For internal gears having a 20° pressure angle and full depth teeth, the difference between the number of teeth in a gear and pinion should not be less than ______.

Zero bevel gears of 20 degrees angle should have a pinion either no less than ______.

______ are machine elements that transmit motion by means of successively engaging teeth.

Height of tooth above pitch circle or the distance between the pitch circle and the top of the tooth.

The circle that bounds the outer ends of the teeth.

Arc of the pitch circle through which a tooth travels from the first point of contact with the mating tooth to the pitch point.

Is the angle through which the gear turns from the time a given pair of teeth are in contact at the pitch point until they pass out the mesh.

Is the angle through which the gear turns from the time a particular pair of teeth come into contact until they go out the contact.

Is the angle through which the gear turns from the time a particular pair of teeth come into contact until they are in contact at the pitch point.

Arc of the circle through which a tooth travels from the point of contact with the mating tooth to the pitch point.

The ratio of the arc of approach to the arc of action.

In a pair of gears, it is the plane that contains the two axes; in a single gear, it may be any plane containing the axis and the given point.

Arc of the pitch circle through which a tooth travels from its contact with the mating tooth at the pitch point to the point where the contact ceases.

The amount by which the width of the tooth space exceeds the thickness of the engaging tooth on the pitch circles.

The circle from which an involute tooth is generated or developed.

The angle, at the base cylinder of an involute gear, that the tooth makes with the gear axis.

In an involute gear, it is the pitch on the base circle or along the line of action.

Is the base pitch in the normal plane.

Is the base pitch in the axial plane.

The distance between the parallel axes of spur gears and parallel helical gears, or between the crossed axes of helical gears and worm gears.

In a worm gear, this is a plane perpendicular to the gear axis and contains the common perpendicular of the gear and the worm axis.

Length of the chord subtended by the circular thickness arc.

The height from the top of the tooth to the chord subtending the circular-thickness arc.

Length of the arc of the pitch circle between the centers or other corresponding points of the adjacent teeth.

The smallest diameter on a gear tooth with which the mating gear makes contact.

The maximum compressive stress within the contact area between mating gear tooth profiles.

The lowest permissible water level shall be at a point ______ of the height of the shell.

Is the circular pitch in the normal plane.

Also known as tooth thickness or the length of the arc between the two sides of a gear tooth, on the pitch circles unless otherwise specified.

The amount by which the dedendum exceeds the addendum of the mating tooth.

The smallest diameter on a gear tooth with which the mating gear makes.

The ratio of the arc of action to the circular pitch.

Is the curve that satisfy the law of gearing.

The curved formed by the path of a point on a circle as it rolls along a straight line.

The depth of tooth space below the pitch circle or the radial dimension between the pitch circle and the bottom of the tooth space.

Is also known as root circle or is the circle that bounds the bottoms of the teeth.

The ratio of the number of teeth to the number of millimeters of pitch diameter.

Is the diametral pitch calculated in the normal plane and is equal to the pitch divided by the cosine of helix angle.

That portion of the face width that actually comes into contact with mating teeth, as occasionally one member of a pair of gears may have a greater face width than the other.

The actual torque ratio of a gear set divided by its gear ratio.

When it rolls along the outer side of another circle.

A gear with teeth on the outer cylindrical surface.

That surface of the tooth which is between the pitch circle to the top of the tooth.

The length of the teeth in axial plane.

Is the surface of the tooth between the pitch cylinder and the addendum cylinder.

The concave portion of the tooth profile where it joins the bottom of the tooth space. The approximate radius of this curve is called the fillet radius.

The maximum tensile stress in the gear tooth fillet.

That surface which is between the pitch circle and the bottom land.

The surface of the tooth between the pitch and root cylinders is

The number of teeth in the gear divided by the number of teeth in the pinion.

The angle that a helical gear tooth makes with the gear axis.

The effective face width of a helical gear divided by the gear axial pitch.

When it rolls along the inner side of another circle.

The diameter of a circle coinciding with the tops of the teeth on an internal gear.

A gear with teeth on the inner cylindrical surface.

The curved formed by the path of a point on a straight line, called the generatrix, as it rolls along a convex base curve.

Is the top surface of the tooth.

Is the surface of the gear between the fillets of adjacent teeth.

The distance a helical gear or worm would thread along its axis one revolution of it were free to move axially.

The path of contact in involute gears. It is a straight line passing through the pitch point and the tangent to the base circles.

The distance on an involute line of action through which the point of contact moves during the action of the tooth profile.

Is the ratio of pitch diameter in millimeter to the number of teeth, mm.

A plane normal to the tooth surfaces at a point of contact, and perpendicular to the pitch plane.

The diameter of the outside circle.

The distance between similar, equally spaced tooth surfaces, in a given direction and along a given curve or line.

Is the angle subtended by the arc on the pitch circle equal in the length to the circular pitch.

The diameter of the pitch circle.

A circle the radius of which is equal to the distance from the gear axis to the pitch point.

Of meshing gears is the point of tangency of the pitch circle.

In a pair of gears, it is the plane perpendicular to the axial plane and tangent to the axial plane and tangent to the pitch surfaces.

Any plane perpendicular to a gear axis.

The angle between the tooth profile and a radical line at its pitch point. In involute teeth, the angle between the line of action and the line tangent to the pitch circle.

These are the pitch plane, axial plane, and traverse plane, all intersect at a point and mutually perpendicular.

A gear with teeth spaced along a straight line, and suitable for straight line motion.

The angle subtended at the center of the base circle from teeth origin of an involute to the point of tangency of the generatrix from any point on the same involute.

A circle coinciding with or tangent to the bottoms of the tooth spaces.

A plane tangent to the surfaces at a point or line of contact.

An arbitrary modification of a tooth profile whereby a small amount of material is removed near the tip of the gear tooth.

The width of tooth measured along the pitch circle.

The space between the teeth measured along the pitch circle.

The actual width dimensions of a gear blank.

Is the radial distance from the addendum circle to the working depth circle.

The length l of a column divided by r is one of the terms in the equation for the buckling of a column under compression loads. What does r stand for in the $$l/r$$ ratio?

All of the following are nondestructive tests except

The machinery operation whereby done with the work accurately fastened has a reciprocating (forward and backward) motion and the tool head is stationary.

Finding the resultant of two or more forces is called:

The capacity of metal to withstand load without breaking is:

Outstanding safety record contributes to:

A type of coupling that allows slight amount of torsional/angular flexibility due to introduction with some elastic material cylindrically wrapped around the bolts in the flange.

In a uniformly loaded beam, the maximum vertical shearing force occurs

Copper and most of its alloy can be hardened by:

What happens to a drill if the operating speed is too fast?

All of the following are destructive hardness tests except

The section modulus of a rectangle of base “b” and height “h” about its base is:

A material that should be avoided in constructing wood pattern: