ECT Pre Board Exam 3

What is also known as "Stick and Click"?

LC connector

Registered Jack or RC

SC or subscriber connector

ST or Straight tip connector

SC or subscriber connector

With regards to AWG standards, which gauge of wire has a bigger cross-sectional area?

18 AWG

16 AWG

20 AWG

24 AWG

16 AWG

What color is the binder for pairs 51-75 in a 100-pair cable?

Black

Blue

Red

Green

Green

What type of diagram shows electrical connections and functions of a specific circuit arrangement?

Ishikawa and single-line

Block

Schematic

Pictorial

Schematic

What conducts electricity within a switchboard, distribution board, substation, battery bank or other electrical apparatus?

Busbar

Fuse

Conductor wire

Grounding pit

Busbar

Why is a differentiator used at the input of a flip-flop?

To provide high input impedance

To produce a rounded waveform

To produce a sharp spike

To provide negative resistance

To produce a sharp spike

In a resistive-capacitive circuit the vector line relationship shows two lines perpendicular to each other. What is the phase relationship?

90 degree

180 degree difference

In phase

Out of phase

90 degree

What DILG Memorandum directs LGUs to engage the assignment of duly registered PECE or ECE as part of the of staff of provincial or municipal/city government?

Memorandum Circular No. 2013 - 01

Memorandum Circular No. 2013 - 04

Memorandum Circular No. 2013 - 02

Memorandum Circular No. 2013 - 03

Memorandum Circular No. 2013 - 01

In a class 'C' collector:

collector current flows for less than one half cycle of the input signal.

output current flows for the complete cycle of the input.

collector current will flow for approximately 180 degrees (half) of the input signal.

collector current is cut off during one-half of the input signal.

collector current flows for less than one half cycle of the input signal.

What is the operating temperature of the omni-directional antenna used in distribution antenna system?

- 40°C to + 60°C

- 40°C to + 40°C

- 40°C to + 25°C

- 40°C to + 85°C

- 40°C to + 60°C

What is the minimum vertical clearance for installation of cable above residential driveways?

5.5 m or 18 ft

7.3 m or 24 ft

4.7 m or 15.5 ft

10 m or 32 ft

4.7 m or 15.5 ft

What is the minimum vertical clearance for installation of cable above railroad tracks?

4.7 m or 15.5 ft

5.5 m or 18 ft

10 m or 32 ft

7.3 m or 24 ft

7.3 m or 24 ft

What is meant by "transformer action"?

The transfer of load voltage to the center-tapped secondary through capacitance

The transfer of energy from one circuit to another circuit by magnetic rectification

The action in which an expanding and contracting magnetic field around the primary winding cuts the secondary winding and induces a direct voltage into the winding

The transfer of energy from one circuit to another circuit by electromagnetic induction

The transfer of energy from one circuit to another circuit by electromagnetic induction

RF exposure from portable radio transceivers may be harmful to the eyes because:

Magnetic fields blur vision.

RF heating may cause cataracts.

The magnetic field may attract metal particles to the eye.

RF heating polarizes the eye lens.

RF heating may cause cataracts.

Coulomb's Law describes the forces of attraction or repulsion between electrical charges, which are _________ to the product of the charges _________ to the distance between them.

inversely proportional, directly proportional

indirectly proportional, directly proportional

directly proportional, inversely proportional

inversely proportional, indirectly proportional

directly proportional, inversely proportional

What is the frequency of the sine wave below?

150 Hz

450 Hz

350 Hz

250 Hz

250 Hz

When calculating power levels, which formula is correct?

dB = 0.5log (P₁/P₂)

dB = log (P₁/P₂)

dB = 20log (P₁/P₂)

dB = 10log (P₁/P₂)

dB = 10log (P₁/P₂)

What is strongly recommended to use to secure cable bundles?

Electrical tapes

VELCRO fasteners

Plastic tie wire

All choices are correct

VELCRO fasteners

Given the series capacitive circuit below, what is the total capacitance?

0.016 μF

0.008 μF

0.180 μF

0.080 μF

0.008 μF

What transformer turns ratio is required to match a 16-Ω speaker load so that the effective load resistance seen at the primary is 10 kΩ?

15:1

20:1

25:1

10:1

25:1

In a capacitive circuit, what is the voltage and current relationship?

Current lags

Voltage leads

Resistance leads

Voltage lags

Voltage lags

What is the voltage at terminal 'A' for the Wheatstone bridge below? All values of resistances are in kΩ.

1.43 V

1.34 V

1.86 V

1.12 V

1.86 V

________ is the probability of a call in a circuit group being blocked or delayed for more than a specified interval, expressed as a vulgar fraction or decimal fraction.

Grade of Intensity

Grade of Traffic

Grade of call

Grade of Service

Grade of Service

How long would it take a girl bicycling at 17 mph to overtake her instructor bicycling at 7 mph along the same path, assuming that her instructor had a 3-hour head start?

2 hours 6 minutes

3 hours

3 hours 12 minutes

2 hours 15 minutes

2 hours 6 minutes

What is the minimum vertical clearance for installation of cable above sidewalk and other pedestrian traffic areas?

3.5 m or 11.5 ft

5.5 m or 18 ft

4.7 m or 15.5 ft

7.3 m or 24 ft

3.5 m or 11.5 ft

If the radius of a right cylinder is doubled and the height is tripled, its volume is

multiplied by 12

multiplied by 3

multiplied by 2

multiplied by 6

multiplied by 12

Registration without Examination for Electronics Technicians is provided in what section of R. A. No. 9292?

Section 20

Section 18

Section 19

Section 21

Section 20

What test looks for cable faults (opens, shorts, grounds) and measures the electrical conductivity and continuity of the cable system?

Visual fault finder test

Trace test

All choices are correct

Wire map test

Wire map test

Which of the following is equivalent to (3/2) log₂ 4 - (2/3) log₂ 8 + log₂ 2?

log₂ 2

- 1

2

- 2

2

Why is flux used when soldering?

To act as a bonding accelerant.

To prevent cold solder joints

To add impurities into the solder

To prevent the formation of metal oxides at extreme temperatures

To prevent the formation of metal oxides at extreme temperatures

If f(x) = x² - 2, then f(3) =

1

2

9

7

7

Calculate the voltage drop across C₁.

6.6 V

3.6 V

5.4 V

4.7 V

4.7 V

What is feed to the antenna to produce electromagnetic wave?

Power cable

Transport equipment

Indoor radio unit

Outdoor radio unit

Outdoor radio unit

What is the minimum vertical clearance for installation of cable above roads, streets, alleys, non-residential driveways, parking lots and other areas subject to truck traffic?

10 m or 32 ft

7.3 m or 24 ft

5.5 m or 18 ft

4.7 m or 15.5 ft

5.5 m or 18 ft

What is a primary advantage of a FET when compared to the bipolar transistor?

No advantage

Gate biasing is resistive controlled

High input impedance

Low input impedance

High input impedance

Section 39 of the R. A. No. 9292 is about ______.

Implementing of Rules and Regulations

Repealing Clause

Separability Clause

Appropriations

Implementing of Rules and Regulations

What IEEE standard is for Power over Ethernet (PoE)?

802.3

802.2

802.11

802.3af

802.3af

What would be the maximum current to safely illuminate a LED?

500 milliamps.

20 mA.

1 amp.

1 microamp.

20 mA.

The basic properties associated with alternating voltage and current are:

frequency, period, designation and amplitude.

frequency, deviation, wavelength and amplitude.

magnitude, period, wavelength and amplitude.

frequency, period, wavelength and amplitude.

frequency, period, wavelength and amplitude.

Honey Lynn has a bucket of candy containing 15 lollipops, 25 gumballs, 35 licorice sticks, and no other types of candy. If Honey Lynn selects one type of candy at random, what is the probability that the chosen candy will be a licorice stick?

1/5

3/10

7/15

1/3

7/15

What happens to the beamwidth of an antenna as the gain is increased? The beamwidth:

Increases arithmetically as the gain is increased.

Increases geometrically as the gain is increased.

Decreases as the gain is increased.

Is essentially unaffected by the gain of the antenna.

Decreases as the gain is increased.

What is the description of an optoisolator?

A P-N junction that develops an excess positive charge when exposed to light.

An LED and a capacitor.

An LED and a photosensitive device.

An LED and a lithium battery cell.

An LED and a photosensitive device.

A 12-V auto battery is rated at 36 Ah. If a 100-W, 12-Vdc bulb is connected across this battery, about how long will the bulb stray lit, if the battery has been fully charged?

4 hours and 30 minutes

4 hours and 40 minutes

4 hours and 20 minutes

4 hours and 50 minutes

4 hours and 20 minutes

What is the most efficient protection for fiber optic cable?

Electro metallic conduit (EMC) and electro metallic tubing (EMT)

Intermediate metal conduit (IMC)

Rigid steel conduit (RSC)

Polyvinyl chloride (PVC) pipe

Electro metallic conduit (EMC) and electro metallic tubing (EMT)

Any person found to have violated the R. A. No. 9292 shall be, upon the discretion of court, be imprisoned for not less than ______.

1 year

3 months

6 months

1 month

6 months

Lead and tin solder at a respective percentage of 63/37 melts at ______.

351°F

341°F

155°F

361°F

361°F

What are three types of materials used in electronics?

Conductors, semi-conductors and insulators

Insulators, conductors and interions

Conductors, insulators and regulators

Semi-conductors, insulators and semi-insulators

Conductors, semi-conductors and insulators

An oscilloscope with two vertical inputs, is commonly referred to as a _______ oscilloscope.

multi-tracesweep trigger-trace

modulation-trace

dual-trace

dual-trace

What is otherwise known as Revised Fire Code of the Philippines of 2008?

R. A. No. 9514

R. A. No. 9451

R. A. No. 9541

R. A. No. 9415

R. A. No. 9514

The magnetic field that surrounds a magnet can best be described as invisible lines of force, and are commonly referred to as:

lines of density.

lines of flux proportionality.

lines of flux.

lines of attraction.

lines of flux.