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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.
| 751. |
A feather key is generally$? |
| A. | Loose in shaft and tight in hub |
| B. | Tight in shaft and loose in hub |
| C. | Tight in both shaft and hub |
| D. | Loose in both shaft and hub |
| Answer» C. Tight in both shaft and hub | |
| 752. |
According to I.B.R., the thickness of the boiler shell should not be less than$? |
| A. | 4 mm |
| B. | 5 mm |
| C. | 6 mm |
| D. | 7 mm |
| Answer» E. | |
| 753. |
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Decreases | |
| 754. |
The taper on a rectangular sunk key is$? |
| A. | 1 in 16 |
| B. | 1 in 32 |
| C. | 1 in 48 |
| D. | 1 in 100 |
| Answer» E. | |
| 755. |
The creep in the belt is due to$? |
| A. | Effect of temperature on belt |
| B. | Material of belt |
| C. | Unequal extensions in the belt due to tight and slack side tensions |
| D. | Stresses beyond elastic limit of belt material |
| Answer» D. Stresses beyond elastic limit of belt material | |
| 756. |
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | None of these |
| Answer» B. Decreases | |
| 757. |
The maximum normal stress theory is used for$? |
| A. | Plastic materials |
| B. | Brittle materials |
| C. | Non-ferrous materials |
| D. | Ductile materials |
| Answer» C. Non-ferrous materials | |
| 758. |
For hardening alloy steels and high speed steels, they are heated to$? |
| 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 | |
| 759. |
The smallest diameter of an external or internal screw thread is known as$? |
| A. | Minor diameter |
| B. | Major diameter |
| C. | Pitch diameter |
| D. | None of these |
| Answer» B. Major diameter | |
| 760. |
The plasticity is the property of a material which enables it to$? |
| A. | Regain its original shape after deformation when the external forces are removed |
| B. | Draw into wires by the application of a tensile force |
| C. | Resist fracture due to high impact loads |
| D. | Retain deformation produced under load permanently |
| Answer» E. | |
| 761. |
Form coefficient of spring is$? |
| A. | Ratio of coil diameter to wire diameter |
| B. | Load required to produce unit deflection |
| C. | Its capability of storing energy |
| D. | Concerned with strength of wire of spring |
| Answer» D. Concerned with strength of wire of spring | |
| 762. |
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.$? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 763. |
If a bearing is designated by the number 305, it means that the bearing is of$? |
| A. | Medium series whose bore is 5 mm |
| B. | Medium series whose bore is 25 mm |
| C. | Light series whose bore is 25 mm |
| D. | Light series whose bore is 5 mm |
| Answer» C. Light series whose bore is 25 mm | |
| 764. |
The dynamic tooth load is due to$? |
| A. | Inaccuracies of tooth spacing |
| B. | Irregularities in tooth profiles |
| C. | Deflections of teeth under load |
| D. | All of these |
| Answer» E. | |
| 765. |
The crest diameter of a screw thread is same as$? |
| A. | Major diameter |
| B. | Minor diameter |
| C. | Pitch diameter |
| D. | Core diameter |
| Answer» B. Minor diameter | |
| 766. |
The bearings of medium series have capacity __________ over the light series.$? |
| A. | 10 to 20% |
| B. | 20 to 30% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» D. 40 to 50% | |
| 767. |
The spring mostly used in gramophones is$? |
| A. | Helical spring |
| B. | Conical spring |
| C. | Flat spiral spring |
| D. | Volute spring |
| Answer» D. Volute spring | |
| 768. |
A locking device extensively used in marine type connecting rod ends is a$? |
| A. | Jam nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Ring nut |
| Answer» E. | |
| 769. |
The rolling contact bearings are known as$? |
| A. | Thick lubricated bearings |
| B. | Plastic bearings |
| C. | Antifriction bearings |
| D. | Thin lubricated bearings |
| Answer» D. Thin lubricated bearings | |
| 770. |
Shear stress theory is applicable for$? |
| A. | Ductile materials |
| B. | Brittle materials |
| C. | Elastic materials |
| D. | All of the above |
| Answer» B. Brittle materials | |
| 771. |
A screw is said to be over hauling screw, if its efficiency is$? |
| A. | More than 50% |
| B. | Less than 50% |
| C. | Equal to 50% |
| D. | None of these |
| Answer» B. Less than 50% | |
| 772. |
The rated life of a bearing varies$? |
| 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 | |
| 773. |
A double strap butt joint (with equal straps) is$? |
| A. | Always in single shear |
| B. | Always in double shear |
| C. | Either in single shear or double shear |
| D. | Any one of these |
| Answer» C. Either in single shear or double shear | |
| 774. |
Which one of the following loading is considered for the design of axles?$? |
| 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 | |
| 775. |
According to Indian standard specifications, 100 H6/g5 means that$? |
| A. | Tolerance grade for the hole is 6 and for the shaft is 5 |
| B. | Tolerance grade for the shaft is 6 and for the hole is 5 |
| C. | Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7 |
| D. | Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7 |
| Answer» B. Tolerance grade for the shaft is 6 and for the hole is 5 | |
| 776. |
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be$? |
| A. | Knuckle threads |
| B. | Square threads |
| C. | Acme threads |
| D. | Buttress threads |
| Answer» E. | |
| 777. |
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.$? |
| A. | Thick film |
| B. | Thin film |
| C. | Either A or B |
| D. | None of these |
| Answer» C. Either A or B | |
| 778. |
If T‚ÇÅ and T‚ÇÇ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to$? |
| 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. | |
| 779. |
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.$? |
| A. | 10 times |
| B. | 5 times |
| C. | 15 times |
| D. | 20 times |
| Answer» D. 20 times | |
| 780. |
Wahl's stress factor __________ very rapidly as the spring index decreases.$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Decreases | |
| 781. |
When the belt speed increases$? |
| A. | Power transmitted increases |
| B. | Power transmitted decreases |
| C. | Power transmitted increases to a maximum value and then decreases |
| D. | Power transmitted remains the same |
| Answer» D. Power transmitted remains the same | |
| 782. |
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that$? |
| A. | The effect of curvature of the cylinder wall is neglected |
| B. | The tensile stresses are uniformly distributed over the section of the walls |
| C. | The effect of the restraining action of the heads at the end of the pressure vessel is neglected |
| D. | All of the above |
| Answer» E. | |
| 783. |
Which of the following property is essential for spring materials?$? |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 784. |
The tension on the slack side of the belt is __________ the tension on the tight side of the belt.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 785. |
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.$? |
| A. | Rectangular |
| B. | Square |
| C. | Parallel |
| D. | None of these |
| Answer» D. None of these | |
| 786. |
When two helical springs of equal lengths are arranged to form a cluster spring, then$? |
| A. | Shear stress in each spring will be equal |
| B. | Load taken by each spring will be half the total load |
| C. | Only A is correct |
| D. | Both A and B is correct |
| Answer» E. | |
| 787. |
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)$? |
| A. | 2μ sinθ/(θ + sinθ) |
| B. | μ sinθ/(2θ + sin 2θ) |
| C. | 4μ sinθ/(θ + sinθ) |
| D. | 4μ sinθ/(2θ + sin 2θ) |
| Answer» E. | |
| 788. |
In static loading, stress concentration is more serious in$? |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Brittle as well as ductile materials |
| D. | Elastic materials |
| Answer» B. Ductile materials | |
| 789. |
When the belt speed increases? |
| A. | Power transmitted increases |
| B. | Power transmitted decreases |
| C. | Power transmitted increases to a maximum value and then decreases |
| D. | Power transmitted remains the same |
| Answer» D. Power transmitted remains the same | |
| 790. |
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that? |
| A. | The effect of curvature of the cylinder wall is neglected |
| B. | The tensile stresses are uniformly distributed over the section of the walls |
| C. | The effect of the restraining action of the heads at the end of the pressure vessel is neglected |
| D. | All of the above |
| Answer» E. | |
| 791. |
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.? |
| A. | Rectangular |
| B. | Square |
| C. | Parallel |
| D. | None of these |
| Answer» D. None of these | |
| 792. |
In static loading, stress concentration is more serious in? |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Brittle as well as ductile materials |
| D. | Elastic materials |
| Answer» B. Ductile materials | |
| 793. |
The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.? |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» D. None of these | |
| 794. |
If a bearing is designated by the number 305, it means that the bearing is of? |
| A. | Medium series whose bore is 5 mm |
| B. | Medium series whose bore is 25 mm |
| C. | Light series whose bore is 25 mm |
| D. | Light series whose bore is 5 mm |
| Answer» C. Light series whose bore is 25 mm | |
| 795. |
The dynamic tooth load is due to? |
| A. | Inaccuracies of tooth spacing |
| B. | Irregularities in tooth profiles |
| C. | Deflections of teeth under load |
| D. | All of these |
| Answer» E. | |
| 796. |
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 | |
| 797. |
The bearings of medium series have capacity __________ over the light series.? |
| A. | 10 to 20% |
| B. | 20 to 30% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» D. 40 to 50% | |
| 798. |
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. | Only A is correct |
| D. | Both A and B is correct |
| Answer» E. | |
| 799. |
Which of the following property is essential for spring materials?? |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 800. |
The tension on the slack side of the belt is __________ the tension on the tight side of the belt.? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |