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WorksheetsELECS 6
Total questions: 50
Worksheet time: 25mins
________ is called an electronic transfer from one stage to the next.
Coupling
Swamping
Doping
Mixing
_______ capability is analogous to permeance.
Admittance
Conductance
Reluctance
Resistance
Which is a common use for point-contact diode?
As a constant current source
As a constant voltage source
As an RF detector
As a high voltage rectifier
Which of the following is not a secondary type cell?
Lithium
Lead-acid
Silver cadmium
Silver-zinc
What do you call the piece of equipment in an oscilloscope used to indicate pulse condition in a digital logic circuit?
Logic probe
Probe
Electroscope
Galvanometer
How many bits, binary pattern represent the decimal numbers 0 to 9 in binary coded decimal?
4
1
2
8
Which is the principal characteristic of a varactor diode?
It has a very high PIV
It has a negative resistance region
Its internal capacitance varies with the applied voltage
It has a constant voltage under conditions of varying current
What is the law whereby the attraction or repulsion between two magnetic poles is directly proportional to their strength?
Coulomb’s law
Newton’s law
Coulomb’s first law
Norton’s law
Efficient oscillators are those that are class ________.
AB
B
C
A
_______ refers to a circuit that stores pulses and produces an output pulse when specified number of pulses is stored.
Counter
Register
Flip-flop
Buffer
How many lithium cells in series are needed for a 12 V battery?
12 cells
4 cells
8 cells
10 cells
_________ is a linear electronic voltage regulator
A regulator that has a ramp voltage at its output
A regulator in which the control device is switched on or off, with the duty cycle proportional to the line or load conditions
A regulator in which the pass transistor switches from the “off” state to the “on” state
A regulator in which the conduction of a control element is varied in direct proportion to the voltage or load current.
The particles that make up the lattice in ionic crystal
Molecules
Ions
Electrons
Neutron
Parallel cells have the same voltage as one cell but have _______.
unstable resistance
less current capacity
fluctuating power output
more current capacity
A digital word consisting of only four bits is called a
dibit
quad
pixel
nibble
The reason for the thin layer of varnish over the copper coil pattern is to prevent
oxidizing
flux
corrosion
dioxide
_________ is the output voltage of a carbon-zinc cell.
3.5 V
2.5 V
1.5 V
0.5 V
Speed of a logic circuit is normally expressed as ________
logic levels
speed immunity
propagation delay
power consumption
_______ is the term used to express the ratio of the change in the dc collector current to a change in base current in a bipolar transistor.
Gamma
Beta
Alpha
Delta
_______ refers to a program that translates and then immediately executes statements in a high level language.
Interpreter
Synchronous
Interface
Operating system
__________ is the property of magnetic materials which retain magnetism after magnetizing force is withdrawn.
Reluctivity
Resistivity
Retentivity
Conductivity
A ________ is a junction field effect transistor with a Schottky barrier instead of a normal semiconductor junction.
biFET
MOSFET
MESFET
JUGFET
Term used for response in an electrical circuit.
The frequency at which power factor is at a minimum
The highest frequency that will pass current
The frequency at which capacitive reactance equals inductive reactance
The lowest frequency that will pass current
_________ is the progressive decay with time in the amplitude of the free oscillation in a circuit.
Decrement
Pulse decay time
Damping
Dancing
What do you call a circuit that changes pure binary code into ASCII?
Decoder
Encoder
Demultiplexer
Code converter
Which of the following statement is incorrect?
Open transistor has three (3) terminals
Transistors have three (3) terminals
Potentiometer has three (3) terminals
Typical power rating of carbon-composition resistors ranged from 0.001 W to 0.1 W
Which statement is not true?
The internal resistance of a cell limits the amount of output current
Two electrodes of the same metal provide the highest voltage output
Secondary cell can be recharged
The negative terminal of a chemical cell has a charge of excess electrons
What type of circuit whose parameters are constant which do not change with voltage of current?
Lumped circuit
Tuned circuit
Reactive circuit
Linear circuit
__________ is gaseous tube which uses a pool of liquid mercury as its cathode.
Thyratron
Phanotron
Klystron
Ignition
What do you call an electromagnet with its core in a form of magnetic ring?
Polarization
Irradiation
Toroid
Doping
_________ is the procedure by which an atom is given a net charge by adding or taking away of electron.
Polarization
Irradiation
Ionization
Doping
What do you call an electronic component that is a non-linear resistor and its resistance is function of the voltage across it?
Triac
IC
Varistor
Thyristor
Find the half-power bandwidth of a resonant circuit which has a resonant frequency of 1.8 MHz and a Q of 95.
189 Hz
1.89 kHz
58.7 kHz
18.9 kHz
A dynamic memory will store information
as long as power is applied to the memory
as long as power is applied and the memory is refreshed periodically
even when power is not applied to the memory
when power is applied at regular intervals
The energy of an oscillator can be source by _________
coupling a small coil close to the tube
capacitance of inductive coupling from tuned circuit
inserting resistor in the grid circuit
connecting capacitor across the supply
Refers to that part of computer that interprets and executes instructions
ACC
ALU
CPU
Compiler
What is the gain of a vacuum tube having the following parameter amplification factor is 80, external plate-load resistance of 30,000 ohms and the tubes internal plate resistance is 10,000 ohms?
60
20
30
40
__________is the region in a transistor that is heavily doped
Collector
Ground
Base
Emitter
Which class of amplifier has the highest linearity and least distortion
Class A
Class AB
Class C
Class B
_________ is the unit of reluctance.
Gauss
Weber
Maxwells
At/Wb
Find the value of voltage regulation having a dc voltage of 67 V without load and with full load current drawn the output voltage drops to 42 V.
59.5 %
15.9 %
62.6 %
32.5 %
What is the reason why more cells can be stored in a given area with dynamic cells?
They consume less power
They are smaller
They are larger
They travel faster
Which of the following is a characteristic of cascaded amplifier?
Double each amplifier’s gain
Each amplifiers gain is increased
Increased overall gain
Total gain is decreased
How do you determine if diode is defective?
Diode resistance is either very low or very high on either direction
High current
Very low current
High voltage
Avalanche breakdown is primarily dependent on the phenomenon of
doping
collision
recombination
ionization
What network facility is used to interconnect distinct networks physically?
Relays
Routers
Repeaters
Bridges
Diagram showing procedures which are followed and actions taken is called
functional block diagram
circuit diagram
flow chart
schematic diagram
Find the dielectric constant of air
Approximately 1
Approximately 0
Approximately 2
Approximately 4
__________ refers to the term remote sensing with regard to a linear voltage regulator.
The feedback connection to the error amplifier is made directly to the load
The load connection is made outside the feedback loop
The error amplifier compares the input voltage to the reference voltage
Sensing is accomplished by wireless inductive loops
Transition region refers to ________ with regard to transistor.
the area of maximum N-type charge
the area maximum P-type
the point where wire leads are connected to the P or N type material
an area of low charge density around P-N junction
