Building Maintenance & Tools Flashcards by Eric Saechao

Ultrasonic technology is used to detect wear patterns in ________ .
A. lubricants
B. Bearings.
C. Electronics
D. Belts

Answer: B. Bearings

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What is the purpose of a thermocouple?
A. Measure resistance
B. Measure temperature
C. Measure insulation
D. Measure voltage

Answer: B. Measure temperature

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Answer: C. 0.29

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Answer: D. 1.4371

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The electric heat element is usually made of what material?
a) Copper with a brass coating
b) Nickel with a cadmium coating
c) Nickel and steel
d) Nickel and chromium

d) Nickel and chromium

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Which of the following is an example of a resistive load?
a) Bimetal switch
b) Crankcase heater
c) Transformer
d) Motor

b) Crankcase heater

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When the temperatures of a structure both inside and outside are equal, there is:
a) no heat transfer
b) latent heat transfer to the outside
c) thermal heat transfer of sensible heat
d) a lower rate of relative humidity

a) no heat transfer

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Which of the following is a law of thermodynamics?
a) Heat is a form of matter
b) Heat moves toward a place with higher intensity
c) Heat moves toward a place with lower intensity
d) Heat moves toward a place with a higher temperature

c) Heat moves toward a place with lower intensity

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Sensible heat describes:
a) How fast heat will travel
b) The quantity of heat
c) The volume of heat
d) How hot something feels

b) The quantity of heat

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In an air conditioning and refrigeration system, what occurs in a condenser?
a) The refrigerant absorbs the latent heat
b) The refrigerant releases the latent heat
c) Latent heat is pressurized
d) Latent heat is increased

b) The refrigerant releases the latent heat

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In a sealed system, pressure and temperature:
a) are inversely proportional
b) go in opposite directions up and down
c) are equal
d) follow each other up and down

d) follow each other up and down

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Which of the following is not a type of compressor?
a) Lateral
b) Reciprocating
c) Rotary
d) Screw
e) Centrifugal

a) Lateral

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Which of the following is not a method by which heat may be transferred from a warmer substance to a colder substance?
a) Conduction
b) Retraction
c) Convection
d) Radiation

b) Retraction

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Vaporization can be increased by _____________ the pressure on a liquid.
a) Increasing
b) Equalizing
c) Reducing

c) Reducing

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Every mechanical refrigeration system has __________ different pressure levels.
a) 2
b) 3
c) 4
d) 5

a) 2

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Pressure on the high-pressure side of a mechanical refrigeration unit is called:
a) suction pressure
b) discharge or head pressure
c) differential pressure
d) absolute pressure

b) discharge or head pressure

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What effect would hooking up a 240-volt transformer to a 208-volt supply voltage have on the secondary voltage?
a) Secondary voltage will be less
b) Secondary voltage will be more
c) Primary voltage has no effect on secondary voltage
d) Secondary voltage is always rated on the transformer

a) Secondary voltage will be less

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When the 16-tooth gear turns 4 times, how many times does the 8-tooth gear turn?
a) 2
b) 4
c) 8
d) 16

b) 8

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To repair a part that has failed, the most important part of Re-Welding is:
A.) The Size of the Weld
B.) Proper Welding Machine
C.) Material and Electrode Composition
D.) Correct Electrode Holder

C.) Material and Electrode Composition

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Tinning a Soldering Copper consists of:
A.) Heating until Rainbow Colors appear
B.) Cleaning and Coating with Solder
C.) Keeping the Soldering Tip Bright and Clean
D.) Filing

B.) Cleaning and Coating with Solder

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When disassembling a machine, parts and fasteners should be:
A. Cleaned and labeled
B. Separated and painted
C. Always replaced
D. Inspected

A. Cleaned and labeled

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What is the proper tightening sequence for the following (5-bolt pattern):
A. 1, 2, 3, 4, 5
B. 1, 5, 4, 3, 2
C. 1, 3, 5, 2, 4
D. Does not matter

C. 1, 3, 5, 2, 4

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A seal ____________________ .
A. Reduces internal contamination
B. Prevents leakage of the system
C. Supports outer diameter of input shaft
D. Prevents buildup of static electricity

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B. Prevents leakage of the system

Cavitation in a centrifugal pump can be caused by:
A. Low speed
B. Air in the discharge
C. Bearing defects
D. Air in the suction

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D. Air in the suction

This type of nut typically has a smaller depth than a standard nut and is used to lock another nut in place: A. Jam nut B. Nylock nut C. Button nut D. Cap nut

A. Jam nut

What does the “20” mean in a ¼”–20 bolt? A. The material used B. The amount of torque the bolt can withstand C. The bolt’s diameter D. The pitch of inch

D. The pitch of inch

How many flats or points does a standard impact socket have? A. Four B. Six C. Eight D. Five

B. Six

Which tool is used to measure gap size in a rough alignment: A. Inside caliper B. Dial indicator C. Feeler gauge D. Measuring tape

C. Feeler gauge

Ball valves are commonly used to: A. Throttle flow B. Check flow C. Change flow direction D. Start/stop flow

D. Start/stop flow

Where in the NEC® would you find information on circuit breaker applications? A. NEC Section 240.85 B. NEC Section 250.4(A)(1) C. NEC Section 310.15 D. NEC Section 340.12

A. NEC Section 240.85

Worn motor bearings are most likely to result in a(n): A. Temporary overload B. Sustained overload C. Short circuit D. Ground fault

B. Sustained overload

The type of electrical tape used to provide a protective overwrap for high-voltage cable is: A. Linerless rubber splicing tape B. High-temperature silicone rubber tape C. Vinyl plastic tape D. Glass cloth electrical tape

A. Linerless rubber splicing tape

A transparent, semi-rigid heat-shrink insulator that provides good abrasion resistance is: A. Neoprene B. Teflon® C. Kynar® D. PVC

C. Kynar®

Motor connection kits are selected based on the size of the: A. Motor feeder cable B. Overcurrent protection C. Motor terminals D. Motor full-load amperage

A. Motor feeder cable

When using a cutting tool, a dull cutting edge: A. Is safer than a sharp edge B. Is less likely to cause conductor damage C. May result in slips D. Is unlikely because the tools self-sharpen

C. May result in slips

Positioning cable so that it is not under tension is known as: A. Training B. Bending C. Racking D. Crimping

A. Training

What is the main advantage of pneumatic systems over hydraulic systems? A) Higher pressure capacity B) Lower energy consumption C) Cleaner and less likely to contaminate environment D) More accurate control of movement

C) Cleaner and less likely to contaminate environment

What does a double-acting pneumatic cylinder do? A) Extends using air and retracts using a spring B) Requires air pressure for both extension and retraction C) Works only with hydraulic systems D) Releases pressure automatically when extended

B) Requires air pressure for both extension and retraction

Which component is used to adjust the speed of a pneumatic cylinder? A) Solenoid valve B) Pressure regulator C) Flow control valve D) Directional control valve

C) Flow control valve

What is the purpose of a pneumatic FRL unit (Filter, Regulator, Lubricator)? A) To improve air pressure B) To stop leaks in hoses C) To condition the air supply D) To create vacuum pressure

C) To condition the air supply

In pneumatic systems, what causes a cylinder to stall or move slowly? A) Over-pressurization B) Electrical fault C) Air leak or restricted flow D) Worn piston rings

C) Air leak or restricted flow

Which device is used to change the direction of airflow in a pneumatic system? A) Flow restrictor B) Muffler C) Directional control valve D) Pressure gauge

C) Directional control valve

Which of the following is not a common cause of pneumatic system failure? A) Moisture in the air lines B) Undersized compressor C) Dirty air filter D) Excessive oil pressure

D) Excessive oil pressure ## Footnote That's typically a hydraulic issue, not pneumatic.

What would cause hissing sounds in a pneumatic system? A) Electrical grounding issue B) Air leaking from a fitting or hose C) Solenoid overheating D) Water hammer

B) Air leaking from a fitting or hose

Which of these reduces pressure in a pneumatic system to a desired setpoint? A) Filter B) Actuator C) Regulator D) Solenoid

C) Regulator

What unit is typically used to measure air pressure in a pneumatic system? A) Volts B) PSI C) GPM D) RPM

B) PSI (Pounds per Square Inch)

What is the primary function of an air compressor? A) To regulate pressure in hydraulic lines B) To convert electrical energy into heat C) To increase the pressure of atmospheric air D) To remove humidity from air

C) To increase the pressure of atmospheric air

Why is a pressure relief valve installed on an air compressor? A) To increase tank pressure B) To prevent compressor startup C) To protect the system from over-pressurization D) To shut down the motor

C) To protect the system from over-pressurization

What is a common symptom of moisture buildup in a compressed air system? A) Excessive voltage B) Oil in the air lines C) Rust in tools and piping D) High amperage draw

C) Rust in tools and piping

Which component removes water vapor and particles from compressed air? A) Expansion valve B) Air dryer or filter C) Check valve D) Drain valve

B) Air dryer or filter

A compressor motor is tripping its overload after a few minutes. What is the most likely cause? A) Low voltage B) High tank pressure C) Undersized air tank D) Oversized pressure switch

A) Low voltage

What is the cut-in pressure on an air compressor? A) The pressure at which the relief valve opens B) The pressure at which the compressor starts running C) The highest pressure the compressor can handle D) The amount of pressure needed for tools

B) The pressure at which the compressor starts running

Which of the following is a sign of a faulty unloader valve in an air compressor? A) Air tank overfills B) The compressor won’t stop C) Hard starting under load D) Low oil pressure

C) Hard starting under load

Why is regular draining of the air compressor tank necessary? A) To cool the tank B) To remove accumulated water C) To reset the pressure switch D) To prevent air leaks

B) To remove accumulated water

What is the function of a check valve in an air compressor system? A) Regulate airflow into tools B) Prevent backflow of air into the compressor C) Bleed off excess pressure D) Separate oil from air

B) Prevent backflow of air into the compressor

Which type of air compressor uses rotating screws to compress air? A) Reciprocating B) Scroll C) Rotary screw D) Diaphragm

C) Rotary screw

Building Maintenance & Tools Flashcards

(56 cards)