Mech 2 Flashcards

Questions and Answers

Which of the following is not a function of a solid coupling?

To connect two offset shafts together (correct)

To absorb shock

To transmit torque

To align shafts

What is NOT an important outcome of preventative maintenance of belt systems?

Extended lifespan of components

To satisfy OSHA (correct)

Reduced downtime

Increased efficiency

Wearing loose clothing near mechanical power transmission equipment can cause you to get pulled into the equipment.

True

What type of lubrication systems cannot be used to dispense oil?

Hand pack Signup and view all the answers

In a flexible jaw coupling, power is transmitted from the driving jaw to the driven jaw by?

The spider or elastomer filling the space between the coupling Signup and view all the answers

Lubricants provide six general applications for machines, which of the following is not a general function?

Allowing the system to be contaminated due to material in the lubrication Signup and view all the answers

What coupling is used to combine two short shafts to replace a long straight shaft?

Rigid coupling Signup and view all the answers

Which of the following is the best bearing type to use when the load is directed along the shaft?

Thrust bearing Signup and view all the answers

What would cause increased vibration in a coupling?

Too much lubrication was added Signup and view all the answers

Pitch is a method of expressing the measurement between:

Equally spaced repetitive units Signup and view all the answers

Which of the following is a purpose for mechanical power transmission?

All of the above Signup and view all the answers

What method is used to measure motor shaft speed (RPM)?

Touch the end of the shaft, while it's spinning, with a handheld tachometer Signup and view all the answers

Which of the following is not a method for temperature mounting a bearing shaft?

Heat all parts Signup and view all the answers

When using a chain puller, the jaws are opened and closed by?

Dial on top of the tool Signup and view all the answers

The concepts used to calculate speed and torque of multi-gear drives can also be applied to compound gears with which of the following changes?

Gear ratio of any gears mounted on the same shaft must be included in calculations Signup and view all the answers

In a four gear system, if the second gear is rotating counterclockwise, what direction is the fourth gear turning?

Counterclockwise Signup and view all the answers

The major feature of a split sleeve coupling is?

It allows the coupling to be removed without moving the two shafts Signup and view all the answers

Which of the following is part of a high torque synchronous or timing belt drive system?

A tooth belt on a tooth pulley Signup and view all the answers

Which of the following is a cause for a cracked pulley bushing in a v-belt drive system?

Improper pulley installation Signup and view all the answers

Which of the following is not true about a Material Safety Data Sheet?

Only available to HR Signup and view all the answers

Which of the following would be the best replacement for a one horsepower motor with a motor rated in watts?

750 watts Signup and view all the answers

What is the safest way to install a chain in a roller chain drive system?

Loosely put the chain over all sprockets and use a chain tensioner/puller Signup and view all the answers

Which of the following is the least accurate method of shaft alignment?

Straight edge and feeler gauge method Signup and view all the answers

Which of the following information would you need to calculate the gear ratio of a gear drive system?

Pitch diameters of the driver and driven gears Signup and view all the answers

A chain code of 50-4 indicates a chain that is ____ inch pitch chain.

0.625 Signup and view all the answers

The different types of lubricating greases are equally determined by their polymers that are utilized for keeping?

Parts free of contaminants Signup and view all the answers

What installation procedure that will shorten the life of the belt?

Force the belt onto the pulleys Signup and view all the answers

What instrument would give the best results to align a rigid coupling?

A straight edge Signup and view all the answers

A fractional HP V-BELT drive is intended for?

Light-duty application Signup and view all the answers

Which of the following is not a type of shaft key?

Snap Signup and view all the answers

A belt drive system has a 6 inch pitch diameter drive pulley and 12 inch pitch diameter driven pulley connected to a motor running at 1HP and 1000 RPM, what is the output speed?

500 RPM Signup and view all the answers

Study Notes

Mechanical Power Transmission

Solid couplings connect aligned shafts, not offset ones.
Preventive maintenance of belt systems aims to promote safety, not solely to satisfy OSHA.
Loose clothing near machinery can lead to entanglement and serious injury.

Lubrication Systems

Hand pack systems cannot dispense oil, unlike other types.
Lubricants avoid contamination and reduce friction, promoting efficient machine operation.

Coupling Types

Flexible jaw couplings transmit power through spiders or elastomers located between jaws.
Rigid couplings are used to join short shafts, replacing longer straight shafts.
Thrust bearings are ideal for loads directed along the shaft.
Split sleeve couplings allow for easy maintenance without repositioning shafts.

Gear Systems

When calculating multi-gear drives, consider the gear ratio of all gears on the same shaft.
In a four-gear setup, rotational direction is impacted by gear interaction; a counterclockwise second gear results in a counterclockwise fourth gear.
Gear ratios are calculated using pitch diameters of driver and driven gears.

Chain and Belt Systems

Chain pullers have jaws operated by a dial on top for easy handling.
Proper installation techniques for chain drive systems include using chain tensioners to avoid damaging the belt lifespan.
A 50-4 chain code indicates a chain with a pitch of 0.625 inches.
A V-belt drive system comprising a 6-inch drive pulley and a 12-inch driven pulley results in a 500 RPM output speed.

Safety and Maintenance

Important to follow installation procedures to extend belt life; forcing belts onto pulleys is detrimental.
The least accurate shaft alignment method is the straight edge and feeler gauge technique.
Material Safety Data Sheets (MSDS) should be accessible beyond HR departments; they are essential for worker safety.

Correct Terminology

A one horsepower motor equates to 750 watts.
Various types of lubricating greases protect against contaminants based on their polymer composition.

Belt Drive Applications

Fractional horsepower V-belt drives cater to light-duty applications.
Proper pulley installation is crucial, as improper practices can lead to damage like cracked pulley bushings.

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Description

Test your knowledge with these flashcards focused on mechanical engineering concepts from Mech 2. Each card provides questions about solid couplings, preventative maintenance, safety measures, and lubrication. Challenge yourself to understand essential mechanical functions and practices.