Free Amazon Maintenance Technician Question and Answers 1 — Questions and Answers
Question 1: When installing components in a pneumatic system, the proper order is:
- Filter - Regulator - Lubricator (Correct answer)
- Filter - Lubricator - Regulator
- Regulator- Filter - Lubricator
- Lubricator - Regulator - Filter
Correct answer: Filter - Regulator - Lubricator
In a pneumatic system, the standard and most effective order for installing air preparation components is Filter, then Regulator, then Lubricator (FRL). The filter removes contaminants, the regulator controls the air pressure, and the lubricator adds a fine oil mist to lubricate moving parts, ensuring clean, controlled, and lubricated air for optimal system performance and longevity.
Question 2: It is possible that an AC power system's power factor WILL NOT be:
- 0.2
- 1.5 (Correct answer)
- 0.7
- -0.85
Correct answer: 1.5
The power factor in an AC power system is a dimensionless quantity that always falls within the range of -1 to 1, inclusive. It represents the ratio of real power to apparent power. A value of 1.5 is outside this physically possible range, making it an invalid power factor for any AC system.
Question 3: Megohmmeters are typically employed to measure:
- Magnets
- Insulation (Correct answer)
- Power sources
- Fuses
Correct answer: Insulation
A megohmmeter, often called a 'megger,' is a specialized type of ohmmeter used to measure very high electrical resistance. Its primary application is to test the integrity of electrical insulation in cables, motors, and other equipment. By applying a high DC voltage and measuring the resulting small current, it determines if the insulation is sufficient to prevent current leakage and ensure safety.
Question 4: A ______ is used to stop an AC solenoid from "humming"
- There are no AC solenoids
- Thicker coil
- Shading ring (Correct answer)
- Spring return
Correct answer: Shading ring
AC solenoids can produce an audible 'hum' due to the alternating magnetic field causing the armature to vibrate at twice the line frequency. A shading ring, typically a short-circuited copper loop embedded in the pole face, creates a lagging magnetic flux. This lagging flux ensures that there is always some magnetic pull on the armature, even when the main AC flux momentarily drops to zero, thereby preventing vibration and eliminating the hum.
Question 5: Intermittent welding has the benefit of being:
- Easier to repair in case of failure
- More economical
- More economical and easier to repair in case of failure (Correct answer)
- Stronger
Correct answer: More economical and easier to repair in case of failure
Intermittent welding, also known as skip welding or stitch welding, involves creating short, spaced-out weld segments rather than a continuous bead. This technique uses less filler material and consumes less energy, making it more economical. Additionally, if a weld fails, only the specific segment needs to be repaired or re-welded, which is often simpler and less time-consuming than repairing a long continuous weld.
Question 6: A neutral flame differs between a carburizing flame and an oxidizing flame because:
- Different welding instrument
- Different fuel used
- Different ignition source
- Different acetylene-oxygen ration (Correct answer)
Correct answer: Different acetylene-oxygen ration
In oxy-acetylene welding, the type of flame produced is determined by the ratio of acetylene to oxygen. A neutral flame has an equal balance of acetylene and oxygen, resulting in complete combustion and a clean, well-defined inner cone. A carburizing flame has an excess of acetylene, while an oxidizing flame has an excess of oxygen, each producing distinct characteristics and being suitable for different welding applications.
Question 7: Which of the aforementioned equipment should you apply the splash technique lubrication on?
- Car
- Lawnmower (Correct answer)
- Ship
- Truck
Correct answer: Lawnmower
The splash lubrication technique is a simple method where moving parts, typically a dipper on a connecting rod, dip into an oil reservoir and splash oil onto other components. This method is commonly found in small, less complex engines that operate at moderate speeds, such as those in many lawnmowers. It's an economical and effective way to lubricate the crankshaft, connecting rod bearings, and cylinder walls in such applications.
Free Amazon Maintenance Technician Question and Answers 1
When installing components in a pneumatic system, the proper order is: