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550+ Machine Design Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

251.

The column splice is used to increase

A. strength of the column
B. cross-sectional area of the column
C. length of the column
D. all of the above
E. Increasing the diameter of threaded portion
Answer» C. length of the column
252.

For which of the following gears noise level is low

A. cast iron gears
B. alloys steel gears
C. non metallic gears
D. none of the above
E. Cast steel
Answer» C. non metallic gears
253.

For steel ultimate strength in tension compared to that in shear is

A. 1?2
B. 3?2
C. Same
D. 2?3
E. 2?1
Answer» B. 3?2
254.

In a ball bearing a sleeve is fixed to

A. To protect bearing against dust etc.
B. Reduce friction
C. Prevent relative axial movement between the shaft and bearing
D. Carry more load
E. Reduce wear
Answer» C. Prevent relative axial movement between the shaft and bearing
255.

Resilience : Strain energy :

A. Increasing the diameter of threaded portion
B. Velocity : Kinetic energy
C. Bulk modulus : Elasticity
D. Potential energy : Kinetic energy
E. Moment : Momentum
Answer» B. Velocity : Kinetic energy
256.

A boiler shell 280 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 MN/m2. The hoop stress will be

A. 155.5 N/m2
B. 60 N/m2
C. 45 N/m2
D. 135 N/m2
E. 180 N/m2
Answer» B. 60 N/m2
257.

The amount of energy required upto fracture is known as

A. Fatigue strength
B. Chrome steel
C. Toughness
D. Damping effect
E. Creep strength
Answer» C. Toughness
258.

Which threads have better fatigue characteristics?

B. Threads cut by taps
C. Threads cut by rolling
D. Increasing the diameter of threaded portion
E. Threads cut on lathe
Answer» C. Threads cut by rolling
259.

The minimum thickness of steel members exposed to weather and accessible for paintng is

A. 8 mm
B. 10 mm
C. Increasing the diameter of threaded portion
D. 6 mm
E. 4 mm
Answer» B. 10 mm
260.

In case of automobile body work the type of welding generally used is

A. Arc welding
B. Submerged are welding
C. Spot welding
D. Gas welding
E. Seam welding
Answer» C. Spot welding
261.

A steel that has been deoxidized with a strong de-oxidizing agent, such as Silicon or Aluminium in order to eliminate a reaction between C and O2 during solidification, is known as

A. Soft steel
B. Kolled steel
C. De-oxidised steel
D. Oxidised steel
E. Anodised steel
Answer» B. Kolled steel
262.

Shear strain energy theory of the failure of a material at elastic limit is due to

A. Rankine
B. Increasing the diameter of threaded portion
C. Haig
D. St. Venant
E. Von Mises
Answer» E. Von Mises
263.

The cam used for high speed engines is

A. Cycloidal
B. Involute
C. Flat
D. Uniform acceleration
E. Tangent
Answer» A. Cycloidal
264.

The Euler's formula for columns is valid for

A. Increasing the diameter of threaded portion
B. large slenderness ratio
C. all slenderness ratios
D. zero slendemess ratio
E. small slenderness ratio
Answer» B. large slenderness ratio
265.

The ratio of maximum shear stress to average shear stress for a circular section is

A. 4
B. 1?4
C. 2
D. 3?4
E. 4?3
Answer» E. 4?3
266.

Which of the following is used as bearing lines

A. Brass
B. Cast iron
C. Babbit metal
D. Cast steel
E. Aluminium
Answer» C. Babbit metal
267.

A bushed pin flexible type coupling is used to join two shafts which

A. Are not in exact alignment
B. Are not coplanar
C. Change position during operation
D. Are inclined
E. None of the above
Answer» A. Are not in exact alignment
268.

For a circular section the ratio of the plastic moment capacity to the yield moment capacity is

A. 1.44
B. 1.1
C. Increasing the diameter of threaded portion
D. 1.86
E. 1.7
Answer» E. 1.7
269.

Snap head rivets are used in

A. Structural work
B. Ship building
C. Aircraft body
D. Any of the above
E. None of the above
Answer» A. Structural work
270.

In oilless bearings

A. There is no external supply of lubricant
B. The lubrication is achieved by adding sulid lubricants
C. Grease is used for lubrication
D. Graphite is used for lubrication
E. None of the above
Answer» A. There is no external supply of lubricant
271.

Maximum principal stress theory is applicable for

A. Elastic materials
B. Plastic materials
C. Ductile materials
D. Brittle materials
E. None of the above
Answer» D. Brittle materials
272.

On a triple thread screw

A. Lead = 2 x pitch
B. Lead = 3 x pitch
C. Lead = pitch
D. Pitch = 3 x lead
E. Pitch = 2 x lead
Answer» B. Lead = 3 x pitch
273.

A pair of straight tooth bevel gears connects a pair of shafts at 90?. The velocity ratio is 3:1. The cone ptich angle of the pinion will be

A. 22.5?
B. 71.6?
C. 30?
D. 18.4?
E. 60?
Answer» D. 18.4?
274.

Key normally used in wrist watch is

A. Kenned key
B. Sunk key
C. Tangent key
D. Woodruff key
E. None of the above
Answer» E. None of the above
275.

Cap screws are

A. Unsed in furniture work only
B. Used on sheet metal work only and are generally self-threading type
C. Used by welding to the structure for relative location of parts
D. Similar to small size bolts except that a great variety of shades of heads are available
E. Generally nickel plated and used where external show is important
Answer» D. Similar to small size bolts except that a great variety of shades of heads are available
276.

Gears preferred for minimum axial thrust are

A. Helical gears
B. Worm gears
C. Hypoid gears
D. Herring bone gears
E. Any of the above
Answer» D. Herring bone gears
277.

In case of springs in order to achieve greater load carrying capacity when the outer diameter is limited

A. Square section is used
B. Elliptical section is used
C. Rectangular section is used
D. Concentric springs are used
E. None of the above
Answer» D. Concentric springs are used
278.

In the Laminated springs, the flat plates of different lengths are provided for

A. Reducing deflection
B. Appearance
C. Economy
D. Equal distribution of stress
E. Reducing bulk
Answer» D. Equal distribution of stress
279.

The most common material for the balls and races of ball bearings is

A. High carbon steel
B. High speed steel
C. high chromium steel
D. none of the above
E. Cast steel
Answer» C. high chromium steel
280.

A key seldom fails in

A. Increasing the diameter of threaded portion
B. tearing
C. shearing
E. crushing
Answer» B. tearing
281.

A suspended body is to be struck heavily without producing any reaction at the support. It should be hit at

A. Centre of spin
B. Centre of gravity
C. Metacentre
D. Centroid
E. Centre of percussion
Answer» E. Centre of percussion
282.

Beams composed of more than one material, regidly connected so as to behave as one piece are known as

A. determinate beams
B. inditerminate beams
C. Increasing the diameter of threaded portion
D. composite beams
E. compound beams
Answer» D. composite beams
283.

Low pressure angle on gears is likely to result in

A. Weaker teeth
B. Abrasion
C. Wear
D. Pitting
E. Stronger teeth
Answer» A. Weaker teeth
284.

The trunions of a mixing machine have an effective length of 30 cm and the weight coming on each trunion is 1250 kg. If the fibre stress is not to exceed 350 kg/sq-cm the diameter of the trunions should be

A. 6 cm
B. 8 cm
C. 12 cm
D. 4 cm
E. 10 cm
Answer» B. 8 cm
285.

The holding power of a saddle key is due to

A. Torsion
B. Shear force
C. Compressive force
D. Friction force
E. Tensile force
Answer» D. Friction force
286.

In order to minimise jerks, the type of cam used is

A. Cycloidal
B. Hyperbolic
C. S.H.M.
D. Cylindrical
E. Parabolic
Answer» A. Cycloidal
287.

Which of the following bearing will have least coefficient of friction?

A. Cylindrical foller bearing
B. Tapered bearing
C. Single ball bearing
D. Thrust ball bearing
E. Self-aligning bearing
Answer» B. Tapered bearing
288.

Abrasion wear of gear tooth occurs due to

A. Poor lubrication
B. Fatigue
C. Presence of foreign particles
D. Excessive load
E. Any of the above
Answer» C. Presence of foreign particles
289.

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw is called

A. castle nut
B. jam nut
C. sawn nut
D. ring nut
E. Increasing the diameter of threaded portion
Answer» D. ring nut
290.

The angle through which a gear turns from the beginning of contact of a pair of teeth until the contact reaches the pitch point, is known as

A. Angle of approach
B. Angle of action
C. Angle of contact
D. Pressure angle
E. Approach angle
Answer» A. Angle of approach
291.

The surface endurance limit of gear material is dependent on its

A. Toughness
B. Surface hardness
C. Surface lubrication
D. Elastic strength
E. Coefficient of friction
Answer» B. Surface hardness
292.

Yield point in static loading as compared to that in fatigue loading is

A. Depends on composition of material
B. Same
C. Lower
D. Higher
E. Depends on loading rate
Answer» D. Higher
293.

Slenderness ratio of the lacing bar for compression member should not exceed

A. 125
B. Increasing the diameter of threaded portion
C. 100
D. 175
E. 145
Answer» E. 145
294.

The value of load factor which accounts for margin of safety in plastic design for gravity loads is about

A. 1.85
B. 2.15
C. Increasing the diameter of threaded portion
D. 1.25
E. 1.55
Answer» A. 1.85
295.

The purpose of providing multiple collars on a flat collar pivot bearing is to

A. Increase frictional resistance
B. Establish self-substaining bearing condition
C. Distribute the frictional load because of limiting frictional resistance
D. Distribute the axial load becase of limiting bearing pressure on a collar
E. None of the above
Answer» D. Distribute the axial load becase of limiting bearing pressure on a collar
296.

Bolted joints often fail in

A. tension only
B. compresson only
C. torsion only
D. Increasing the diameter of threaded portion
E. shear only
Answer» A. tension only
297.

A series of continuous spot welds

A. dot matrix
B. Increasing the diameter of threaded portion
C. stitch weld
D. butt weld
E. seam weld
Answer» E. seam weld
298.

A shaft coupling should

A. hold the two shafts in perfect alignment
B. have no projecting parts
C. have all the above characteristics
D. Cast steel
E. transmit full power of the shaft
Answer» C. have all the above characteristics
299.

Eye bolts are used for

A. Locking devices
B. Transmission of power
C. Absorption of shocks and vibrations
D. Lifting and transporting heavy pieces
E. None of the above
Answer» D. Lifting and transporting heavy pieces
300.

The most common material used for rivets is

A. cast iron
B. malleable cast iron
C. mild steel
D. none of the above
E. Cast steel
Answer» C. mild steel

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