WorksheetsECT Pre-test
Total questions: 25
Worksheet time: 4mins
The volt is the standard unit of _______.
Electromotive Force
Electromagnetic Force
Current
Electrostatic
If a material has low resistance, then _______.
It is a good insulator
It is a good conductor
It is a semiconductor
It is a good material
Among dc motors, which produces the highest torque?
Series
Shunt
Compound
Differentially compounded
It is used to measure insulation resistance.
Insulation meter
Megger
VOM
Pyrometer
Which of the following is considered as best conductor of electricity?
Gold
Silver
Copper
Aluminum
A transformer core is laminated to _______ .
Reduce current loss
Reduce hysteresis loss
Reduce eddy current loss
All of the above
How is a voltmeter usually connected to a circuit under test?
In series
In quadrature
In phase
In parallel
What is the cgs unit of magnetic flux?
Maxwell
Weber
Oerested
Tesla
The results of internal IC failures will usually be noticed during the ______ phase of troubleshooting.
diagnostic
Isolation
Repair
Final Test
The rate at which work is performed is called
___________.
Current
Energy
Power
Voltage
What is the unit of current?
Volt
Ohm
Ampere
What is the color code for a 220 ohms 5% resistor?
Red, Red, Brown, Gold
Orange, Orange, Black, Gold
Red, Red, Black, Gold
Red, Red, Brown, Silver
Which resistive component is designed to be temperature sensitive?
Thermistor
Rheostat
Potentiometer
Photoconductive cell
Which electromagnetic device uses brushes and a commutator?
A speaker
A dc generator
A relay
A solenoid
A Hall effect sensor
exists only in theory
is a non contacting magnetic sensor
can operate only a few times before failure
produces very large voltages
What happens to total resistance in a circuit with parallel resistors if one of them opens?
It increases.
It halves.
It remains the same.
It decreases.
A parallel circuit differs from a series circuit in that a parallel circuit has
no path for current flow
fewer paths for current flow
one path for current flow
more than one path for current
A measure of the repeatability of a measurement of some quantity is
error
precision
accuracy
significant
If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:
Direct Flow
alternating
pulsating
repetitive
What voltage will an ac voltmeter display?
rms
average
peak
peak-to-peak
A damaged resistor
may appear burned
may have an increased resistance value
may be checked with an ohmmeter
All of the above
Under normal conditions a diode conducts current when it is
reverse-biased.
forward-biased.
avalanched.
saturated.
Ohm's law describes the mathematical relationship between
ohms, kilohms, and megohms
resistor size and resistor value
resistance, voltage, and current
none of the above
In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?
amplitude
frequency
pulse width
phase
With surface-mount technology (SMT), the devices should:
utilize transistor outline connections
mount directly
have parallel connecting pins
require holes and pad
