EE EXCEL Preboards 1
EE Excel Preboards Quiz
Test your knowledge with our comprehensive EE Excel Preboards Quiz! This quiz contains 56 questions covering various topics in electrical engineering, designed to help you prepare effectively.
Whether you are a student, teacher, or enthusiast, this quiz will challenge your understanding and reinforce your learning.
- 56 Multiple Choice Questions
- Covers topics from diodes to modulation
- Suitable for students and professionals alike
It is the barrier potential for a silicon diode.
0.7 V
0.5 V
1 V
0.3 V
A type of electronic communication in which only one party transmits at a time.
Full duplex emulation
Half duplex
Full duplex
Simplex
_____ is an instrument connected across the load.
Ohmmeter
Voltmeter
Wattmeter
Ammeter
Slip rings are made of:
Steel
Copper
Mica
Bakelite
Which of the following shall be included in the calculation of the reliability standard indices of the distributor asset by the Philippine Distribution Code?
Outages that occur on the secondary lines of the distribution system
Outages that occur in the transmission line
Planned outages where the customers have been notified at least three (3) days prior to the loss of power.
Outages that occur on the primary lines of the distribution system
A distributor is designed from the point of view of _____.
Voltage drop and current carrying capacity
Voltage drop
Load capacity
Current carrying capacity
Class II locations are considered hazardous because of the presence of _____ sufficient to create the potential for combustion.
Combustible dust
Combustible fyings
Ignitable vapors
All of the choices
. Centrifugal switch disconnects the auxiliary winding of the motor at about _____ percent of synchronous speed.
100
80 to 90
70 to 80
30 to 40
A 4-way switch controls a lamp from _____ different locations.
4
3
2
1
Which of the following instruments is suited for high frequency measurements?
Oscilloscope
Thermocouple
Moving iron vane
Dynamomete
A load of 50 A must be protected by _____ AT inverse time circuit breaker.
62.5 A
125 A
80 A
250 A
An RL circuit will have a time constant of:
L/R
RL
-R/L
R/L
Modulation is used to:
Increase the carrier power
Allow the use of practical antennas
Shorten the transmission channel
Reduce the bandwidth used
Measured in Hertz, it is the number of cycles of alternating current per second.
Frequency
Peak to peak
Wavelength
Period
For an unbalanced load, which connection is suitable?
4-wire wye connectio
3-wire open delta
3-wire wye connection
3-wire delta connection
1 Weber is the same as :
1 V/s
1 T/m
1 T/s
1 T m²
The definition of ambient temperature is _____.
The temperature of the area surrounding the conductor
The maximum heat the insulation can be used within
The insulation rating of the conductor
The temperature of the conductor
If the field of a dc shunt motor is opened:
The motor will stop.
It will continue to run at its rated speed.
The speed of the motor will become very high.
The speed of the motor will decrease.
Faraday’s law states that an induced emf is proportional to:
Zero
The rate of change of the magnetic flux
The rate of change of the electric field
The rate of change of the magnetic field
The government agency created under presidential decree 269, whose additional mandates includes preparing electric cooperatives in operating and competing under a deregulated electricity market.
National Power Corporation
National Electrification Administration
National Electrification Commission
National Grid Corporation
These are type of materials that has 5 – 8 valence electrons.
Resistors
Conductors
Insulators
Semiconductors
Name the effect which is resulted because of the size of conductor, frequency, and the specific resistance of conducting material.
Thompson effect
Corona effect
Skin effect
Proximity effect
Silica gel prevents air moisture from entering the outdoor transformer tank. It is placed in:
Core
Windings
Conservator
Breather
An induction motor is analogous to:
Two winding transformer with open circuit secondary
3 winding transformer
Autotransformer
Two winding transformer with short circuit secondary
Current has units of _____.
Volt
Coulomb/second
Ohm
Coulomb
The type of AC distribution system commonly used to supply both light and power is the _____.
Open Delta
3-phase wye
3-phase wye with neutral
3-phase delta
Which of the following methods of generating electric power from the sea water is more advantageous?
Ocean power
Brayton power
Waterpower
Tidal power
It is defined as the total number of sustained Customer power interruptions within a given period divided by the total number of Customers served within the same period.
System Average Interruption Frequency Index
Customer Average Interruption Frequency
System Average Interruption Duration Index
Customer Average Interruption Duration Index
What is the main reason that alternating current replaced direct current for general used?
AC voltages conveniently transformed.
AC generators do not need slip rings
A given AC current does not heat a power line as much as the same as DC current.
AC minimizes magnetic fields
Which of the following transformer has only one winding?
Current
Power
Distribution
Autotransformer
In a series resonant RLC circuit, all of the following statements are correct EXCEPT one. Which one is this?
The phase angle between the voltage and the current vectors is zero.
The current is a maximum
The resonant frequency is dependent on the resistance of the circuit
The impedance is a minimum.
The turbine used for high head in hydro power plant is:
Francis turbine
Pelton turbine
None of the choices
Kaplan turbine
The causes of nearly all high voltage flashovers in transmission lines are due to one of the following. Which one is the following?
Dust and dirt
Lightning discharges
Corona
High humidity
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs _________.
At the center
Far from the sphere
At the surface
Just outside the surface
. In long transmission line, at no-load, the receiving end voltage as compared to the sending end voltage is I. Higher II. Lower III. Remains the same
I only
II only
Either I or II
III only
The effect of the dielectric is to:
Decrease the capacitance
Reduce the working voltage
Increase the working voltage
Increase the capacitance
If the reference bus is changed in two load-flow runs with the same system data and power obtained for reference bus taken as specified P and Q in the latter run,
The system losses as well as complex bus voltage will be unchanged
The system losses will be unchanged but complex bus voltages will change
The system losses will change but complex bus voltages remain unchanged
The system losses as well as complex bus voltage will change
During load shedding:
System frequency is reduced.
Some loads are switched off
System power factor is cha
System voltage is reduced.
Given a transfer function of T(s) = 5/(s + 3)(s + 6), state the nature of the response.
Underdamped
Overdamped
Critically damped
Undamped
What device is used to measure the temperature of a motor winding while the motor is in operation?
Resistance temperature detector
Thermocouples
Seismic probe
Proximity probe
The units of the electric field are
NC²
N
C/N
N/C
The emf induced in a coil by the charging of current in the neighboring coils is known as _______ emf.
Mutually Induced
Speed
Self-Induced
Series
What color is reserved for equipment grounding only?
Green with white stripes
White
Green
Black
Ds is the GMR of each sub conductor of a four-sub conductor bundled and d is the bundle spacing. What is the GMR of the equivalent single conductor?
1.09 (Ds*d^2)^1/3
1.09 (Ds*d)^1/2
1.09 (Ds*d^3)^1/4
1.09 (Ds*d^2)^1/4
Which of the following type of fault that used only the equivalent positive impedance of the circuit in the shortcircuit calculation?
Line to line
Double line to ground
Line to ground
3-phase fault
Find the output response c(t) for the given transfer function C(s) = 5/s(s+5).
C(t) = -1 + e^-5
C(t) = 5 – 10e^-5t
C(t) = 1 – e^-5t
C(t) = 1 + e^-5t
Guy wire is used in the construction of distribution lines for what purpose? I. Transposition II. Interchange
Either I or II
I
II
Both I and II
This is the region where the transistor is working as a switch.
Active region
Cutoff region
Saturation region
Analog region
The resistance of resistor 1 is twice of resistor 2. The two are connected in series and a potential difference is maintained across the combination. What is the rate of thermal energy generation in resistor 1?
Twice that in Resistor 2
Half that in Resistor 2
The same as that in Resistor 2
Four times that in Resistor 2
The readings of the wattmeter will be same in the two-wattmeter method when:
Neutral is grounded
Power factor is unity
Load in one phase is zero
Power factor is 0.5
In PEC, continuous load shall not be greater than _____ of the branch circuit rating.
80%
100%
75%
125%
Two 110-V light bulbs, one 25W 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?
The current in the 100-W bulb is less than that in the 25-W bulb.
None of the choices.
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.
The resistance of a rod does not depend on _____.
Its material
The shape of its cross-sectional area
Its length
Its temperature
What is the phase relationship between current and voltage in an inductor?
Current lags voltage by 180 degrees.
Current lags voltage by 90 degrees.
In phase.
Voltage lags current by 90 degrees.
The selection of KAIC rating of circuit breaker is based on _____ current.
Symmetrical fault
Short-circuit
Full load
Asymmetrical fault
In an RC circuit connected across DC source, which of the following is zero at the beginning of transient stage?
Capacitor voltage
Resistor Voltage
Capacitor current
Resistor current
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