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9 Cards in this Set
- Front
- Back
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Using electricity for control purposes has the following advantages: 1. It is readily available 2. The wiring is usually simple and easy to install 3. Signals from sensing elements can produce one output 4. Controller/actuators do not require an air supply 1) 2,3,4 2) 1,3,4 3) 1,2,4 4) 1,2,3 5) 1,2,3,4 |
3) 1,2,4 |
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In electric switch configuration the term "contact arrangement" refers to: 1) Normally open or normally closed position 2) Double or single pole switches 3) Switches mounted vertically or horizontally 4) Switches in series or parallel 5) Relay contacts |
Normally open or normally closed position |
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Control motors are divided into two classifications: 1) Valve operators and damper operators 2) High voltage and low voltage 3) Large and small 4) Pump and fan controllers 5) AC and DC |
Valve operators and damper operators |
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Thermostats may be classified according to their: 1) Application 2) Type of control action provided 3) Temperature range 4) Type of temperature sensing element 5) All of the above |
5) All of the above |
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The bimetal sensing element consists of a strip made up of two thin layers of metal with: 1) Widely different rates of thermal conductivity 2) Slightly different rates of thermal conductivity 3) Slightly different rates of thermal expansion 4) Similar rates of thermal expansion 5) Widely different rates of thermal expansion |
Widely different rates of thermal expansion |
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Pressure controllers can be divided into two classes: 1) High and low pressure 2) High and low flow 3) Inside and outside mounting 4) High and low temperature 5) Horizontal or vertical mounting |
High and low pressure |
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A device used to position dampers and control valves is termed: 1) An actuator 2) A temperature controller 3) A transformer 4) A relay 5) A controller |
An actuator |
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A bimetal thermostat's operating range is between: 1) 5 and 40ºC 2) 50 and 90ºC 3) 0 and 40ºC 4) 0 and 50ºC 5) 10 and 32ºC |
10 and 32ºC |
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On-off thermostats are equipped with: 1) A high temperature switch 2) An open contact switch 3) A low voltage switch 4) A low temperature switch 5) A high voltage switch |
An open contact switch |
