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WorksheetsECT - Extra
Total questions: 42
Worksheet time: 21mins
Electromagnetic waves travels ______.
at the speed of sound
at the speed of light
depending on the frequency
more than the speed of light
RA9292 is composed of ___ Articles.
5
6
8
9
What is Section 42 of RA9292?
Repealing Clause
Separability Clause
Effectivity
Appropriations
What is Section 4 of RA9292?
Definition of Terms
Statement of Policy
Nature and Scope of PECE, ECE, and ECT
Categories of Practice
According to RA9292, It is defined as any variety of electronic devices that is capable of accepting data, programs and/or instructions, executing the programs and/or instruction to process data ang presenting the results
Electronics
Communications
Computer
Telecommunications
What is the range of frequency for VHF?
30 - 300 MHz
30 - 300 kHz
3 - 30 MHz
30 - 300 GHz
The green wire on a 3-phi system is for _____ connection.
neutral
ground
nothing
supply
A single-phi ideal transformer (240/2880) with the primary connected to a 240 V source with a cable resistance of 3Ω, and load resistance connected to the secondary is 720 Ω. What is the power dissipated at the load?
5.4 kW
4.3 kW
3.4 kW
4.5 kW
What is the function of a A118 diode?
Power Diode
General Purpose
Zener
Tuning
What safety precautions should you take before beginning repairs on an antenna?
Inform your neighbor so they are aware of your intentions
Turn off the main power switch in your base
Be sure you and the antenna structure are grounded
Be sure to turn off the transmitter & disconnect the feedline
If an ammeter marked in amperes is used to measure a 3000 milliampere current, what reading would it show?
0.003 amperes
3 amperes
0.3 amperes
3 000 000 amperes
Why do resistors sometimes get how when in use?
Their reactance makes them heat up
Hotter circuit components nearby heat them up
They absorb magnetic energy which makes them hot
Some electrical energy passing through them is lost as heat
The letter "R" is the symbol for
impedance
resistance
reluctance
reactance
What is the equivalent power (in dBm) of an input power of 1mW?
0
30
40
50
Two conductors with the same resistance are connected in parallel, what is the total resistance?
1/4 the resistance of one of the conductors
1/2 the resistance of one of the conductors
equal to the resistance of the conductors
double the resistance of the conductors
Given a geometric progression, where the 1st term is 2 and the 5th term is 162, find the 3rd term.
18
12
20
24
Given the 5(x-2)=15. What is the value of 3x-1
13
14
16
12
Given: log_b 2 = a, log_b 3 = c, log_b 5 = d. What is the value of log_b (24/25)?
3a+c-2d
a^3+c-d^2
a^2+c-d^3
a+2c-4d
The current flowing across a 20 Ω resistor is 2.4 amperes, what is the voltage across the resistor?
52 V
48 V
24 V
220 V
The input impedance of a circuit is 576 Ω, if a transformer is used to match the input to the load impedance of 9 Ω. What must be the turns ratio of the transformer?
1:6
1:8
1:4
1:10
The input impedance of a circuit is 300 Ω, if a transformer with primary to secondary turns ratio of 2:1, what must be the load impedance connected at the secondary?
1200
300
75
150
A circuit supplies 200 V with current flow of 100 mA. If the load power is 8.5 watts. How much power was wasted?
11.5 W
13.5 W
10.5 W
12.5 W
A circuit has a total input power of 120 watts. If the power loss amounts to 19.5 W, what is the dissipated power at the load?
111.5 W
110.5 W
100.5 W
95.5 W
What is the formula to calculate the duty cycle?
(tPw)⋅100%
(PRTPRF)⋅100%
(PRFPRT)⋅100%
(Pwt)⋅100%
What is the indication of a short on the input of a load gate?
Only the output of the defective gate is affected.
There is signal loss to all gates on the node.
The affected node will be stuck in the LOW state.
There is a signal loss to all gates on the node, and the affected node will be stuck in the LOW state.
An SCR acts to control the speed of an electric motor by ______ the ______ of the pulse delivered to the motor.
increasing, amplitude
varying, width
decreasing, gate width
none of these
Which of these materials is best for a ground rod driven into the earth?
Hard plastic
Copper-clad steel
Fiber glass
Iron or Steel
Which test equipment best allows a comparison between input and output signals?
Oscilloscope
Logic probe
Spectrum Analyzer
Multi-trace Oscilloscope
Which device would best aid in shorted tract detection?
Multimeter
Current Tracer
Logic Pulser
Oscilloscope
What is the zero-voltage switch used for?
To control low-voltage circuits
To provide power to a circuit when power is lost
For extremely low-voltage applications
To reduce radiation of high frequencies during turn-on of a high current to a load
Using a voltmeter, you placed the red lead of the meter to side where the diode marking is present; then, you measured a value of -0.6 V across it. Then, the diode is:
Forward biased, with leads connected properly
Forward biased, with leads reversed
Reversed biased, with leads connected properly
Reverse biased, with leads reversed
The output frequency of a half-wave rectifier is ______ to the input frequency.
twice
half
equal
greater than
A metal oxide varistor is used for protection against:
high voltage
high current
high noise current
both current and voltage
You have a transmission line rated 150 pF/ft. What will be the capacitance 1 mile away?
792 nF
927 nF
297 nF
279 nF
A capacitor with capacitance of 12 nF, separation between plates of 0.1 mm, a cross-sectional area of each plate is 1 cm^2. Determine the value of the relative permittivity
1255
1355
1455
1555
According to NTC Memorandum Circular 09-09-2003, _______ are radio equipment and devices with an external antenna, e.g. WLAN cards or other similar cards directly sold to the end-users, WLAN enabled portable computers, Bluetooth enabled mobile phones, Bluetooth enabled portable computers and personal digital assistants.
Low Power Devices
Indoor Devices
Indoor Equipment & Devices
Low Power Equipment & Devices
In power systems, the power factor is defined as _______.
ratio of reactive to apparent power
ratio of true to apparent power
angle between the apparent and true power
the sine of the angle between apparent and true power
What is the effect of adding a 20 Ω resistor in parallel with a 100 Ω resistor connected to the supply voltage, to the current flowing on the circuit?
increase
decrease
unchanged
cannot be determined
In power systems, why should you prevent using gasoline in an occupied area?
To prevent carbon monoxide poisoning
Due to lack of oxygen
Due to lack of nitrogen
None of these
Which is TRUE about performing measurements using a meter?
Rely on jumpy reading
Measure parameters while power is on
Supply power to the circuit before measurement
Turn off the power meter if not in used, to conserve energy
Which is FALSE about performing measurements using a meter?
Perform measurements while power is on
Adjust the sensitivity of the meter for accuracy
Remove the power supplied to the circuit
The leads must be connected properly based on the parameter being measured
What is the advantage of RTDs over Thermocouples?
Accuracy
Response Time
Size
Temperature Range
