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WorksheetsELECTRICAL ENGINEERS PRE-BOARD EXAMINATION AUGUST 2016
Total questions: 30
Worksheet time: 15mins
Which of the following is not a full-duplex?
Radar
Telephone
Tolemetry
Local Area Network
In a circuit breaker, the time duration from the instant of the fault extinction of arc is known as
Operating time
total clearing time
Lag time
lead time
34.5 KV to 69 KV is classified as
Low voltage
Medium voltage
High voltage
Extra high vol
For an RL circuit, the power factor cannot be less than ______ or greater than
0,1
1,0
0, -1
-1, 0
is the overall energy program formulated and updated yearly by the DOE, submitted to the congress pursuant to RA 7638.
Philippine Energization Program
Philippine Energy Plan
Philippine Electrification Program
Philippine Electrification Plan
The lighting load for a dwelling expressed in terms of a unit load in volt ampere per square meter must be at least
24
12
16
2
The capacitors of power factor correction are rated in terms of
KV
KW
KVA
KVAR
What is the emf induced in a coil of 500 turns and with a constant flux of 108 maxwells?
0v
5v
50v
500v
In a balanced three phase wye connected circuit, the line voltage are equal
To the line current
To the phase voltage
and so are the line currents
but the line currents are unequal
In a given circuit when the power factor is unity the reactive power is
Maximum
equal to i2 r
zero
minimum
Joule found out that the heat produced in a current carrying conductor is proportional to
The square of the current
The current
the square of resistance
inversely proportional to time
In a wye connected system, line current is
0.707 times the phase current
1.735 times the phase current
equal to the phase current
1.414 the phase current
What is the device function number for overcurrent relay?
27
67
50
51
In a series RL circuit, the inductor current ________ the resistor current.
Tags
leads
is equal to
is greater than
he specific resistance p is defined as
Resistance of a conductor which has a length of 1m and cross section of 1 m squared at 2o Celsius
Resistance of any conductor at 25 celsius
Resistance of any conductor at 20 celsius
Resistance of a conductor which has a length of 1m and cros section of 1 cm squared at 20 celsius
A 15 ohm resistor connected in series with an inductor has an equivalent impedance of 30 ohms with an unknown angle. Find the power factor angle in degrees.
30
60
45
75
The master control center for a cellular telephone system in the
Cell site
Mobile telephone switching office
central office
branch office
The permeability of a material means
Strength of permanent magnet
Strength of an electromagnet
The magnetization left in the iron after exciting field has been removed
The conductivity of a material for magnetic lines of force
Is an instrument connected across the load?
Voltmeter
ammeter
ohmmeter
wattmeter
What will happen to the current of a transformer when the temperature of the transformers winding increases?
remains unchanged
increases
decreases
dramatically unchanged
The type of emf induced by neighboring coils.
Self- induced
dynamically induced
statically induced
mutually induced
Transformer are use to change the value of the following EXCEPT.
Alternating current
Alternating voltage
power
resistance
When a dc motor has no load, what will happen to the back emf?
Reduces
Increases
Becomes Maximum
Becomes Zero
A 4-way switch controls a lamp from _______ different locations.
1
2
3
4
When a V-V system is converted into Δ-Δ system, increase in the capacity of the system is _____ percent.
86.8
73.2
66.6
50
Converts energy of water to mechanical energy.
pump
turbine
generator
draft tube
A device that establishes an electrical connection to the earth
Grounding conductor
Grounded conductor
Grounding electrode
Grounding electrode conductor
Once residual magnetism of a shunt generator is lost, it may be restored by connecting its shunt field.
to earth
in reverse
to an external battery
to an alternator
In a parallel Rc circuit, as the capcitance decreases, the power factor
Increases
decreases
Remains the same
Becomes zero
The current flowing in the armature conductors of a dc motor is
ac
dc
ac as well as dc
Transients
