PMMI Mechanical Components
A flap tucker mounted on a shaft driven with an 8-inch pitch diameter sprocket, connected by chain to a 2-inch pitch diameter motor sprocket, is rotating at 100 rpm. How fast is the motor turning?
400rpm
Which of the following would be an acceptable chain sag for a horizontal roller chain drive?
5% of the distance between the shafts
A belt drive system has a 6 inch pitch diameter drive pulley and 12 inch diameter driven pulley connected to a motor running at 1 hp and 1000rpm, what is the output speed?
500 rpm
Which of the following would be the best replacement for a one horsepower motor with a motor rated in watts?
750 watts
When using a chain puller, the jaws are opened and closed by_____
A dial on top of the tool
Which of the following is the coupling that would be used to combine two short shafts to replace a long straight shaft?
A rigid coupling
What instrument give superior results when used to align a rigid coupler?
A straight edge
Which of the following is part of a high torque synchronous or timing belt drive system?
A tooth belt on a tooth pulley
The primary purpose of a block type machine foundation is to:
Absorb energy to maintain stability during operation
Pitch is a method of expressing the measurement between?
Equally space repetitive units
When installing a threaded fastener, the use of a torque wrench is called for:
Every time a fastener is installed
The major feature of a split sleeve coupling is ____
It allows the coupling to be removed without moving the two shafts
A fractional hp v belt drive is intended for?
Light Duty application
Which of the following is the best method for replacing an existing properly sized belt?
Match the cross section to the catalog and calculate belt length
Grease is made by adding a thickener such as_____ to a liquid lubricant.
Metallic soap
Upon investigation, it is determined that a synchronous belt drive system is exhibiting unusual noises. This can result from what?
Misaligned pulleys in the system
Which of the following is the first step in replacing a worn drive chain with a master link?
Move the chain to a position where the master link is easy to access
Which of the following is a cause of increased vibration in a coupling?
Not enough lubricant was added
What type of threaded nut is the most resistant to coming loose under vibration conditions?
Nylon insert nut
Which simple method can be used to determine if a 1/4-20SAE hex cap screw is grade 8
Observe six hash marks on the head of the cap screw
A spur gear drive transfers power between:
Parallel, angular, and perpendicular shafts (All of the above)
The different types of lubricating greases are equally determined by their polymers that are utilized for keeping:
Parts free of contamination
Which of the following is not true about a Material Safety Data Sheet?
Per the Hazard Communications Standard, MSDS's must be obtained and made for every chemical used in the workplace.
Which of the following is the bearing used to mount a shaft parallel to the mounting surface?
Pillow block mount
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
Which of the following is the function that the slots perform in an electric motor mount plate?
Provide an adjustment for component tension
If you need to do repair work on a machine that has moving parts:
Put a lock and tag on the machine so that it is impossible to start the machine
After use, used oil should be_____
Recycled or collected by an EPA approved service
A chain breaker is a tool strictly designed for____
Removing a link from the chain
Which of the following is the component of a motor that is not used as a motor mounting surface to a machine?
Rotor
Which of the following is a commonly used method to keep a parallel key in the keyway of a motor shaft?
Screw-in the hub of the component
Which of the following is the type of bearing that allows small angular misalignment?
Self-aligning bearing
Which of the following is the part of an electric motor that provides an attachment point for power transmission?
Shaft
What is the primary function of a bearing?
To allow smooth, low friction motion between two surfaces
Detergent additives are used in oils____
To break up and wash away deposits
What is a purpose for mechanical power transmission?
To change speed, torque and direction (All of the above)
Which of the following is not a function of a solid coupling?
To connect two offset shafts together
What is an important outcome of preventative maintenance of belt systems?
To increase the life of the belt and sheave
Which of the following describes when a speed reducer is used in power transmission?
To increase torque
Which method is used to measure motor shaft speed?
Touch the end of the shaft, while it's spinning, with a handheld tachometer
A chain code of 50-4 indicates a chain that is ____ inch pitch chain.
0.625
A driver sprocket has 30 teeth and a driven sprocket has 90 teeth. What is the torque applied to the driven shaft if the input torque is 60-lb?
180in-lb
A water pump is driven by an electric motor, which is connected to it by a coupling. The pump is leaking badly and is replaced by an identical new pump. Which of the following is most important to ensure reliable long term operation?
Aligning the shafts of the pump and motor
Lubricants provide six general applications for machines, which of the following is not a general function?
Allows system to be contaminated due to material in the lubrication
Which of the following describes the style of hub on a sprocket that has the least need for a key way?
Bushing
Which of the following instruments is used to accurately measure the diameter of a motor shaft?
Caliper
Wearing loose clothing near mechanical power transmission equipment:
Can cause you to get pulled into the equipment
Which of the following is the way notched V-belts provide an advantage over classical V-belts?
Can operate over a small-diameter pulley
Which of the following is the method by which speed is adjusted on a variable speed v belt drive?
Changing the width of the pulley groove
If you approach a machine that is disabled with a Lockout/Tagout from a previous shift, how do you restart the machine?
Contact your supervisor and apply company policy
In a four gear system, if the second gear is rotating counterclockwise, what direction is the fourth gear turning?
Counter-clockwise
A v belt match code is used to:
Determine the best belt for the application
Which of the following is the formula used to calculate sprocket ratio?
Driven sprocket teeth / Driver sprocket teeth
Consider a motor and a drive device mounted to a base plate. When aligning the two shafts vertically, by using the straight edge and feeler gauge method, the __ shaft should be .015 higher than the ___ shaft
Driven, driver
The three qualities used when specifying a grease are: type of soap, hardness, and ____
Dropping point
In order to drive a gear pump by an electric motor, a coupling is needed to connect the two. Precise shaft alignment is not possible to maintain due to the nature of the motor mount. Which of the following is the type of coupling that should be used?
Flexible
Which of the following is an installation procedure that will shorten the life of the belt?
Force the belt onto the pulleys
The concepts used to calculate speed and torque of multi-gear drives can also be applied to compound gears with which of the following?
Gear ratio of any gears mounted on the same shaft must be included in calculations
According to the Occupational Safety and Health Act, the point of operation of machines whose operation exposes an employee to injury, shall be
Guarded
Which of the following lubrication systems cannot be used to dispense oil?
Hand pack
Which of the following is not a method for temperature mounting a bearing shaft?
Heat all parts/Heat both parts
Which of the following is a cause for a cracked pulley bushing in a v belt drive system?
Improper pulley installation
What method is used to allow for the effect of thermal expansion of mechanical couplings used on motor drives?
Small gaps between the shafts
Which of the following is not a type of shaft key?
Snap
The pitch diameter is important because it allows you to calculate which of the following measurements that are transmitted to the driven shaft?
Speed and torque
Which of the following is the least accurate method of shaft alignment?
Straight edge and feeler gauge method
What is the safest way to install a chain in a roller chain drive system?
Stretch the chain over as much of the drive sprocket as you can
Which of the following is the function that idler pulleys perform in a belt drive system?
Tension belts
Which of the following is the main advantage of a quick disconnect bushing over other bushing systems?
The bushing fasteners can be installed from either side of the flange
Which of the following determines the speed ratio in a chain drive system?
The outside diameters of the driver and driven chain
Wear on the sides of a roller chain could indicate?
The shafts are not in parallel The sprockets are not in the same plane Obstructions are interfering with the chain. (All of the above)
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
Which of the following is pitch referring to?
The theoretical diameter of the pitch circle of the gear
Which of the following is the best bearing type to use when the load is directed along the shaft?
Thrust bearing
Low power output engines rely on the lubrication method where a moving part dips into the lubricant and proceeds to distribute the oil. This is commonly referred to as?
Wick feed oiler device
Silent chains are made up of which two parts?
plates and pins
