STS-C Exam Question Set #1

What are the six basic requirements of safeguards?

1. Prevent Contact 2. Secure 3. Protect from falling objects 4. Create no new hazards 5. Create no interference 6. Allow safe lubrication

The state of being whole, unbroken is called:

Continuity

When applying power to a slide in order to trim or shear metal or other materials, the action is referred to as:

Shearing action

The ability of a material to conduct electric current. It is expressed in terms of the current per unit of applied voltage. It is the reciprocal of resistivity.

Conductivity:

One billion watts is a:

Gigawatt

Concrete members (such as walls, panels, slabs, columns, and beams) that have been formed, cast, and cured prior to final placement in a structure are:

Precast Concrete

The blasting operation by which the rock formation is dislodged from its natural location is called:

Primary Blasting

The individual responsible for the design of structural steel framing and whose seal appears on the structural contract documents in the:

Project Structural Engineer

An entity that has the overall responsibility for the construction of the project-its planning, quality, and completion is the:

Controlling Contractor

A transfer switch is an automatic or non-automatic device for transferring one or more load conductor connections from one power source to another.

Transfer switch

That part of a circuit run from a lighting outlet box where a luminaire or lampholder is installed down to an outlet box that contains the wall switch that turns the light or other load on or off: it is a control leg of the branch circuit.

Switch-leg

A large single panel, frame, or assembly of panels having switches, over-current, and other protective devices, buses, and usually instruments mounted on the face or back or both is a:

Switchboard

The potential difference between two points in an electrical circuit is measured in:

Volts

A barrier erected on a roof to warn employees that they are approaching an unprotected roof side or edge and which designates an area in which roofing work may take place without the use of guardrail, body belt, or safety net systems to protect employees in the area is a:

Warning line system.

Hazard determination in welding is accomplished by evaluating the:

Welding method and materials to be welded along with the physical location.

Trench boxes are a common piece of equipment used in construction. Trench boxes are:

A shield to protect workers for cave-ins and must be designed or approved by a registered professional engineer.

For a fire to occur, an ignition source is required. Which of the following consititute an ignition source? I. Power tools II. Radiant heat space heater III. Arc welding IV. Wood framing activities using hand tools only V. Linseed oil soaked rags

All of the above

A wire or combination of wires not insulated from one another, suitable for carrying electric current.

Conductor

A switch intended for use in basic distribution and branch circuits, rated in amperes and is capable of interrupting its rated voltage is a:

General use switch

A type of general-use switch so constructed that it can be installed in flush device boxes or on outlet covers, or otherwise used in conjunction with wiring systems recognized by the National Electric Code

General-use snap switch

A type of guard that is simple, can often be easily constructed and installed at the shop, requires minimum maintenance and is usually very effective is a(n):

Fixed guard

Steel joist bridging connected to a bridging terminus point is:

Anchored Bridging

An example of over-current protection is: A) A transformer. B) A GFCI. C) A capacitor. D) A fuse.

D: A fuse

A tool used to spread out and smooth concrete is called a:

Bull Float

One millionth of a unit is a:

Micro

A device that utilizes a series of cables attached to the operator's hands, wrists, and/or arms is a:

Pullback Device

Generally, the person that knows the most about how to accomplish a task is:

The worker

A unit of measure of power is:

Watts

A crane where the lifting mechanism is mounted on a cross-beam supported on vertical legs which run on rails is a:

Gantry Crane

The unit of measure of electrical current is:

Amps

Which of the following would be an appropriate extinguisher to use on a fire involving the trash wood pile at the worksite?

A fire extinguisher labeled A.

Fuses and circuits must be provided: A) To over current of the facilities electrical wiring. B) To protect people from shock. C) To prevent overuse of extension cords. D) To protect against shorted ground wires.

A) To over current of the facilities electrical wiring.

MIG and TIG welding incorporate a gas in the welding process. The gas introduces what hazard to the work?

Ashpyxiation

Metal parts of equipment do not have to be grounded when:

B) The equipment is equipped with a system of double insulation.

The amount of heat energy required to raise die temperature of one pound of water from 60° F to 61 ° F at one atmosphere pressure is a:

BTU (British Thermal Unit)

Crossed bridging that is bolted to a steel joist or joists is:

Bolted Diagonal Bridging

The breaking of boulders by firing a charge of explosives that has been loaded in a drill hole.

Block Holing

Members pre-stressed before the application of the superimposed loads and having all cables or tendons fully bonded to the concrete or grouted within ducts.

Category 1

As Category 1, but having the tendons left ungrouted. This type of construction can sometimes be recognized from the access points which may have been provided for inspection of the cables and anchors. More recently, unbonded tendons have been used in the construction of beams, slabs, and other member; these tendons are protected by grease and surrounded by plastic sheathing, instead of the usual metal duct.

Category 2

Members that are pre-stressed progressively as the building construction proceeds and the dead load increases, using bonded tendons, as Category 1.

Category 3

As Category 3, but using unbonded tendons, as Category 2.

Category 4

Construction workers who will work with and on scaffolds must be trained. Retraining is required when:

Changes at the work site create conditions that change the hazards and risks

Energy level at which electrons are not bound to (orbiting) a specific atomic nucleus but are free to wander among the atoms. An energy band in which electrons can move freely in a solid, producing a net transport of charge.

Conduction band or Conduction level:

A short wire-rope sling used to form a slip noose around the object to be moved or lifted is a:

Choker Rope

The reciprocal of resistance. It is the ratio of current passing through a material to the potential difference at its ends. This is called:

Conductance

Guard rails are a valuable safety system to protect workers from falls. A guard rail should be constructed:

D) To withstand an outward and downward force of 200 pounds and be 42 inches high.

Cranes require frequent and periodic inspections. Frequent inspections required for cranes include:

Daily pre-operational site and crane inspection, pre-start-up inspection and crane operation inspection.

The action taken to free equipment from any electric connection and/or electric charge is called:

De-energize.

A device with a probe or contact bar which descends to a predetermined distance when the operator initiates the machine cycle and prevents the machine from cycling if it does not descend the correct distance is called a(n):

Electrometrical sensing device

A lock designed to hold and permit the quick passage of an entire shift of employees is a:

Emergency lock

A scaffold consisting of a platform(s) supported on fabricated end frames with integral posts, horizontal bearers, and intermediate members is a:

Fabricated Frame Scaffold

A moveable barrier that protects the operator at the point of operation before the machine cycle can be started is a(n):

Gate

A wall separating buildings or subdividing a building to prevent the spread of fire and having a fire resistance rating and structural stability is called a:

Fire Barrier Wall

The amount of combustibles present in a given area, expressed in Btu/ft (kJ/m ), is the:

Fire Loading

Which of the following would be an appropriate extinguisher to use on a fire involving the wood frame around an electrical panel?

Fire extinguisher labeled C

The time, in minutes or hours, that materials and assemblies used as opening protection have withstood a fire exposure in testing is called the:

Fire protection rating.

There are four classes of fires. Class C fires are:

Fires in wiring, fuse boxes, energized electrical equipment, computers, and other electrical sources.

A total system of support for freshly placed or partially cured concrete, including the mold or sheeting that is in contact with the concrete as well as all supporting members including shores, hardware, braces, and related hardware is a:

Formwork

In underground construction activities, air pressure used to supply power to pneumatic tools and devices is often referred to as:

High Air

The physical activity of fire suppression, rescue or both, inside of buildings or enclosed structures which are involved in a fire situation beyond the incipient stage is called:

Interior structural firefighting.

A very effective guard that can allow easy access to the hazard point for actions such as removing jams of feed product is the:

Interlocked guard.

A switch intended for isolating an electrical circuit from the source of power. It has no interrupting rating and is intended to be operated only after the circuit has been opened by some other means.

Isolating Switch

Lifting vertically a slab (or group of slabs) from one location to another during a lift-slab construction operation is a:

Jacking operation

A switch in which the circuit is closed by a moving blade engaging contact clips.

Knife switch

The method commonly used for control of hazardous energy sources is referred to as:

LOTO (Lock out/Tag out)

A supported scaffold consisting of a platform resting on brackets attached to ladders is a:

Ladder Jack Scaffold

A method of concrete construction in which floor and roof slabs are cast on or at ground level and, using jacks, are moved into position is a:

Lift Slab Method

A switch, rated in horsepower, capable of interrupting the maximum operating overload current of a motor of the same horsepower rating as the switch at the rated voltage.

Motor-circuit switch

The blasting of boulders by placing a quantity of explosives against a rock, boulder, or other object without confining the explosives in a drill hole.

Mud-Capping

A rigging assembly manufactured by wire-rope rigging suppliers that facilitates the attachment of up to five independent loads to the hoist rigging of a crane is:

Multiple-Lift rigging

A hazard created between rotating and tangentially moving parts is referred to as s:

Nip Point

Fire is a hazard in every work environment. Some work activities and environments present a greater fire risk. For fire to occur these things must be present:

Oxygen, fuel, heat

A device that uses a system of light sources and controls which can interrupt the machine's operating cycle if the light field is broken is called a:

Photoelectric device.

The direct conversion of light into electricity is referred to as:

Photovoltaic

A supported scaffold consisting of a platform(s) resting on bearers, the outside ends of which are supported on runners secured to a single row of posts or uprights, and the inner ends of which are supported on or in a structure or building wall is a:

Pole Scaffold

A type of insulator with a bell shape used to connect underground electrical cables to overhead lines is called a:

Pothead

Circuit breakers are an over-current protection device that automatically shuts off the current in a circuit if an overload occurs. Circuit breakers are provided in electrical circuits for the purpose of:

Protecting the circuit and building or equipment from excessive damage during an overload.

A supported scaffold consisting of a platform supported by vertical poles and movable support brackets is a:

Pump Jack Scaffold

When power is applied to a slide (ram) for the purpose of blanking, drawing, or stamping metal or other materials the action is referred to as:

Punching Action

A device that measures when a capacitance field is broken and stops or prevents the operation of a machine is called a:

RF device

A device so constructed, protected, or treated as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions is:

Rainproof.

A device so constructed or protected that exposure to a beating rain will not result in the entrance of water.

Raintight

The gas and oxygen hoses for gas welding operations are:

Required to be clearly distinguishable from each other through color or texture and the fittings can not be interchangeable.

The construction operation in which shoring equipment is placed, as the original forms and shores are removed in order to support partially cured concrete and construction loads is called:

Reshoring

A device that utilizes cables or straps that are attached to the operator's hands and a fixed point is called a:

Restraint Device

A rooftop supported scaffold consisting of a platform resting on angular-shaped supports is a:

Roof Bracket Scaffold

Collars, couplings, cams, clutches, flywheels, shaft ends, spindles, meshing gears, and horizontal or vertical shafting are all examples of what type of hazard?

Rotating Motion

A device that provides a quick means for deactivating a machine in an emergency situation as a result of a pressure sensitive bar being depressed is a:

Safety trip control device

The reduction of oversize material by the use of explosives to the dimension required for handling is called:

Secondary Blasting

The type of guard commonly provided for circular hand saws and cut-off saws is the:

Self-adjusting guard.

Guards in which the openings to the hazard points are determined by the movement of the stock are called:

Self-adjusting guards.

Shoring is a classic method of providing a support system for trenches. Which of the following is an accurate description of the components of shoring?

Shoring systems consist of posts, wales, stmts, and sheeting. There are two basic types of shoring, timber and aluminum hydraulic.

When selecting a hard hat, it is important to assure that the hard hat is designed to meet the requirements of the work environment. One way to know that a hard hat has been designed and manufactured to provide the protection that it is required to provide is by;

The clear indication of the' listing' of the product as meeting ANSI Z89.1

You are using a multi-gas meter to monitor a confined space prior to entry by your work crew. The meter is properly calibrated and operational. The current readings indicate 19.5% oxygen, 7% LEL and 0.0% hydrogen sulfide. Based on the readings you conclude the following:

The oxygen level is safe for entry.

Wire rope is commonly used in construction for lifting. A one inch wire rope may continue to be used even if:

The wire rope has 5 broken wires in one lay of die rope and two of the broken wires in one strand of the rope.

A supported or suspended scaffold consisting of a platform(s) supported by tubing, erected with coupling devices connecting uprights, braces, bearers, and runners is a:

Tube and Coupler Scaffold

A device that requires concurrent application of both the operator's control buttons to activate the machine cycle, after which the hands are free is a:

Two-hand trip device

A device that requires constant, concurrent pressure on two points by the operator to activate the machine is a:

Two-handed control device

The space or compartment under air pressure in which the work is being done is a(n):

Working Chamber

Wire rope must be removed from service if:

• 6 broken wires exist in one lay of the rope or 3 broken wires in one strand. • 1/3 or more of the original diameter of die outside wires is lost to abrasion. • Ropes are damaged from heat or electricity.