Bimetal thermometers are sometimes wound in the form of a helix to:
a. Increase the distance of the scale.
b. Decrease the temperature range.
c. Decrease the rotation of pointer.
d. Increase the accuracy of temperature reading.
e. Increase the range of the scale.
Answer: D
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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.
- An orifice plate is the most common form of restriction that is used in flow measurement.
- 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: