EE OBJECTIVES August 15, 2021 Flashcards
- Which of the following type of fault that used only the equivalent positive impedance of the circuit in the short-circuit calculation? *
Three-phase fault
Line-to-line fault
Double-line-to-ground fault
Single-line-to-ground fault
Three-phase fault
- Two 110-V light bulbs, one “25” and the other “100W”, are connected in series to a 110 V source. Then, which of the following statement is correct with regard to above sentence? *
None of these
the current in the 100-W bulb is less than that in the 25-W bulb.
Each bulb will have a potential difference of 55V.
The current in the 100-W bulb is greater than that in the 25-W bulb.
None of these
- A substance that changes its electrical resistance when illuminated by light is called : *
Photovoltaic.
Photoconductive.
Photoelectric.
None of these.
Photoconductive.
- What does PEMC in EPIRA stands for *
Philippine Energy Market Corporation
Philippine Electricity Market Corporation
Private Energy Marketing Company
Philippine Electrical Marketing Corporation
Philippine Electricity Market Corporation
- The size of conductor on EHV lines is obtained based on *
current density
corona
voltage drop
current density and voltage drop
corona
- Residual magnetism is necessary in a *
separately excited generator
self-excited generator
both of these
none of these
self-excited generator
- As load power factor of an alternator becomes more leading, the value of generated voltage required to give rated terminal voltage __________. *
increases
decreases
remains unchanged
varies with rotor speed
decreases
- What is the primary advantage of FM over AM? *
FM has a greater bandwidth than AM
more complex
noise immunity
greater capture effect
noise immunity
- What is the IEEE device function number 21? *
overvoltage relay
undervoltage relay
distance relay
differential relay
distance relay
- If an electrical network having one or more than one voltage source, is transformed into equivalent electrical network with a single current source (which is the short circuit current of previous circuit) with parallel internal resistance of the network with all current source replaced by their internal resistance, this is called: *
Thevenin’s Theorem
Reciprocity Theorem
Superposition Theorem
Norton’s Theorem
Norton’s Theorem
- The conduction of electricity across the surface of a dielectric is called _________________. *
skin effect
surface effect
crosstalk
creepage
creepage
- The amount of magnetizing force to counter balance the residual magnetism of a magnetic material is referred to as *
coercivity
reluctivity
susceptivity
retentivity
coercivity
- The transient current in a loss free LC circuit when excited from an ac source is a/an __________ sine wave. *
over-damped
under-damped
critically damped
undamped
undamped
- For power transformers, the conservator tank is intended to minimize *
breathing
oil sludging
heating
internal pressure
oil sludging
47. A pure semiconductor without doping is called * Contaminated Extrinsic Doped Intrinsic
Intrinsic
48. A coil that opposes any change in current flow is called a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_. * transducer capacitor oscillator inductor
inductor
- If all other factors are held constant, the capacitance between a pair of parallel, flat, identical metal plates *
does not change as the surface area of the plates increases.
decreases as the surface area of the plates increases.
depends on the voltage applied to the plates.
increases as the surface area of the plates increases.
increases as the surface area of the plates increases.
52. In resistance welding, the SCR is closed during \_\_\_\_\_\_\_\_\_\_ time. * squeeze hold weld squeeze, weld and hold
weld
57. The overcurrent protective device is caused to operate by \_\_\_\_\_\_\_\_\_\_. * current flow voltage surge voltage drop impedance
current flow
60. In a transformer, the resistance between the primary and secondary must be * zero 1 kΩ 100 kΩ infinite
infinite
. While describing the sheath of a cable, the abbreviation XLPE means \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ polyethylene. * cross-layer cross-linked external-layer extra-long
cross-linked
When a current carrying conductor is brought into a magnetic field, the force that moves the conductor depends upon the \_\_\_\_\_\_\_\_\_\_. * the direction of the conductor the value of current the weight of the conductor none of these
the value of current
Which of the following types of heating process is used for surface hardening of the steel? * induction resistance dielectric infrared
resistance
An instrument having a voltage coil and a current coil would be a * wheatstone bridge voltmeter wattmeter ammeter
wattmeter
The calculation of the reliability indices of the grid owners as set by Philippine Grid Code shall include outages that occur *
due to generation deficit
on the secondary line system
on the transmission line
on the primary lines of the distribution line
on the transmission line
Two charged point particles are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude: *
the two particles have charges with opposite signs and the same magnitude
the two particles have charges with opposite signs and different magnitudes
the two particles have charges with the same sign but different magnitudes
at least one other charged particle is present
at least one other charged particle is present
. Conduction electrons move to the right in a certain wire. This indicates that: *
the current density and electric field both point right
the current density points right and the electric field points left
the current density points left and the electric field points right
the current density and electric field both point left
the current density and electric field both point left
. Ohm’s law is not applicable to * copper silver aluminum silicon carbide
silicon carbide
A test used to determine the equivalent resistance of an induction motor is * blocked rotor test no-load test short circuit test polarity test
blocked rotor test
Power lost due to alternating magnetization and demagnetization of the core material * copper loss hysteresis loss eddy current loss rheostat loss
hysteresis loss
A transformer has negative voltage regulation when its power factor is * zero lagging unity leading
leading
For the two conductors inside the conduit, the ampacity of the conductors shall be derated to what percent? * 90% 70% 80% none of these
none of these
A device or equipment which is suspended from overhead either by means of a flexible cord carrying the current, or otherwise. * Rosette Fixture Air terminal Pendant
Pendant
