WorksheetsELECS 8
Total questions: 50
Worksheet time: 25mins
Find the Thevenins impedance equivalent across R2 of a linear close circuit having 10 volt supply in series with two resistors (R1 = 50 ohms and R2 = 200 ohms).
400 ohms
40 ohms
4 ohms
4 k-ohms
What is the process of converting multiple analog input signals sequentially to digital output?
Time division multiplexing
Analog to digital conversion
Space division multiplexing
Pulse code multiplexing
What is the equivalent of decimal 15 in octal?
15
18
17
16
________ is the transistor which fabricated as two complementary SCRs in parallel with common gate terminal.
Triac
Field effect transistor
Bilateral SCR
Unijunction transistor
How many diodes will you use to have a basic half-wave rectifier?
3
4
2
1
Electric charge of neutron is the same as
proton
electron
current
atom
The current of an electric circuit is analogous to _________ parameter of a magnetic circuit.
A. flux density
flux density
reluctivity
mmf
flux
Find the filter capacitor that will provide 2.5% ripple filtered voltage having a load of 120 mA, full wave rectified voltage of 36 V dc and 60 Hz supply.
3117 microfarads
3207 microfarads
311.7 microfarads
320.7 microfarads
Which of the following solid state devices work on the phenomenon avalanche breakdown?
Triac
Unijunction
All of these
Light activated SCR
_______ is unipolar semiconductor device which the current is carried by the majority carriers only.
Field-effect transistor
Point-contact transistor
Zener diode
Junction transistor
_________ is a gate which has 2 or more low input signals to get low output.
AND
Inverter
OR
NAND
The main reason for the variation of amplifier gain with frequency is
due to inter-stage transformer
the presence of capacitance both external and internal
the logarithmic increases in its output
the Miller effect
Component of solar battery which uses light energy to produce electromagnetic force
Alkaline cells
Polymer cells
Lithium cells
Selenium cells
What is the term called magnetic field?
The force between the plates of a charged capacitor
A force set up when current flows through a conductor
Current flow through space around a permanent magnet
The force that drives current through a resistor
Find the voltage drop developed across D’Arsonval meter movement having an internal resistance of 1 k-ohm and full deflection current of 150 micro amp.
150 kV
150 mV
150 V
150 micro V
Kind of AC-motor, light load high speed or high load low speed
Synchronous motor
Squirrel cage motor
Split phase motor
Universal motor
One of the following can program bipolar PROMs.
Biasing bipolar transistor
Blowing fuse
Enfusing input
Charging a gate
In order to maintain same secondary output voltage, a power supply which operate from either 120 V or 240 V ac lines must have primary winding:
split exactly 1/3 from one end
split exactly 1/4 from one end
completely no split
split exactly 1/2 from one end
What is the counter that follows the binary sequence?
Binary counter
Simplex counter
Shift counter
Decimal counter
_______ are non-semiconductor devices still used in digital memories.
Gates
Flip-flops
Relay
Magnetic cores
What is the reference cycle time use in radar, when the signal is transmitted and back to receiver?
10.1 microsec
100.0 microsec
12.4 microsec
24.8 microsec
Process in industrial electronics where electrons are emitted from the surface of certain metals when expose to the light is called
photonics
photosensitive
phoovoltaic
photoemission
A FET can act as an excellent buffer amplifier because
it has a low input impedance and high output impedance
it has a very high voltage gain and low noise level
it has a high input impedance and low output impedance
smaller size, longer life and lower efficiency
Eddy Currents
What is the smallest element of a matter?
Neutron
Proton
Atom
Electron
Refers to a pulse transmitter-receiver used in radio navigation and secondary surveillance radar to either a reply from transponder is called
ILS
Interrogator
Outer maker
Inner maker
A triac behaves like two
diodes in series
resistors and one diode
four-layer diodes in parallel
inverse parallel connected SCRs with common gate
________is called the flux density produced within, due to its own induced magnetism.
Electromagnetic field intensity
Magnetic field intensity
Intensity of magnetization
Electric field intensity
The resonant circuit of a tuned-collector transistor oscillator has a resonant frequency of 5 MHz. If the value of capacitance is increased by 50%, calculate the new resonant frequency.
3.33 MHz
11.25 MHz
2.6 MHz
4.08 MHz
The ability of a material to conduct magnetic flux through it refers to
permittivity
permeability
reluctivity
conductivity
___________ is one factor that does not affect resistance.
Cross sectional area
Resistivity
Mass
Length
Type of power line frequency meter device utilizing a principle of balancing an indicator needle at center at a scale using magnetic fields (resistive and inductive) opposing each other
Magnetic type
Resonant type
Resistive type
Electrodynamic type
A measuring device or a meter made, so the pointer rests at the center of its scale zero current.
Linear meter
Galvanometer
Digital meter
Non-linear meter
Part of the oscilloscope which produces bright spot through collection of electrons
Focus control
Heater cathode
Aquadag coating
Grid
For a processor that uses 4-bit words, the largest number that can be represented using double precision is
255
15 (decimal)
65,535
127
__________ refers to the class of logic circuit containing flip-flops.
Combinational
Sequential
Linear
Feedback
How does junction diodes rated?
Maximum reverse current and PIV
Maximum forward current and PIV
Maximum forward current and capacitance
Maximum reverse current and capacitance
What logic circuit is analogous to a single pole mechanical selector switch?
Decoder
Encoder
Multiplexer
Exclusive OR
What do you call an electronic measuring equipment used in navigation which provides runway direction, distance and height guidance to permit blind landing?
DME
ODR
TACAN
ILS
An encoder is an MSI (medium-scale-integration) circuit that
provides an output code that corresponds to which a set of input line is true
provides a storage of a certain number of binary bits
selects a given output based on binary input code
provides for delivering one of two or more inputs to an output
In a high-fidelity system, the pair of filter which separate audio frequency band signals into two separate groups, one of which is fed to the tweeter and the other to the woofer is called
matching transformer
crossover network
equalizer
bridge network
How long in nautical miles does the radar travel to and from at 12.4 microseconds?
2 miles
1 miles
3 miles
4 miles
The ________ the Q of a circuit, the narrower is its bandwidth.
lower
higher
broader
selective
Data selector is also called
encoder
decoder
multiplexer
demultiplexer
The code 1011 in BCD is
24
letter A
11
invalid
What is the equivalent of hexadecimal 1A in decimal?
27
26
42
40
________ is the voltage applied in direct current circuit having a power of 36 watts and total resistance of 4 ohms.
6 V
9 V
24 V
12 V
A two-pole, one phase motor has _______ field poles.
8
2
6
4
_______ is a device used to store electrical energy in an electrostatic field?
Inductor
Battery
Transformer
Capacitor
A memory circuit that has address inputs has how many storage locations?
1024
256
512
not determined by sets of input
High sensitive DC voltmeter provides accurate reading when measuring _______ circuits.
zero resistance
low resistance
at any resistance
high resistance
