MCQOPTIONS
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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
The major diameter of a screw thread is also known as core or root diameter. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 902. |
The helix angle for single helical gears ranges from |
| A. | 10 to 15 |
| B. | 15 to 20 |
| C. | 20 to 35 |
| D. | 35 to 50 |
| Answer» D. 35 to 50 | |
| 903. |
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called |
| A. | plasticity |
| B. | elasticity |
| C. | ductility |
| D. | malleability |
| Answer» D. malleability | |
| 904. |
In case of pressure vessels having open ends, the fluid pressure induces |
| A. | longitudinal stress |
| B. | circumferential stress |
| C. | shear stress |
| D. | none of these |
| Answer» C. shear stress | |
| 905. |
The set screws are used to prevent relative motion between the two parts. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 906. |
The face angle of a bevel gear is equal to |
| A. | pitch angle - addendum angle |
| B. | pitch angle + addendum angle |
| C. | pitch angle - dedendum angle |
| D. | pitch angle + dedendum angle |
| Answer» C. pitch angle - dedendum angle | |
| 907. |
Two shafts will have equal strength, if |
| A. | diameter of both the shafts is same |
| B. | angle of twist of both the shafts is same |
| C. | material of both the shafts is same |
| D. | twisting moment of both the shafts is same |
| Answer» E. | |
| 908. |
The size of a cam depends upon |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | pitch curve |
| Answer» B. pitch circle | |
| 909. |
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/591-419-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/591-419-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/591-419-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/591-419-4.png"> |
| Answer» E. | |
| 910. |
The static tooth load should be __________ the dynamic load. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 911. |
Power screws are used to convert rotary motion into translatory motion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 912. |
The function of the washer is to |
| A. | fill up the axial gap |
| B. | provide bearing area |
| C. | provide cushioning effect |
| D. | absorb shocks and vibrations |
| Answer» C. provide cushioning effect | |
| 913. |
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| Answer» B. decreases | |
| 914. |
In cylindrical cams, the follower moves |
| A. | in a direction perpendicular to the cam axis |
| B. | in a direction parallel to the cam axis |
| C. | in any direction irrespective of cam axis |
| D. | along the cam axis |
| Answer» C. in any direction irrespective of cam axis | |
| 915. |
The included angle for the acme thread is 29 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 916. |
In a transverse fillet welded joint, the size of weld is __________ the throat of weld. |
| A. | 0.5 times |
| B. | equal to |
| C. | <span class="root">2</span> |
| D. | times |
| E. | double |
| Answer» D. times | |
| 917. |
In the levers of first type, the mechanical advantage is __________ one. |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» D. | |
| 918. |
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that |
| A. | it is subjected to a higher stress than the outer side |
| B. | it is subjected to a higher cyclic loading than the outer side |
| C. | it is more stretched than the outer side during the manufacturing process |
| D. | it has a lower curvature than the outer side |
| Answer» C. it is more stretched than the outer side during the manufacturing process | |
| 919. |
The bearing characteristic number is given by (where p = Bearing pressure on the projected bearing area, Z = Absolute viscosity of the lubricant, and N = Speed of the journal) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/596-474-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/596-474-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/596-474-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/596-474-4.png"> |
| Answer» E. | |
| 920. |
The wire ropes make contact at |
| A. | bottom of groove of the pulley |
| B. | sides of groove of the pulley |
| C. | sides and bottom of groove of the pulley |
| D. | anywhere in the groove of the pulley |
| Answer» B. sides of groove of the pulley | |
| 921. |
Which one of the following is a positive drive? |
| A. | Crossed flat belt drive |
| B. | Rope drive |
| C. | V-belt drive |
| D. | Chain drive |
| Answer» E. | |
| 922. |
Two closely coiled helical springs with stiffnesses k1 and k2 respectively are connected in series. The stiffness of an equivalent spring is given by |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/592-432-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/592-432-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/592-432-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/592-432-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/592-432-2.png"> | |
| 923. |
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called |
| A. | zero film bearing |
| B. | boundary lubricated bearing |
| C. | hydrodynamic lubricated bearing |
| D. | hydrostatic lubricated bearing |
| Answer» E. | |
| 924. |
In case of pressure vessels having closed ends, the fluid pressure induces |
| A. | longitudinal stress |
| B. | circumferential stress |
| C. | shear stress |
| D. | none of these |
| Answer» E. | |
| 925. |
The rivet head used for boiler plate riveting is usually |
| A. | snap head |
| B. | pan head |
| C. | counter sunk head |
| D. | conical head |
| Answer» B. pan head | |
| 926. |
The standard length of the shaft is |
| A. | 5 m |
| B. | 6 m |
| C. | 7 m |
| D. | all of these |
| Answer» E. | |
| 927. |
Euler's formula for a mild steel column is not valid if the slenderness ratio is |
| A. | 60 |
| B. | 90 |
| C. | 100 |
| D. | 120 |
| Answer» B. 90 | |
| 928. |
The module in the reciprocal of diametral pitch. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 929. |
The velocity factor for carefully cut gears operating at velocities upto __________ is equal to 4.5/4.5 + v. |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» C. 15 m/s | |
| 930. |
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as hollow saddle key. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 931. |
In levers, leverage is the ratio of |
| A. | load lifted to the effort applied |
| B. | mechanical advantage to the velocity ratio |
| C. | load arm to the effort arm |
| D. | effort arm to the load arm |
| Answer» E. | |
| 932. |
The diameter of washer is generally taken bigger than the nut size. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 933. |
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value? |
| A. | Maximum principal stress theory |
| B. | Maximum shear stress theory |
| C. | Maximum strain energy theory |
| D. | Maximum distortion energy theory |
| Answer» B. Maximum shear stress theory | |
| 934. |
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the |
| A. | initial tension |
| B. | external load applied |
| C. | sum of the initial tension and external load applied |
| D. | initial tension or external load, whichever is greater |
| Answer» D. initial tension or external load, whichever is greater | |
| 935. |
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as |
| A. | M6 |
| B. | M8 |
| C. | M6 - 8d |
| D. | M8 - 6d |
| Answer» D. M8 - 6d | |
| 936. |
According to maximum normal stress theory, the maximum normal stress in the shaft is |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/machine-design/579-267-4.png"> | |
| 937. |
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/562-74-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/562-74-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/562-74-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/562-74-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/machine-design/562-74-3.png"> | |
| 938. |
In designing a connecting rod, it is considered like __________ for buckling about Y-axis. |
| A. | both ends hinged |
| B. | both ends fixed |
| C. | one end fixed and the other end hinged |
| D. | one end fixed and the other end free |
| Answer» C. one end fixed and the other end hinged | |
| 939. |
A steel containing __________ 0.8% carbon is known as hypo-eutectoid steel. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 940. |
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» E. | |
| 941. |
A connecting rod should be |
| A. | strong in buckling about X-axis |
| B. | strong in buckling about Y-axis |
| C. | equally strong in buckling about X-axis and Y-axis |
| D. | any one of the above |
| Answer» D. any one of the above | |
| 942. |
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a |
| A. | short bearing |
| B. | long bearing |
| C. | medium bearing |
| D. | square bearing |
| Answer» E. | |
| 943. |
When two non-parallel or intersecting but coplaner shafts are connected by gears, the arrangement is known as bevel gearing. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 944. |
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is |
| A. | equal to 1/10 |
| B. | less than 1/10 |
| C. | greater than 1/10 |
| D. | none of these |
| Answer» D. none of these | |
| 945. |
The radial stress across the thickness of a thick cylinder is maximum at the inner surface and zero at the outer surface. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 946. |
The resilience of a bolt may be increased by |
| A. | increasing its shank diameter |
| B. | increasing its length |
| C. | decreasing its shank diameter |
| D. | decreasing its length |
| Answer» C. decreasing its shank diameter | |
| 947. |
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» D. | |
| 948. |
Which one of the following loading is considered for the design of axles? |
| A. | Bending moment only |
| B. | Twisting moment only |
| C. | Combined bending moment and twisting moments |
| D. | Combined action of bending moment, twisting moment and axial thrust |
| Answer» B. Twisting moment only | |
| 949. |
The shear stress in a beam varies from zero at the outer fibres to a maximum at the neutral surface. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 950. |
In worm, gears, pitch lead angle is |
| A. | half the angle between two inclined faces in axial plane |
| B. | the angle between the tangent to the pitch helix and the plane of rotation |
| C. | the angle between the tangent to the pitch helix and an element of the cylinder |
| D. | none of the above |
| Answer» C. the angle between the tangent to the pitch helix and an element of the cylinder | |