Engineering/Machine Design Mcq set 02 Sample Test,Sample questions

Question:
 A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

1.Hydrostatic lubricated bearing

2.Hydrodynamic lubricated bearing

3. Boundary lubricated bearing

4.Zero film bearing


Question:
 A tap bolt

1.Has a head on one end and a nut fitted to the other

2.Has head at one end and other end fits into a tapped hole in the other part to be joined

3.Has both the ends threaded

4.Has pointed threads


Question:
 A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as

1.Woodruff key

2.Feather key

3.Flat saddle key

4. Gib head key


Question:
 At low temperatures (say 75°C) the notched bar impact value of steel

1.Increases markedly

2.Decreases markedly

3.Remain same

4.Depends on heat treatment carried out


Question:
 For applications involving high stresses in one direction only the following type of thread would be best suited

1. ISO metric thread

2.Acme thread

3.Square thread

4.Buttress thread


Question:
 If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

1.P1 - P2

2.P1 + P2

3.⅟2 × (P1 + P2)

4. [⅟2 × (P1 + P2)] + Pc


Question:
 If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

1.0.2

2.0.25

3.0.50

4.0.6


Question:
 Rivets are generally specified by

1.Thickness of plates to be riveted

2.Length of rivet

3. Diameter of head

4.Nominal diameter


Question:
 Shear stress theory is applicable for

1. Ductile materials

2. Brittle materials

3.Elastic materials

4.All of the above


Question:
 The dedendum circle diameter is equal to (where φ = Pressure angle)

1.Pitch circle diameter × cosφ

2.Addendum circle diameter × cosφ

3.Clearance circle diameter × cosφ

4.Pitch circle diameter × sinφ


Question:
 The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

1. 2/8

2.8/2

3.4/8

4. 8/4


Question:
 The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

1. 0.45

2.0.55

3.0.65

4.0.75


Question:
 The function of a washer is to

1.Provide cushioning effect

2.Provide bearing area

3.Absorb shocks and vibrations

4.Provide smooth surface in place of rough surface


Question:
 The included angle in unified of American National threads is

1. 60°

2.55°

3.47°

4.29°


Question:
 Turn buckle has

1.Right hand threads on bout ends

2.Left hand threads on both ends

3.Left hand threads on one end and right hand threads on other end

4.No threads


Question:
A bolt

1.Has a head on one end and a nut fitted to the other

2.Has head at one end and other end fits into a tapped hole in the other part to be joined

3.Has both the ends threaded

4.Is provided with pointed threads


Question:
A machine part subjected to _________ is called a strut.

1.An axial compressive force

2.An axial tensile force

3.A tangential force

4.Any one of these


Question:
A stud

1.Has a head on one end and a nut fitted to the other

2. Has head at one end and other end fits into a tapped hole in the other part to be joined

3.Has both the ends threaded

4.Has pointed threads


Question:
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

1.Angular bevel gears

2.Mitre gears

3.Crown Bevel gears

4.Internal bevel gears


Question:
An alien bolt is

1.Self locking bolt

2.Same as stud

3. Provided with hexagonal depression in head

4.Used in high speed components


Question:
Ball bearing type screws are found in following application

1.Screw jack

2. Aeroplane engines

3.Crane

4.Steering mechanism


Question:
Buttress threads are usually found on

1.Screw cutting lathes

2.Feed mechanisms

3.Spindles of bench vices

4.Railway carriage couplings


Question:
Cap screws are

1. Similar to small size tap bolts except that a greater variety of shapes of heads are available

2. Slotted for a screw driver and generally used with a nut

3.Used to prevent relative motion between parts

4.Provided with detachable caps


Question:
Fibrous fracture occurs in

1. Ductile material

2.Brittle material

3.Elastic material

4. Hard material


Question:
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

1.8

2.6

3.4

4.10


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

1.Bottom side of belt as slack side

2.Top side of belt as slack side

3.Idler pulley

4.None of the above


Question:
In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to

1.d

2.1.25 d

3.1.5 d

4.1.75 d


Question:
Jam nut is a locking device in which

1.One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

2.A slot is cut partly in middle of nut and then slot reduced by tightening a screw

3.A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

4.Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end


Question:
Machine screws are

1. Similar to small size tap bolts except that a greater variety of shapes of heads are available

2.Slotted for a screw driver and generally used with a nut

3.Used to prevent relative motion between two parts

4.Similar to stud


Question:
The edges of a boiler plate are bevelled to an angle of

1. 30°

2.45°

3.60°

4.80°


Question:
The pitch of threads on a Jock nut in comparison to pitch of nut is

1. Same

2.Coarser

3.Finer

4.Very fine


Question:
The stress induced in the belt is,

1.Tensile stress

2.Compressive stress

3.Direct shear stress

4. Torsional shear stress


Question:
The taper on cotter varies from

1.1 in 24 to 1 in 20

2.1 in 15 to 1 in 10

3.1 in 32 to 1 in 24

4.1 in 48 to 1 in 24


Question:
Transverse fillet welded joints are designed for

1.Tensile strength

2.Compressive strength

3. Shear strength

4.Bending strength


Question:
When the belt is transmitting maximum power,

1.The tension in tight side is twice the centrifugal tension

2.The tension in slack side is equal to the centrifugal tension

3.The tension in tight side is thrice the centrifugal tension

4.None of the above


Question:
When the belt is transmitting maximum power, the belt speed should be
(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

1.√(Pmax / 2m)

2. √(Pmax / 3m)

3.√(Pmax / m)

4.√(3m /Pmax)


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

1.Have contact at the bottom most of the bearing

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

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

4.Move towards left of the bearing making metal to metal contact


Question:
Which of the following is a permanent fastening?

1. Bolts

2.Keys

3.Cotters

4.Rivets


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