WorksheetsELECS 25
Total questions: 50
Worksheet time: 25mins
When a PN junction is forward biased, what happens to the depletion region?
The depletion region decreases.
The depletion region increases.
The depletion region disappears.
The depletion region remains the same.
When the reverse bias on a varactor is increased, what happens to the effective capacitance?
Capacitance increases.
Capacitance decreases.
Capacitance remains the same.
Temperature coefficient increases.
In a reverse biased PN-junction, which current carriers cause leakage current?
The majority carriers.
The minority carriers.
The majority and minority carriers.
Either the majority or minority carriers.
The action of a PN-junction during breakdown can be explained by what two theories?
Zener effect and avalanche effect.
Zener and flywheel effects.
Avalanche and flywheel effects
Zener and Miller effects.
Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?
Miller effect
Avalanche effect
Zener effect
Flywheel effect
The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?
32
42
52
62
lf the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?
340 V
120 V
240 V
220 V
The suppressor grid is added to a tetrode to reduce what undesirable characteristic of tetrode operation?
Primary emission
Secondary emission
Tertiary emission
Quaternary emission
What type of bias requires constant current flow through the cathode circuit of a triode?
Anode biasing
Fixed biasing
Cathode biasing
Self biasing
How are computers classified?
Technology
Data they handle
Purpose
All of the choices
Mechanical computers are considered to be of what type?
Analog
Digital
Special
General
In a general-purpose computer, the ability to perform a wide variety of operations is achieved at the expense of what capabilities?
Speed and accuracy
Speed and memory capacity
Speed and efficiency
Speed and versatility
All analog computers are what type of computers?
Special-purpose
Electromechanical
Mechanical
First generation
What are analog computers designed to measure?
Electrical quantities
Physical quantities
Natural quantities
Continuous electrical or physical conditions.
Early analog computers were what type of devices?
Mechanical or electromechanical
Solid state type
Vacuum type
Electrical
What are computers called that combine the functions of both analog and digital computers?
Versatile computers
Hybrid computers
Anadigi computers
Mainframe computers
What is the temperature range within which a disk will operate?
10 to 50 degrees Celsius
10 to 15 degrees Celsius
20 to 60 degrees Celsius
50 to 100 degrees Celsius
What is the most basic type of filter?
The capacitor filter
Inductor filter
LC filter
Mechanical filter
What is the range of values usually chosen for a choke?
From 20 to 100 H
From 1 to 20 H
From 1 to 10 H
From 10 to 20 H
What is the ripple frequency of a full-wave rectifier with an input frequency of 60 Hz?
120 Hz
240 Hz
60 Hz
360 Hz
A standard programming language of the U.S. defense department similar to Pascal.
Ada
BASlC
C + +
RPG
The electron tube replaces what component in an electron tube voltage regulator?
Variable inductor
Variable capacitor
Variable resistor
Transistor
Which of the following is referred to as organized data?
Source
Information
Input
Output
What is the common mode rejection ratio of an ideal differential amplifier?
Infinity
Unity
Less than unity
Zero
The type of feedback used to improve the fidelity of an amplifier and to increase its frequency response.
Fidelity feedback
Positive feedback
Unwanted feedback
Negative feedback
A negatively charge atom is sometimes called ______.
electron
cation
anion
ion
If the magnitude of the potential difference is generated by a single conductor passing through a magnetic field, which of the following statements is false?
The potential difference depends on the speed with which the conductor cuts the magnetic field.
The potential difference depends on the length of the conductor that cuts the magnetic field.
The potential difference depends on the magnetic field density that is present.
The potential difference depends on the diameter of the conductor that cuts the magnetic field.
What is the internal resistance of a 9 V battery that delivers 100 A when its terminals are shorted?
0.09 Ω
11 Ω
1.0 Ω
90 Ω
Which of the following statements is true?
An ideal current source cannot be in parallel with a short circuit.
An ideal voltage source can be in parallel with an open circuit.
An ideal current source can be in series with an open circuit.
An ideal voltage source cannot be in series with an ideal current source.
What is the average power dissipated by an electric heater with resistance of 50 Ω drawing a current of 20sin (30t) A?
0 kW
10 kW
14.14 kW
20 kW
What measurements are required to determine the phase angle of a single-phase circuit?
The power in watts consumed by the circuit.
The frequency, capacitance and inductance.
The power in watts, voltage and current
The resistance, current and voltage.
The conductance and inductive susceptance of a circuit have the same magnitude. What is the power factor of the circuit?
1
0.707
0.5
0.866
A circuit has a resonant frequency of 455 kHz and a bandwidth of 57.2 kHz. Find the Q of the circuit.
795
79.5
0.795
7.95
A semiconductor logic output which pulls neither to a high nor a low voltage state.
Logic 1
Floating state
Logic 0
Limbo
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
Doping process
ionization
Thermal energy
Radiant flux
Refers to a field surrounding electrons and protons at stationary period indicating a stored energy.
Magnetic field
Electron field
Electrostatic field
Electrodynamic Held
The time required to complete one cycle of a waveform.
Wavetime
Wavelength
Frequency
Period
Lines of flux that do not follow the intended path.
Flux loss
Leakage flux
lnductance leakage
Hysteresis loss
What consists of elements inseparably associated and formed on a single substrate?
Micro-circuit
Integrated circuit
Module
PCB
What determines whether a substance is an insulator or a conductor?
Number of protons
Number of photons
Number of valence electrons
Number of neutrons
What do you call the space between and around charged bodies?
Magnetic field
Electromagnetic field
Electromotive field
Electrostatic field
What electrical quantity is measured by a watt-hour meter?
Current
Energy
Voltage
Power
What do you call the process of converting chemical energy into electrical energy in a cell?
Electron flow
Polarization
Electrolysis
Electrochemical action
A transformer has 500 turns in the primary and 1500 in the secondary. Assuming no losses, if 45 V is applied to the primary what is the voltage developed in the secondary?
13.5 V
180 V
135 V
90 V
What do you call the maintenance of oscillation in a circuit in the intervals between pulses of excitation energy?
Auto-oscillation
Damping
Flywheel effect
Feedback
A 15 µC point charge is located on the y-axis at (0, 0.25). A second charge of 10 µC is located on the x-axis at (0.25, 0). lf the two charges are separated by air, what is the force between them?
0.0982 N
0.341 N
10.79 N
33.93 N
What is energy of motion called?
Potential energy
Kinematics
Pneumatics
Kinetic energy
A fully charged lead-acid battery will indicate a specific gravity reading between.
1.175 to 1.200
1.200 to 1.225
1.225 to 1.250
1.275 to 1.300
An effect about microwave oscillation that occurs in a small block of N-type gallium arsenide when a constant DC voltage above a critical value is applied to contact on opposite faces.
Gunn effect
Mossbauer effect
Edison effect
Miller effect
What is the most influential factor in the switching speed of saturated bipolar transistor?
Charge storage
hfe
Collector current
hie
