NEW
Font size
WorksheetsELECS 19
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 capacitors?
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
Zener effect
Avalanche effect
Flywheel effect
In SCR, the anode current is made up of
Electrons
Holes
Electrons and holes
Positive ions
What is the most popular oscillator configuration for audio application?
Wien bridge oscillator
Hartley oscillator
Colpitt’s oscillator
Tuned oscillator
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
Cathode biasing
Fixed biasing
Self biasing
How are computers classified?
Technology
Purpose
Data they handle
All of the choices
Mechanical computers are considered to be of what type?
Analog
Special
Digital
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
Mechanical
Electromechanical
First generation
What are analog computers deigned to measure?
Electrical quantities
Physical quantities
Natural quantities
Continuous electrical or physical conditions
Early analog computers were what type of devices?
Mechanical or electromechanical
Sold 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
Which on is the first generation of IC op-amps?
Fair child 709
Texas instrument 709
Motorola 709
National semiconductor 709
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
60 Hz
240 Hz
360 Hz
A standard programming language of the U.S. defence department similar to Pascal.
Ada
C++
BASIC
RPG
The electron tube replaces what component in an electron tube voltage regulator?
ariable inductor
Variable resistor
Variable capacitor
Transistor
Which of the following is referred to as organized data?
Source
Input
Information
Output
What is the common mode rejection ratio of an ideal differential amplifier?
Infinity
Less than unity
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
Anion
Cation
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
LEDs normally work on a voltage from
1 to 2 V
10 to 20 V
2 to 5 V
3 to 6 V
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
14.14 kW
10 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
0.5
0.707
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
0.795
79.5
7.95
A semiconductor logic output which pulls neither to a high nor a low voltage state.
Logic 1
Logic 0
Floating state
Limbo
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
Doping process
Thermal energy
Ionization
Radiant flux
Refers to a field surrounding electrons and protons at stationary period indicating a stored energy.
Magnetic field
Electron field
Electrostatic field
Electrodynamic field
The time required to complete one cycle of a waveform.
Wavetime
Frequency
Wavelength
Period
Lines of flux that do not follow the intended path
Flux loss
Inductance leakage
Leakage flux
Hysteresis loss
What consist of elements inseparably associated and formed on a single substrate?
Micro-circuit
Module
Integrated circuit
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
Voltage
Energy
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
135 V
180 V
90 V
What do you call the maintenance of oscillation in a circuit in the intervals between pulses of excitation energy?
Auto-oscillation
Flywheel effect
Damping
Feedback
Which one of the following can be used to generate a pulse whenever triggered?
Flip flop
Monostable multivibrator
Stable multivibrator
Schmitt trigger
What is energy of motion called?
Potential energy
Pneumatics
Kinematics
Kinetic energy
A fully charged lead-acid battery will indicate a specific gravity reading between ___.
1.175 to 1.200
1.225 to 1.250
1.200 to 1.225
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
Edison effect
Mossbauer effect
Miller effect
What is the most influential factor in the switching speed of saturated bipolar transistor?
Charge storage
hte
Collector current
hie
