EX. Mod. 11 ch.3 & Mod. 13, 15

Power ratio is a term used to express
what property of an antenna?

A standing-wave ratio (swr) describes
which of the following quantities?

Directivity refers to which of the
following properties of a radiated beam?

Surface angular measurements for
antenna directivity in radar and
communications systems are made in
relationship to which of the following
references?

Radar range is determined as a function
of which of the following measures?

The parabolic reflector is often used
because it produces a radiation pattern
with which of the following antenna
characteristics?

In a lens antenna, what is the purpose of
the collimating lens?

A lens antenna which accelerates some
portion of the wavefronts so that all
wavefronts exit the lens at the same timeis referred to as the

In a delay-type lens, the amount of delay
in the phase of the wave passing through
the lens is determined by which of the
following characteristics?

What is/are the basic type(s) of antenna
array(s) in common use?

In a frequency-sensitive antenna, the
physical length of the serpentine section
and its relationship to the wavelength of
the applied energy determines which of
the following characteristics?

In a horizontal-slot antenna, the
polarization of the energy is radiated in
what direction?

Modern number systems are built around
which of the following components?

What term describes a single object in a
modern number system?

What is a number?

What term describes the number of
symbols used in a number system?

What is the base of a number system
using all the letters of the
alphabet A=0, B=1, C=2, and so forth?

A number system uses the symbols 0
through 4. What is its base?

Using positional notation, what two
factors determine the value of a number?

The power of a number is indicated by the

What is the value of 5 times 100?

What term describes the symbol that
separates the whole and fractional
numbers in any number system?

What term is defined as a number to be
added to a preceding number?

In subtraction, the (a) is subtracted from
the (b).

The result of subtraction is known as the

Which of the following terms accurately describes a synchro?

What are the two general classifications
of synchro systems?

What is the difference in application
between the two classifications of
synchros?

Which of the following types of synchro
devices provides a mechanical output?

A 115-volt, 400-Hz torque transmitter
with a diameter of 2.36 inches will have
what military standard designation code?

A 3.5-inch diameter differential receiver
will have what Navy prestandard
designation code?

What does the arrow on a synchro schematic symbol indicate?

What are the two major components of a
synchro?

What type of rotor can be composed of a
single winding or three Y-connected windings?

How does the stator of a TX receive
voltage?

What part of a synchro provides a point
for external connections?

Which of the following terms is defined
as the amount of load a machine can
turn?

Which of the following units should be
used in measuring the amount of turning
force of a synchro?

An overloaded synchro will probably
exhibit which of the following conditions?

A synchro receiver has which of the following characteristics that is NOT found in an ordinary transformer?

Damping is necessary for which of the
following synchro devices?

The primary purpose of damping is to reduce which of the following conditions in a synchro device?

In a simple synchro system, what leads are connected to the source voltage?

When a synchro transmitter, and receiver are in correspondence, what is the relative value of the (a) current through the stators and (b) receiver torque?

What term applies to the angle through which a synchro transmitter rotor is rotated mechanically?

If a synchro receiver is required to rotate in a direction opposite to the rotation of the transmitter rotor, what leads should be reversed?

If a synchro receiver and transmitter are always 180 degrees out of phase with each other, what leads are reversed?

What type of synchro can accept two signals simultaneously and add or subtract?

What are the two types of synchro devices that will accept two inputs?

What types of synchro devices have (a) one electrical and one mechanical input and an electrical output; and (b) two electrical inputs and a mechanicaloutputs?

What determines whether a differential synchro device adds or subtracts its inputs?

In a TDX system, for the TR rotor to follow the TX rotor exactly, in what position must the TDX rotor be kept?

For a TDX system to add its inputs rather than subtract them, what leads must be reversed between (a) the TX and TDX, and (b) the TR and TDX?

For a TDR system to add its inputs rather than subtract them, what leads must be reversed at the TDR?

If a TDR system is connected for addition and the TX rotor connected to the TDR rotor turns counterclockwise, in what direction will the TDR rotor field rotate?

Which of the following types of synchros is used in a system requiring large amounts of power and high accuracy?

What are the three types of control synchros?

The CX and CDX differ from the TX and TDX because the CX and CDX have which of the following characteristics?

What is NOT a characteristic of the rotor of a control transformer (CT) rotor?

When a control transformer is at electrical zero, the rotor is perpendicular to what winding?

Which of the following terms applies to the output of a control transformer?

If the output of a control transformer is zero, what is the relationship of the rotors of the control transformer and the control transmitters?

Synchro capacitors are used to provide which of the following characteristics in a synchro system?

What synchro devices uses a synchro capacitor?

What type of current is eliminated by synchro capacitors?

To maintain system accuracy, where are synchro capacitors physically placed in a synchro circuit?

Synchro systems that transmit data at two
different speeds are referred to by which of the following terms?

Multispeed synchro systems have which
of the following advantages over singlespeed
synchro systems?

What does the gear ratio between the two transmitters in a dual-speed synchro system determine?

Which of the following synchro systems, if any, should be used to transmit very large quantities?

Which of the following is a disadvantage of a double receiver as compared to two single receivers?

The voltage used to prevent false synchronizations is known by what term?

What is the reference point for the alignment of all synchro units?

What is the most accurate method of aligning a synchro?

During synchro alignment, what is the purpose of the coarse setting?

If a synchro receiver is properly zeroed, when do the stator windings have electrical zero voltages?

When a 115-volt synchro transmitter is
set on its coarse-zero position, approximately what voltage should be read on a voltmeter?

When a 115-volt source is used during the alignment of a differential synchro, what is the maximum time the circuit can be energized without causing damage to the synchro?

After a control transformer has been zeroed and clamped down, what is the final step in the zeroing procedure?

The output voltage of a control transformer on electrical zero is which of the following relative values?

When a tri-speed synchro system is being zeroed, which synchro should be zeroed first?

What method of zeroing a synchro is the fastest but NOT the most accurate?

The electrical-lock method of zeroing a synchro requires accessible leads and which of the following conditions?

A synchro is zeroed by the use of a synchro tester. After it is zeroed, the S1 and S3 leads are shorted together, and the synchro tester dial moves. What does this indicate?

If you find that a synchro has bad bearings, which of the following actions should you take?

Which of the following troubles is common in newly installed synchro systems?

What type of indicating device is usually installed in the stator circuit of a torque synchro system?

A synchro system with four receivers is malfunctioning. All of the receivers have incorrect readings. Which of the following is/are the most likely cause(s) of the trouble?

An ac voltmeter is connected between windings S1 and S3 of a synchro transmitter. Which of the following rotor positions should give a zero voltage reading?

When a synchro tester is used in place of a synchro transmitter, which of the following precautions will help to keep the tester from being overloaded?