SET A (EE) Flashcards
The resistance of a rod does NOT depend on
A. The shape of its cross-sectional area
B. its length
C. its material
D. its temperature
The shape of its cross-sectional area
Which of the following AC device is used to measure the angle between the voltage and its current?
A. reactive meter
B. power factor meter
C. demand meter
D. phase angle meter
phase angle meter
Which of the following define the meaning of load factor?
A. The ratio of average load to installed capacity.
B. The ratio of maximum load to average load.
C. The ratio of average load to maximum load.
D. The ratio of connected load to maximum load.
The ratio of average load to maximum load.
The coulomb force F acts on two charges a distance r apart. What is F proportional to?
A. r
B. 1/r^2
C. r^2
D. 1/r^3
1/r^2
If force on the conductor the answer is 1/r
If magnetic dipole the answer is 1/r^3
The starting / in rush current of the transformer is generally _____ times of its full load current.
A. 12
B. 20
C. 10
D. 6
10
Current has units of ______.
A. coulomb
B. ohm
C. coulomb/second
D. volt
coulomb/second
Which of the following is NOT a property of magnetic field lines?
A. The field is stronger where the lines are closer together.
B. The lines intersect surface of equal intensity at right angles.
C. Magnetic field lines have no beginning and no ends.
D. The lines cross themselves only at right angles.
The lines cross themselves only at right angles.
Which statement is true?
A. Magnetic flux lines have sources only
B. Magnetic flux lines have sinks only
C. Magnetic flux lines have both sources and sinks
D. Magnetic flux lines does not have sources and sinks
Magnetic flux lines does not have sources and sinks
The electric motor generally used in household food mixer
A. Shaded Pole
B. Universal
C. Split Phase
D. Capacitor Start
Universal
Wooden transmission poles are protected from termites using
A. creosote oil
B. essential oils
C. transformer oil
D. paraffin oil
creosote oil
The pumped hydro powerplant in Caliraya is used for _______ load.
A. standby
B. reserve
C. peak
D. base
peak
Transformers are used to change the value of the following EXCEPT:
A. alternating current
B. alternating voltage
C. power
D. resistance
power
Joule found out that the heat produced in a current carrying conductor is proportional
A. the square of the current
B. the current
C. the square of resistance
D. inversely proportional to time
the square of the current
The lighting load for a dwelling expressed in terms of a unit load in volt-ampere per square meter must be at least _______.
A. 24
B. 12
C. 16
D. 28
24
If hotel/motel the answer is 16
If office/banks the answer is 28
The specific resistance ρ is defined as
A. resistance of a conductor has a length of 1 m and cross-section of 1 m² at 20 °C
B. resistance of any conductor at 25 °C
C. resistance of any conductor at 20 °C
D. resistance of a conductor has a length of 1 m and cross-section of 1 cm² at 20 °C
resistance of a conductor has a length of 1 m and cross-section of 1 m² at 20 °C
In which type of electronic communications does the information travel in two directions?
A. Half duplex
B. Full duplex
C. Multiplex
D. Bicomm
Full duplex
Which of the following is a primary disadvantage of FM over AM?
A. Lower efficiency
B. Noise susceptibility
C. Higher cost and complexity
D. Excessive use of spectrum space
Excessive use of spectrum space
In a transmission line of negligible resistance, the surge impedance will be _________.
A. square root of LC
B. square root of L/C
C. square root of 1/LC
D. square root of C/L
square root of L/C
What is the effects on current flow does in reversing the direction of movement of a conductor in the magnetic field of a generator?
A. It will increase the current flow.
B. It reverses the direction of current flow.
C. It will neutralizes the current flow.
D. It has no effect on the current flow.
It reverses the direction of current flow.
What is the maximum output power of a cellular transmitter?
A. 4.5 W
B. 1.5 W
C. 3 W
D. 6 W
3 W
The copper loss of the transformer ______ in/of the power factor.
A. not affected by a change
B. increase with the lowering
C. increase with an increase
D. decrease with the lowering
increase with the lowering
An excellent indicator of the condition of the oil in the power transformer is obtained by dividing the IFT (interfacial tension) by the NN (neutralization number). This ratio is known as the ___________.
A. Neutralization Number
B. Myers Index Number
C. Polarization Index Number
D. Transformer turn ratio
Myers Index Number
What is the maximum number of quarter bends permitted in rigid metal conduits between outlets?
A. 1
B. 3
C. 2
D. 4
4
Tesla is the unit of
A. magnetic induction
B. self-inductance
C. magnetic flux
D. none of these
magnetic induction or magnetic flux density
The transformer oil used in transformers provide
A. cooling and lubrication
B. insulation and lubrication
C. insulation and cooling
D. insulation, cooling and lubrication
insulation and cooling
Which of the following type of fault used only the equivalent positive sequence impedance of the circuit in the short-circuit calculation?
A. Line to line
B. Line to ground
C. Double line to ground
D. Three-phase fault
Three-phase fault
Based on Philippine Distribution Code, which of the following interruption events is NOT excluded in the calculation of distribution utility reliability indices?
A. outages that occur on 230 v lines
B. outages due to 500 kV lines
C. outages on 34.5 kV lines
D. outages due to generator failure
outages on 34.5 kV lines
What is the device function number for overcurrent relay?
A. 27
B. 67
C. 50
D. 51
51
Is an electrical instrument connected across the load.
A. voltmeter
B. ammeter
C. ohmmeter
D. wattmeter
across means parallel
SO the answer is voltmeter
What is the formula for the synchronous speed of a motor?
A. Ns = (120P) / f
B. Ns = 120fP
C. Ns = (120f) / P
D. Ns = (60f) / P
Ns = (120f) / P
Nuclear reactors generally employ
A. fusion
B. fission
C. both fusion and fission
D. none of these
fission
In a series RLC circuit, the current at resonance is ______.
A. zero
B. infinity
C. minimum
D. maximum
maximum
For continuous load, the maximum current is expected to continue for __________.
A. 2 hours
B. 4 hours
C. 6 hours or more
D. 3 hours or more
3 hours or more
The equivalent of 1 + a + a² is
A. 0
B. 1
C. 1 + j
D. -1
[solvable] Answer: 0
What is ACSR conductor stand for?
A. All conductors Surface Treated and Realigned
B. Aluminum Cable Steel Reinforced
C. Anodized Core Steel Reinforced
D. Aluminum Cable Stranded Reinforced
Aluminum Cable Steel Reinforced
Which plant takes the least time in starting from cold conditions to full load operation?
A. Steam turbine power plant
B. Hydro power plant
C. Gas turbine power plant
D. Nuclear power plant
Hydro power plant
RA 7832
A. pilferage of electricity, theft of transmission materials and capping of system loss
B. pilferage of electricity, theft of transmission materials and rationalizing of system loss
C. pilferage of electrical energy
D. pilferage of electricity and electrical materials
pilferage of electricity, theft of transmission materials and rationalizing of system loss
PDC in EPIRA means
A. Philippine Distribution Company
B. Philippine Distribution Corporation
C. Philippine Distribution Commission
D. Philippine Distribution Code
Philippine Distribution Code
Open circuit test on transformers is conducted to determine
A. hysteresis loss
B. copper loss
C. core loss
D. eddy current
core loss
When the sole purpose of ac is to produce heat, the selection of conductor is based on ________ value of the current.
A. Average
B. Maximum
C. Instantaneous
D. RMS
RMS
The net reactance in a series RLC circuit is
A. XL
B. XC
C. XL - XC
D. XL + XC
XL - XC
When the current and voltage are out of phase by 90 degrees, the power is
A. average
B. maximum
C. minimum
D. zero
zero
The readings of the wattmeter will be same in the two-wattmeter method when
A. load in one phases is zero
B. power factor is 0.50
C. power factor is unity
D. neutral is grounded
power factor is unity
The effective resistance of conductor is increased by
A. skin effect
B. proximity effect
C. corona effect
D. both A and B
both A and B
Which of the following is NOT permitted by the Philippine Electrical Code under certain conditions as substitute for grounding.
A. isolated
B. unguarded
C. insulated
D. guarded
unguarded
Which of the following is NOT considered in analyzing a short transmission line?
A. inductance
B. series impedance
C. shunt admittance
D. power losses
shunt admittance
In an RLC circuit, the impedance at resonance is __________.
A. zero
B. infinity
C. maximum
D. minimum
minimum
Based load plants are designed to supply power at ____________.
A. low capital cost and low operating cost
B. high capital cost and low operating cost
C. low capital cost and high operating cost
D. high capital cost and high operating cost
high capital cost and low operating cost
