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MCQOPTIONS
This section includes 1003 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 951. |
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to |
| A. | Obtain variable moment of inertia (I) in each leaf |
| B. | Permit each leaf to act as an overhanging beam |
| C. | Have variable bending moment (M) in each leaf |
| D. | Make M/I constant throughout the length of the leaf |
| Answer» E. | |
| 952. |
The maximum shear stress theory is used for |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Plastic materials |
| D. | Nonferrous materials |
| Answer» C. Plastic materials | |
| 953. |
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. | Angular bevel gears |
| B. | Mitre gears |
| C. | Crown Bevel gears |
| D. | Internal bevel gears |
| Answer» C. Crown Bevel gears | |
| 954. |
The bearings of heavy series have capacity __________ over the medium series. |
| A. | 20 to 30% |
| B. | 10 to 20% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» B. 10 to 20% | |
| 955. |
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be |
| A. | 2/8 |
| B. | 8/2 |
| C. | 4/8 |
| D. | 8/4 |
| Answer» D. 8/4 | |
| 956. |
The most important dimension in the design of a nut is |
| A. | Pitch diameter |
| B. | Inside diameter |
| C. | Outside diameter |
| D. | Height |
| Answer» E. | |
| 957. |
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as# |
| A. | T sec³φ |
| B. | T sec²φ |
| C. | T/sec³φ |
| D. | T cosecφ |
| Answer» B. T sec¬¨‚â§≈ì√ú | |
| 958. |
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called |
| A. | Hydrostatic lubricated bearing |
| B. | Hydrodynamic lubricated bearing |
| C. | Boundary lubricated bearing |
| D. | Zero film bearing |
| Answer» B. Hydrodynamic lubricated bearing | |
| 959. |
A chain drive transmits __________ power as compared to belt drive. |
| A. | More |
| B. | Less |
| C. | Same |
| D. | None of these |
| Answer» B. Less | |
| 960. |
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct? |
| A. | There are four rivets per pitch length, all in double shear |
| B. | There are four rivets per pitch length, out of which two are in single shear and two are in double shear |
| C. | There are five rivets per pitch length, all in double shear |
| D. | There are five rivets per pitch length, out of which four are in double shear and one is in single shear |
| Answer» E. | |
| 961. |
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as |
| A. | Spur gearing |
| B. | Helical gearing |
| C. | Bevel gearing |
| D. | Spiral gearing |
| Answer» E. | |
| 962. |
A bolt is designed on the basis of __________ with a large factor of safety. |
| A. | Direct tensile stress |
| B. | Direct compressive stress |
| C. | Direct bending stress |
| D. | Direct shear stress |
| Answer» B. Direct compressive stress | |
| 963. |
Which of the following is an anti-friction bearing? |
| A. | Journal bearing |
| B. | Pedestal bearing |
| C. | Collar bearing |
| D. | Needle bearing |
| Answer» E. | |
| 964. |
In composite or reverse laid ropes |
| A. | Direction of twist of wires in strands is opposite to the direction of twist of strands |
| B. | Direction of twist of wires and strands are same |
| C. | Wires in two adjacent strands are twisted in opposite direction |
| D. | Wires are not twisted |
| Answer» D. Wires are not twisted | |
| 965. |
In a transverse fillet welded joint, the size of weld is __________ the throat of weld. |
| A. | 0.5 times |
| B. | Equal to |
| C. | 2 times |
| D. | Double |
| Answer» D. Double | |
| 966. |
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 | |
| 967. |
A localized compressive stress at the area of contact between two members is known as |
| A. | Bending stress |
| B. | Shear stress |
| C. | Tensile stress |
| D. | Bearing stress |
| Answer» E. | |
| 968. |
The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads. |
| A. | Same |
| B. | Double |
| C. | Three times |
| D. | Four times |
| Answer» C. Three times | |
| 969. |
A coupling used to connect two perfectly aligned shafts, is |
| A. | Muff coupling |
| B. | Compression coupling |
| C. | Flange coupling |
| D. | All of these |
| Answer» E. | |
| 970. |
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. | |
| 971. |
When the bolt is very yielding as compared to the connected members, 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» E. | |
| 972. |
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension) |
| A. | [(‚à öP1 + ‚à öP2)/2]¬≤ |
| B. | P1 + P2 |
| C. | ⅟₂× (P1 + P2) |
| D. | [‚Öü‚ÇÇ √ó (P1 + P2)] + Pc |
| Answer» B. P1 + P2 | |
| 973. |
What is the answer to this question? |
| A. | 2WD3n/Gd‚Å¥ |
| B. | 4WD3n/Gd‚Å¥ |
| C. | 8WD3n/Gd‚Å¥ |
| D. | 16WD3n/Gd‚Å¥ |
| Answer» D. 16WD3n/Gd‚Äö√Ö¬• | |
| 974. |
The maximum bending stress in a curved beam having symmetrical section always occur at the |
| A. | Centroidal axis |
| B. | Neutral axis |
| C. | Inside fiber |
| D. | Outside fiber |
| Answer» D. Outside fiber | |
| 975. |
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be# |
| A. | 12 |
| B. | 14 |
| C. | 18 |
| D. | 24 |
| Answer» D. 24 | |
| 976. |
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. | p/ZN |
| C. | Z/pN |
| D. | N/Zp |
| Answer» B. p/ZN | |
| 977. |
The modulus of elasticity for mild steel is approximately equal to |
| A. | 80 kN/mm² |
| B. | 100 kN/mm² |
| C. | 110 kN/mm² |
| D. | 210 kN/mm² |
| Answer» E. | |
| 978. |
In most machine members, the damping capacity of the material should be |
| A. | Low |
| B. | Zero |
| C. | High |
| D. | Could be anything |
| Answer» D. Could be anything | |
| 979. |
Basic hole is one |
| A. | Whose upper deviation is zero |
| B. | Whose lower deviation is zero |
| C. | Whose lower as well as upper deviations are zero |
| D. | Does not exist |
| Answer» C. Whose lower as well as upper deviations are zero | |
| 980. |
The process extensively used for making bolts and nuts is |
| A. | Hot piercing |
| B. | Extrusion |
| C. | Cold peening |
| D. | Cold heading |
| Answer» E. | |
| 981. |
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is |
| A. | 5 N-m |
| B. | 7 N-m |
| C. | 10 N-m |
| D. | 15 N-m |
| Answer» E. | |
| 982. |
Basic shaft is one |
| A. | Whose upper deviation is zero |
| B. | Whose lower deviation is zero |
| C. | Whose lower as well as upper deviations are zero |
| D. | Does not exist |
| Answer» B. Whose lower deviation is zero | |
| 983. |
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. | |
| 984. |
Which of the following statement is correct, for two shafts connected in parallel? |
| A. | Torque in each shaft is the same |
| B. | Shear stress in each shaft is the same |
| C. | Angle of twist of each shaft is the same |
| D. | Torsional stiffness of each shaft is the same |
| Answer» D. Torsional stiffness of each shaft is the same | |
| 985. |
If a load W is applied instantaneously on a barÕæ Then the stress induced in bar will# |
| A. | Be independent of ratio of mass of load W to mass of bar (y) |
| B. | Increase with increase in y |
| C. | Decrease with decrease in y |
| D. | Depend on other considerations |
| Answer» B. Increase with increase in y | |
| 986. |
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is |
| A. | 1 kN-m |
| B. | 2 kN-m |
| C. | 3 kN-m |
| D. | 4 kN-m |
| Answer» D. 4 kN-m | |
| 987. |
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)# |
| A. | 90° - φ |
| B. | 45° - φ |
| C. | 45° - φ/2 |
| D. | 45° + φ/2 |
| Answer» D. 45¬¨‚àû + ≈ì√ú/2 | |
| 988. |
The centrifugal tension in the belt |
| A. | Increases the power transmitted |
| B. | Decreases the power transmitted |
| C. | Has no effect on the power transmitted |
| D. | Is equal to maximum tension on the belt |
| Answer» D. Is equal to maximum tension on the belt | |
| 989. |
In unilateral system of tolerance, the tolerance is allowed on |
| A. | Both sides of the actual size |
| B. | One side of the actual size |
| C. | One side of the nominal size |
| D. | Both sides of the nominal size |
| Answer» D. Both sides of the nominal size | |
| 990. |
The material commonly used for machine tool bodies is |
| A. | Mild steel |
| B. | Aluminium |
| C. | Brass |
| D. | Cast iron |
| Answer» E. | |
| 991. |
The taper on key is given on |
| A. | Bottom side only |
| B. | Top side only |
| C. | On both sides |
| D. | Any side |
| Answer» C. On both sides | |
| 992. |
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)# |
| A. | σ [1 + (b/2a)] |
| B. | σ [1 + (2a/b)] |
| C. | σ [1 + (b/3a)] |
| D. | σ [1 + (3a/b)] |
| Answer» C. ≈ì√â [1 + (b/3a)] | |
| 993. |
A riveted joint is a __________ fastening. |
| A. | Permanent |
| B. | Temporary |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Temporary | |
| 994. |
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. | (WD/ πd3) × K |
| B. | (2WD/ πd3) × K |
| C. | (4WD/ πd3) × K |
| D. | (8WD/ πd3) × K |
| Answer» E. | |
| 995. |
Which of the following statement is wrong for a connecting rod? |
| A. | The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy |
| B. | If Ixx > 4 Iyy, the buckling will occur about Y-axis |
| C. | If Ixx < 4 Iyy, the buckling will occur about X-axis |
| D. | The most suitable section for the connecting rod is T-section |
| Answer» E. | |
| 996. |
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to |
| A. | 0.75/(0.75 + ‚à öv) |
| B. | 3/(3 + v) |
| C. | 4.5/(4.5 + v) |
| D. | 6/(6 + v) |
| Answer» C. 4.5/(4.5 + v) | |
| 997. |
The dedendum circle diameter is equal to (where φ = Pressure angle)# |
| A. | Pitch circle diameter × cosφ |
| B. | Addendum circle diameter × cosφ |
| C. | Clearance circle diameter × cosφ |
| D. | Pitch circle diameter × sinφ |
| Answer» B. Addendum circle diameter ‚àö√≥ cos≈ì√ú | |
| 998. |
In case of pressure vessels having closed ends, the fluid pressure induces |
| A. | Longitudinal stress |
| B. | Shear stress |
| C. | Circumferential stress |
| D. | None of these |
| Answer» B. Shear stress | |
| 999. |
For high speed engines, the cam follower should move with |
| A. | Uniform velocity |
| B. | Simple harmonic motion |
| C. | Uniform acceleration and retardation |
| D. | Cycloidal motion |
| Answer» E. | |
| 1000. |
A screw is specified by its |
| A. | Major diameter |
| B. | Minor diameter |
| C. | Pitch diameter |
| D. | Pitch |
| Answer» B. Minor diameter | |