PMMI Example questions

Question 1

Which if the following is the coupling that would be used to combine two short shafts to replace a long straight shaft?

A-rigid coupling
B-flexible coupling
C-universal coupling
D-clutch coupling

Answer 1

a-rigid coupling

Question 2

Which of the following instrument gives superior results when used to align a rigid coupling?

A- dial indicator
B- tape measure
C-level indicator
D- straight edge

Answer 2

A dial indicator

Question 3

Which of the following is a method used to allow for the effect of thermal expansion of a mechanical coupling used in motor drives?

A- brass shims around the shaft
B- felt padding glued to to the shafts
C- small gaps between shaft faces
D- coolant fluids dripped on the component

Answer 3

c-small gaps between shaft faces

Question 4

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

a- bolts attaching the two hubs
b-key connecting the two hubs
c-spider or elastomer filling the space between the hubs
d- shaft that the hubs turn on

Answer 4

c-spider or elastomer filling the space between the hubs

Question 5

Quality assurance(QA) has requested a machine to be converted to use only food grade lubricants, the tech should select the lubricants by

A-using lubricants similar to those used in other plant applications
B- matching temp and viscosity specifications of the non food lubricants
C-consulting with both machine and lubricant manufacturers
D-consulting QA and the lubricant manufacturer

Answer 5

c consulting with both manufacturers and lubricant manufacturers

Question 6

Which of the following is a cause of increased vibration in a coupling after re-lubrication?

A-the lubricant was too cool
B-too much lubricant was added
C-not enough lubricant was added
D-lubricant was added to quickly

Answer 6

b- too much lubricant was added

Question 7

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

A- to connect two shafts together
B- connect two offset shafts together
C- connect different size shafts together
D- to connect a gearbox and a motor together

Answer 7

b-connect two offset shafts together

Question 8

A single engine drives a common shaft that powers several machines simultaneously. which of the following is the coupling used to allow each machine to operate independently?

A- rigid couplings
B- flexible couplings
C- universal joint couplings
D- clutch coupling

Answer 8

d clutch coupling

Question 9

Which of the following types of couplings utilizes a serpentine spring?

A- gear coupling
B- grid coupling
C- chain coupling
D- all the above

Answer 9

b grid coupling

Question 10

low power output engines rely on the lubrication method where a moving part dips into the lubricant and proceeds to distribute oil. this is commonly referred to as which of the following?
a- wick feed oiler device
b-splash oiler device
c-gravity fed oiler device
d-pressurized device

Answer 10

b splash oiler device

Question 11

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

A- parts free of containers
B-components from rusting
C- oil in place
D-all the above

Answer 11

d all the above

Question 12

Which of the following is the primary function of a lubricant?

A-to retain heat
B- conduct electricity
C- join moving parts in a system
D-to improve mechanical efficiency

Answer 12

d to improve mechanical efficiency

Question 13

Which of the following is not true about lubricant storage

A- never store lubricants in open containers
B- it is important to label lubricant containers and to control their issue and use
C-lubricants are flammable and special precautions are necessary ti reduce fire risk
D- lubricant oil drums should be stored upright and horizontally

Answer 13

B it is important to label containers and to control their issue and use

Question 14

Grease as a lubricant is best suited for application where

A- lubricating oil would not stay in place
B-a sealant is required to contain gases
C-the application of lubricant is frequent
D- heat transfer by circulation is required

Answer 14

a lubricating oil would not stay in place

Question 15

Under which of the following conditions can visconismeters measure viscosity of a fluid?

A-stationary condition
B-turbulent flow conditions
C-various temps
D-laminar conditions

Answer 15

a stationary conditions

Question 16

Which of the following describes the condition under which synthetic oil has a performance advantage over traditional natural and mineral oils

A-where temps are stable
B-where moderate running loads are present
C-where there are longer replacement preventive maintenance schedules
D-where equipment is operating under indoor temps

Answer 16

c where there are longer replacement preventative maintenance schedules

Question 17

Which of the following is not true about a material safety data sheet (MSDS)?

A- it is a form containing data regarding the properties of a particular substance
B-OSHA’s Hazard Communication Standard requires manufacturers or distributors of hazardous materials to assess the physical and health hazards
C- per the Hazard Communication Standard, MSDS must be obtained and maintained for every chemical used in a workplace
D - The MSDS should only be accessible to the company purchase agent

Answer 17

d The MSDS should only be available to the company purchasing agent

Question 18

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

A- v belt on a flat pulley
B- tooth belt on a flat pulley
C- flat belt on a toothed pulley
D-tooth belt on a tooth pulley

Answer 18

D tooth belt on a tooth pulley

Question 19

Which of the following is the way to determine chain sag?

A-pinch the feed and return the sides of the chain, then measure the distance between the links
B-rotate the drive sprocket forward and measure the deflection on the slack side of the chain
C-remove the chain and make sure it is twice as long as the distance between sprockets
D-rotate the drive sprocket and measure the deflection on the tight side of the chain

Answer 19

b rotate the drive sprocket and measure the slack side of the chain

Question 20

Which of the following types of gear drive system uses a flat gear?

A-rack and pinion
B-worm gear
C-bevel gear
D-helical gear

Answer 20

A rack and pinion

Question 21

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

A-clockwise
B-to the right
C-counterclockwise
D-cannot determine from the info provided

Answer 21

c- counterclockwise

Question 22

A spur gear drives transfer power between

A-parallel shafts
B-angular shafts
C- perpendicular shafts
D-all the above

Answer 22

a parallel shafts

Question 23

Manufactured space between gear teeth results in

A-backlash
B-air space
C-whiplash
D-lubrication space

Answer 23

a backlash

Question 24

Which of the following would NOT be a typical function for a mechanical power transmission system? To
_____________________ between input shaft and output shaft.
a) increase or decrease torque
b) increase or decrease speed
c) increase or decrease energy consumption
d) change direction of rotation

Answer 24

c) increase or decrease energy consumption

Question 25

A technician needs to install a sheave onto a one inch diameter motor shaft using a key fastener. The keyway on
the motor shaft is rectangular and measures .251” wide by .125” deep by 1.002” long. The key seat in the sheave
is rectangular and measures .252” wide by .130” deep by 1.250” long. Which of the following keys would be an
appropriate choice to use for an ANSI Class 1 fit?
a) a square key measuring .249” by 1.001” long
b) a 1” nominal Woodruff key
c) a rectangular key measuring .250” by .125” by 1.000” long
d) a step key measuring .253” wide on one side, .126” wide on the opposite side, .249” high by .999” long.

Answer 25

a) a square key measuring .249” by 1.001” long

Question 26

A motor and a driven machine are both being attached to the top of a rigid horizontal foundation. Power from
the motor’s driving shaft is to be transmitted to the machine’s driven shaft through a coupling. Which of the four
following steps should be accomplished first?
a) adjust the horizontal parallel (offset) alignment
b) adjust the coupling gap
c) set the vertical parallel (offset) alignment
d) set the horizontal angular alignment

Answer 26

c) set the vertical parallel (offset) alignment

Question 27

Which mechanical system uses axial power transmission?

a. Belt drive system to drive a vaneaxial fan.
b. Gear drive system to run a conveyor.
c. Extending the length of a shaft.
d. All of the above.

Answer 27

C-Extending the length of a shaft.