ISCET Final Exam Questions and Graded Answers, 100 % Guaranteed
To install and maintain a RADAR, you must have: - ✔✔GROL w/ Radar or GMDSSIM w/ Radar
Who may replace fuses and receiving type tubes and circuits in a Radar? - ✔✔Holder of
GROL w/ Radar
Under what circumstances can an unlicensed person operate a radar set? - ✔✔Only if the Tx
is a non-tenable type and when the master of the ship designated him to operate it
What Radar maintenance work may be done by unlicensed workers? - ✔✔None
Who is permitted to operate a ship, Radar? - ✔✔Master of the ship, or anyone designated
by the master.
What is box 46 of EL8-A? - ✔✔TR Box
What is box 47 of EL8-A? - ✔✔RF Attenuator
What is box 48 of EL8-A? - ✔✔Klystron
What is box 49 of EL8-A? - ✔✔Crystal Detector
What is box 50 of EL8-A? - ✔✔Discriminator
The minimum range of a Radar is primarily determined by: - ✔✔The pulse width and TR
(TRL) cell recovery time
An RF mixer has what purpose in a Radar system? - ✔✔It converts low-level signal to a
different frequency
,The switching devices most commonly used in pulse networks, and pulse transformers
are/is: - ✔✔SCR's and Thyratrons
Good bearing resolution largely depends upon: - ✔✔A narrow antenna beam in the
horizontal plane
Bearing Resolution is: - ✔✔The ability to distinguish two adjacent targets of equal distance.
An artificial line is used for: - ✔✔Determining the shape and durations of the pulses
What device is located between the magnetron and the mixer and prevents received signals
from entering the magnetron? - ✔✔The ATR box
The ATR Box: - ✔✔Prevents the received signal from entering the transmitter
When a pulse radar is radiating, which elements in the TR box are energized? - ✔✔The TR
and ATR tubes
In the AFC system, the discriminator compares the frequencies of the: - ✔✔Magnetron and
Klystron
The purpose of the discriminator circuit in a Radar is to: - ✔✔Generate a corrective voltage
for controlling the frequency of the klystron local oscillator
Where is the RF Attenuator used in a Radar? - ✔✔Between the Magnetron and AFC section
of the receiver
What frequency is the discriminator tuned to? - ✔✔30 MHz IF
, The usual intermediate frequency of a shipboard Radar unit is: - ✔✔30 or 60 MHz
The error voltage from the discriminator us applied to: - ✔✔The Repeller (reflector) of the
klystron
How may the frequency of the klystron be varied? - ✔✔Small changes can be made by
adjusting the Repeller voltage and large changes can be made by adjusting the size of the
resonant cavity
Fine adjustment of the reflex klystron is accomplished by: - ✔✔Varying the Repeller voltage
The pulse repetition rate (PRR) refers to: - ✔✔The pulse rate of the magnetron
The timer circuit: - ✔✔Determines the PRR, determines range markers, and provides
blanking and unblinking signals for the CRT
On what frequency is radar expected to cause interference? - ✔✔On most any
communication frequency
If the magnetron is allowed to operate without the magnetic field in place: - ✔✔It will
quickly destroy itself from excessive current flow
What radar circuit determines the pulse repetition rate (PRR)? - ✔✔The timer (synchronizer
circuit)
Range markers are determined by: - ✔✔The timer
Unblinking pulses are produced by the timer circuit. Where are they sent? - ✔✔To the CRT
To install and maintain a RADAR, you must have: - ✔✔GROL w/ Radar or GMDSSIM w/ Radar
Who may replace fuses and receiving type tubes and circuits in a Radar? - ✔✔Holder of
GROL w/ Radar
Under what circumstances can an unlicensed person operate a radar set? - ✔✔Only if the Tx
is a non-tenable type and when the master of the ship designated him to operate it
What Radar maintenance work may be done by unlicensed workers? - ✔✔None
Who is permitted to operate a ship, Radar? - ✔✔Master of the ship, or anyone designated
by the master.
What is box 46 of EL8-A? - ✔✔TR Box
What is box 47 of EL8-A? - ✔✔RF Attenuator
What is box 48 of EL8-A? - ✔✔Klystron
What is box 49 of EL8-A? - ✔✔Crystal Detector
What is box 50 of EL8-A? - ✔✔Discriminator
The minimum range of a Radar is primarily determined by: - ✔✔The pulse width and TR
(TRL) cell recovery time
An RF mixer has what purpose in a Radar system? - ✔✔It converts low-level signal to a
different frequency
,The switching devices most commonly used in pulse networks, and pulse transformers
are/is: - ✔✔SCR's and Thyratrons
Good bearing resolution largely depends upon: - ✔✔A narrow antenna beam in the
horizontal plane
Bearing Resolution is: - ✔✔The ability to distinguish two adjacent targets of equal distance.
An artificial line is used for: - ✔✔Determining the shape and durations of the pulses
What device is located between the magnetron and the mixer and prevents received signals
from entering the magnetron? - ✔✔The ATR box
The ATR Box: - ✔✔Prevents the received signal from entering the transmitter
When a pulse radar is radiating, which elements in the TR box are energized? - ✔✔The TR
and ATR tubes
In the AFC system, the discriminator compares the frequencies of the: - ✔✔Magnetron and
Klystron
The purpose of the discriminator circuit in a Radar is to: - ✔✔Generate a corrective voltage
for controlling the frequency of the klystron local oscillator
Where is the RF Attenuator used in a Radar? - ✔✔Between the Magnetron and AFC section
of the receiver
What frequency is the discriminator tuned to? - ✔✔30 MHz IF
, The usual intermediate frequency of a shipboard Radar unit is: - ✔✔30 or 60 MHz
The error voltage from the discriminator us applied to: - ✔✔The Repeller (reflector) of the
klystron
How may the frequency of the klystron be varied? - ✔✔Small changes can be made by
adjusting the Repeller voltage and large changes can be made by adjusting the size of the
resonant cavity
Fine adjustment of the reflex klystron is accomplished by: - ✔✔Varying the Repeller voltage
The pulse repetition rate (PRR) refers to: - ✔✔The pulse rate of the magnetron
The timer circuit: - ✔✔Determines the PRR, determines range markers, and provides
blanking and unblinking signals for the CRT
On what frequency is radar expected to cause interference? - ✔✔On most any
communication frequency
If the magnetron is allowed to operate without the magnetic field in place: - ✔✔It will
quickly destroy itself from excessive current flow
What radar circuit determines the pulse repetition rate (PRR)? - ✔✔The timer (synchronizer
circuit)
Range markers are determined by: - ✔✔The timer
Unblinking pulses are produced by the timer circuit. Where are they sent? - ✔✔To the CRT
