Compressor unloaders:
a. Could close the discharge valve
b. Must be used on centrifugal compressors
c. Could keep the suction valve open
d. Activate the stop and start button
e. Are located on the driver of the compressor
Answer: C
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Power Engineering Chapter 75
- If there is a shut-off valve between the aftercooler and the receiver, the aftercooler must be fitted with a?
- Intercoolers should be provided with what on the cooling water side?
- Reasons for cooling of air in a compressor is?
- The use of an intercooler to cool the air between stages of compression will reduce the power required for compression by around __ %.
- Which compressor has moving blades attached to the rotor, alternating with fixed blades attached to the casing?
- Disadvantage of centrifugal compressor is?
- The rotary screw compressor uses multistage designs when the pressure is above ___ kpa.
- The rotary screw compressor is suitable for high speeds ranging from __ to __ r/min.
- Which compressor features two intermeshing rotors contained within a close fitting casing?
- Rotary lobe compressor single-stage pressure is __ kPa and __ kPa for two-stage.
- Rotary lobe compressor runs at speeds of __ r/min:
- Which compressor has two figure-eight shaped impellers revolving in opposite directions within a casing?
- The sliding vane compressor disadvantages are?
- Which compressor must have intake and discharge valves to control the flow of air entering and leaving?
- Which compressors are dynamic type?
- Air receivers
- An air receiver used in an air compression, system will perform the following functions: 1. act as a storage vessel 2. eliminates pulsation in discharge lines 3. will separate out water from the air 4. controls the temperature of the air before it enters the system
- Where pistons move in a cylinder it is necessary for the lubricant to provide
- The valves on a reciprocating compressor are opened by
- Relative to a dry-pipe fire system, an automatic air supply shall be connected so that proper pressure can be maintained in each system, is a statement of the
- Higher gearing is commonly used on
- Single stage reciprocating air compressors
- Positive displacement air compressor types are
- Compressed air machinery would most likely be used in
- To reduce air temperature between stages, we would use: