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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 951. |
A key capable of tilting in a recess milled out in a shaft is known as |
| A. | wood-ruff key |
| B. | feather key |
| C. | flat saddle key |
| D. | gib head key |
| Answer» B. feather key | |
| 952. |
The pitch of threads on a Jock nut in comparison to pitch of nut is |
| A. | same |
| B. | coarser |
| C. | finer |
| D. | very coarse |
| Answer» B. coarser | |
| 953. |
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 slot is cut partly in middle of nut and then slot reduced by tightening a screw |
| C. | 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 |
| 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 |
| Answer» B. a slot is cut partly in middle of nut and then slot reduced by tightening a screw | |
| 954. |
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 |
| A. | 1.25 d |
| B. | 1.5 d |
| C. | 1.75 d |
| D. | 2 d. |
| Answer» C. 1.75 d | |
| 955. |
Which of the following is a permanent fastening ? |
| A. | bolts |
| B. | keys |
| C. | cotters |
| D. | rivets |
| Answer» E. | |
| 956. |
The edges of a boiler plate are bevelled to an angle of |
| A. | 30° |
| B. | 45° |
| C. | 60° |
| D. | 80° |
| Answer» E. | |
| 957. |
The designation M 33 x 2 of a bolt means |
| A. | metric threads of 33 nos in 2 cm. |
| B. | metric threads with cross-section of 33 mm |
| C. | metric threads of 33 mm outside diameter and 2 mm pitch |
| D. | bolt of 33 mm nominal diameter having 2 threads per cm |
| Answer» D. bolt of 33 mm nominal diameter having 2 threads per cm | |
| 958. |
A self locking screw has |
| A. | fine threads |
| B. | coarse threads |
| C. | coefficient of friction > tangent of load angle |
| D. | hole for inserting split pin |
| Answer» D. hole for inserting split pin | |
| 959. |
An alien bolt is |
| A. | self locking bolt |
| B. | same as stud |
| C. | provided with hexagonal depression in head |
| D. | used in high speed components |
| Answer» D. used in high speed components | |
| 960. |
For applications involving high stresses in one direction only the following type of thread would be best suited |
| A. | ISO metric thread |
| B. | acme thread |
| C. | square thread |
| D. | buttress thread |
| Answer» E. | |
| 961. |
A tap bolt |
| A. | has a head on one end and a nut fitted to the other |
| B. | has head at one end and other end fits into a tapped hole in the other part o be joined |
| C. | has both the ends threaded |
| D. | has pointed threads |
| Answer» C. has both the ends threaded | |
| 962. |
Shear stress theory is applicable for |
| A. | ductile fnaterials |
| B. | brittle materials |
| C. | elastic materials |
| D. | all of the above |
| Answer» B. brittle materials | |
| 963. |
Maximum principal stress theory is applicable for |
| A. | ductile materials |
| B. | brittle materials |
| C. | elastic materials |
| D. | all of the above |
| Answer» C. elastic materials | |
| 964. |
If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be |
| A. | lOVZ |
| B. | 10VZtol5Vd |
| C. | 15Vdto20VZ |
| D. | 20Vdto30Vd |
| Answer» E. | |
| 965. |
The crest diameter of a screw thread is same as |
| A. | major diameter |
| B. | minor diameter |
| C. | pitch diameter |
| D. | core diameter |
| Answer» B. minor diameter | |
| 966. |
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of |
| A. | 0.25 |
| B. | 0.45 |
| C. | 0.55 |
| D. | 0.75 |
| Answer» E. | |
| 967. |
For steel, the ultimate strength in shear as compared to ultimate strength in tension is |
| A. | same |
| B. | 2/1 |
| C. | 2/2 |
| D. | 2/3 |
| Answer» E. | |
| 968. |
Resistance to fatigue of a material is measured by |
| A. | Youngs modulus |
| B. | coefficient of elasticity |
| C. | elastic limit |
| D. | endurance limit |
| Answer» E. | |
| 969. |
Which is correct statement ? |
| A. | a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron |
| B. | a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel |
| C. | both will be equally rigid |
| D. | which one is rigid will depend on several other factors |
| Answer» C. both will be equally rigid | |
| 970. |
Which process will increase the fatigue duration of parts ? |
| A. | finishing and polishing |
| B. | shot-peening |
| C. | decarburisation |
| D. | electroplating |
| Answer» C. decarburisation | |
| 971. |
Residual stress in materials |
| A. | acts when external load is applied |
| B. | becomes zero when external load is removed |
| C. | is independent of external loads |
| D. | is always harmful |
| Answer» D. is always harmful | |
| 972. |
Yield point in fatigue loading as compared to static loading is |
| A. | same |
| B. | higher |
| C. | lower |
| D. | depends on other factors |
| Answer» D. depends on other factors | |
| 973. |
Cold working |
| A. | increases the fatigue strength |
| B. | decreases the fatigue strength |
| C. | decreases the fatigue strength |
| D. | alone has no influence on fatigue strength |
| Answer» B. decreases the fatigue strength | |
| 974. |
In testing a material for endurance strength, it is subjected to |
| A. | static load |
| B. | dynamic load |
| C. | impact load |
| D. | completely reversed load. |
| Answer» E. | |
| 975. |
Which is correct statement ? Stress concentration in cyclic loading is |
| A. | very serious in brittle materials and less serious in ductile materials |
| B. | very serious in ductile materials and less serious in brittle materials |
| C. | equally serious in both types of materials |
| D. | seriousness would depend on other factors |
| Answer» D. seriousness would depend on other factors | |
| 976. |
In Vicker's hardness testing, the pyramid indentor apex is |
| A. | 40° |
| B. | 122° |
| C. | 136° |
| D. | 152° |
| Answer» D. 152° | |
| 977. |
Which is correct statement ? Stress concentration in static loading is |
| A. | very serious in brittle materials and less serious in ductile materials |
| B. | very serious in ductile materials and less serious in ductile materials |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» B. very serious in ductile materials and less serious in ductile materials | |
| 978. |
Coaxing is the procedure of increasing |
| A. | metal strength by cycling |
| B. | metal hardness by surface treatment |
| C. | metal resistance to corrosion by coating |
| D. | fatigue limit by overstressing the metal by successively increasing loadings |
| Answer» E. | |
| 979. |
Which of the following is not correct procedure to increase the fatigue limit |
| A. | cold working |
| B. | shot peening |
| C. | surface decarburisation |
| D. | under-stressing |
| Answer» D. under-stressing | |
| 980. |
Stress concentration in cyclic loading is more serious in |
| A. | ductile materials |
| B. | brittle materials |
| C. | equally serious in both cases |
| D. | depends on other factors |
| Answer» B. brittle materials | |
| 981. |
Stress concentration in static loading is more serious in |
| A. | ductile materials |
| B. | brittle materials |
| C. | equally serious in both cases |
| D. | depends on other factors |
| Answer» C. equally serious in both cases | |
| 982. |
The fatigue life of a part can be improved by |
| A. | electroplating |
| B. | polishing |
| C. | coating |
| D. | shot peening |
| Answer» E. | |
| 983. |
The endurance limit of a material with finished surface in comparison to rough surface is |
| A. | more |
| B. | less |
| C. | same |
| D. | more or less depending on quantum of load |
| Answer» B. less | |
| 984. |
Stress concentration is caused due |
| A. | variation in properties of material from point to point in a member |
| B. | pitting atpoints or areas at which loads on a member are applied |
| C. | abrupt change of section |
| D. | all of the above |
| Answer» E. | |
| 985. |
Brittle coating technique is used for |
| A. | determining brittleness |
| B. | protecting metal against corrosion |
| C. | protecting metal against wear and tear |
| D. | experimental stress analysis |
| Answer» E. | |
| 986. |
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by |
| A. | decreasing the cross-section area of bar |
| B. | increasing the cross-section area of bar |
| C. | remain unaffected with cross-section area |
| D. | would depend upon other factors |
| Answer» B. increasing the cross-section area of bar | |
| 987. |
Resilience of a material is important, when it is subjected to |
| A. | combined loading |
| B. | fatigue |
| C. | thermal stresses |
| D. | shock loading. |
| Answer» E. | |
| 988. |
Rankine's theory of failure is applicable for following type of materials |
| A. | brittle |
| B. | ductile |
| C. | elastic |
| D. | plastic |
| Answer» B. ductile | |
| 989. |
Guest's theory of failure is applicable for following type of materials |
| A. | brittle |
| B. | ductile |
| C. | elastic |
| D. | plastic |
| Answer» C. elastic | |
| 990. |
A hot short metal is |
| A. | brittle when cold |
| B. | brittle when hot |
| C. | brittle under all conditions |
| D. | ductile at high temperature |
| Answer» C. brittle under all conditions | |
| 991. |
The ultimate strength of steel in tension in comparison to shear is in the ratio of |
| A. | 1 : l |
| B. | 2:1 |
| C. | 3 : 2 |
| D. | 2 : 3 |
| Answer» D. 2 : 3 | |