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What is the usual cause of overheating in high speed, grease-lubricated antifriction bearing - ✔✔Faulty mounting practices
How can too much wear in gears be reduced - ✔✔Proper meshed
Why are timing belts made with teeth - ✔✔Doesn't slip
The insert, or spider, used in flexible jaw couplings is meant to - ✔✔Transmit torque and accept misalignment
Clutches on machinery provide for disengaging and may also - ✔✔Interrupt the power supply
What determines the selection of gear reducer size - ✔✔Torque and speed
why do metal parts seize when there is a lack of lubrication - ✔✔Metal to metal contact. (lube protects the bearing against corrosion)
What causes lubrication oil to get milky - ✔✔Mixing incompatible oils, contamination
Why are heavy oils used - ✔✔To reduce the friction from heat and wear
What is viscosity? - ✔✔The resistance of a liquid to flow
Which machine condition can be determined by using oil analysis? - ✔✔Various types of wear and take corrective action before fails
Acids that form in lubricants affect performance are a result of - ✔✔Oxygen from the air and high temperatures
Shutting fluid discharge of an air operated reciprocating pump will cause the pump to - ✔✔Overstroke
What is the pressure on a fluid - ✔✔Measurement of force per unit area on an object in the fluid
What can you use to meet peak hydraulic system demands - ✔✔A variable displacement pump
Pressure in the hydraulic system can be controlled electrically by the use of - ✔✔Metering the flow of fluid into or out
Hydraulic valves are typically adjusted by - ✔✔Flow control valve and adjustment the control
Hydraulic reservoir suction lines can be raised for what - ✔✔Create enough vacuum
When air is compressed its temperature and....? - ✔✔The pressure and temperature of the air increases
The speed of a piston is determined by - ✔✔Crankshaft stoke and the engine RPM
Safe operating speed of an air motor is controlled by the - ✔✔Air supply pressure
Air line filters and lubricators should be installed at - ✔✔closer where it is going to be used
Solenoid valve fails to open, check what? - ✔✔Normally closed (power to open)
Centrifugal pumps, cavitation can result in? - ✔✔Pump performance deterioration, mechanical damage, noise and vibration
What is a Megger - ✔✔the instrument used for measuring the resistance of the insulation
Trending is the process of? - ✔✔A trend is the general direction taken during a specified period of time..... Trend analysis is the process of looking at current trends in order to predict future ones and is considered a form of comparative analysis
Exclusive or logic circuit? - ✔✔is a logical operation that is true
A transducer is a device that converts? - ✔✔chemical or physical information into an electrical signal or the reverse
Size wire for 100-amp switch? - ✔✔2-gauge
Maximum total degrees of bends in conduit? - ✔✔ 360
What color is a torch flame when gas only is on? - ✔✔orange, yellow
Excess oil on a cylinder rod because? - ✔✔Seal Failure
What 2 valves should be used to calibrate a pressure sensor? - ✔✔Bleeding valve and block valce
How to create an XOR logic with relays? - ✔✔True table or logic gates
How to eliminate parallax error? - ✔✔Read measurements at eye level
Why choose grease over oil for a bearing? - ✔✔Greases are better for leakage control and provide better seals against contaminants
mtraontosdr (^) uwcerith chcoanil inge p - a ✔ral✔lelA (^) .)- ✔✔reactshaunncet
How detect metal objects verify - ✔✔Metal detectors work by generating an altering magnetic field that may interact with objects that are near this magnetic field
Transformers one side A matched to A other side to ground (all transformers one side to neutral=Y) (2 of
3 transformers to neutral = delta) - ✔✔B.) Y-Delta
Inputs feeds an operational amplifier, what calculation is used to control Va - ✔✔A.) Add
How many SCRs are needed minimum for a full wave reversing bridge rectifier? - ✔✔D.) 12 6 forward and 6 reverse
Bearing oil breakdowns cause - ✔✔B.) temperature
When tapping in cast iron - ✔✔C.) Coarse
Power supply question, fluctuating input of affects output of? - ✔✔A) Voltage B) Current
Stepper motor or synchronous motor define, older test - ✔✔synchronous is an AC motor that the rotation of the shaft is synchronized with the frequency ofthe supply current
Output is firing in the plc but no light is on - ✔✔check bulb first
PLC output card, circuit has no opens or shorts but them is not turning on - ✔✔replace output card
motor starter will not stay engaged - ✔✔a bad holding coil
tachometer on a servo motor reports back - ✔✔speed
What voltage is available on the secondary of a 480 V delta to 480 V Wye? - ✔✔A.) 480 Vpp / 230 Vp-n
Air cooler condenser vs water cooled condenser - ✔✔Air-cooled chillers have condensers that use ambient air to cool hot refrigerant.... water cooled condensers are typically tube in tube, tube in shell, or a plate type heat exchangers in which water from a cooling tower or other water source cools the refrigerant
Robotics "enable" a switch on the teach pendant allows what action - ✔✔it allows robot movement when it is continuously activated
Series circuits - ✔✔C.) resistance are accumulative
Parallel circuits - ✔✔B.) voltage remain constant
On an air reciprocating pump, if you shut fluid discharge, the pump will? - ✔✔D.) stall
Acid form in lubricants from - ✔✔A.) water vapor
Best way to identify control wires? - ✔✔Color is usually the best way to identify electrical wiring. all wiring looks the same on the inside, but the outside coverings come in different colors.
Bending offset multiplier for 30 degree bends? - ✔✔C.) 2
While using a saber saw to cut soft metal and blades fill with metal, what blade to switch to? - ✔✔A.) finer tteths
What determines the maximum safe speed when grinding? - ✔✔D.) diameter of grinding wheel
Rectifier converts - ✔✔A.) AC to DC
Digital drive circuit with DC power that gives no positional feedback? - ✔✔A.) servo motor
For a full wave SCR3 phase delta, what is the minimum of SCRs? - ✔✔B.) 6
2 inputs for OP-Amp produces? - ✔✔A.) addition
Counter > Encoder > Machine speed (signal rate) - ✔✔......
In a closed loop servo, a tachometer generates? - ✔✔Speed
What determines the regulation of a power supply? - ✔✔..
Low and high voltage motor wiring relating to delta and Y DRAWING NEEDED - ✔✔..
With a refrigerator with no power on, the contactor is open, holding the coil has power.. - ✔✔..
ARC welding a 1/4 butt joint use - ✔✔..
common - bus variable frequency drives share? - ✔✔..
Pulse width modulated signals produced? - ✔✔..
what voltage is available on the secondary of a 480 / to a 480y? - ✔✔..
