E4E Component mounting techniques
(i.e., surface, dead bug {raised},
circuit board); direction finding: techniques and equipment; fox
hunting
E4E01
(D)
What
circuit construction technique uses leadless components mounted between circuit
board pads?
A. Raised mounting
B. Integrated circuit mounting
C. Hybrid device mounting
D. Surface mounting
E4E02
(A)
What is
the main drawback of a wire-loop antenna for direction finding?
A. It has a bidirectional
pattern broadside to the loop
B. It is non-rotatable
C. It receives equally well in all directions
D. It is practical for use only on VHF bands
E4E03
(B)
What
pattern is desirable for a direction-finding antenna?
A. One which is non-cardioid
B. One with good
front-to-back and front-to-side ratios
C. One with good top-to-bottom and side-to-side
ratios
D. One with shallow nulls
E4E04
(C)
What is
the triangulation method of direction finding?
A. The geometric angle of ground waves and sky
waves from the signal source are used to locate the source
B. A fixed receiving station plots three beam
headings from the signal source on a map
C. Beam headings from
several receiving stations are used to plot the signal source on a map
D. A fixed receiving station uses three
different antennas to plot the location of the signal source
E4E05
(D)
Why is
an RF attenuator desirable in a receiver used for direction finding?
A. It narrows the bandwidth of the received
signal
B. It eliminates the effects of isotropic
radiation
C. It reduces loss of received signals caused
by antenna pattern nulls
D. It prevents receiver
overload from extremely strong signals
E4E06
(A)
What is
a sense antenna?
A. A vertical antenna added
to a loop antenna to produce a cardioid reception pattern
B. A horizontal antenna added to a loop antenna
to produce a cardioid reception pattern
C. A vertical antenna added to an Adcock
antenna to produce a omnidirectional reception pattern
D. A horizontal antenna added to an Adcock
antenna to produce a omnidirectional reception pattern
E4E07
(D)
What
type of antenna is most useful for sky-wave reception in radio direction
finding?
A. A log-periodic dipole array
B. An isotropic antenna
C. A circularly-polarized antenna
D. An Adcock antenna
E4E08
(C)
What is
a loop antenna?
A. A large circularly-polarized antenna
B. A small coil of wire tightly wound around a
toroidal ferrite core
C. Several turns of wire
wound in the shape of a large open coil
D. Any antenna coupled to a feed line through
an inductive loop of wire
E4E09
(D)
How can
the output voltage of a loop antenna be increased?
A. By reducing the permeability of the loop
shield
B. By increasing the number of wire turns in
the loop and reducing the area of the loop structure
C. By reducing either the number of wire turns
in the loop or the area of the loop structure
D. By increasing either the
number of wire turns in the loop or the area of the loop structure
E4E10
(B)
Why is
an antenna system with a cardioid pattern desirable for a direction-finding
system?
A. The broad-side responses of the cardioid
pattern can be aimed at the desired station
B. The deep null of the
cardioid pattern can pinpoint the direction of the desired station
C. The sharp peak response of the cardioid
pattern can pinpoint the direction of the desired station
D. The high-radiation angle of the cardioid
pattern is useful for short-distance direction finding
E4E11
(C)
What
type of terrain can cause errors in direction finding?
A. Homogeneous terrain
B. Smooth grassy terrain
C. Varied terrain
D. Terrain with no buildings or mountains
E4E12
(A)
What is
the activity known as fox hunting?
A. Amateurs using receivers
and direction-finding techniques attempt to locate a hidden transmitter
B. Amateurs using transmitting equipment and direction-finding
techniques attempt to locate a hidden receiver
C. Amateurs helping the government track
radio-transmitter collars attached to animals
D. Amateurs assemble stations using generators
and portable antennas to test their emergency communications skills