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.
| 951. |
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways. |
| A. | 90 |
| B. | 135 |
| C. | 160 |
| D. | 180 |
| Answer» B. 135 | |
| 952. |
The ratio of endurance limit in shear to the endurance limit in flexure is |
| A. | 0.25 |
| B. | 0.40 |
| C. | 0.55 |
| D. | 0.70 |
| Answer» D. 0.70 | |
| 953. |
When plates are fastened by a rivet, the holes in the plates should be made by punching and reaming. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 954. |
The lower deviation is the algebraic difference between the |
| A. | minimum limit and the basic size |
| B. | maximum limit and the basic size |
| C. | actual size and the corresponding basic size |
| D. | none of the above |
| Answer» B. maximum limit and the basic size | |
| 955. |
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of |
| A. | grey colour |
| B. | white colour |
| C. | yellow colour |
| D. | brown colour |
| Answer» B. white colour | |
| 956. |
For hardening alloy steels and high speed steels, they are heated to |
| A. | 500 to 600 C |
| B. | 700 to 900 C |
| C. | 1100 to 1300 C |
| D. | 1300 to 1500 C |
| Answer» D. 1300 to 1500 C | |
| 957. |
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by |
| A. | equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | equating shearing resistance to the crushing resistance of the rivets |
| D. | none of the above |
| Answer» E. | |
| 958. |
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will |
| A. | have contact at the bottom most of the bearing |
| B. | move towards right of the bearing making the metal to metal contact |
| C. | move towards right of the bearing making no metal to metal contact |
| D. | move towards left of the bearing making metal to metal contact |
| Answer» E. | |
| 959. |
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as |
| A. | sunk key |
| B. | flat saddle key |
| C. | hollow saddle key |
| D. | tangent key |
| Answer» B. flat saddle key | |
| 960. |
The metal suitable for bearings subjected to heavy loads is |
| A. | silicon bronze |
| B. | white metal |
| C. | monel metal |
| D. | phosphor bronze |
| Answer» C. monel metal | |
| 961. |
An universal coupling is used to connect two shafts |
| A. | which are perfectly aligned |
| B. | which are not in exact alignment |
| C. | have lateral misalignment |
| D. | whose axes intersect at a small angle |
| Answer» E. | |
| 962. |
The period during which the cam follower remains at rest, when cam moves, is known as |
| A. | constant period |
| B. | fixed period |
| C. | dwell period |
| D. | idle period |
| Answer» D. idle period | |
| 963. |
The included angle for the British Association thread is |
| A. | 29 |
| B. | 47.3 |
| C. | 55 |
| D. | 60 |
| Answer» C. 55 | |
| 964. |
When two helical springs of equal lengths are arranged to form a cluster spring, then |
| A. | shear stress in each spring will be equal |
| B. | load taken by each spring will be half the total load |
| C. | all of the above |
| D. | none of these |
| Answer» D. none of these | |
| 965. |
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 10 |
| Answer» D. 10 | |
| 966. |
The stress in the threaded part of the bolt will be __________ as compared to the shank. |
| A. | same |
| B. | higher |
| C. | lower |
| Answer» C. lower | |
| 967. |
A shaft is a rotating machine element. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 968. |
The flank of the tooth is the |
| A. | surface of the top of the tooth |
| B. | surface of the tooth above the pitch surface |
| C. | surface of the tooth below the pitch surface |
| D. | width of the tooth measured along the pitch circle |
| Answer» D. width of the tooth measured along the pitch circle | |
| 969. |
When the speed of belt increases, |
| A. | the coefficient of friction between the belt and pulley increases |
| B. | the coefficient of friction between the belt and pulley decreases |
| C. | the power transmitted will decrease |
| D. | the power transmitted will increase |
| Answer» D. the power transmitted will increase | |
| 970. |
The load placed at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swivelling mechanism. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 971. |
Two concentric helical springs used to provide greater spring force are wound is opposite direction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 972. |
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm2. If the permissible tensile stress in the metal is 20 N/mm2, then the thickness of the metal required for making the pipe will be |
| A. | 5 mm |
| B. | 10 mm |
| C. | 15 mm |
| D. | 25 mm |
| Answer» E. | |
| 973. |
A tangent key is provided in pairs at right angles and each key is to withstand torsion in one direction only. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 974. |
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the |
| A. | tip of the gear and flank of pinion |
| B. | tip of the pinion and flank of gear |
| C. | flanks of both gear and pinion |
| D. | tip of both gear and pinion |
| Answer» B. tip of the pinion and flank of gear | |
| 975. |
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ is equal to 6/6 + v. |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» E. | |
| 976. |
The power transmitted by means of a belt depends upon |
| A. | velocity of the belt |
| B. | tension under which the belt is placed on the pulleys |
| C. | arc of contact between the belt and the smaller pulley |
| D. | all of the above |
| Answer» E. | |
| 977. |
Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment ? |
| A. | Bushed pin type coupling |
| B. | Universal coupling |
| C. | Oldham coupling |
| D. | all of these |
| Answer» E. | |
| 978. |
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to |
| A. | reduce vibration |
| B. | reduce slip |
| C. | ensure uniform loading |
| D. | ensure proper alignment |
| Answer» D. ensure proper alignment | |
| 979. |
A steel containing 0.8% carbon is known as |
| A. | eutectoid steel |
| B. | hyper-eutectoid steel |
| C. | hypo-eutectqid steel |
| D. | none of these |
| Answer» B. hyper-eutectoid steel | |
| 980. |
Tapered roller bearings can take |
| A. | radial load only |
| B. | axial load only |
| C. | both radial and axial loads and the ratio of these being less than unity |
| D. | both radial and axial loads and the ratio of these being greater than unity |
| Answer» E. | |
| 981. |
In order to remove internal stresses produced by hardening the steel, the process usually adopted is |
| A. | tempering |
| B. | annealing |
| C. | normalising |
| D. | spheroidising |
| Answer» B. annealing | |
| 982. |
A pressure vessel is said to be a thin shell, if the ratio of wall thickness to its diameter is equal to 1/10. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 983. |
A bolt of uniform strength can be developed by |
| A. | keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt |
| B. | keeping the core diameter smaller than the diameter of the unthreaded portion |
| C. | keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt |
| D. | none of the above |
| Answer» B. keeping the core diameter smaller than the diameter of the unthreaded portion | |
| 984. |
The spring mostly used in gramophones is |
| A. | helical spring |
| B. | conical spring |
| C. | flat spiral spring |
| D. | volute spring |
| Answer» D. volute spring | |
| 985. |
For general industrial machinery, the ratio of the length of journal to its diameter is taken as |
| A. | 0.5 to 1 |
| B. | 1 to2 |
| C. | 3 to 5 |
| D. | 5 to 10 |
| Answer» C. 3 to 5 | |
| 986. |
The square threads are usually found on |
| A. | spindles of bench vices |
| B. | railway carriage couplings |
| C. | feed mechanism of machine tools |
| D. | screw cutting lathes |
| Answer» D. screw cutting lathes | |
| 987. |
According to Clavarino's equation, the thickness of a cylinder is equal to (where d = Inner diameter of cylinder, p = Internal pressure, and = Poisson's ratio. ) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/566-120-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/566-120-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/566-120-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/566-120-2.png"> | |
| 988. |
Guest's theory is used for |
| A. | brittle materials |
| B. | ductile materials |
| C. | elastic materials |
| D. | plastic materials |
| Answer» C. elastic materials | |
| 989. |
A screw is said to be over hauling screw, if the |
| A. | friction angle is less than helix angle |
| B. | friction angle is more than helix angle |
| C. | friction angle is equal to helix angle |
| D. | efficiency of screw is 100% |
| Answer» B. friction angle is more than helix angle | |
| 990. |
Shaft coupling is used in machinery to |
| A. | introduce mechanical flexibility |
| B. | introduce protection against over loads |
| C. | reduce the transmission of shock loads |
| D. | all of these |
| Answer» E. | |
| 991. |
Oldham coupling is used to connect two shafts |
| A. | which are perfectly aligned |
| B. | which are not in exact alignment |
| C. | which have lateral misalignment |
| D. | whose axes intersect at a small angle |
| Answer» D. whose axes intersect at a small angle | |
| 992. |
The antifriction bearings |
| A. | have low starting and low running friction at moderate speeds |
| B. | have high initial cost |
| C. | can carry both radial and thrust loads |
| D. | all of these |
| Answer» E. | |
| 993. |
In a partial journal bearing, the angle of contact of the bearing with the journal is |
| A. | 120 |
| B. | 180 |
| C. | 270 |
| D. | 360 |
| Answer» B. 180 | |
| 994. |
A shaft coupling should |
| A. | be easy to connect or disconnect |
| B. | transmit full power of the shaft |
| C. | hold the shafts in perfect alignment |
| D. | all of these |
| Answer» E. | |
| 995. |
A saddle key __________ power through frictional resistance only. |
| A. | transmits |
| B. | does not transmit |
| Answer» B. does not transmit | |
| 996. |
A rivet is specified by |
| A. | shank diameter |
| B. | length of rivet |
| C. | type of head |
| D. | length of tail |
| Answer» B. length of rivet | |
| 997. |
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If t, is the tensile stress for the shell material, then thickness of shell is equal to |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/565-114-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/565-114-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/565-114-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/565-114-4.png"> |
| Answer» E. | |
| 998. |
According to Indian standard specifications, a plain carbon steel designated by 40C8 contains carbon |
| A. | 0.20 to 0.40% |
| B. | 0.35 to 0.45% |
| C. | 0.40 to 0.60% |
| D. | none of these |
| Answer» C. 0.40 to 0.60% | |
| 999. |
The machine screws are |
| A. | slotted for a screw driver and are generally used with a nut |
| B. | similar to tap bolts except that they are of small size and a variety of shapes of heads are available |
| C. | used to prevent relative motion between the two parts |
| D. | none of the above |
| Answer» B. similar to tap bolts except that they are of small size and a variety of shapes of heads are available | |
| 1000. |
In thrust bearings, the load acts |
| A. | along the axis of rotation |
| B. | parallel to the axis of rotation |
| C. | perpendicular to the axis of rotation |
| D. | in any direction |
| Answer» B. parallel to the axis of rotation | |