PHEP 34 Flashcards
The transfer of intelligence:
a) applies only to speech conveyance
b) does not apply to metering indication of control impulses
c) can be accomplished either by solid wire or through space
d) all above
c) can be accomplished either by solid wire or through space
An intraplant telephone circuit which is arranged so that either the transmitter or receiver can be switched from the circuit when not in use is called:
a) a simple series circuit
b) a series-parallel circuit
c) a push-to-talk arrangement
d) a phantom circuit
c) a push-to-talk arrangement
A carrier current
a) other
b) other
c) other
d) Is a radio frequency signal modulated by another signal modulated by another signal at an audio frequency rate, and thus carries the intelligence of the second signal.
d) Is a radio frequency signal modulated by another signal modulated by another signal at an audio frequency rate, and thus carries the intelligence of the second signal.
A device installed on carrier communication equipment which makes it possible for transmitter and receiver to operate continuously and without switching operations is called:
a) an audio hybrid unit
b) a calling unit
c) a blocking bias
d) an audio amplifier
a) an audio hybrid unit
Carrier frequencies
a) are limited only by the type and size of equipment in use
b) may range as high as 200kHz and ad low as 30kHz
c) are assigned a maximum and minimum of 150kHz to 50kHz, respectively
d) must be kept below audio frequencies range
b) may range as high as 200kHz and ad low as 30kHz
On the intermittent carrier system:
a) other
b) other
c) transmitted signals are used to prevent relays on unfaulted sections from tripping, while relays on the faulted section are tripped by not receiving signals
d) other
c) transmitted signals are used to present relays on unfaulted sections from tripping, while relays on the faulted section are tripped by not receiving signals
Carrier equipment is isolated and protected from the high voltage levels of power transmission conductors through the use of:
a) coupling capacitors
b fine tuning units
c) wave traps
d) line traps
a) coupling capacitors
A carrier relaying arrangement whereby signals are transmitted continuously and receivers are used to block the circuit breaker trip circuits is called:
a) an intermittent system
b) a duplex
c) a selective system
d) a continuous system
d) a continuous system
A carrier drain coil would be used with
a) coupling capacitor
b) wave trap
c) a cordless switchboard
d) all three
a) coupling capacitor
A wave trap would not be used to:
a) direct the carrier wave over a given circuit
b) increase impedance at the power frequencies
c) prevent absorption of the carrier wave by XFMR banks
d) prevent small external faults from shorting out carrier paths
b) increase impedance at the power frequencies
The line tuning unit in a carrier communication arrangement:
a) is connected in parallel with the coupling capacitor
b) provides adjustable inductance to compensate for reactance developed in coupling capacitors
c) serves to prevent the transfer of energy between 2 circuits
d) all three
b) provides adjustable inductance to compensate for reactance developed in coupling capacitors
When a carrier circuit is coupled to a single conductor of a three-phase power line to ground as the return path, the arrangement is called a line-to-ground coupling. all of the below statements dealing with this method of coupling are true except for:
a) this arrangement requires less coupling equipment
b) it is frequency used for short haul relaying applications
c) all line noise is eliminated
d) it may be used for both communication and telemetering channels
c) all line noise is eleminated
A method of coupling where the signal is coupled to the same phase of two circuits which provides for uninterrupted carrier is called:
a) interphase coupling
b) bus coupling
c) double circuit ground return coupling
d) inter-circuit coupling
c) double circuit ground return coupling
Where it is desired to couple the carrier signal to several transmission lines simultaneously at a given location, the type of coupling used is:
a) inter-circuit coupling
b) interphase coupling
c) double circuit coupling
d) bus coupling
d) bus coupling
VHF & UHF radio are both used as a communication channel:
a) for telemetering
b) for relay operation
c) for supervisory control
d) all three
d) all three
