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.
| 801. |
A shaft is designed on the basis of rigidity and stiffness. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 802. |
Which of the following spring is used in mechanical wrist watch? |
| A. | Helical compression spring |
| B. | Spiral spring |
| C. | Torsion spring |
| D. | Bellevile spring |
| Answer» D. Bellevile spring | |
| 803. |
In worm gears, the pressure angle is half the angle between two inclined faces in axial plane. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 804. |
For crank shaft bearings, the ratio of the length of the journal to its diameter is less than unity. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 805. |
Lewis equation in gears is used to find the |
| A. | tensile stress in bending |
| B. | shear stress |
| C. | compressive stress in bending |
| D. | fatigue stress |
| Answer» D. fatigue stress | |
| 806. |
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. | |
| 807. |
All stresses produced in a belt are |
| A. | compressive stresses |
| B. | tensile stresses |
| C. | both tensile and compressive stresses |
| D. | shear stresses |
| Answer» C. both tensile and compressive stresses | |
| 808. |
In a bolt, the plane of shear should be across the threaded portion of the shank. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 809. |
When a metal or alloy is cold worked, |
| A. | its hardness and strength increases |
| B. | it is worked below recrystallisation temperature |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 810. |
A leaf spring in automobiles is used |
| A. | to apply forces |
| B. | to measure forces |
| C. | to absorb shocks |
| D. | to store strain energy |
| Answer» D. to store strain energy | |
| 811. |
According to I.B.R., the factor of safety of riveted joint should not be less than |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 812. |
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 813. |
Wahl's stress factor __________ very rapidly as the spring index decreases. |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 814. |
For circumferential joint in boilers, the type of joint used is |
| A. | butt joint with single cover plate |
| B. | butt joint with double cover plate |
| C. | lap joint with one ring overlapping the other |
| D. | any one of the above |
| Answer» D. any one of the above | |
| 815. |
In cyclic loading, stress concentration is more serious in |
| A. | brittle materials |
| B. | ductile materials |
| C. | brittle as well as ductile materials |
| D. | elastic materials |
| Answer» C. brittle as well as ductile materials | |
| 816. |
For a square key made of mild steel, the shear and crushing strength are related as |
| A. | shear strength is equal to crushing strength |
| B. | shear strength is greater than crushing strength |
| C. | shear strength is less than crushing strength |
| D. | none of the above |
| Answer» B. shear strength is greater than crushing strength | |
| 817. |
Which of the following welded joint is designed for shear strength ? |
| A. | Transverse fillet welded joint |
| B. | Parallel fillet welded joint |
| C. | Butt welded joint |
| D. | all of these |
| Answer» C. Butt welded joint | |
| 818. |
In designing a connecting rod, it is considered like __________ for buckling about X-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» B. both ends fixed | |
| 819. |
The material commonly used for crane hooks is |
| A. | cast iron |
| B. | wrought iron |
| C. | mild steel |
| D. | aluminium |
| Answer» C. mild steel | |
| 820. |
The eye bolts are used for |
| A. | transmission of power |
| B. | locking devices |
| C. | lifting and transporting heavy machines |
| D. | absorbing shocks and vibrations |
| Answer» D. absorbing shocks and vibrations | |
| 821. |
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to |
| A. | static load |
| B. | dynamic load |
| C. | static as well as dynamic load |
| D. | completely reversed load |
| Answer» E. | |
| 822. |
The Wahl's stress factor (K) for springs is given by (where ) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/592-424-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/592-424-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/592-424-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/592-424-4.png"> |
| Answer» E. | |
| 823. |
According to Rankine's theory, the failure occurs at a point in a member |
| A. | when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in a simple tension test |
| B. | when the maximum principal stress in a bi-axial stress system reaches the elastic limit of the material in a simple tension test |
| C. | when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test |
| D. | when the maximum principal strain in a bi-axial stress system reaches the strain at the elastic limit as determined from a simple tension test |
| Answer» C. when the strain energy per unit volume in a bi-axial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test | |
| 824. |
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called |
| A. | plasticity |
| B. | elasticity |
| C. | ductility |
| D. | malleability |
| Answer» E. | |
| 825. |
In a steam engine, the valve rod is connected to an eccentric rod by means of |
| A. | cotter joint |
| B. | knuckle joint |
| C. | universal joint |
| D. | flange coupling |
| Answer» C. universal joint | |
| 826. |
The dedendum is the radial distance from the |
| A. | pitch circle to the top of a tooth |
| B. | pitch circle to the bottom of a tooth |
| C. | top of a tooth to the bottom of a tooth |
| D. | addendum circle to the clearance circle |
| Answer» C. top of a tooth to the bottom of a tooth | |
| 827. |
Crowning on pulley helps |
| A. | in decreasing the slip of the belt |
| B. | in increasing the slip of the belt |
| C. | to keep the belt in centre on a pulley while it is in motion |
| D. | to increase pulley life |
| Answer» D. to increase pulley life | |
| 828. |
The effect of key ways on a shaft is to reduce its load carrying capacity and to increase its torsional rigidity. |
| A. | True |
| B. | False |
| Answer» C. | |
| 829. |
Antifriction bearings are |
| A. | thick lubricated bearings |
| B. | plastic bearings |
| C. | thin lubricated bearings |
| D. | ball and roller bearings |
| Answer» E. | |
| 830. |
In the levers of __________ type, the mechanical advantage is less than one. |
| A. | first |
| B. | second |
| C. | third |
| Answer» D. | |
| 831. |
The property of a bearing material which has the ability to accomodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as |
| A. | bondability |
| B. | embeddability |
| C. | comformability |
| D. | fatigue strength |
| Answer» D. fatigue strength | |
| 832. |
Stress concentration factor is defined as the ratio of |
| A. | maximum stress to the endurance limit |
| B. | nominal stress to the enurance limit |
| C. | maximum stress to the nominal stress |
| D. | nominal stress to the maximum stress |
| Answer» D. nominal stress to the maximum stress | |
| 833. |
A hollow saddle key is |
| A. | a taper key which fits half in the key way of hub and half in the key way of shaft |
| B. | a taper key which fits in a key way of the hub and is flat on the shaft |
| C. | a taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft |
| D. | provided in pairs at right angles and each key is to withstand torsion in one direction only |
| Answer» D. provided in pairs at right angles and each key is to withstand torsion in one direction only | |
| 834. |
In a crossed belt drive, the shafts are arranged parallel and rotate in the same directions. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 835. |
A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be |
| A. | 2.5 |
| B. | 2.8 |
| C. | 3.0 |
| D. | 3.5 |
| Answer» C. 3.0 | |
| 836. |
The expression 0.175 - 0.841/T is the Lewis form factor for |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/602-540-1.png"> |
| B. | composite and full depth involute system |
| C. | 20 full depth involute system |
| D. | 20 stub system |
| E. | none of the above |
| Answer» D. 20 stub system | |
| 837. |
The longitudinal stress is __________ of the circumferential stress. |
| A. | one-half |
| B. | two-third |
| C. | three-fourth |
| D. | double |
| Answer» B. two-third | |
| 838. |
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/578-262-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/578-262-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/578-262-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/578-262-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/machine-design/578-262-3.png"> | |
| 839. |
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as |
| A. | helix angle |
| B. | pressure angle |
| C. | pitch lead angle |
| D. | none of these |
| Answer» B. pressure angle | |
| 840. |
Idler pulley is used for |
| A. | increasing velocity ratio |
| B. | for applying tension |
| C. | changing the direction of motion of belt |
| D. | all of these |
| Answer» C. changing the direction of motion of belt | |
| 841. |
The bell crank levers used in railway signalling arrangement are of third type levers. |
| A. | True |
| B. | False |
| Answer» C. | |
| 842. |
When spring index increases, the value of Wahl's stress factor |
| A. | increases linearly |
| B. | decreases linearly |
| C. | remains same |
| D. | increases exponentially |
| Answer» E. | |
| 843. |
A screw will be self locking, if |
| 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» C. friction angle is equal to helix angle | |
| 844. |
The maximum shear stress theory is used for |
| A. | brittle materials |
| B. | ductile materials |
| C. | plastic materials |
| D. | non-ferrous materials |
| Answer» C. plastic materials | |
| 845. |
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear. |
| A. | right hand |
| B. | left hand |
| Answer» C. | |
| 846. |
The rocker arms in internal combustion engines are of first type levers. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 847. |
The cross-section of the arm of a bell crank lever is |
| A. | rectangular |
| B. | elliptical |
| C. | I-section |
| D. | any one of these |
| Answer» E. | |
| 848. |
A connecting rod is designed as a |
| A. | long column |
| B. | short column |
| C. | strut |
| D. | all of these |
| Answer» D. all of these | |
| 849. |
The metal suitable for bearings subjected to light loads is |
| A. | silicon bronze |
| B. | white metal |
| C. | monel metal |
| D. | phosphor bronze |
| Answer» E. | |
| 850. |
A connecting rod subjected to an axial load may buckle in the plane perpendicular to the plane of motion of the connecting rod. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |