AME 9 End of Unit – SVE Study

AME 9 End of Unit Quiz

1 / 12

Which of the following best explains how a strain gauge is connected into an electrical circuit to accurately measure pressure?

A. The strain gauge is connected directly to a power supply and a voltmeter to measure the voltage change due to pressure.

D. The strain gauge is connected to an amplifier that boosts the signal before it is measured by a multimeter.

B. The strain gauge is connected in a Wheatstone bridge circuit to measure the small changes in resistance accurately, which are then converted into pressure readings.

C. The strain gauge is connected in series with a resistor to form a simple voltage divider circuit.

2 / 12

3 / 12

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

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

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.

4 / 12

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

E. Flowmeter

D. Pressure transducer

B. Thermocouple

C. Ultrasonic thickness gauge

A. Strain gauge

5 / 12

Describe a flotation device that produces an output signal to remotely control the liquid level in a tank.

A. A weighted ball that drops as the liquid level decreases, sending a mechanical signal to a control valve.

C. A submerged probe that senses pressure changes and adjusts the liquid level accordingly.

D. A rotating vane that spins faster as the liquid level rises, generating an output signal based on speed.

B. A floating buoy that rises and falls with the liquid level, activating a switch to send an electrical signal to a control system.

6 / 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.

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

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.

7 / 12

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

B. Iron and cobalt.

D. Aluminum and copper.

A. Silicon and gallium arsenide.

C. Ceramic materials and metal oxides.

8 / 12

Which of the following best describes how the fluid level in a tank can be measured using ultrasound energy?

B. Ultrasound waves are transmitted towards the fluid surface, and the time it takes for the waves to reflect back to the sensor is used to calculate the fluid level.

D. Ultrasound waves are transmitted along the walls of the tank, and the difference in wave speed is used to measure the fluid level.

A. Ultrasound waves are transmitted into the fluid, and the time it takes for the waves to reach the bottom of the tank is measured to determine the fluid level.

C. Ultrasound waves are absorbed by the fluid, and the amount of energy absorbed is directly proportional to the fluid level.

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?

D. Ultrasonic flowmeter

B. Pressure transducer

A. Linear variable differential transformer (LVDT)

C. Thermocouple

E. Proximity sensor

10 / 12

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

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.

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

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.

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

A. Pressure gauge

C. Thermocouple

E. Tachometer

D. Strain gauge

12 / 12

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

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

A. They are highly sensitive to temperature changes.

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

C. They are prone to corrosion in seawater environments.

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