1
In a step-down 3-phase transformer with no terminal markings, what would indicate the low voltage winding outputs.
The diameter of the wires sticking out of the transformer
If you wanted to block the flow of current as shown in the circuit at the left and you only have rectifiers rated at 100 PIV, you would?
Series the 3 rectifiers
EIA, RS232C, ASCII, Serial, all describe?
Communication Interfaces
Proper alignments between shafts cab be checked with a
Straightedge and feeler gague
A DC motor is normally reversed by
Reversing the armature or field leads
What does a transducer do?
Provide feedback
What should you test before putting into a service a wet motor that has been dried out?
Insulation resistance
A voltage tester placed across points 1 and 9 in the illustration at left indicates full control voltage, this tells you that?
The overloads are good
DC generators as a prime source of DC power, are being replaced by
Rectifying Units
The time constant of a thermal device is the time required to bring the measurement to within what percent of the final reading?
63.2%
Where must you reverse connections when you change a cumulative compound DC motor to a differential compound DC motor?
Series field
The correct device for connecting a flexible rubber or neoprene multiple conductor cable to a switchbox entry hole is
A cable grip
Given the following computer program, what values would be printed?
10 A=2
20 B=3
30 C=4
40 X=A+B+C
50 Y=X+B+C
60 Print X,Y
70 STOP
9,16
Immediately after a bearing has been cleaned and inspected, it should be given a coating of
Light oil
With 480 volts primary voltage, what would be the primary current at full load for a secondary full load of 11.2 amps at 240 volts
5.6 amps
When a DC motor does not come up to speed, what is wrong?
Field is too strong or motor terminal voltage is too low
Because the manner in which a voltmeter is used, it must have
High resistance
Typical PLC programs are written in?
Ladder Logic
A usual source of injury using portable grinders is
failure to protect the wheel against damage and handling
A hickey is used for
Bending conduit
What will happen to a shunt motor if a shunt field coil opens while the motor is under light load?
It runs away
A pressure transducer can be used to measure
Weight
What is a "dumb" terminal?
A remote CRT and keyboard for a main computer
The noise in which best describes the sound in welding indicating the current is set properly and the arc is at the right length is?
Frying (as bacon cooking)
What is the maximum number of 90 degree bends which should be used in a run of conduit between points where the wire can be pulled?