M7

Question 1

The path of contact in involute gears
where the force/power is actually transmitted; it is a straight
imaginary line passing through the pitch point and tangent
to the base circle.
A. Front angle C. Pitch point
B. Line of action D. Principal reference plane

Answer 1

B

Question 2

The train value of gear train is _______
the speed ratio.
A. Double C. Half of
B. Equal to D. Reciprocal of

Answer 2

D

Question 3

he purpose of ______ is to
prevent gears from jamming together and making contact
on both sides of their teeth simultaneously.
A. Tooth fillet C. Backlash
B. Stress relieving D. All of these

Answer 3

C

Question 4

The use of hardened steel for the mating
metal gear appears to give the best results and longer
operational life; the usual hardness is in the range of _____.
A. 300 to 400 BHN C. Over 400 BHN
B. Below 350 BHN D. Over 600 BHN

Answer 4

D

Question 5

The sum of their addendums and
dedendums.
A. Full depth C. Width of space
B. Whole depth D. Working depth

Answer 5

B

Question 6

They are used to change the rotary
motion to the reciprocating motion.
A. Helical gears C. Hypoid gears
B. Herringbone gears D. Rack gears

Answer 6

D

Question 7

To avoid the breakage gear’s teeth, in
the absence of test values, the face width b of spur gear
teeth must be designed in this range.
A. 2.5𝑃𝑐 < b < 4𝑃𝑐 C. 2.5𝑃𝑑 < b < 4𝑃𝑑
B. 2.0𝑃𝑐 < b < 4𝑃𝑐 D. 2.0𝑃𝑑 < b < 4𝑃�

Answer 7

A

Question 8

The reciprocal of diametral pitch
equivalent to the of the pitch diameter to the number of
teeth.
A. Clearance C. Lead
B. Involute D. Module

Answer 8

D

Question 9

In involute teeth, the _________ or the
pressure angle ϕ is the angle between the line of action and
the line of tangent to the pitch circle.
A. Angle of approach C. Angle of recess
B. Angle of obliquity D. Arc of action

Answer 9

B

Question 10

) It is the angle of action to the pitch angle
ratio in gear operation.
A. Contact ratio C. Gear ratio
B. Direct drive ratio D. Velocity ratio

Answer 10

A

Question 11

A type of gear used to change the rotary
motion to reciprocating motion.
A. Helical gear C. Hypoid gear
B. Herringbone gear D. Rack gear

Answer 11

D

Question 12

Spur and rack gears have this part that
have a common definition.
A. Clearance C. Pitch circle
B. Line of action D. Tooth thickness

Answer 12

A

Question 13

It is the angle of action to the pitch angle
ratio in gear operation.
A. Contact ratio C. Gear ratio
B. Direct drive ratio D. Velocity ratio

Answer 13

A

Question 14

It is caused by foreign matter such as grit or
metal particles or by a failure of the oil film at low speed
A. Abrasion C. Scoring
B. Corrosion D. Spalling

Answer 14

a

Question 15

The portion of a gear tooth that projects
above or outside the pitch circle.
A. Addendum C. Tooth Space
B. Dedendum D. Tip Relief

Answer 15

A

Question 16

The radial distance from the ________ to the clearance
circle is called working depth.
A. Addendum circle C. Dedendum circle
B. Pitch circle D. None of these

Answer 16

A

Question 17

The desired quality in gear is:
A. Durability C. Strength
B. Quietness D. All of these

Answer 17

D

Question 18

The lack of backlash in a spur gear
design/operation may result to:
A. Jamming C. Overloading
B. Overheating D. All of these

Answer 18

D

Question 19

What will be the effect in bushing gears
without backlash?
A. Jamming C. Overload
B. Overheating D. All of these

Answer 19

D

Question 20

n involutes teeth, the pressure angle is often
defined as the angle between the line of action and the line
of tangent to pitch circle. It is also known as the _________.
A. Angle of obliquity C. Arc of action
B. Angle of recess D. Helix angle

Answer 20

A

Question 21

The amount by which the width of a tooth
space exceeds the thickness of the engaging tooth on the
pitch circles.
A. Backlash C. Clearance
B. Chordal thickness D. Undercut

Answer 21

A

Question 22

It is necessary to care for errors and inaccuracies in the
spacing and to provide a space between the teeth for a
lubricant, and to allow for the expansion of the teeth with
temperature rise.
A. Backlash C. Fillet Radius
B. Clearance D. Fillet Space

Answer 22

A

Question 23

The surface along the fillet curves or between
the fillet radius of the two adjacent tooth or a gear.
A. Bottom Land C. Flank
B. Fillet D. Top Land

Answer 23

A

Question 24

The surface between the flanks of adjacent teeth.
A. backlash C. Bottom land
B. Flank D. Top land

Answer 24

C

Question 25

The length of arc between the two sides of a gear tooth on the pitch circle. A. Axial Plane C. Circle Thickness B. Chordal Curves D. Helix Angle

Answer 25

C

Question 26

The distance from the center of one tooth of a gear to the center next consecutive tooth measured on the pitch. A. Circular Pitch C. Diametral Pitch B. Circular Pitch D. Module

Answer 26

B

Question 27

Tooth width measurement along the chord at the pitch circle. A. Chord Clearance C. Chordal Length B. Chord Space D. Chordal Thickness

Answer 27

D

Question 28

The arc of action to circular pitch or length of action to base pitch. A. Approach C. Arc of approach B. Arc of action D. Contact ratio

Answer 28

D

Question 29

The depth of tooth space below the pitch circle. A. Dedendum C. Tooth depth B. Full Depth D. Working Depth

Answer 29

A

Question 30

The portion of a gear tooth space that is cut below the pitch circle and is equal to the addendum plus the clearance A. Addendum C. Root B. Dedendum D. Tooth Space

Answer 30

B

Question 31

A circle bounding the bottom of the teeth A. Addendum Circle C. Dedendum Circle B. Addendum Cylinder D. Pitch Circle

Answer 31

C

Question 32

The number of teeth per inch of pitch diameter and which gives some indications of the size of the gear teeth. A. Circular Pitch C. Module B. Diametral Pitch D. Pitch Circle

Answer 32

B

Question 33

The ratio of the number of teeth to the number of mm of pitch diameter equals number of gear teeth to each mm pitch diameter. A. Circular Pitch C. English Module B. Diametral Pitch D. Module

Answer 33

B

Question 34

Actual torque ratio of a gear set divided by its gear ratio. A. Approach ratio C. Contact ratio B. Clearance D. Efficiency

Answer 34

D

Question 35

In gear design, the ratio of pitch diameter, in inches to the number of teeth is called: A. Circular Pitch C. English Module B. Diametral Pitch D. Module

Answer 35

C

Question 36

It is the advance of the tooth in the face width divided by circular pitch. A. Advance ratio C. Profile ratio B. Face contact ratio D. Speed ratio

Answer 36

B

Question 37

The concave portion of tooth profile where it joints the bottom of the tooth filler curve is called: A. Bottom depth C. Fillet curve B. Fillet D. Fillet radius

Answer 37

C

Question 38

For gear cutting which cutter is used? A. End mill cutter C. Plain milling cutter B. Form relieve cutter D. All of the above

Answer 38

B

Question 39

It is the extra tooth in gear, which is used to distribute the wear more evenly. A. Added tooth C. Hunting tooth B. Dummy tooth D. Tooth profile

Answer 39

C

Question 40

The distance a helical gear or worm would thread along its axis in one revolution if it free to move axially is called: A. Land C. Length of action B. Lead D. Length of contact

Answer 40

B

Question 41

The path of contact in involute gears where the force/power is actually transmitted; it is a straight imaginary line passing through the pitch point and tangent to the base circle. C. Front angle C. Pitch point D. Line of action D. Principal reference plane

Answer 41

D

Question 42

The distance between the teeth measured on the pitch surface along a normal to the helix. A. Lead C. Normal circular pitch B. Lead angle D. Pitch

Answer 42

C

Question 43

In case of gears the addendum is given by: A. One module C. 2.16 × module B. π/2 × module D. 1.25 / module

Answer 43

A

Question 44

Which of the following is an example of rectilinear translation? A. Locomotive wheels C. Rack gear B. Piston of an engine D. Jack screw

Answer 44

B

Question 45

A circle the radius of which is equal to the distance from the gear axis to the pitch point. A. Base Circle C. Pitch Circle B. Outside Circle D. Root Circle

Answer 45

C

Question 46

An imaginary circle passing through the points at which the teeth of the meshing gears contact each other. A. Addendum Circle C. Dedendum Circle B. Base Circle D. Pitch Circle

Answer 46

D

Question 47

The size of gear is usually specified by ______. A. Circular pitch C. Pitch diameter B. Diametral pitch D. Pressure angle

Answer 47

C

Question 48

It is known as the diameter of the pitch circle. A. Circular pitch C. Diametral pitch B. Diametral clearance D. Pitch diameter

Answer 48

D

Question 49

In the Lewis equation, the working stress depends on its: A. Load conditions C. Tooth material B. Pitch line velocity D. All of these

Answer 49

D

Question 50

In a pair of gears, _____ is the plane perpendicular to the axial plane and tangent to the pitch surface. A. Pitch C. Pitch Plane B. Pitch Circle D. Pitch point

Answer 50

C

Question 51

If a set of spur gears are made, installed, and lubricated properly, they normally may be subjected to failures like: A. Pitting C. Surface fatigue B. Scouring D. Breakage

Answer 51

A

Question 52

A type of gear used to change the rotary motion to reciprocating motion. A. Helical gear C. Hypoid gear B. Herringbone gear D. Rack gear

Answer 52

D

Question 53

A circle coinciding with a tangent to the bottom of the tooth space. A. Addendum circle C. Pitch circle B. Dedendum circle D. Root circle

Answer 53

D

Question 54

It occurs when the oil film fails but, in this case, the load and speed are so high that the surface metal is melted and the metal is melted and the metal is smeared down the profile. A. Abrasion C. Scoring B. Corrosion D. Spalling

Answer 54

C

Question 55

The effects in bushing gears without backlash are the following, EXEPT: A. Jamming C. Overloading B. Overheating D. Sliding

Answer 55

D

Question 56

The space between the adjacent teeth measured along the pitch circle. A. Clearance C. Space width B. Flank D. Top land

Answer 56

C

Question 57

) It is a surface fatigue of greater extent than pitting that is the flakes are much larger. This type of failure occurs in surface-hardened teeth. A. Abrasion C. Scoring B. Corrosion D. Spalling

Answer 57

d

Question 58

Interchangeability is possible only in this type of gear. A. Bevel gear C. Spur gear B. Helical gear D. Worm gear

Answer 58

C

Question 59

Which of the following is a single measure that combines the external dynamic load of an application with a gear drive’s reliability and operating life? A. Life factor C. Reliability factor B. Ratio factor D. Service factor

Answer 59

C

Question 60

How are gears for watches generally manufactured? A. Die casting C. Power metallurgy process B. Machining on hobber D. Stamping

Answer 60

D

Question 61

) It is the average tangential force on the teeth is then obtained from the horsepower A. Pressure load C. Tangential load B. Separation load D. Total load

Answer 61

C

Question 62

The distance of the tooth, which is equal to the sum of the addendum and dedendum is known as: A. Dedendum C. Whole depth B. Full depth D. Working depth

Answer 62

C

Question 63

The space between the adjacent teeth is called: A. Backlash C. Tooth B. Flank D. Width

Answer 63

D

Question 64

The total depth of a tooth space, equal to addendum plus dedendum. A. Dedendum C. Whole Depth B. Full Depth D. Working Depth

Answer 64

C

Question 65

n case of gears, the addendum is given by: A. 1 × module C. 1.57 x module B. 2.157 x module D. 1.25 x module

Answer 65

A

Question 66

The _____ full depth teeth have the advantages of the greater capacity and less interference trouble. A. 14.5° C. 24° B. 20° D. 30°

Answer 66

B

Question 67

The service factor of a gear may be taken as __ is an electric motor drives a centrifugal blower A. 1 C. 3 B. 2 D. 4

Answer 67

A

Question 68

Buckingham says that mating phenolic gears with steel of BHN less than ____ leads to excessive abrasive wear. A. 200 C. 400 B. 300 D. 500

Answer 68

D

Question 69

For moderate speed of mating gears, the ideal ratio of contact is: A. 1.0 – 1.3 C. 1.25 – 4.0 B. 1.25 – 1.45 D. 1.35 – 1.55

Answer 69

C

Question 70

In designing gears of power transmission, consider and efficiency of _____ as recommended. A. 85% or more C. 96% or more B. 89% or more D. 98% or more

Answer 70

D

Question 71

In usual spur gearing, the: A. Pitch circle and base circle are the same B. Tooth outline are always cycloidal curves C. Tooth outlines are usually involute curves D. Working depth induces clearance

Answer 71

C

Question 72

According to the law of gearing: A. Clearance between mating teeth should be provided B. Dedendum should be equal to 1.57 × module C. Teeth should be involute type D. None of these

Answer 72

D

Question 73

For an evenly and uniform wear on each meshing gear tooth, the ideal design practice is to consider a: A. Hardening of each tooth B. Heat treatment of the gears C. Hunting tooth addition D. Wear resistance alloy addition to tooth gears

Answer 73

C

Question 74

Which of the following is a single measure that combines the external dynamic load of an application with a gear drive's reliability and operating life? A. Life factor C. Reliability factor B. Ratio factor D. Service factor

Answer 74

D

Question 75

In spur gears, the flank of the tooth is: A. The curve forming face and flank. B. The part of the tooth surface lying below the pitch surface C. The surface of the top of the tooth D. The width of the gear tooth measured axially along the pitch surface

Answer 75

B

Question 76

When the pitch line speed is above 8,000 fpm, the teeth should be _______. A. Ground after hardening B. Should be cooled in air C. Should not be quenched after hardening` D. None of these

Answer 76

A

Question 77

The condition for interchangeability of involute gear system that all gears: A. Have the same addendum B. Have the same angle of obliquity C. Have the same pitch D. All of these

Answer 77

D

Question 78

This factor accounts for survival rates other than 99%. C. Life factor C. Reliability factor D. Ratio factor D. Service factor

Answer 78

C

Question 79

What is the backlash of a pinion if Pd = 5? A. 0.075 in C. 0.15 in B. 0.125 in D. 0.175 in

Answer 79

D

Question 80

. The contact ratio for gears is ______. A. Zero C. Less than one B. Greater than one D. Less than/equal to 1

Answer 80

B

Question 81

If the center distance of the mating gears having involute teeth is increased, then the pressure angle ________. A. increases C. fluctuate B. decreases D. remains unchanged

Answer 81

A

Question 82

The portion of the common tangent to the base circles along which contact between mating involutes occurs. A. Line of action C. Pressure angle B. Arc of action D. Friction angle

Answer 82

A

Question 83

The distance between similar sides of adjacent teeth measured on the pitch line is called: A. Pitch diameter C. Axial pitch B. Diametral pitch D. Circular pitch

Answer 83

D

Question 84

Surface endurance limit of gear material is dependent on its: A. Modulus of elasticity C. Elastic strength B. BHN D. Yield strength

Answer 84

B

Question 85

n rack gear, circular pitch is called: A. Diametral pitch C. Pitch diameter B. Linear pitch D. Module

Answer 85

B

Question 86

This is equal to twice the addendum. A. Working depth C. Clearance B. Backlash D. Whole depth

Answer 86

A

Question 87

The meaning of module in a gearing system is: A. Diametral pitch C. Measure B. Circular pitch D. Backlash

Answer 87

C

Question 88

In a pair of gears, spur, or bevel, the smaller of the gears is often called: A. Bull Gear C. Worm B. Gear D. Pinion

Answer 88

D

Question 89

A _________ is a cylinder with teeth resembling those of acme thread. A. Bull gear C. Gear train B. Pinion D. Worm

Answer 89

D

Question 90

The gears on camshaft and crankshaft are known by this term. A. Lining gears C. Aligning gears B. Timing gears D. Tuning gears

Answer 90

B

Question 91

The ________ is equal to the tooth thickness plus the space width. A. Diametral pitch C. Circular pitch B. Pitch diameter D. Pitch circle

Answer 91

C

Question 92

It is standard practice to assume that the thickness of the tooth measured sound the pitch circle is exactly ________ the circle path. A. One-half C. One-third B. One-fourth D. One-fifth

Answer 92

A

Question 93

An imaginary circle passing through the points at which the tooth of the meshing gears contacts each other. A. Diametral pitch C. Circular pitch B. Pitch diameter D. Pitch circle

Answer 93

D

Question 94

A machine that makes gear teeth by means of a reciprocating cutter that rotates slowly with the work. A. Lathe machine C. Gear cutter B. Planer machine D. Gear shaper

Answer 94

D

Question 95

The minimum recommended worm pitch diameter is ¼ in and the maximum is: A. 1 in C. 3 in B. 2 in D. 4 in

Answer 95

B

Question 96

The amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. A. Backlash C. Thickness B. Flank D. Whole depth

Answer 96

A

Question 97

The height of tooth above pitch circle or radial distance between pitch circles and top land of the tooth is called: A. Addendum C. Face width B. Dedendum D. Whole depth

Answer 97

A

Question 98

For moderate speed of mating gears, what is the ideal contact ratio? A. 1.0 to 2.5 C. 2.0 to 4.5 B. 1.25 to 4.0 D. 3.0 to 5.0

Answer 98

B

Question 99

A __________ is one thicker in proportion to its length than the involute tooth. A. 20° Stub tooth C. 14.5° Full depth B. 20° Full depth D. 25° Full depth

Answer 99

A

Question 100

The product of circular pitch and diametral pitch. A. π C. 2π B. π/2 D. π/3

Answer 100

A