B1-2 Pumps And Compressors; Lubrication Flashcards
For quick starting, positive displacement standby pump will have:
A) the suction valve open and the discharge valve open
B) the vent and drain valves open
C) the suction valve and discharge valves closed
D) the suction valve open and the discharge closed
E) the suction valve closed and the discharge valve open
A) the suction valve open and the discharge valve open
Large centrifugal pumps should be started:
A) with the suction and discharge valves both open
B) with the suction and discharge valves both closed
C) with the suction and discharge valves 50% open
D) with the suction valve closed and the discharge valve open
E) with the suction valve open and the discharge valve closed
E) with the suction valve open and the discharge valve closed
Rotary and reciprocating pumps are examples of: A) turbine pumps B) regenerative pumps C) mixed flow pumps D) positive displacement pumps E) dynamic pumps
D) positive displacement pumps
Pumps that move a specific amount of liquid regardless of head include: A) mixed flow, volute and diffuser B) reciprocating, gear and rotary lobe C) centrifugal and rotary D) gear, lobe, diffuser, and mixed flow E) turbine and centrifugal
B) reciprocating, gear and rotary lobe
Pumps are generally classified into three groups, including: A) centrifugal, rotary and reciprocating B) reciprocating, gear and lobe C) gear, turbine and reciprocating D) turbine, rotary and lobe E) diffuser, reciprocating and rotary
A) centrifugal, rotary and reciprocating
The purpose of a diffuser in a centrifugal pump is to:
A) ensure the pump maintains its prime
B) change the pressure of the liquid to velocity
C) change the velocity of the liquid to pressure
D) counter balance the axial thrust of the impeller
E) reduce the pressure at the packing gland
C) change the velocity of the liquid to pressure
Volute, diffuser, axial flow, mixed flow and regenerative are all examples of: A) feedwater injector pumps B) rotary pumps C) reciprocating pumps D) centrifugal pumps E) positive displacement pumps
D) centrifugal pumps
The sum of pump static head and dynamic head is called the: A) total head B) combined head C) actually head D) friction head E) velocity head
A) total head
To reduce excessive leakage through the packing gland of a centrifugal water pump:
A) throttle the suction valve a little
B) tighten up the gland until all leakage has stopped
C) close down on the suction valve
D) tighten up the gland as far as possible
E) tighten up the gland to permit a slight amount of leakage
E) tighten up the gland to permit a slight amount of leakage
The inspection of an operating centrifugal water pump should ensure:
A) there is slight leakage from the stuffing boxes
B) the casing vent valve is partially open
C) the impeller is not rotating too rapidly
D) that the casing drain valve is partially open
E) that the suction valve is closed
A) there is slight leakage from the stuffing boxes
To reduce leakage between a pump shaft and casing, packing material is enclosed in a: A) seal cage B) packing chamber C) seal box D) casing box E) stuffing box
E) stuffing box
The purpose of a lantern ring in a centrifugal pump is to:
A) prevent moisture from entering the bearings
B) reduce the clearance between the impeller and the casing
C) carry oil from the sump to the bearing surface
D) secure the impeller to the pump shaft
E) prevent air leakage along the shaft
E) prevent air leakage along the shaft
Commonly used materials for pump wearing rings include: A) copper and Babbitt B) ceramic and stellite C) cast iron and bronze D) Teflon and PVC E) tool steel and stainless steel
C) cast iron and bronze
Typically, a centrifugal pump:
A) needs a lantern ring when “lifting” liquid
B) can lift water from very deep wells
C) can discharge water to a very high elevation with a single stage
D) will work well with a high negative suction head
E) is mainly used with lubrication systems
A) needs a lantern ring when “lifting” liquid
A major advantage of mechanical pump seals over packing is:
A) they are easily replaced when worn
B) they never wear out
C) they are less expensive
D) they do not result in shaft wear
E) they eliminate the need for sealing water when the pump is above the supply source
D) they do not result in shaft wear
The method of compressor control in which the motor runs constantly and air is compressed only between predetermined limits is called: A) constant acceleration control B) constant discharge control C) constant power control D) constant speed control E) constant pressure control
D) constant speed control
During startup, air compressors should be unloaded:
A) to prevent overloading of the motor
B) to prevent excessive stress on the compressor valves
C) to ensure proper operation of the suction valves
D) to ensure sufficient oil flow to compressor parts
E) to prevent cylinder overheating
A) to prevent overloading of the motor
An air compressor centrifugal unloader is used in conjunction with: A) free air unloader control B) suction unloader control C) start and stop control D) variable speed control E) constant speed control
C) start and stop control
A chemical typically utilized in compressed air dryers is: A) caustic soda B) hydrated lime C) silica gel D) sodium bicarbonate E) sodium sulphite
C) silica gel
The most suitable method of control for an air compressor that operates 25% of the time or less is: A) constant speed control B) suction unloader control C) free air unloader control D) start and stop control E) variable speed control
D) start and stop control
Inlet or discharge valves are NOT required on:
A) single acting compressors
B) single stage reciprocating compressors
C) double acting compressors
D) rotary lobe compressors
E) two stage reciprocating compressors
D) rotary lobe compressors
“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:
A) Canadian standards association
B) industrial accident prevention association
C) society of municipal fire marshals
D) occupational health and safety
E) national fire protection association code
E) national fire protection association code
In an air compression system, a moisture separator:
A) is at the compressor suction and contains silica gel drying agent
B) is a centrifuge at the compressor suction
C) is immediately downstream from the after cooler
D) is a trap on the bottom of the receiver
E) is between the compressor and the after cooler
C) is immediately downstream from the after cooler
High capacity steam turbines should be lubricated with oils that: A) have a low pour point B) have a low specific heat C) mix well with water D) have a very high viscosity E) are fire resistant
E) are fire resistant