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10 Cards in this Set
- Front
- Back
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Which of the following statements about steam distributing coils is true? 1) The coils cannot be used where freezing air temperatures are frequently encountered over the coil 2) The coils never freeze 3) The coils distribute steam evenly over the entire coil 4) The coils are used when steam cannot be throttled 5) The coils can only have same end connections |
The coils distribute steam evenly over the entire coil |
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Which one of the following methods is not a method of ensuring uniform steam distribution in steam coils? 1) Installation of distributing plates within the steam header 2) Once called "non-freeze coils" 3) Controlling the face velocity of the air flowing over coils 4) Installation of individual orifices into the supply end of each tube 5) "Steam distributing" coils |
Controlling the face velocity of the air flowing over coils |
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The most commonly used types of water coil circuiting are: 1) Parallel and serpentine 2) Full circuit, double circuit, and triple circuit 3) Parallel, counter flow, and serpentine 4) Single serpentine, double serpentine, and half serpentine 5) Single serpentine, double serpentine, and triple serpentine |
Single serpentine, double serpentine, and half serpentine |
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Which type of coil circuiting is designed to produce a high heat capacity with limited water quantity? 1) Half serpentine 2) Face velocity 3) Double serpentine 4) Single serpentine 5) Steam coil |
Half serpentine |
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Double serpentine water coil circuiting is used: 1) In applications requiring low water velocities and low water pressure drops 2) For any water velocity in the tubes 3) Where the water velocity in the tube is less than 0.3 m/s 4) Where the water velocity in the tubes is more than 2.4 m/s 5) Where the water velocity in the tubes is between 0.3 and 2.4 m/s |
Where the water velocity in the tubes is more than 2.4 m/s |
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Which of the following statements about coil surfaces is false? 1) All fins must be crimped 2) Fins increase the contact surface area between the air stream and the tubes 3) Air flows across the fins 4) Finned coils are more compact than smooth tube coils of the same capacity 5) Finned coils are less expensive than smooth coils of the same capacity |
All fins must be crimped |
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Half serpentine water coil circuiting is used: 1) Where the water velocity in the tubes is between 0.3 and 2.4 m/s 2) For any water velocity in the tubes 3) Where the water velocity in the tubes is more than 2.4 m/s 4) In applications requiring high water velocities and low water pressure drops 5) Where the water velocity in the tubes is less than 0.3 m/s |
Where the water velocity in the tubes is less than 0.3 m/s |
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Fin spacing of 1.814 to 6.35 mm is most normally used in which of the following cases? 1) Steam and hot water heating coils 2) Refrigerant condenser coils 3) Direct expansion coils for low temperature applications 4) Cooling refrigerant coils 5) Chilled water cooling coils |
Steam and hot water heating coils |
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Finned tube coils in air handling systems are often called: 1) Extended surface coils 2) Fish coils 3) Bare tube soils 4) Cooling coils 5) Heating coils |
Extended surface coils |
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Single serpentine water coil circuiting is used: 1) Where the water velocity in the tubes is more than 2.4 m/s 2) For any water velocity in the tubes 3) Where the water velocity in the tubes is less than 0.3 m/s 4) In applications requiring high water velocities and low water pressure drops 5) Where the water velocity in the tubes is between 0.3 and 2.4 m/s |
Where the water velocity in the tubes is between 0.3 and 2.4 m/s |
