MCQOPTIONS
Saved Bookmarks
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.
| 801. |
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)? |
| A. | 2μ sinθ/(θ + sinθ) |
| B. | μ sinθ/(2θ + sin 2θ) |
| C. | 4μ sinθ/(θ + sinθ) |
| D. | 4μ sinθ/(2θ + sin 2θ) |
| Answer» E. | |
| 802. |
According to Indian standard specifications, 100 H6/g5 means that? |
| A. | Tolerance grade for the hole is 6 and for the shaft is 5 |
| B. | Tolerance grade for the shaft is 6 and for the hole is 5 |
| C. | Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7 |
| D. | Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7 |
| Answer» B. Tolerance grade for the shaft is 6 and for the hole is 5 | |
| 803. |
Wahl's stress factor __________ very rapidly as the spring index decreases.? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Decreases | |
| 804. |
A double strap butt joint (with equal straps) is? |
| A. | Always in single shear |
| B. | Always in double shear |
| C. | Either in single shear or double shear |
| D. | Any one of these |
| Answer» C. Either in single shear or double shear | |
| 805. |
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be? |
| A. | Knuckle threads |
| B. | Square threads |
| C. | Acme threads |
| D. | Buttress threads |
| Answer» E. | |
| 806. |
If T‚ÇÅ and T‚ÇÇ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to? |
| A. | T‚ÇÅ - T‚ÇÇ + Tc |
| B. | T‚ÇÅ + T‚ÇÇ + Tc |
| C. | (T‚ÇÅ - T‚ÇÇ + Tc)/2 |
| D. | (T‚ÇÅ + T‚ÇÇ + Tc)/2 |
| Answer» E. | |
| 807. |
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 | |
| 808. |
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.? |
| A. | Thick film |
| B. | Thin film |
| C. | Either A or B |
| D. | None of these |
| Answer» C. Either A or B | |
| 809. |
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.? |
| A. | 10 times |
| B. | 5 times |
| C. | 15 times |
| D. | 20 times |
| Answer» D. 20 times | |
| 810. |
Antifriction bearings are? |
| A. | Sleeve bearings |
| B. | Hydrodynamic bearings |
| C. | Thin lubricated bearings |
| D. | None of the above |
| Answer» E. | |
| 811. |
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be? |
| A. | 4F/ πd² |
| B. | 6F/ πd² |
| C. | 8F/ πd² |
| D. | 16F/ 3πd² |
| Answer» E. | |
| 812. |
The rated life of a bearing varies? |
| A. | Directly as load |
| B. | Inversely as square of load |
| C. | Inversely as cube of load |
| D. | Inversely as fourth power of load |
| Answer» D. Inversely as fourth power of load | |
| 813. |
Resistance to fatigue of a material is measured by? |
| A. | Young's modulus |
| B. | Coefficient of elasticity |
| C. | Elastic limit |
| D. | Endurance limit |
| Answer» E. | |
| 814. |
In oilness 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. | Do not require external supply of lubricant |
| D. | Grease required to be applied after some intervals |
| Answer» D. Grease required to be applied after some intervals | |
| 815. |
The strap end of a connecting rod of steam engine is joined by? |
| A. | Gib of cotter joint |
| B. | Sleeve and cotter joint |
| C. | Spigot socket cotter joint |
| D. | Knuckle joint |
| Answer» B. Sleeve and cotter joint | |
| 816. |
In case of V belt drive? |
| A. | The belt should touch the bottom of groove in the pulley |
| B. | The belt should not touch the bottom of groove in the pulley |
| C. | The belt should not touch the sides of groove in the pulley |
| D. | None of the above |
| Answer» C. The belt should not touch the sides of groove in the pulley | |
| 817. |
The pitch of threads on a Jock nut in comparison to pitch of nut is? |
| A. | Same |
| B. | Coarser |
| C. | Finer |
| D. | Very fine |
| Answer» B. Coarser | |
| 818. |
The strength of a riveted joint is equal to? |
| A. | Tearing strength of plate (Pt) |
| B. | Shearing strength of rivet (Ps) |
| C. | Crushing strength of rivet (Pc) |
| D. | Least value of Pt Ps and Pc |
| Answer» E. | |
| 819. |
In order to withstand resistance to wear, the best profile of gear is? |
| A. | 14½° full depth involute tooth |
| B. | 20° full depth involute tooth |
| C. | 20° involute stub tooth |
| D. | 14½° stub tooth |
| Answer» B. 20¬¨‚àû full depth involute tooth | |
| 820. |
The power transmitted by belt drive depends upon? |
| A. | Belt velocity |
| B. | Initial belt tension |
| C. | Arc of contact |
| D. | All of the above |
| Answer» E. | |
| 821. |
When compared to the rod of the same diameter and material, a wire rope? |
| A. | Is less flexible |
| B. | Has a much smaller load carrying capacity |
| C. | Does not provide much warning before failure |
| D. | Provides much greater time for remedial action before failure |
| Answer» C. Does not provide much warning before failure | |
| 822. |
The lower deviation is the algebraic difference between the? |
| A. | Actual size and the corresponding basic size |
| B. | Maximum limit and the basic size |
| C. | Minimum limit and the basic size |
| D. | None of the above |
| Answer» D. None of the above | |
| 823. |
Which of the following pipe joints would be suitable for pipes carrying steam?? |
| A. | Flanged |
| B. | Threaded |
| C. | Bell and spigot |
| D. | Expansion |
| Answer» E. | |
| 824. |
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Decreases | |
| 825. |
According to I.B.R., the thickness of the boiler shell should not be less than? |
| A. | 4 mm |
| B. | 5 mm |
| C. | 6 mm |
| D. | 7 mm |
| Answer» E. | |
| 826. |
A column of length l is fixed at both ends. The equivalent length of the column is? |
| A. | l/2 |
| B. | l/‚à ö2 |
| C. | l |
| D. | 2 l |
| Answer» B. l/‚Äö√ √∂2 | |
| 827. |
A feather key is generally? |
| A. | Loose in shaft and tight in hub |
| B. | Tight in shaft and loose in hub |
| C. | Tight in both shaft and hub |
| D. | Loose in both shaft and hub |
| Answer» C. Tight in both shaft and hub | |
| 828. |
A connecting rod is designed as a? |
| A. | Long column |
| B. | Short column |
| C. | Strut |
| D. | All of these |
| Answer» D. All of these | |
| 829. |
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be? |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 10 |
| Answer» B. 6 | |
| 830. |
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to? |
| A. | 0.2 |
| B. | 0.25 |
| C. | 0.50 |
| D. | 0.6 |
| Answer» C. 0.50 | |
| 831. |
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 | |
| 832. |
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 | |
| 833. |
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.? |
| A. | Same |
| B. | Less |
| C. | More |
| D. | None of these |
| Answer» D. None of these | |
| 834. |
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of? |
| A. | 0.45 |
| B. | 0.55 |
| C. | 0.65 |
| D. | 0.75 |
| Answer» E. | |
| 835. |
For same pulley diameters, center distance, belt speed and belt and pulley materials,? |
| A. | Open belt drive transmits more power than crossed belt drive |
| B. | Crossed belt drive transmits more power than open belt drive |
| C. | Open and crossed belt drives transmit same power |
| D. | Power transmission does not depend upon open and crossed types of constructions |
| Answer» C. Open and crossed belt drives transmit same power | |
| 836. |
Form coefficient of spring is? |
| A. | Ratio of coil diameter to wire diameter |
| B. | Load required to produce unit deflection |
| C. | Its capability of storing energy |
| D. | Concerned with strength of wire of spring |
| Answer» D. Concerned with strength of wire of spring | |
| 837. |
The rolling contact bearings are known as? |
| A. | Thick lubricated bearings |
| B. | Plastic bearings |
| C. | Antifriction bearings |
| D. | Thin lubricated bearings |
| Answer» D. Thin lubricated bearings | |
| 838. |
Shear stress theory is applicable for? |
| A. | Ductile materials |
| B. | Brittle materials |
| C. | Elastic materials |
| D. | All of the above |
| Answer» B. Brittle materials | |
| 839. |
The spring mostly used in gramophones is? |
| A. | Helical spring |
| B. | Conical spring |
| C. | Flat spiral spring |
| D. | Volute spring |
| Answer» D. Volute spring | |
| 840. |
A locking device extensively used in marine type connecting rod ends is a? |
| A. | Jam nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Ring nut |
| Answer» E. | |
| 841. |
A screw is said to be over hauling screw, if its efficiency is? |
| A. | More than 50% |
| B. | Less than 50% |
| C. | Equal to 50% |
| D. | None of these |
| Answer» B. Less than 50% | |
| 842. |
The taper on a rectangular sunk key is? |
| A. | 1 in 16 |
| B. | 1 in 32 |
| C. | 1 in 48 |
| D. | 1 in 100 |
| Answer» E. | |
| 843. |
The maximum normal stress theory is used for? |
| A. | Plastic materials |
| B. | Brittle materials |
| C. | Non-ferrous materials |
| D. | Ductile materials |
| Answer» C. Non-ferrous materials | |
| 844. |
For hardening alloy steels and high speed steels, they are heated to? |
| A. | 1100 to 1300°C |
| B. | 1300 to 1500°C |
| C. | 500 to 600°C |
| D. | 700 to 900°C |
| Answer» B. 1300 to 1500¬¨‚àûC | |
| 845. |
The creep in the belt is due to? |
| A. | Effect of temperature on belt |
| B. | Material of belt |
| C. | Unequal extensions in the belt due to tight and slack side tensions |
| D. | Stresses beyond elastic limit of belt material |
| Answer» D. Stresses beyond elastic limit of belt material | |
| 846. |
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» B. Decreases | |
| 847. |
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)? |
| A. | 1420 d |
| B. | 1680 d |
| C. | 2080 d |
| D. | 2840 d |
| Answer» E. | |
| 848. |
The value of Lewis form factor used in design of gears is? |
| A. | Dependent on number of teeth of a gear |
| B. | Dependent on system of teeth |
| C. | Independent of size of teeth |
| D. | All of these |
| Answer» E. | |
| 849. |
In a flange coupling, the flanges are coupled together by means of? |
| A. | Bolts and nuts |
| B. | Studs |
| C. | Headless taper bolts |
| D. | None of these |
| Answer» B. Studs | |
| 850. |
The backlash for spur gears depends upon? |
| A. | Module |
| B. | Tooth profile |
| C. | Both module and pitch line velocity |
| D. | Pitch line velocity |
| Answer» D. Pitch line velocity | |