1s051 Volume III Pretest (For Reference Use Only)

100 Questions | By Kahlbanor | Updated: Mar 20, 2022 | Attempts: 92

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USAF Safety Journeyman Volume III Pretest (FOR REFERENCE USE ONLY)

Questions and Answers

1.

(401) The flow of electricity may be compared to
- A.
  
  A streak of lightning.
- B.
  
  Water running through a pipe.
- C.
  
  Water passing through the ground.
- D.
  
  Lightning passing through the ground.
2.

(401) What unit of measurement is used to measure electrical current?
- A.
  
  Volts.
- B.
  
  Ohms.
- C.
  
  Amperes.
- D.
  
  Coulombs.
3.

(401) How is electrical current measured when you want to describe its effect on the human body?
- A.
  
  Ohms.
- B.
  
  Amperes.
- C.
  
  Resistance.
- D.
  
  Milliamperes.
4.

(401) Resistance is any condition that
- A.
  
  Opposes or restricts the flow of electricity.
- B.
  
  Increases the voltage of electrical flow.
- C.
  
  Aids the conduction of electricity.
- D.
  
  Keeps a circuit closed.
5.

(402) An electrical outlet must be protected by a ground fault circuit interrupter (GFCI) when it is located within how many feet of a sink?
- A.
  
  6.
- B.
  
  8.
- C.
  
  10.
- D.
  
  12.
6.

(402) Which safety rule should be observed where extension cords are used?
- A.
  
  Extension cords should be taped to a wall instead of lying on the floor.
- B.
  
  A long extension cord should be coiled.
- C.
  
  Extension cords must not be run through ceiling holes.
- D.
  
  Extension cords should not be used for small appliances.
7.

(402) Who is responsible for helping supervisors mark all circuit breaker boxes with the correct voltage?
- A.
  
  Shop personnel.
- B.
  
  Ground safety personnel.
- C.
  
  Civil engineering personnel.
- D.
  
  Circuit breaker box manufacturer.
8.

(403) What type of electrical cell can be restored to a charged condition by passing an electrical current through the cell in the opposite direction of the discharging current?
- A.
  
  Primary cell.
- B.
  
  Storage cell.
- C.
  
  Electrode cell.
- D.
  
  Negative electrode cell.
9.

(403) When electrical pressure is generated by chemical action, the device in which this occurs is called
- A.
  
  A neutronic cell.
- B.
  
  An electrical cell.
- C.
  
  A chemical cell.
- D.
  
  A lead cell.
10.

(403) An electrical cell consists of
- A.
  
  A negative electrode, electrolyte, and a circuit.
- B.
  
  Positive and negative poles, and a potential circuit.
- C.
  
  A positive electrode, negative electrode, and an electrolyte.
- D.
  
  An electrolyte compound, a circuit continuity, and an electrical charge.
11.

(403) In battery shop operations, how should sulfuric acid and water be mixed together?
- A.
  
  Pour water slowly into acid.
- B.
  
  Pour acid slowly into water.
- C.
  
  Combine in a metal container.
- D.
  
  Combine with a diluting agent.
12.

(403) Where can you find the standard for Air Force electrical systems and operations?
- A.
  
  Major command (MAJCOM) USAF directives.
- B.
  
  National Electric Code (NEC).
- C.
  
  Department of Defense (DOD) Electrical Systems Instruction.
- D.
  
  USAF Fire Prevention Code.
13.

(404) One complete cycle of alternating current (AC) is composed of
- A.
  
  One alternation of current.
- B.
  
  One negative pulse of current.
- C.
  
  Two alternations of current (both in the same direction).
- D.
  
  Two alternations of current (one in one direction and one in the other).
14.

(404) Which device is used to change power from one voltage to another?
- A.
  
  Transformers.
- B.
  
  Capacitors
- C.
  
  Rectifiers.
- D.
  
  Filters.
15.

(405) The primary factor influencing the severity of electrical shock to the human body is the
- A.
  
  Length of the exposure.
- B.
  
  Amount of the current flow.
- C.
  
  Level of the voltage applied.
- D.
  
  Frequency of the electrical charge.
16.

(405) How much current causes a normally harmless shock to be felt?
- A.
  
  1 milliampere.
- B.
  
  25 milliamperes.
- C.
  
  1 ampere.
- D.
  
  25 ampere.
17.

(406) What is the purpose of placing bonding wire between two metal objects?
- A.
  
  Continuity of system grounds.
- B.
  
  Equalization of static charges that may be generated.
- C.
  
  Dissipation of static electrical charges to a ground.
- D.
  
  Prevention of accumulations of dynamic electricity.
18.

(406) Grounding is used to control
- A.
  
  Static electrical charges only.
- B.
  
  Dynamic electrical charges only.
- C.
  
  Both dynamic and static electrical charges.
- D.
  
  Bonded equipment.
19.

(406) An example of a system ground is a
- A.
  
  Three-prong adapter.
- B.
  
  Double-insulated tool.
- C.
  
  Return wire attached to a ground in the earth.
- D.
  
  Wire attached to the frame of a tool and a metal bar.
20.

(406) Grounding is effective when
- A.
  
  There are no breaks in the grounding path.
- B.
  
  The grounding path is broken before it reaches the ground.
- C.
  
  Dynamic charges are converted into static charges.
- D.
  
  Static charges are converted into to dynamic charges.
21.

(406) It is hard to maintain an effective ground for portable electric equipment because
- A.
  
  The equipment is relatively small in size.
- B.
  
  The equipment is moved about so much.
- C.
  
  The equipment uses a three-wire cord.
- D.
  
  The grounding prong on the plug has probably been removed.
22.

(406) Which of the following is not a specific characteristic of effective grounds?
- A.
  
  All paths must be continuous.
- B.
  
  Equipment grounds should never exceed two ohms.
- C.
  
  All grounding points must be provided adequate protection against physical damage.
- D.
  
  The natural ground circuit resistance should be kept as far as possible below the maximum permissible limits.
23.

(407) Which device is the simplest way to control an electrical circuit?
- A.
  
  Fuse.
- B.
  
  Relay.
- C.
  
  Interlock.
- D.
  
  Circuit breaker.
24.

(407) What is a relay?
- A.
  
  A link of metal placed in series with a circuit.
- B.
  
  A switch that, when released, allows the current to flow uninterrupted.
- C.
  
  A device that communicates the information in a signal to another device.
- D.
  
  A device that tells the circuit breaker to interrupt current flow when the temperature rises.
25.

(407) In electrical work, what is generally used to control large, high-voltage currents with a lowvoltage, low-current signal?
- A.
  
  Fuses.
- B.
  
  Relays.
- C.
  
  Interlocks.
- D.
  
  Circuit breakers.