ILT 115 Final Test Questions and Answers 100% Correct
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Course
ILT 115
Institution
ILT 115
ILT 115 Final Test Questions and Answers 100% Correct
Which of the following soft start acceleration modes of operation regulates the maximum staring current to some preset value - Answer- Current limit start
The reversal of a DC motor is accomplished by - Answer- Reversing the direction of ...
ILT 115 Final Test Questions and
Answers 100% Correct
Which of the following soft start acceleration modes of operation regulates the
maximum staring current to some preset value - Answer- Current limit start
The reversal of a DC motor is accomplished by - Answer- Reversing the direction of the
armature current only and reversing the direction of the field currently only
Which of the following braking systems applies to stopping a motor by reversing it while
it is still running in the forward direction - Answer- Plugging
Which of the following braking systems can hold a motor stationary once it has stopped
- Answer- Friction brake
DC injection braking is a method of braking in which - Answer- DC is applied to the
stator windings of an AC motor
The speed of an induction motor depends on the - Answer- Number of poles built into
the motor and frequency of the power supplied to it
When voltage is applied across a diode in such a way that the diode allows current to
flow, the diode is said to be - Answer- Forward biased
An ohmmeter rest of a diode shows a high resistance reading in both directions. This is
an indication that the diode is - Answer- Faulted open
The purpose of a power supply filter is to - Answer- Smooth out the DC voltage from the
diode rectifier citcuit
The DC output voltage of a diode rectifier circuit can be smoothed out by means of a -
Answer- Capacitor connected in parallel with the output
A zener diode - Answer- Allows current to flow in the forward direction, allows current to
flow in the reverse direction when the voltage is above a certain value, and is typically
used to regulate voltage in electric circuits
A light emitting diode (LED) will - Answer- Conduct a current in one direction only, give
off light when current flows through it, and consume less energy than a filament type
light bulb
, Pushbutton interlocking or reversing motor starters utilizes - Answer- A mechanical link
between the forward and reverse pishbuttons
The three leads of a bipolar transistor are the - Answer- Base, collector, and emitter
The PNP transistor is the complement of the NPN transistor. This means that - Answer-
The two are electrically similar except that opposite current and voltages are involved
A darlington transistor combines _____________ Into a single device - Answer- Two
transistors
Compared to a bipolar transistor the field effect transistor (FET) - Answer- Has a lower
switching speed
Which of the following field effect transistors is "normally off" in that if a voltage is
connected to the drain and source and no voltage is connected to the gate, there will be
no current flow through the device - Answer- Enhancement mode MOSFET
Compared to mechanical switching circuits, transistor switching circuits - Answer-
Require less driving power to operate, have no loving parts to wear out, and can be
operated on and off at a higher rate of speed
How is a silicon controlled rectifier similar to a diode recrifier - Answer- Both conduct
current in one direction only
When an SCR is operated from an AC source - Answer- The gate can be used to switch
the current on and off at all times and the output is always direct current
SCRs usually fail shorter as indicated by an ohmmeter resistance reading from anode-
to-cathode that is - Answer- Near zero in both directions
Current flow between the main terminals of a TRIAC is - Answer- In either direction
A DIAC is designed to conduct current in - Answer- Either direction when it's rated
voltage is exceeded
An integrated circuit is a - Answer- Miniaturized electronic circuit fabricated into a single
silicon chip
Appropriate attire for a job site could include - Answer- A hard hat, safety shoes, and
safety goggles
Generally, any voltage above __________ volts is considered dangerous - Answer- 30
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