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WorksheetsELECS 23
Total questions: 50
Worksheet time: 25mins
What is the science of interaction or interconversion of electrical and acoustic phenomena?
Electrodynamics
Electrography
Electroanalysis
Electroacoustics
What do you call the graphic record or the curve traced by the electrical activity of the brain as recorded by the electroencephalograph?
Electroform
Electrograph
Electrocardiogram
Electroencephalogram
What imaging technique produces clear view of flowing blood or its blockage in narrow vessels?
Blood collation
Chemotography
Blood chemistry
Digital subtraction anglography
What tube in a duplexer has the primary function of disconnecting the receiver?
Klystron tube
Magnetron tube
Thyratron tube
TR tube
What requirement for a vacuum tube that does not exist for semiconductor?
Filament or heater voltage
Envelope
Grid
Screen
An internal component of a klystron oscillator which modulates the velocity of the electrons.
the pair of buncher grids
The pair o f plates
The pair of catcher grids
The collector plate
Given a power supply with a no load voltage of 12 volts and a full load voltage of 10 volts, what is the percentage of voltage regulation?
17%
20%
80%
83%
A 50-µA meter movement has an internal resistance of 2 kΩ. What applied voltage is required to indicate half-scale deflection?
0.01 volt
0.10 volt
0.005 volt
0.05 volt
The expression “voltage regulation” as it applies to a shunt-wound DC generator operating at a constant frequency refers to
Voltage output efficiency
Voltage in the secondary compared to the primary
Voltage fluctuations from load to no-load
Rotor winding voltage
The expression “voltage regulation” as it applies to a generator operating at a constant frequency refers to
Full load to no load
Limited load to peak load
Source input supply frequency
Field frequency
When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units?
6 hours
3 hours
1.8 hours
1.2 hours
What is the total voltage when 12 nickel-cadmium batteries are connected in series?
12 volts
12.6 volts
15 volts
72 volts
The turn ratio of a transformer is 1:20. When a 120 volt ac source is connected to its primary winding, the secondary voltage is
120 volts
1200 volts
600 volts
2400 volts
A power transformer has a single primary winding and three secondary windings producing 5.0 volts, 12.6 volts, and 150 volts. Which of the three secondary windings will have the highest measured DC resistance
The 12.6 volt winding
The 5.0 volt winding
The 150 volt winding
All will have equal resistance values
A special type of power supply filter choke inductance is inversely proportional to the amount of current flowing through it is a
AF choke
RF choke
Smoothing choke
Swinging choke
What is the most suitable oscillator circuit for generating 1kHz?
Hartley oscillator
Colpitt’s oscillator
Wien bridge oscillator
Tuned collector oscillator
How many the range of a thermocouple ammeter be increased?
By using a current transformer
By using a capacitor shunt
By using a current transformer and a capacitor shunt
By using a resistor shunt
By what factor must the voltage of an ac circuit, as indicated on the scale of an ac voltmeter, be multiplied to obtain the average voltage value?
0.707
0.9
1.414
3.14
What special type of diode is capable of both amplification and oscillation?
Point contact diodes
Zener diodes
Tunnel diodes
Junction diodes
What is a common use of hot-carrier diode?
As balanced inputs SSB
As a variable capacitance in a automatic frequency control circuit
As a constant voltage reference in a power supply
As VHF and UHF mixers and detectors
What is the normal operating voltage and current for a light-emitting diode?
60 volts and 20 mA
5 volts and 50 mA
1.7 volts and 20 mA
0.7 volts and 60 mA
What type of bias is required for an LED to produce luminescence?
Reverse bias
Forward bias
Zero bias
Inductive bias
What is the name of the semi-conductor IC that has a fixed pattern of digital data stored in its memory matrix?
RAM—Random-Access Memory
ROM—Read-Only Memory
Register
Latch
What would be the bandwidth of a good crystal lattice band-pass filter for a double-sideband phone emission?
1 kHz at -6 dB
500 Hz at -6 dB
6 kHz at -6 dB
15 kHz at -6 dB
What technique can be used to construct low cost, high performance crystal lattice filters?
Splitting and tumbling
Tumbling and grinding
Etching and splitting
Etching and grinding
What term defines a series of overshoots in a servo system?
Positioning
Variation
Hunting
Oscillating
What is the acceptable ratio of back-to-forward resistance for a diode?
2 to 1.5
Greater than 10 to 1
Less than 10 to 1
3 to 2
Packaging is required for what reason in IC production?
To meet storage requirement
To increase shelf-life
To dissipate heat
Ease of handling and protection from damage
In radioactivity, what is the unit to measure the biological damage caused by radiation?
rem
rad
lumen
reb
What do you call the fine wires connecting the bonding pad to the chip t the external lead of the package?
Harness
Cables
Bonding wires
Leads
What do you call the ratio between the intensity of magnetization produced in a substance, to the source of magnetizing force?
Magnetic resistivity
Magnetic conductivity
Magnetic susceptibility
Magnetic reluctivity
What is a semi-conductor chip with electrodes (leads) extended beyond the wafer?
DICE
Flip chip
Beam-lead chip
DIP
What do you call an assembly of microcircuits or a combination of microcircuits and discrete components packaged as replacement?
Electronic module
Microcircuit module
PCB
Minielectronics
In the operation of dry cells, we normally refer to the supply of current to load resistance where its current neutralizes the separated charges at the electrodes as ________>.
aligning the cells
charging the cells
discharging the cells
polarizing the cells
What are the special class C amplifiers that are biased at 3 to 10 times the normal cutoff and used to generate frequency that is a harmonic of a lower frequency?
Frequency generators
Frequency stabilizers
Frequency multipliers
Frequency amplifiers
Which of the following capacitors costs more per µF of capacitance?
Plastic
Mica
Paper
Electrolytic
What capacitors are suitable for dc filter circuits?
Mica
Electrolytic
Ceramic
Plastic
What is the other name or relative permittivity?
Dielectric strength
Breakdown voltage
Specific inductive capacity
Potential gradient
In RF amplifier with optimum coupling, what method provides the widest bandpass?
A parallel circuit
A swamping resistor
A parallel variable resistor
A dc coupling capacitor
What is the operating condition of a circuit when no input signal is being applied to the circuit?
Neutral
Quantum
Quiescence
No load condition
What is the reading of a fully charged lead-acid battery?
1.025 – 1.075
1.200 – 1.500
1.050 – 1.350
1.280 – 1.300
Which of the following are the basic elements in a 555 timer IC?
a) Two comparators
b) A flip-flop
c) A discharge transistor
d) A resistive voltage divider
A, B and D only
A, B and C only
B, C and D only
A, B, C and D
In a sawtooth generator, increasing gate does what to linearity?
Nothing
Increases linearity
Blocks linearity
Decreases linearity
Why are digital multimeters well suited for testing sensitive devices?
High current flow
It is portable and ruggedized
Because of its sensitivity
Current flows through the component is limited to 1 mA
Compensation to an op-amp means ________ bandwidth and _________ slew rate.
reduced, increased
reduced, reduced
increased, reduced
increased, increased
Boolean algebra is based on the assumption that most quantities have ______ possible states.
four
two
three
single
Which of the following are types of resonant LC oscillators?
A. Colpitts
B. Clapp
C. Hartley
D. Armstrong
E. Crystal-controlled
A, B, C and E only
A, B, C and D only
B, C, D and E only
A, B, C, D and E
What does the base or radix of a number system tell you about the system?
Number of units used in the system
Number of items used in the system
Number of symbols used in the system
Number of numerals used in the system
The specific gravity of a lead-acid battery is a measure of its ______
battery life
operating temperature
state of charge
rate of discharge
In active filter, what type of filter passes a range of frequency and a certain higher frequency?
Band-stop
High pass
Low pass
Band-pass
