JACI PRIMER EXAM ACTUAL EXAM 120 QUESTIONS
AND CORRECT DETAILED ANSWERS WITH RATIONALES
(100% VERIFIED ANSWERS) |ALREADY GRADED A+||
BRAND NEW!!!
What connects your transceiver to your antenna?
A A ground wire
B A dummy load
C A transmission line
D The power cord - ANSWER: C
The characteristic impedance of a transmission line is determined by the:
A load placed on the line
B physical dimensions and relative positions of the conductors
C length of the line
D frequency at which the line is operated - ANSWER: B
The characteristic impedance of a 20 metre piece of transmission line is 52 ohms. If
10 metres were cut off, the impedance would be:
A 26 ohms
B 39 ohms
C 13 ohms
D 52 ohms - ANSWER: D
The characteristic impedance of a coaxial line:
A can be the same for different diameter line
B changes significantly with the frequency of the energy it carries
C is correct for only one size of line
D is greater for larger diameter line - ANSWER: A
What commonly available antenna transmission line can be buried directly in the
ground for some distance without adverse effects?
A 75 ohm twin-lead
B Coaxial cable
C 300 ohm twin-lead
D 600 ohm open-wire line - ANSWER: B
The characteristic impedance of a transmission line is:
A the dynamic impedance of the line at the operating frequency
, B the ratio of the power supplied to the line to the power delivered to the load
C equal to the pure resistance which, if connected to the end of the line, will absorb
all the power arriving along it
D the impedance of a section of the line one wavelength long - ANSWER: C
The characteristic impedance of a parallel wire transmission line does not depend on
the:
A dielectric
B velocity of energy on the line
C radius of the conductors
D centre to centre distance between conductors - ANSWER: B
If the impedance terminating a transmission line differs significantly from the
characteristic impedance of the line, what will be observed at the input of the line?
A A negative impedance
B An impedance nearly equal to the characteristic impedance
C Some value of impedance influenced by line length
D An infinite impedance - ANSWER: C
TV twin-lead transmission line can be used for a transmission line in an amateur
station. The impedance of this line is approximately:
A 300 ohms
B 600 ohms
C 50 ohms
D 70 ohms - ANSWER: A
What is a coaxial cable?
A A center wire inside an insulating material which is covered by a metal sleeve or
shield
B Two wires side-by-side in a plastic ribbon
C Two wires side-by-side held apart by insulating rods
D Two wires twisted around each other in a spiral - ANSWER: A
What factors determine the characteristic impedance of a coaxial antenna
transmission line?
A The frequency of the signal and the length of the line
B The ratio of the diameter of the inner conductor to the diameter of the outer
shield
C The diameter of the shield and the length of the line
D The diameter of the shield and the frequency of the signal - ANSWER: B
What is an unbalanced line?
AND CORRECT DETAILED ANSWERS WITH RATIONALES
(100% VERIFIED ANSWERS) |ALREADY GRADED A+||
BRAND NEW!!!
What connects your transceiver to your antenna?
A A ground wire
B A dummy load
C A transmission line
D The power cord - ANSWER: C
The characteristic impedance of a transmission line is determined by the:
A load placed on the line
B physical dimensions and relative positions of the conductors
C length of the line
D frequency at which the line is operated - ANSWER: B
The characteristic impedance of a 20 metre piece of transmission line is 52 ohms. If
10 metres were cut off, the impedance would be:
A 26 ohms
B 39 ohms
C 13 ohms
D 52 ohms - ANSWER: D
The characteristic impedance of a coaxial line:
A can be the same for different diameter line
B changes significantly with the frequency of the energy it carries
C is correct for only one size of line
D is greater for larger diameter line - ANSWER: A
What commonly available antenna transmission line can be buried directly in the
ground for some distance without adverse effects?
A 75 ohm twin-lead
B Coaxial cable
C 300 ohm twin-lead
D 600 ohm open-wire line - ANSWER: B
The characteristic impedance of a transmission line is:
A the dynamic impedance of the line at the operating frequency
, B the ratio of the power supplied to the line to the power delivered to the load
C equal to the pure resistance which, if connected to the end of the line, will absorb
all the power arriving along it
D the impedance of a section of the line one wavelength long - ANSWER: C
The characteristic impedance of a parallel wire transmission line does not depend on
the:
A dielectric
B velocity of energy on the line
C radius of the conductors
D centre to centre distance between conductors - ANSWER: B
If the impedance terminating a transmission line differs significantly from the
characteristic impedance of the line, what will be observed at the input of the line?
A A negative impedance
B An impedance nearly equal to the characteristic impedance
C Some value of impedance influenced by line length
D An infinite impedance - ANSWER: C
TV twin-lead transmission line can be used for a transmission line in an amateur
station. The impedance of this line is approximately:
A 300 ohms
B 600 ohms
C 50 ohms
D 70 ohms - ANSWER: A
What is a coaxial cable?
A A center wire inside an insulating material which is covered by a metal sleeve or
shield
B Two wires side-by-side in a plastic ribbon
C Two wires side-by-side held apart by insulating rods
D Two wires twisted around each other in a spiral - ANSWER: A
What factors determine the characteristic impedance of a coaxial antenna
transmission line?
A The frequency of the signal and the length of the line
B The ratio of the diameter of the inner conductor to the diameter of the outer
shield
C The diameter of the shield and the length of the line
D The diameter of the shield and the frequency of the signal - ANSWER: B
What is an unbalanced line?
