Receiving job instruction and planning
equipment use are part of:
a. craft data.
b. job preparation.
c. work factors.
d. leveled time.
b. job
... [Show More] preparation
Anticipating other tasks or problems:
a. usually creates additional problems.
b. wastes time.
c. sharply reduces the number
of emergencies.
d. often is not worth the effort.
c sharply reduces the number
of emergencies
Making job planning a group effort:
a. wastes time.
b. improves productivity.
c. causes confusion.
d. All the above
b improves productivity
Rubber safety gloves should be tested how often?
a Every 12 months
b. Every 9 months
c. Every 6 months
d. Every 4 months
a Every 12 months
Rubber safety blankets should be tested how often?
a. Every 6 months
b. Every 9 months
c. Every 12 months
d. Every 18 months
b Every 9 months
What is the interrupting current of a GFIC receptacle?
a. 20 VAL
b. 5 MA
c. 10 UDL
d. 20 MA
b 5 MA
What type of stepladder is forbidden while working on electrical equipment?
a. Wood
b. Fiberglass
c. Aluminum
d. Ceramic
c Aluminum
What is the killer of electrical shock?
a. Voltage
b. Current
c. Resistance
d. Ohms
b Current
The relationship between an electric
current and a magnetic field is called:
a. matter.
b. atoms.
c. electromagnetism.
d. element
c electromagnetism
Electrons flowing from one place to
another make a:
a. current.
b. track.
c. circuit.
d. channel
a current
Between two objects, the development
of static charges creates a:
a. potential difference.
b. battery.
c. thermocouple.
d. resistance
a potential difference
A coil of wire that carries an electric
current is called a:
a. conductor.
b. thermocouple.
c. electrocurrent.
d. electromagnet
d electromagnet
Metals are good conductors because
they have many:
a. insulators.
b. free electrons.
c. resistors.
d. inductors.
b free electrons
The amount of potential difference a layer of
insulation can withstand without breaking down is:
a. resistance.
b. voltage drop.
c. dielectric strength.
d. ampacity
c dielectric strength
What is the property of a coil of wire that opposes any change in the current in the coil?
a. Inductance
b. Resistance
c. Impedance
d. Watts
a Inductance
What is the correct name for "voltage" or electromotive force?
a. Element
b. Electron
c. Circuit
d. Potential difference
d Potential difference
A rate of flow of one coulomb per second
is called one:
a. ampere.
b. joule.
c. volt.
d. olhum.
a ampere
What is the name for the proportional relationship
between potential difference and current?
a. Voltage drop
b. Voltmeter
c. Ampmeter
d. Watt meter
b Voltmeter
What is the unit of measurement for capacitive
reactance?
a. Volts
b. Ohms
c. Amps
d. Power factor
b Ohms
Power companies use AC generators because AC can be sent over long distances:
a. at high cost.
b. at low cost.
c. slower.
d. faster.
b at low cost
What device changes alternating current to a
different combination of voltage and current?
a. Generator
b. Capacitor
c. Alternator
d. Transformer
d Transformer
How does the power going into a transformer
compare to the power coming out?
a. Lower
b. Equal
c. Double
d. Higher
b Equal
What changes continuously around the conductor
when current changes continuousl in AC circuits?
a. Voltage
b. Current
c. Magnetic field
d. Amps
c Magnetic field
Wires and cables can be classified according
to their:
a. color.
b. size.
c. covering.
d. shape.
c covering.
What kind of starter provides full-voltage starting?
a. Across-the-line
b. Synchronous start
c. Reactor starter
d. Reduced-voltage start
a Across-the-line
The choice between across-the-line starting
and reduced-voltage starting depends in part
on the size of the: a. starter.
b. wire size.
c. motor.
d. breaker.
c motor.
The most important requirement for good
maintenance of motor starters is:
a. good record keeping.
b. safety of personnel.
c. proper lubrication.
d. clean, dry insulation
c proper lubrication
A reversing starter reverses a three-phase
motor by interchanging:
a. main contacts.
b. two of the line leads.
c. all of the line leads.
d. control voltage.
b two of the line leads
What kind of protection is provided in a manual across-the-line three-phase motor control?
a. Overload protection only
b. Ground-fault protection only
c. Short-circuit protection only
d. All of the above
a Overload protection only
Commonly used instead of fuses in industrial
power distribution systems are:
a. disconnects.
b. motor starters.
c. overcurrent relays.
d. circuit breakers.
d circuit breakers.
Distribution protection usually consists of two
elements, protection of both:
a. equipment and circuit.
b. personnel and equipment.
c. wire and control relay.
d. ground fault and current.
a equipment and circuit
What is the current in amperes of a 120-volt
circuit with a resistance of 60 ohms, using
Ohm's Law?
a. 0.5 amperes
b. 2.0 amperes
c. 30 amperes
d. 10 amperes
b 2.0 amperes
Solving for I:
I = ER Substituting values into the equation:
I = 120 volts/60 Ohms = 2 amperes
What is the current for a 120-volt circuit with
a 1440-watt load?
a. 0.083 amperes
b. 10 amperes
c. 12 amperes
d. 15 amperes
c 12 amperes
Since P = EI, current can be determined as I = P/E
Substituting values into the equation:
I = 1440 watts /120 volts = 12 amperes
What is the current of a circuit that consumes
625 watts through a 12.75-ohm resistor?
a. 3.8 amperes
b. 7 amperes
c. 49 amperes
d. 175 amperes
b 7 amperes
E = IR and P = EI
Substituting the first equation into the second:
P = (IR)I
P = I Squared x R Solving for I:
I Squared = P / R
I = SqRt P/R
I = SqRt 625/12.75
I = SqRt 49
I = 7 amps
What is the ampere load of a single-phase 1/2 horsepower 115-volt motor, if the motor has
an efficiency rating 92% and power factor of 80%?
a. 9.5 amperes
b. 2.4 amperes
c. 4.4 amperes
d. 78.1 amperes
c 4.4 amperes
Use the formula I = 746 x horsepower / voltage x efficiency x power factor, where I is the current.
I = 746 x 0.5 / 115 x 0.92 x 0.80 = 4.4 amperes
A 230-volt single-phase circuit has a 12-kilowatt
power load and operates at 84% power factor. What is the current?
a. 43 amperes
b. 52 amperes
c. 62 amperes
d. 70 amperes
c 62 amperes
the formula
I = kilowatts x 1.000 / voltage x power factor
where I is the current.
I = 12 x 1.000 / 230 x 0.84 = 62 amperes
The difference between the measurement signal
and the set point is called the:
a. gap.
b. error.
c. feedback.
d. span.
b error
The signal pressure is usually directly proportional
to the process:
a. span.
b. level.
c. variable.
d. loop.
c variable
Offset is the difference between the actual maintained value of the measured variable and:
a. the set-point.
b. the span.
c. zero.
d. the level.
a the set-point
Another name for built-in error that usually
occurs in a proportional control system is:
a. deadband.
b. offset.
c. set point.
d. span.
b offset
An automatic controller always compares a
measured variable to:
a. zero.
b. span.
c. reset.
d. set point.
d set point.
The specific value at which an automatic control
holds a process variable is called the:
a. span.
b. variable.
c. control point.
d. set point.
c control point
The drawing that provides a view of the entire
system in process control is the:
a. P&ID drawing.
b. I/P drawing.
c. element drawing.
d. primary drawing.
a P&ID drawing
A tag number with a code reading FRC identifies
a. field recording controller.
b. flow recorder controller.
c. temperature controller.
d. pressure recorder.
b flow recorder controller
The most commonly used type of diagram in
process control is:
a. a loop diagram.
b. an installation drawing.
c. a piping and instrument drawing.
d. a location drawing.
c a piping and instrument drawing
A signal from a measuring device to the controller
is called:
a. zero.
b. correcting.
c. span.
d. feedback.
d feedback.
In a closed loop control system, the control
process of measuring, comparing, computing
and connecting goes on:
a. continually.
b. intermittently.
c. never.
d. whenever the operator takes some action.
a continually
A control system in which the output is regulated
only by changes from outside the process is called:
a. open loop.
b. closed loop.
c. set point.
d. measuring.
a open loop.
A common converter used in process control
is the I/P converter, which converts ________
signals to ________ signals.
a. zero, span
b. analog, digital
c. current, pneumatic
d. linear, nonlinear
c current, pneumatic [Show Less]