4
1-26. If a 28 volt 6 ampere fuse blows, the
proper procedure is to replace it with
which of the following devices?
1. A larger fuse until the cause of the
overload has been determined
2. A fuse of the same voltage and
current rating
3. A fuse rated 20 percent lower than the
blown fuse
4. A copper strap until the cause of the
overload is determined
1-27. Before electrical equipment is
overhauled or repaired, what general
safety precaution, if any, should be
followed?
1. The fuse for the associated circuits
should be replaced with circuit
breakers
2. The main supply switches should
temporarily be shorted out
3. The power switches should be
secured open and tagged out of
service
4. None
1-28. After work on equipment is complete,
who should remove any attached tags?
1. The job inspector
2. The repair crew leader
3. Any member of the repair crew
4. The person who signed and attached
the tag
1-29. What is the purpose of the grounding
cable attached to the frame of a generator
aboard ship?
1. Create a potential difference between
the frame and the ship
2. Conduct power to the generator under
emergency conditions
3. Ensure equipment is at same ground
potential as the ship
4. Break the circuit between the frame
and the power supply under
emergency conditions
1-30. Which of the following steps should you
take to help ensure that metal-case test
equipments are safe to use?
1. Energize the instrument to test the
ground
2. Ensure the equipment is grounded
3. Insulate the metal case from ground
4. Connect all metal cases to a common
ungrounded lead
1-31. Which of the following precautions
should you observe when using
measuring instruments?
1. Avoid strong magnetic fields
2. Avoid excessive current
3. Avoid mechanical shock
4. Each of the above
1-32. The meter movement in a voltmeter can
be easily damaged by excessive current if
you do not follow certain procedures.
When setting up the meter to read
voltage, the RANGE SWITCH should
first be set to (a) what relative range and
then changed to (b) what relative range?
1. (a) Highest
(b) Closest to the voltage to be read
2. (a) Highest
(b) Lower than the voltage to be read
3. (a) Lowest
(b) Lower than the voltage to be read
4. (a) Lowest
(b) Closest to the voltage to be read
