Pre-Boards EE 1 Flashcards
If the torque angle continuously increases, system will become…
unstable
A type of communication that uses light rather than electricity to communicate is called?
fiber optic
Grounding allows _____ opposition path of current flow.
low
A space station with communication equipment that synchronizes with the earth’s orbit.
satellite
The dc armature winding in which the coil sides are placed a pole pitch apart is called?
full-pitch
What is the maximum number of bends permitted in rigid conduits between outlets?
4 quarter bends
When the length of wire is doubled and all other factors remained the same, what would the wire resistance become?
doubled
Three phase short circuit current of an alternator will be…
zero
In two terminal pair of network of a transmission line can be represented by a? (2)
Nominal Pi
Nominal T
By increasing the transmission voltage double its original value, the same power can be dispatched keeping the line loss…
one-fourth of the original value
The curve representing Ohm’s law is?
linear
What is PEMC in EPIRA stands for?
Philippine Electricity Market Corporation
Insulator selected for high voltage application
Suspension type
The Buchholz relay is used to protect the?
oil immersed transformers against all internal faults
What is the device number function number of overcurrent relay?
51
Breather mounted on transformer tank contains?
calcium
87 is the device function number assigned by ANSI to this relay.
differential relay
Iteration method that is fastest to converge.
Newton raphson
The material commonly used for insulation in high voltage cables is?
paper
Copper loss of a transformer are determined by means of a/an _____test.
short circuit
In the left hand rule, thumb always represent direction of the _____.
force on conductor
Which of the following cannot have a single unit of 100MW?
Diesel Power Plant
A standard candle emits a total of luminous flux of _____ lumens.
12.57 or 4pi
Synchronous motors are _____.
not self starting
AC system has the following disadvantages over DC system except?
charging current exists
Parameter that can be neglected for a short line?
capacitance
Power plant that will take least time in starting from cold condition to full load condition
Hydro Power Plant
A type of communication channel that sends information in one direction only.
simplex
The power generated by some steam power plants drips in the summer because?
the lake temperature increases
In which type of electronic communications does the information travel in two directions?
full duplex
What is/are the main reason’s for using high voltage in the transmission of power in the grid system?
I. to transmit bulk power with minimum line losses
II. increase system reliability
I only
What is NOT a property of magnetic field lines?
The lines cross themselves only at right angles
What has the lesser work to but many iterations?
gauss-seidel
What is the device function number of a directional power relay?
32
The power transmission capacity of the transmission line is…
proportional to the square of the voltage
Open circuit test on transformers is conducted to determine…
core loss
Impurities in an electrolyte can cause an internal short circuit condition called?
local action
If the field of a dc shunt motor is opened…
the speed of the motor will become very high
Effect that is generally less for an alternating current than for a direct current.
Chemical effects
What is the type of relay that is intended to respond to the difference between incoming and outgoing electrical quantities?
differential
Power plant having the maximum efficiency.
Hydro
A type of approximation that has a lot of work to do but it will converge fast.
Newton raphson
In case of delta connected circuit, when one resistor is open, power will be?
reduced by 1/3
In the transformers…
high tension winding is used near the core
What should be included in the calculation of the reliability standard indices of the distributor asset by the Philippine Distribution Code?
Outages that occur on the primary lines of the distribution system.
What is the normal secondary circuit current of a current transformer?
5 A
A conductor has four identical strands arranged in diamond configuration. Find the GMR of the conductor in terms of the radius r of each strand.
1.6921r
