Mechanical Engineering Quiz # 42

Which of the following mechanical devices transfers or multiplies load with an application of small effort?

Gears

Shafts

Levers

Bearings

Which of the following coupling consists of only sleeve and a key?

Muff coupling

Flexible coupling

Rigid coupling

Universal coupling

Which of the following bearings cannot take radial loads?

Taper roller bearing

Thrust ball bearing

Angular contact bearing

Deep groove ball bearing

Which of the following forms of thread can transmit power in only one direction?

Acme threads

Trapezoidal threads

Square threads

Buttress threads

Which of the following line is the safest?

Goodman line

Soderberg line

Gerber parabola

Lagrange line

A cotter joint is used to connect two __________ rods.

Co-axial

Perpendicular

Parallel

None of these

The rated life of a bearing varies

Directly as load

Inversely as square of load

Inversely as cube of load

Inversely as fourth power of load

The bending stress in a curved beam is

Zero at the centroidal axis

Zero at the point other than centroidal axis

Maximum at the neutral axis

None of these

In a gear, having Involute teeth, the normal to the Involute is a tangent to the

Base circle

Pitch circle

Addendum circle

Dedendum circle

In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

Thick film

Thin film

Either A or B

None of these

The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

Reducing stress concentration

Ease of manufacture

Safety

Fullering and caulking

Transverse fillet welded joints are designed for

Tensile strength

Compressive strength

Shear strength

Bending strength

In a flange coupling, the bolts are subjected to

Tensile stress

Compressive stress

Shear stress

None of these

A V-belt designated as B 4430 LP has

4430 mm as diameter of small pulley

4430 mm as nominal pitch length

4430 mm as diameter of large pulley

4430 mm as centre distance between pulleys

When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

10 times

5 times

15 times

20 times

When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Have contact at the bottom most of the bearing

Move towards right of the bearing making no metal to metal contact

Move towards right of the bearing making the metal to metal contact

Move towards left of the bearing making metal to metal contact

When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Have contact at the bottom most of the bearing

Move towards right of the bearing making metal to metal contact

Move towards right of the bearing making no metal to metal contact

Move towards left of the bearing making metal to metal contact

The objective of idler pulley in belt drive is to

Decrease the tendency of belt to slip

Increase the power transmission capacity

Increase the wrap angle and belt tension

All the above objectives

The objective of 'crowning' of the flat pulleys of belt drive is to

Prevent the belt from running off the pulley

Increase the power transmission capacity

Increase the belt velocity

Prevent the belt joint from damaging the belt surface

The size of a cam depends upon

Base circle

Pitch circle

Prime circle

Pitch curve

The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Larger

Smaller

Equal

Larger/smaller depending on diameter of spring coil

In a horizontal flat belt drive, it is customary to use

Bottom side of belt as slack side

Top side of belt as slack side

Idler pulley

None of the above

The coefficient of friction between the belt and pulley depends upon the

Material of belt and pulley

Slip of belt

Speed of belt

All of these

Which one of the following loading is considered for the design of axles?

Bending moment only

Twisting moment only

Combined bending moment and twisting moments

Combined action of bending moment, twisting moment and axial thrust

The groove angle of the pulley for rope drive is usually

20°

35°

45°

60°

The valve rod in a steam engine is connected to an eccentric rod by

Cotter joint

Bolted joint

Knuckle joint

Universal coupling

A double strap butt joint (with equal straps) is

Always in single shear

Always in double shear

Either in single shear or double shear

Any one of these

In designing thick cylinders, the equation used is

Lame's equation

Birnie's equation

Clavarinos' equation

All of these

The yield point in static loading is __________ as compared to fatigue loading.

Higher

Lower

Same

None of these

The buckling load will be maximum for a column, if

One end of the column is clamped and the other end is free

Both ends of the column are clamped

Both ends of the column are hinged

One end of the column is hinged and the other end is free