WorksheetsForm B - PEM
Total questions: 30
Worksheet time: 15mins
What is the term used to describe a situation where the level of the source of supply is located above the centre line of the pump?
Suction lift.
Suction head.
Total static head.
Total dynamic head.
The velocity of the fluid in a centrifugal pump is developed by the pump's
casing.
impeller.
wearing rings.
impeller shrouds.
To ensure a proper operation of a centrifugal pump, it must be primed
after each trial run.
after each operation.
before each operation.
before each overhauling.
Refer to Fig. 04. Identify the type of screw pump shown.
Single screw pump.
Double screw pump.
Triple screw pump.
Internal screw pump.
The air-operated diaphragm pump will stall when the
air pressure is equal to the pump suction pressure.
air pressure is equal to the pump discharge pressure.
air pressure is higher than the pump suction pressure.
air pressure is higher than the pump discharge pressure.
Refer to Fig.12. Identify the type of coupling shown.
Spider coupling.
Flange coupling.
Universal coupling.
Pin and rubber bush coupling.
Refer to Fig. Identify the method of coupling alignment shown?
Reverse dial method.
Rim and face method.
Laser alignment method.
Straight edge and feeler gauge method.
The accuracy of the laser shaft alignment method is up to
1/10 mm.
1/100 mm.
1/1000 mm.
1/10000 mm.
In vibration analysis, waveform is a graphical presentation of vibration amplitude as a function of
time.
order.
degree.
velocity.
The measurement of the distance moved by a vibrating object is known as
Cycle.
Phase.
Frequency.
Displacement.
Refer to Fig. Identify the vibration transducer shown.
Air transducer.
Velocity transducer.
Displacement transducer.
Accelerometer transducer.
Which one of the following statements BEST describes the advantage to use infrared thermography?
Easy to use.
Less expensive.
Non-contact measurement.
Anyone can interpret the results.
Which one of the following techniques is used to monitor the thermal patterns of equipment while running under full load?
Penetrant test.
Ultrasonic test.
Laser alignment.
Infrared Thermography.
Boyle's law states that if a given mass of gas is compressed or expanded at a constant temperature, then the absolute pressure is
directly proportional to the volume.
inversely proportional to the volume.
directly proportional to the absolute temperature.
inversely proportional to the absolute temperature.
Which one of the following air drying processes is a physical process that uses gel as the drying agent?
Absorption drying.
Regenerative Adsorption drying.
High temperature drying.
Low temperature drying.
The magnetic detection tester is effective for checking
core defects on ferrous metals.
surface defects on ferrous metals.
core defects on non-ferrous metals.
surface defects on non-ferrous metals.
The oldest and simplest non-destructive testing method is
red dye penetrant test.
visible dye penetrant test.
fluorescent penetrant test.
oil and whitewash penetrant test.
The property of a metal that can withstand sudden shock is
ductility.
hardness.
toughness.
brittleness.
Refer to Fig. What is the type of mechanical property test shown?
Charpy test.
Brinell hardness test.
Vickers hardness test.
Knoop micro hardness test.
Which one of the following components or tools is made of cast iron?
Hand file.
Hand tap.
Lathe bed.
Cold chisel.
Which one of the following types of vacuum pump has a quiet operation and cooler air output?
Piston type.
Diaphragm type.
Rotary vane oil-less type.
Rotary vane lubricated type.
Metering pumps are classified into two main types: diaphragm and
vane.
screw.
plunger.
centrifugal.
The rotating seal face of a mechanical seal is usually made of
carbon.
ceramic.
cast iron.
stainless-steel.
What is the cause, if air bubble appears at the discharged end of an air-operated diaphragm pump?
A sticky air valve.
A ruptured diaphragm.
A clogged exhaust muffler.
An obstruction in the discharge.
Which one of the following maintenance practices requires monitoring of some condition-indicating parameter of the machine being maintained?
Predictive maintenance.
Corrective maintenance.
Preventive maintenance.
Breakdown maintenance.
Which one of the following terms in planned maintenance system where its reports can be used to pian future maintenance as well as to judge the suitability of the machine for the job?
Control cycle.
History record.
Job specification.
Maintenance programme.
Refer to Fig. Name the part 'A' of a single-stage air compressor as shown.
Piston.
Cylinder.
Crankshaft.
Outlet valve.
In the oil-less rotary screw type air compressor, what is the component that is used to position and drive the rotors as well as maintaining a 0.08 mm clearance between the rotors?
Oil separator.
Tìming gears.
Check Valves.
Water separator.
Which device is used to sense a hìgh or low pressure condition in the air receiver and relays an electrical signal to turn the compressor motor ON or OFF?
Relief valve.
Pressure switch.
Unloading valve.
Thermostatic valve.
Which one of the following symptoms is MOST likely the result of restricted flow at the discharge line of a rotary air compressor?
High dìscharge flow.
Compressor fails to start.
Low discharge temperature.
High discharge temperature.
