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WorksheetsELECS 10
Total questions: 50
Worksheet time: 25mins
How much current does an electrostatic voltmeter require through it to operate?
Zero current
Below one ampere
One ampere
Very high current
Determine the equivalent work of 166 watt – second
166 Joules
100 Joules
16.6 Joules
10 Joules
Characteristics of the current flow in a series R-L-C circuit at resonance
it is dc
it is at a minimum
it is zero
it is at a maximum
What is the value of a resistor with colours from left. Orange, blue, gold and silver?
34 ohms +/- 10%
3.6 ohms +/- 10%
3.4 ohms +/- 10%
36 ohms +/- 10%
Which of the following characterizes inductance?
tends to oppose dc
tends to oppose changes in voltage
tends to oppose changes in current
oppose all frequencies equally
One of the following does not refer to the internal component of a klystron oscillator
a collector plate
a pair of plates
a pair of catcher grids
a pair of buncher grids
How can electrical current be inducted with a coil and a magnet?
holding the coil and the magnet perfectly stationary
moving either the magnet or the coil
placing the coil parallel to the magnetic field
placing the coil at right angles with the magnetic field
Which of the following integrated circuit contains the most gates?
LSI
MSI
VLSI
SSI
Which of the following is not primary type cell?
Zinc chloride
Silver zinc
Silver oxide
Carbon zinc
A Transformer consist of the following
an inductance and resistance
a parallel resonant circuit
a capacitor and inductor
two coils wound on a common core
What type of tube is used to display a signal on an oscilloscope?
Filament tube
Cathode ray tube
Tetrode
Pentode
Meaning of the term transition region with regard to a transistor.
the point where wire leads are connected to the P or N type material
an area of low charge density around the P-N junction
The area of maximum P-type charge
The area of maximum N-type charge
What is the resonant frequency of a circuit when L of 25 micro henrys and C of 10 picofarads are in parallel?
63.7 MHz
10.1 MHz
63.7 KHz
10.1 KHz
When should a fuse be replaced with a higher rated unit?
Never
When the original value is not available
If it blows
When the fuse of the original value is small in size
What is the resonant frequency of a circuit when L of 3 micro henrys and C of 40 picofarads are in series?
1.33 MHz
14.5 kHz
1.33 kHz
14.5 MHz
Find the two stable operating conditions of SCR
conducting and non-conducting
oscillating and quiescent
NPN conduction and PNP Conduction
forward conducting and reverse conducting
A filter having a single continuous transmission band with neither the upper nor the lower cut off frequencies being zero to infinite is called _______
Band pass filter
Longitudinal suppression filter
High pass filter
Band rejection filter
What physical effect will a two parallel wires and with the same direction of current flowing over them?
maintain position
repel each other
no physical effect
attract each other
Determine which item is not a storage device
Card readers
CD-ROM
Diskettes
Magnetic tape
Find the frequency in kilocycles per second in the armature of a 10 pole, 1,200 rpm generator
100
1000
10
0.100
Ohm’s law refers to ________.
A current is directly proportional to both voltage and resistance
power is directly proportional to the resistance and inversely as the current squared
power is directly proportional to both voltage squared and the resistance
current varies directly as the voltage and inversely as the resistance
A transistor acts as _________ when saturated.
open circuit
very low resistance
very high resistance
variable resistance
Another very useful cell similar to solar cells however the junction is bombarded by beta particles from radioactive materials
Alkaline cells
Nucleus cells
Selenium cells
Lithium cells
What is an element in electronics which serves as a protection against overload?
Fuse
Resistor
Mica
Semiconductor
If two 0.25 micro farad capacitors are connected in series, what will be the total effective capacitance?
0.125 microfarad
0.0624 microfarad
2.5 microfarad
0.50 microfarad
In semiconductor technology the characteristics of a transistor in a cut off refers to a condition when
the transistor is at its operating point
no current flow from emitter to collector
there is no base current
maximum current flows from emitter to collector
Find the current that flows through the filament of a 400 watts flat iorn connected to a 220v power line
50 ma
5 a
5 ma
500 ma
An electronic device draws 300 watts from its 24 volt power source. Find the effective resistance
1.92 ohms
19.2 ohms
1.25 ohms
12.50 ohms
_______ is not a type of flip flop
RS
Latch
D
Register
Which are the principal characteristics of a tunnel diode?
a very high PIV
a high forward current rating
a high forward resistance
a negative resistance region
What is the flux density in gauss (G) having a flux of 12,000 Mx through a perpendicular area of 6 m squared?
2000 G
72000 G
72 G
200 G
What is the distinguishing feature of a class C amplifier?
output is present for less than 180 degrees of the input signal cycle
output is present for the entire signal cycle
output is present for exactly 180
output is present for more than 180 degrees but less than 360 degrees of the input signal
How many nodes are needed to completely analyze a circuit according to Kirchhoff’s current law?
two
all nodes in the circuit
one less than the total number of nodes in the circuit
one
What is the process of designing more than 100 gates on a single chip?
LSI
SSI
MSI
VLSI
which of the following cannot be used to make a magnet
Carbon
Cobalt
Iron
Lodestone
The two general types of heating methods in industrial electronics are
frequency and induction heating
induction and dielectric heating
coil and dielectric heating
coil and frequency heating
________ signal represent the true signal in the truth table
Two
One
Zero
Four
The arrow in the schematic symbol for a diode points in which way?
towards the cathode
in the direction of the current flow
towards the anode
towards the magnetic north
In applying the right hand rule by holding a conductor with your right hand so that the thumb represents the current, the encircling fingers around the conductor represent ________
Electric lines of force
Electromagnetic field intensity
Magnetic lines of force
Electronic field of force
Which of the following describes the action of a capacitor
converts ac into dc
stores electrical energy
opposes changes in the current flow
creates a dc resistance
What do you call the phenomenon whereby substance attracts particle of iron
Permeability
Magnetism
Naturalism
Electromagnetism
Low sensitive dc voltmeter provides accurate reading when measuring _____ circuits
At any resistance
Low resistance
Zero resistance
High resistance
What should be the resolution of a digital voltmeter having a three digit 0-3 V?
15 V
3 mv
½ micro volt
30 mv
The impedance in the study of electronics is represented by resistance and ______
Inductance and capacitance
Inductance
Reactance
Capacitance
One of the following is characteristics of a direct current dc supply voltage
its output reverses polarity
its value cannot be stepped up or down by transformer
easier to amplify
fluctuates
What kind of voltage is applied to the horizontal deflection plates of the oscilloscope
Trigger voltage
Signal voltage
Sweep voltage
Supply voltage
Loop currents should be assumed to flow in which direction?
Straight
Either c or d arbitrarily selected
Counter clockwise
Clockwise
______ is a parallel LC circuit
Parallel resisting circuit
Static circuit
Tank circuit
Hartley circuit
Find the half power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and a Q of 218.
606 kHz
58.7 kHz
16.5 kHz
47.3 kHz
Which type of meter requires its own power source
an voltmeter
an ammeter
an ohmmeter
a wattmeter
