An orifice plate is the most common form of restriction that is used in flow measurement.
a. True
b. False
Answer: A
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3rd Class A2 Chapter 12
- A continuous air supply is provided to the differential pressure transmitter so that the level of liquid in the tank can be converted into a constant proportional air signal.
- When diaphragms are used as sensing devices to measure level the low-pressure side is filled with a sealing fluid.
- Rotary type positive displacement meters are independent of temperature, pressure and specific gravity.
- The most undesirable feature of the orifice plate is the high permanent pressure loss that is created due to the turbulence in the flow across the orifice plate.
- Venturi tubes will handle about 20% more flow than an orifice plate with the same pipe size and the same differential pressure.
- The pressure differential across an orifice plate is measured by a low-pressure connection before the plate and a high-pressure connection after the plate.
- Bellows type elements are generally used to measure pressures below 350 kPa
- Double Bourdon tube gauge is used to measure vacuum only.
- The optical pyrometer operates on the principle that the color of a hot object is a measure of its temperature.
- Iron and constantan can be used in a thermocouple to measure any temperature range.
- The coefficient of expansion of aluminum is higher than copper.
- Bimetal thermometers consist of two thin metal strips bonded together. The metal strips welded together must have a small difference in their coefficient of expansion.
- Float-type manometers:
- What is the flow when the differential pressure is 81% of designed maximum?
- When diaphragms are used as sensing devices to measure level the low-pressure side is filled with:
- Float cage units are used:
- Glass thermometers with a mercury fill are sometimes pressurized with nitrogen so it:
- A Bourdon tube has an oval cross section, which is often shaped in the form of a "C", having an arc span of about:
- A continuous air supply is provided to the differential pressure transmitter so that the _____ of liquid in the tank can be converted into a constant proportional air signal.
- If a container holds 1 m3 of water having a mass density of 1000 kg per m3, what pressure would be exerted on the base of the container whose area is 1 m2?
- The pressure differential across an orifice plate is measured by a _____ connection before the plate and a _____ connection after the plate.
- When using the float-type manometer, the differential pressure across the U-tube is greatest when the level in the steam drum is:
- Rotary type positive displacement meters are independent of temperature, pressure and _____.
- Oil or mercury are sometimes used in thermowells to: