# Machine Design MCQs Latest – Competitive Mechanical Engineering MCQs

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#### Machine Design MCQs Latest – Competitive Mechanical Engineering MCQs

This post is comprising of latest “Machine Design MCQs Latest – Competitive Machine Design MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.

#### Latest Mechanical Engineering MCQs

By practicing these MCQs of Mechanical Engineering MCQs – Machine Design Mcqs, an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to Machine Design Mcqs“. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Latest Machine Design Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.

#### Latest Machine Design Mcqs

The most occurred mcqs of Machine Design in past papers. Past papers of Machine Design Mcqs. Past papers of Machine Design Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Machine Design Mcqs. The Important series of Machine Design Mcqs are given below:

Taper usually provided on cotter is_________________?

A. 1 in 10
B. 1 in 5
C. 1 in 24
D. 1 in 40
E. 1 in 50

The draw of cotter need not exceed_________________?

A. 3 mm
B. 10 mm
C. 5 mm
D. 20 mm
E. 25 mm

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

A. bolted joint
B. cotter joint
C. kunckle joint
D. universal coupling
E. gib and cotter joint

Taper on the cotter and slot is provided_________________?

A. on none of the sides
B. on one side only
C. on both the sides
D. may be provided anywhere
E. none of the above

Silver-based solder is used for__________________?

A. soft soldering
B. brazing
C. flaring
D. fusion welding
E. none of the above

In order to permit the thermal expansion/contraction of tubing, it should be______________?

A. honed
B. crimped
C. flared
D. bent
E. none of the above

The strap end of a connecting rod of steam engine is joined by_________________?

A. gib of cotter joint
B. spigot socket cotter joint
C. sleeve and cotter joint
D. knuckle joint
E. universal coupling

The shear plane in case of bolts should_________________?

A. be parallel to axis of bolt
B. be across threaded portion of shank
C. be normal to threaded portion of shank
D. never be across the threaded portion
E. none of the above

When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads___________________?

A. shear
B. tension
C. compression
E. all of the above

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

A. ease of manufacture
B. reducing stress concentration
C. safety
D. fullering and caulking
E. all of the above

Which of the following pipe joints would be suitable for pipes carrying steam_____________?

B. flanged
C. bell and spigot
D. expansion
E. compression

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

A. larger
B. equal
C. smaller
D. larger/smaller depending on diameter of spring coil
E. unpredictable

Spring stiffness is__________________?

A. its ability to absorb shocks
B. load required to produce unit deflection
C. its capability of storing energy
D. ratio of coil diameter to wire diameter
E. none of the above

#### Refrigeration And Air Conditioning MCQs

When a close coiled helical spring is compressed, its wire is subjected to________________?

A. tension
B. compression
C. shear
D. all of the above
E. none of the above

Belt slip may occur due to________________?

A. loose belt
C. driving pulley too small
D. all of the above
E. none of the above

If two springs are in parallel then their overall stiffness will be_______________?

A. same
B. half
C. double
D. unpredictable
E. none of the above

Antifriction bearings are__________________?

A. hydrodynamic bearings
B. sleeve bearings
C. thin lubricated bearings
D. ball and roller bearings
E. none of the above

The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?

A. 0.1 micron
B. 0.01 micron
C. 1 micron
D. 10 microns
E. 25 microns

Oil in journal bearing should be applied at the point where load is________________?

A. nil or lightest
B. average
C. maximum
D. any one of the above
E. unpredictable

In oilness bearings________________?

A. the oil film is maintained by supplying oil under pressure
B. the oil film pressure is generated only by the rotation of the journal
C. do not require external supply of lubricant
D. grease required to be applied after some intervals
E. none of the above

Three different weights fall from a certain height under vacuum. They will take______________?

A. same time to reach earth
B. unpredictable
C. times inversely proportional to weight to reach earth
D. times proportional to weight to reach earth
E. none of the above

In standard taper roller bearings, the angle of taper of outer raceway is___________________?

A. 8°
B. 5°
C. 15°
D. 25°
E. 40°

Whether any core is required in wire ropes________________?

A. yes
B. sometimes
C. no
D. rarely
E. very often

Basic shaft is one__________________?

A. whose upper deviation is zero
B. does not exist
C. whose lower as well as upper deviations are zero
D. whose lower deviation is zero
E. none of the above

In composite or reverse laid ropes___________________?

A. direction of twist of wires in strands is opposite to the direction of twist of strands
B. wires are not twisted
C. wires in two adjacent strands are twisted in opposite direction
D. direction of twist of wires and strands are same
E. none of the above

I.S. specifies following total number of grades of tolerances__________________?

A. 18
B. 20
C. 16
D. 22
E. 14

Allen bolts are___________________?

B. self locking bolts
C. used in aircraft application
D. provided with hexagonal depression in head
E. uniform strength bolts

The connecting rod bolts are tightened up so that tightening stress _________________?

A. is 50% of yield point
B. approaches yield point
C. is just sufficient to hold parts together
D. is about yield point divided by safety factor
E. none of the above

If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?

A. acme
B. square
C. buttress
D. BSW
E. metric

The shock absorbing capacity of a bolt can be increased by___________________?

A. increasing shank diameter
B. tightening it properly
C. grinding the shank
D. using washer
E. making shank diameter equal to core diameter of thread

The connecting rod bolts are tightened up with initial tension greater than the external load so that___________________?

A. bolts are weakest elements
B. joint may not open up
C. the resultant load on the bolt would not be affected by the external cyclic load
D. bolts will not loosen during service
E. none of the above

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?

B. shank
C. in the middle
E. anywhere in the bolt

The resultant axial load on a bolt depends on_______________?

B. initial tension
C. relative elastic yielding (springness) of the bolt and the connected member
D. A. and B. above
E. A, B. and C. above

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?

A. 0.4 times
B. 0.7 times
C. 0.6 times
D. 0.8 times
E. 0.9 times the normal diameter of bolt

Basic hole is one_________________?

A. does not exist
B. whose lower deviation is zero
C. whose lower as well as upper deviations are zero
D. whose upper deviation is zero
E. none of the above

#### Production Technology Mcqs

If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________?

A. diameter of bolt
B. 1.25 x diameter of bolt
C. 0.75 x diameter of bolt
D. 1.5 x diameter of bolt
E. 0.5 x diameter of bolt

In V-belt drive, belt touches______________?

A. both at bottom and sides
B. at sides only
C. at bottom
D. could touch anywhere
E. none of the above

In cross or regular lay ropes_________________?

A. direction of twist of wires in strands is opposite to the direction of twist of strands
B. wires are not twisted
C. wires in two adjacent strands are twisted in opposite direction
D. direction of twist of wires and strands are same
E. none of the above

The rated life of a bearing varies___________________?

A. inversely as square of load
C. inversely as cube of load
D. inversely as fourth power of load
E. none of the above

In hydrostatic bearings ____________________?

A. the Oil film pressure is generated only by the rotation of the journal
B. the oil film is maintained by supplying oil under pressure
C. grease is used for lubrication
D. do not require external supply of lubricant
E. none of the above

If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?

A. ZN/p
B. Z/pN
C. p/ZN
D. N/Zp
E. Zp/N

In hydrodynamic bearings_____________________?

A. the oil film pressure is generated only by the rotation of the journal
B. do not require external supply of lubricant
C. the oil film is maintained by supplying oil under pressure
D. grease is used for lubrication
E. none of the above

Aircraft body is usually fabricated by_________________?

A. precasting
B. welding
C. rivetting
D. casting
E. unconventional methods

If a spring is cut down into two springs, the stiffness of cut springs will be _________________?

A. same
B. half
C. double
D. unpredictable
E. none of the above

When two springs are in series (having stiffness K), the equivalent stiffness will be________________?

A. 2K
B. K/2
C. K
D. KIA
E. UK

Form coefficient of spring is _____________________?

A. load required to produce unit deflection
B. ratio of coil diameter to wire diameter
C. its capability of storing energy
D. concerned With strength of wire of spring
E. nothing

Spring index is___________________?

A. ratio of coil diameter to wire diameter
B. its capability of storing energy
C. load required to produce unit deflection
D. indication of quality of spring
E. nothing

The piston rod of a steam engine is usually connected to the cross head by means of__________________?

A. kunckle joint
B. bolted joint
C. cotter joint
D. universal joint
E. universal coupling

Gear box is used___________________?

A. for speed reduction
B. to produce torque
C. to obtain variable speeds
D. to increase efficiency of system
E. to damp out vibrations

Castle nut is a locking device in which__________________?

A. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
C. a slot is cut partly is middle of nut and then slot reduced by tightening a screw
D. through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end
E. none of the above.

A backing ring is used inside the pipe joint when making a___________________?

A. butt weld
B. sleeve weld
C. fillet weld
D. socket weld
E. tube weld

A tube has the following advantage over pipe_________________?

A. greater shock absorption
B. lighter and easier to handle
C. smoother inside walls
D. all of the above
E. none of the above

For tight leakage joints, following type of thread is best suited ____________________?

A. buttress
B. metric
C. square
D. acme

The function of cutting oil when threading a pipe is to___________________?

A. provide cooling action
B. help remove chips
C. lubricate the dies
D. all of the above
E. none of the above

#### Engineering Materials Mcqs

Split nut is a locking device in which_________________?

A. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
B. a slot is cut partly in middle of nut and then slot reduced by tightening screw
C. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
D. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
E. none of the above

A bench vice has following type of threads____________________?

A. square
B. metric
C. buttress
D. acme
E. BSW

Applications in which stresses are encountered in one direction only uses following type of threads____________________?

A. acme
B. buttress
C. metric
D. square
E. BSW

If threads on a bolt are left hand, threads on nut will be_____________________?

A. could be left or right hand
B. left hand with same pitch
C. right hand with same pitch
D. right hand with fine pitch
E. left hand with fine pitch

Elastic nut is a locking device in which__________________?

A. one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
C. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
D. a slot is cut partly in middle of nut and then slot reduced by tightening a screw
E. none of the above

Turn buckle has____________________?

A. left hand threads on both ends
B. right hand threads on bout ends
C. left hand threads on one end and right hand threads on other end

A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?

A. wood-ruff key
D. feather key

A key capable of tilting in a recess milled out in a shaft is known as______________________?

A. wood-ruff key
C. feather key

Buttress threads are usually found on____________________?

A. feed mechanisms
B. screw cutting lathes
C. spindles of bench vices
D. screw jack
E. railway carriage couplings

Jam nut is a locking device in which _____________________?

A. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
C. a slot is cut partly in middle of nut and then slot reduced by tightening a screw
D. 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
E. none of the above

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

A. 0.50
B. 0.25
C. 0.2
D. 0.6
E. 0.75

Which of the following is a permanent fastening ?

A. keys
B. bolts
C. cotters
D. rivets
E. screws

Rivets are generally specified by_______________?

A. length of rivet
B. thickness of plates to be riveted
D. nominal diameter
E. all of the above

The designation M 33 x 2 of a bolt means___________________?

A. metric threads with cross-section of 33 mm
B. metric threads of 33 nos in 2 cm.
C. metric threads of 33 mm outside diameter and 2 mm pitch
D. bolt of 33 mm nominal diameter having 2 threads per cm
E. none of the above

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