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The size of a system has no effect on the process reaction rate
false
out of the four characteristics which one does not affect the performance of the controlled in the automatic controlled system?
distance
what controls the amount of water flowing past the point during an interval of time
rate of control
what are two types of electrical power devices that position final control elements
solenoid and electric motor
a controlled volume pump output is proportional to the square of its input speed
false
a better solution for mechanical reset for a device is to have it reset manually rather than automatically
false
which three is a mode of controlling
on/off
proportional plus reset,
proportional plus reset plus rate
monometer is a pressure gauge that responds to large pressure changes
false
a bell type gauge is
sensitive
accurate
stable
what is not a usual element filled temperature system
bi metal strip
what type electronic temperature sensor make use of voltage crated by joining two dissimilar metals
thermocouple
electric liquid level controllers can be used for
low and high level alarms,
discrete level indications,
operate pumps
velocity of slow equations
v=square root 2G*H
a choke provides fixed flow control
true
the electrical analog output of the tlc is like the transmitters output
2 to 20 milliamp signal
the rate at which the small plunger of the compensating dashpot returns to normal is usually determined by the setting of the
needle valve
the compensating dashpot serves to prevent over-travel or hunting of the gates by
re-centering the pilot valve
when using an ohm meter short the leads together and set the meter to read ___ while adjusting the zero adjustment knob.
zero ohms
power factor measures
the watts over volts ampers
in absents of a power factor meter power factor of a load can be determined by a
watt meter, amp meter, volt meter
thermocouple produces a flow of current when the junction is
heated
the speed in which the syncroscope indicator is rotating is affected by
Look up
the steel core of an acsr conductor does not
carry any appraisable load current
suspension type insulators have the ability to withstand
flash over, thermoshock, and mechanical impact
thyrite would most likely be used with
valve type lightning arresters
what is not an advantage of hvdc transmission lines
overall insolation requirement may be based on the peak rather than actual voltage
the control area =
one or more systems operating with metering and control facilities on all its ties to other systems outside the control area
the combine governor action and inertia of all generating units connected to a system is used to establish proper
frequency bias setting for that control area
incremental loading mainly refers to
the economical generation of electrical energy
the process where two systems not directly tied together may exchange electrically energy with each other through a third system to which they are mutually connected
wheel energy
most plant plans give bearings in terms of
north, feet
structural drawings show: framework, floors, and ____
foundations
supervisory control systems differ mainly from other classes of control systems
in the manner in which commands are transmitted and received
the reproduction at convenient location of measurement made at remote point is called
telemetering
in comparing the merit of analog telemetering with those of digital telemetering it would be correct to say
undetectable errors can be introduced at all points in an analog but only at the send end of a digital system
an intra plant telephone circuit when arranged so that either the transmitter or receiver can be switched from the circuit when not in use is called
push to talk arrangement
carrier current=
a radio frequency signal that is modulated by another signal at audio frequency rate and thus carries the intelligence of the second signal
a line trap =
parallel resonance circuit
for an oxygen breathing apparatus complete respiratory protection is provided for a minimum of
45 minutes
for co2 extinguishers the approx. duration of discharge is
20lbs 45 sec
dry chemical extinguishers consist of a powder composed of
highly refined soda
accidents with small hand tools such as wrenches that slip are
another major source of injuries
direct current is electric current that flows
one direction
how is ohm meter different from and ammeter and volt meter
it has its own power and axillary control circuit
what powers the flay ball
pmg permeant magnet generator
what controls and maintains the wicket gates as it opens to allow the generator to get up to main speed
gate limit device
a watt meter reads
volt-current
what is not Boolean algebra
notit
