B. Iron and cobalt.

A. Silicon and gallium arsenide.

12 / 12

Describe how a Bourdon Tube can be utilized to measure temperature.

D. A Bourdon tube can measure temperature by directly converting temperature changes into mechanical movement, similar to its pressure measurement function.

C. A Bourdon tube can be used to measure temperature by connecting it to a temperature sensor, which then provides a temperature reading on the Bourdon tube’s dial.

B. By filling the Bourdon tube with a temperature-sensitive liquid, the expansion or contraction of the liquid is used to indicate temperature on a dial.

A. A Bourdon tube cannot be used to measure temperature as it is specifically designed for pressure measurement.

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