ELEC
Why is an exclusive-NOR gate also called an equality gate?
The output is true if the inputs are equal.
The purpose of the commutator in a generator or motor is to
change the direction of the current to the rotor as it spins
a photodiode, light produces ___________.
reverse current
In a class A amplifier, the output signal is _____.
the same shape as the input
A network designed to pass signals with frequencies between two specified cut-off frequencies is called a ____ filter.
band-pass
With surface-mount technology (SMT), the devices should:
mount directly
A TTL totem-pole circuit is designed so that the output transistors:
are never on together
Which of the following is not a basic Boolean operation?
AND
The electron activation of a movable shaft is the basis for:
Solenoids
When the frequency of the source voltage is increased, the impedance of a parallel RC circuit ____.
decreases
In a motor, back emf serves to
decrease the current in the armature
An advantage of an auto-transformer is that:
Copper loss is reduced
The output voltage of balanced Wheatstone bridge is:
Equal to zero
Pentavalent impurities:
increase a condition of a semiconductor material
The systematic reduction of logic circuits is accomplished by:
using Boolean algebra
The resonant frequency of parallel circuit is the same as a series circuit using the same components when:
The Q is very high
What is the advantage of using CMOS logic over TTL?
It uses less power.
If you have an RC and an RL differentiator with equal time constants sitting side-by-side and you apply the same input pulse to both,
you cant tell the difference by observing the output waveforms
When one of four series resistors is removed from a circuit and the circuit reconnected, the current
increases
What is probably happening when an ohmmeter, connected across an unpowered circuit, initially indicates a low resistance and then shows increasing resistance with time?
The circuit contains a large capacitor.
Which of the following statements is false?
A transformer whose secondary current is greater than the primary current is a step-up
Which of the following statements is true?
Galvanizing iron helps to prevent corrosion
Reluctance in magnetic circuit is analogous to ____ in an electric circuit
resistance
Atoms within a semiconductor crystal are held together by:
Covalent bonds
Using the polar coordinate system, what visual representation would you get of a voltage in a sinewave circuit?
The plot shows the magnitude and phase angle