PHEP_34B

Question 1

A telephone transmitter converts sound waves into:

a) electric current variations
b) capacitive amperes
c) inductive amperes
d) Morris code

Answer 1

a) electric current variations ref: p. 3

Question 2

It is sometimes necessary to transpose both telephone lines and power lines inorder to:

a) prevent excessive power
b) prevent power line harmonics from interferring with voice frequencies
c) prevent high voltage
d) all of the above

Answer 2

b) prevent power line harmonics from interferring with voice frequencies ref: p. 7 & 8

Question 3

A paralle telephone circuit, arranged so that either the transmitter or the receiver can be removed from the circuit when not being used is called:

a) telephone trans-communication
b) an audio hybrid system
c) a wave trap
d) a push to talk arrangement

Answer 3

d) a push to talk arrangement Ref: p. 4

Question 4

Relative low energy signals superimposed on power transmission conductors as a means of communication is called:

a) line of site communication
b) carrier current
c) wave trap
d) voice frequency

Answer 4

b) carrier current ref: p. 8

Question 5

A device which serves to protect carrier equipment from high voltage levels of power transmission conductors is called:

a) coupling capacitor
b) simplex control
c) microwave
d) all of the above

Answer 5

a) coupling capacitor ref: p. 17

Question 6

A device used with carrier current equipment to confine the signal to the desired circuit is called a:

a) audio hybrid unit
b) coupling capacitor
c) microwave
d) wave trap

Answer 6

d) wave trap ref: p. 18

Question 7

Functions which can be performed by using carrier as a means for transmitting signals are:

a) relaying
b) telemetering
c) voice communication
d) all of the above

Answer 7

d) all of the above ref: p. 25

Question 8

Carrier frequencies range from as high as:

a) 600 Hertz to a low of 15 Hertz
b) 600 Hertz to a low of 30 Hertz
c) 200 Hertz to a low of 30 Hertz
d) 100 Hertz to a low of 15 Hertz

Answer 8

c) 200 Hertz to a low of 30 Hertz ref: p. 9

Question 9

A design of a power-line carrier communication system which provides for a two-way conversation without switching operations is called a:

a) duplex system
b) ausio hybrid system
c) microwave system
d) line tuning unit

Answer 9

‘a) duplex system ref: p. 10

Question 10

Microwave transmission requires:

a) line of site transmission
b) low frequencies be used
c) a power line carrier
d) inductive coupling

Answer 10

a) line of site transmission ref: p. 21

Question 11

An audio hybrid unit:

a) line of site used with a simplex system
b) reduces amount of receiver output which reaches audio amplifier
c) is part of a line turning unit
d) all of the above

Answer 11

b) reduces amount of receiver output which reaches audio amplifier ref: p. 17

Question 12

It is possible to reduce or eleminate interferences in telephone lines by:

a) seperating the telephone
b) transposing power lines
c) minimizing harmonic
d) all of the above

Answer 12

d) all of the above ref: p. 7-8

Question 13

The method or methods or systems for establishing a call over a carrier channel is:

a) code bell calling
b) voice calling
c) dial selective calling
d) all of the above

Answer 13

d) all of the above ref: p. 13

Question 14

A line trap is:

a) a parallel resonant circuit
b) part of a tuned arrester
c) a drain coil
d) a choke coil

Answer 14

a) a parallel resonant circuit ref: p. 19

Question 15

The purpose of a drain coil:

a) is to ground the capacitor terminal opposite the line terminal at 60 Hertz
b) drain the wave trap
c) drain the choke coil
d) all of the above

Answer 15

a) is to ground the capacitor terminal opposite the line terminal at 60 Hertz ref: p. 18