Download MSSC Maintenance Awareness Questions with 100% Correct Answers | Updated & Verified | 2025 and more Exams Maintenance Engineering in PDF only on Docsity!
MSSC Maintenance Awareness Questions with
100% Correct Answers | Updated & Verified |
When connecting a 3-phase motor the three lines (T1,T2 and T3) are usually connected to. ✔✔- L1, L2, and L
Electricians use to prevent damage to electrical wiring running to the machine. ✔✔- rigid and flexible conduit
When the wire or foil strip inside a fuse melts, the fuse is said to be. ✔✔- blown
The difference between a fuse and a circuit breaker is. ✔✔- circuit breakers can be reset and used again
The amount two electrical waveforms are out of phase is measured in. ✔✔- degrees
The type of overload protection that protects the motor by disconnecting it physically instead of electrically is a(n). ✔✔- overload clutch
Which of the following is an advantage of a circuit breaker over a fuse? ✔✔- Can be reset
*T or F
The minimum number of sets of contacts a motor starter has depends on the number of power leads the motor requires. ✔✔- True
When current in a circuit is too high, it is usually the result of too many loads or a. ✔✔- short circuit
The measure of energy consumed by a circuit is called. ✔✔- power
For a single-phase AC motor, only___________motor wires connect to the power lines. ✔✔- 2
A technician has removed a piece of equipment from a disconnect, but the breaker still trips. The next step is to check the wiring to the disconnect and ..................... ✔✔- test the breaker again
The Ohm's Law formula for calculating voltage is .......................✔✔- E = I × R
When something binds or jams in rotating machinery, the machinery is protected by a(n). ✔✔- overload clutch
If a motor has an excessive load, what event is most likely to occur? ✔✔- Blow a fuse or trip a thermal overload
The total power in electrical circuit is calculated by finding the sum of the individual component power consumption. ✔✔- any
The spool of a directional control valve is shifted to different positions by the? ✔✔Operator
Most hydraulic motors are modified designs of? ✔✔Pumps
The hydraulic motor converts hydraulic flow into? ✔✔Rotary shaft speed
Which of the following is NOT a type of a hydraulic piston motor? ✔✔Spring loaded
are used to remove undissolved contaminates in hydraulic fluid. ✔✔Filters
Placing a filter in this location allows the filter to be cleaned without shutting down the machine? ✔✔Off-line
prevents large particles from damaging the pump and is placed in the reservoir. ✔✔Strainer
A filter is designed to handle the full pressure of the hydraulic system. It uses a replaceable cartridge and is enclosed in a metal casing called a bowl. ✔✔Pressure line filter
The filter, commonly used on suction or return lines, is similar in appearance to a pressure line filter but cannot withstand the full pressure of the hydraulic system. ✔✔Cartridge type filter
The filter, used for low pressure applications, has a removable cartridge that can be cleaned or replaced. ✔✔Spin-on
are rated by the size of contaminates they remove. ✔✔Hydraulic filters
The amount of dirt collected by a filter when the pressure reaches a predetermined point is called the? ✔✔The Dirt holding capacity
A can show when DHC of a filter has been reached. ✔✔Bypass indicator
In a mechanical trasmission system an electric motor is also called a ✔✔Prime Mover
The three types of shaft to adjacent shaft power transmission are ✔✔Chain Drive, Gear Drive, and Belt Drive
Companies typically require that as part of their shop safety rules ✔✔Safety glasses be worn
Some rules for safe dress to wear around machinery when it is running are ✔✔Wear high fitting clothing and heavy duty shoes
To protect your eyes in production areas, is/are required OSHA ✔✔Safety Glasses
In addition to dress rules another rule you should follow with machinery is ✔✔Do not work on wet floors
The radial load capacity of a linear bearing increases with ✔✔A greater number of balls
A(n) bearing has inner and outer races that allow it to carry heavier axial loads than a standard ball bearing ✔✔Angular Contact
Heavy axial loads are better handled by ✔✔Angular Contact Bearings
A machine shaft and bore should always be checked for out of round status before performing status what task? ✔✔Pressing a bearing
A shaft coupling may be out of round if a dial indicator shows ✔✔Any movement
The following is an example of ✔✔a tightening sequence
Which flange is shown with the correct tightening sequence ✔✔D
Bearing metal that flexes during use is the cause of ✔✔Ultimate fatigue
High temperature can of a bearing ✔✔Limit life
Which of the following is not part of regular maintenance for anti-friction bearings? ✔✔Replace traces
Making sure that a motor shaft is level ✔✔Reduces the number of needed shims
Motor shaft runout is checked to make sure of proper ✔✔Alignment of mating components
The coupling provides a secure method of transmitting from one shaft to another ✔✔Torque and speed
couplings are used to act as a safety device if torque overload occurs ✔✔Clutch
The advantage of the flexible jaw coupling is that it than most coupling methods ✔✔Allows more misalignment
Before installing a flexible coupling you check for ✔✔Run out
A common sign of a misaligned coupling is ✔✔Excessive Vibration
The two major types of misalignment that are corrected by shaft alignment are ✔✔Angular and Parallel
Before adjusting motor position during a shaft alignment always make sure to remove the ✔✔Dial indicator
Feeler gauges, rulers, height gauges and dial indicators are commonly used for which task? ✔✔Alignment of Industrial Machines
In the calculation of shaft speed and shaft torques of a belt drive system, which of the following applies? ✔✔- shaft speeds are inversely proportional to pitch diameters.
Belt span is defined as the. ✔✔- distance between the points on the sheaves where the belt touches each sheave.
The three (3) components for a belt drive system are: ✔✔- Belt, driver sheave, and driven sheave.
The fractional horsepower (FHP) V-belt, also called a light duty belt is designed for low power application below Hp. ✔✔- 7.5 Hp.
The V-belt should ride in the groove with its top near the top of the sheave; the V-belt does not touch the of the sheave. ✔✔- high, bottom
A should be used to check for sheave groove wear. ✔✔- sheave gauge
One important characteristic of a timing belt is that. ✔✔- it will not slip during operation.
The driven pulley in the belt drive system shown is rotating at RPM. ✔✔- 1200
What device provides the means by which electrical circuits control pneumatic or hydraulic systems? ✔✔Solenoid-operated directional control valve
OR logic is formed by. ✔✔- two normally open switches in parallel.
Which of the following logic elements describes two or more normally closed switches in parallel? ✔✔- NAND
Which type of logic element uses a relay? ✔✔- Memory
A power diagram is needed with a ladder diagram to show. ✔✔- proper connections for the power devices being used
Which of the following is not an element of control logic? ✔✔- NEXT
Devices called often serve as the brains of an automated machine. ✔✔- relays
Which of the following elements describes two or more normally closed switches in series? ✔✔- NOR
Rule for drawing a ladder diagram? ✔✔- Label all components.
- Number all rungs.
- Use only one load per rung.
***** All of the above
Which of the following is not a component of a ladder diagram? ✔✔- Valve
-It is the most frequently-used input device on automatic machines.
******All of the above
The schematic symbol shown is a limit ✔✔N.C.
A control circuit that uses limit switches to sequence a series of events is called an? ✔✔Event sequencing circuit
Which of the following is not a component of a time-delay relay? ✔✔Alarm
An on-delay timer relay's contacts will not change states until? ✔✔A predetermined time has elapsed
An off delay timer contact? ✔✔Energizes when the timer is activated and de-energizes when the timer times out
