Ramsey Test

Solenoid valve fails to open, check what?

Normally closed (power to open)

ARC welding a 1/4 butt joint use

..

Low and high voltage motor wiring relating to delta and Y DRAWING NEEDED

..

Pulse width modulated signals produced?

..

What determines the regulation of a power supply?

..

With a refrigerator with no power on, the contactor is open, holding the coil has power..

..

common - bus variable frequency drives share?

..

what voltage is available on the secondary of a 480 / to a 480y?

..

Counter > Encoder > Machine speed (signal rate)

......

Size wire for 100-amp switch?

2-gauge

A cubic foot of steel weighs 500lbs how many pounds does a steels plate weigh dimension 3ft x 6ft x 3in

27,000 lbs

Maximum total degrees of bends in conduit?

360

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

Bearing ultrasound reading should be taken at what frequency? (high frequency threshold of a human)

B.) 20kHz

What 2 valves should be used to calibrate a pressure sensor?

Bleeding valve and block valce

Compressor running too hot, due to what? or do what?

Build up internal moisture and condensation

How many SCRs are needed minimum for a full wave reversing bridge rectifier?

D.) 12 6 forward and 6 reverse

Speed of induction motor is affected by 2 factors, answer was combination of 2

D.) Voltage and frequency

What determines the maximum safe speed when grinding?

D.) diameter of grinding wheel

On an air reciprocating pump, if you shut fluid discharge, the pump will?

D.) stall

First thing to do after you Meg a motor is?

Disconnect power or test megohmeter

Air cooled condensers generally have?

Fan, ambient air

What is the usual cause of overheating in high speed, grease-lubricated antifriction bearing

Faulty mounting practices

Hydraulic valves are typically adjusted by

Flow control valve and adjustment the control

Why choose grease over oil for a bearing?

Greases are better for leakage control and provide better seals against contaminants

A pilot flame detector can be what?

If flame is actually lit

In a closed loop servo, a tachometer generates?

Speed

What does an I/P transducer covert?

The I/P transducer converts an electronic signal, typically from a control system, to pneumatic signal used to control a valve

When air is compressed its temperature and....?

The pressure and temperature of the air increases

What is viscosity?

The resistance of a liquid to flow

This device does not require an analog input module on a PLC?

Thermocouple

Why are heavy oils used

To reduce the friction from heat and wear

What determines the selection of gear reducer size

Torque and speed

The insert, or spider, used in flexible jaw couplings is meant to

Transmit torque and accept misalignment

How to create an XOR logic with relays?

True table or logic gates

motor starter will not stay engaged

a bad holding coil

Air cooled condensers offer...

an air cooled condenser (ACC) is a direct dry cooling system where steam is condensed inside air-cooled finned tubes

Output is firing in the plc but no light is on

check bulb first

A transducer is a device that converts?

chemical or physical information into an electrical signal or the reverse

Air line filters and lubricators should be installed at

closer where it is going to be used

what does air do when its compressed

heat up

Exclusive or logic circuit?

is a logical operation that is true

Robotics "enable" a switch on the teach pendant allows what action

it allows robot movement when it is continuously activated

Measuring the inside of a pipe choose a device

micrometer

What color is a torch flame when gas only is on?

orange, yellow

pressure switch pictogram

pressure (half circle)

PLC output card, circuit has no opens or shorts but them is not turning on

replace output card

Which machine condition can be determined by using oil analysis?

Various types of wear and take corrective action before fails

motor with coil in parallel

shunt

tachometer on a servo motor reports back

speed

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

What is a Megger

the instrument used for measuring the resistance of the insulation

Rectifier converts

A.) AC to DC

What can you use to meet peak hydraulic system demands

A variable displacement pump

Variable frequency drives? And controllers

A variable frequency drive control the speed of AC motor by varying the frequency

Power supply question, fluctuating input of ______ affects output of ____?

A) Voltage B) Current

What voltage is available on the secondary of a 480V delta to 480V Wye?

A.) 480 Vpp / 230Vp-n

Inputs feeds an operational amplifier, what calculation is used to control Va

A.) Add

2 inputs for OP-Amp produces?

A.) addition

While using a saber saw to cut soft metal and blades fill with metal, what blade to switch to?

A.) finer tteths

transducer change

A.) reactance

Digital drive circuit with DC power that gives no positional feedback?

A.) servo motor

Acid form in lubricants from

A.) water vapor

Safe operating speed of an air motor is controlled by the

Air supply pressure

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

Bending offset multiplier for 30 degree bends?

C.) 2

When tapping in cast iron

C.) Coarse

How detect metal objects

C.) inductance

Series circuits

C.) resistance are accumulative

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.

Final element in a control loop is the?

Control valve

Control systems have what four basic components?

Controller, Amplifier, Actuator, and feedback

Main purpose of a rectifier is to?

Convert AC to DC

The speed of a piston is determined by

Crankshaft stoke and the engine RPM

Hydraulic reservoir suction lines can be raised for what

Create enough vacuum

Clutches on machinery provide for disengaging and may also

Interrupt the power supply

What is the pressure on a fluid

Measurement of force per unit area on an object in the fluid

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

why do metal parts seize when there is a lack of lubrication

Metal to metal contact. (lube protects the bearing against corrosion)

Pressure in the hydraulic system can be controlled electrically by the use of

Metering the flow of fluid into or out

Regulation of a power supply refers to the ?

Output

Shutting fluid discharge of an air operated reciprocating pump will cause the pump to

Overstroke

Acids that form in lubricants affect performance are a result of

Oxygen from the air and high temperatures

How to put a bearing onto a shaft

Press fit

How to control pressure in a hydraulic system

Pressure control is achieved in hydraulic systems by metering the flow of a fluid into or out of a constrained volume

How can too much wear in gears be reduced

Proper meshed

Centrifugal pumps, cavitation can result in?

Pump performance deterioration, mechanical damage, noise and vibration

How to eliminate parallax error?

Read measurements at eye level

Regenerative solid state drive prevents

Regenerative drives take electrical energy generated by a motor and feed it back to the AC power source or to a common bus

Tool used to measure threads?

Screw gauge- thread gauge- pitch gauge

Excess oil on a cylinder rod because?

Seal Failure

Why are timing belts made with teeth

Doesn't slip

What causes lubrication oil to get milky

Mixing incompatible oils, contamination

For a full wave SCR3 phase delta, what is the minimum of SCRs?

B.) 6

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

How to reduce gear wear

B.) selecting the right pitch

Bearing oil breakdowns cause

B.) temperature

Parallel circuits

B.) voltage remain constant