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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.
| 751. |
When the top of a tooth undercuts the root on the mating gear, it is known as interference. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 752. |
The piston pin bearings in heavy duty diesel engines are |
| A. | needle roller bearings |
| B. | tapered rolierbearings |
| C. | spherical roller bearings |
| D. | cylindrical roller bearings |
| Answer» B. tapered rolierbearings | |
| 753. |
The bending stress in a curved beam is |
| A. | zero at the centroidal axis |
| B. | zero at the point other than centroidal axis |
| C. | maximum at the neutral axis |
| D. | none of these |
| Answer» C. maximum at the neutral axis | |
| 754. |
If the helix angle of a helical gear is increased, the load carrying capacity of the tooth increases. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 755. |
The expansion joint is mostly used for pipes which carry steam at __________ pressures. |
| A. | low |
| B. | high |
| Answer» C. | |
| 756. |
A compound belt drive is used when |
| A. | shafts are arranged parallel and rotate in the opposite directions |
| B. | shafts are arranged parallel and rotate in the same directions |
| C. | shafts are arranged at right angles and rotate in one definite direction |
| D. | none of the above |
| Answer» E. | |
| 757. |
A parallel sunk key, made of steel, is equally strong in shearing and crushing. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 758. |
In designing a key, it is assumed that the distribution of forces along the length of key |
| A. | varies linearly |
| B. | is uniform throughout |
| C. | varies exponentially, being more at the torque-input end |
| D. | varies exponentially, being less at the torque-input end |
| Answer» C. varies exponentially, being more at the torque-input end | |
| 759. |
In a belt drive, the velocity ratio is the inverse ratio of the diameters of driving and driven pulleys. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 760. |
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis. |
| A. | equal to |
| B. | twice |
| C. | three times |
| D. | four times |
| Answer» E. | |
| 761. |
The bearing characteristic number in a hydrodynamic bearing depends upon |
| A. | length, width and load |
| B. | length, width and speed |
| C. | viscosity, speed and load |
| D. | viscosity, speed and bearing pressure |
| Answer» E. | |
| 762. |
Rankine's theory is used for |
| A. | brittle materials |
| B. | ductile materials |
| C. | elastic materials |
| D. | plastic materials |
| Answer» B. ductile materials | |
| 763. |
The objective of caulking in a riveted joint is to make the joint |
| A. | free from corrosion |
| B. | stronger in tension |
| C. | free from stress |
| D. | leak-proof |
| Answer» E. | |
| 764. |
A material is stressed within elastic limit and its linear strain is double as compared to lateral strain. The ratio of its Bulk modulus to Young's modulus will be equal to one. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 765. |
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as |
| A. | feather key |
| B. | gib-head key |
| C. | wood ruff key |
| D. | flat saddle key |
| Answer» E. | |
| 766. |
A spring is used to |
| A. | measure forces |
| B. | apply forces |
| C. | store energy |
| D. | all of these |
| Answer» E. | |
| 767. |
The algebraic difference between the actual size and the corresponding basic size is called actual deviation. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 768. |
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/591-420-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/591-420-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/591-420-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/591-420-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/591-420-2.png"> | |
| 769. |
The average shear stress in the hollow shaft is smaller than the average shear stress in the solid shaft. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 770. |
The distribution of the forces along the length of key fitted in a shaft |
| A. | varies linearly |
| B. | is uniform throughout |
| C. | varies exponentially, being more near the torque-input end |
| D. | varies exponentially, being less near the torque-input end |
| Answer» D. varies exponentially, being less near the torque-input end | |
| 771. |
When a belt drive is transmitting maximum power, |
| A. | effective tension is equal to centrifugal tension |
| B. | effective tension is half of centrifugal tension |
| C. | driving tension on slack side is equal to centrifugal tension |
| D. | driving tension on tight side is twice the centrifugal tension |
| Answer» E. | |
| 772. |
Gears are casted by |
| A. | sand mould casting |
| B. | slush casting |
| C. | permanent mould casting |
| D. | centrifugal casting |
| Answer» D. centrifugal casting | |
| 773. |
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be |
| A. | 0.96 |
| B. | 0.97 |
| C. | 0.98 |
| D. | 0.99 |
| Answer» B. 0.97 | |
| 774. |
In a full journal bearing, the angle of contact of the bearing with the journal is |
| A. | 120 |
| B. | 180 |
| C. | 270 |
| D. | 360 |
| Answer» E. | |
| 775. |
The gears are termed as medium velocity gears, if their peripheral velocity is |
| A. | 1-3 m/s |
| B. | 3-15 m/s |
| C. | 15-30 m/s |
| D. | 30-50 m/s |
| Answer» C. 15-30 m/s | |
| 776. |
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using |
| A. | Gerber relation |
| B. | Soderberg relation |
| C. | Good man relation |
| D. | none of these |
| Answer» D. none of these | |
| 777. |
The coefficient of friction between the belt and pulley depends upon the |
| A. | material of belt and pulley |
| B. | slip of belt |
| C. | speed of belt |
| D. | all of these |
| Answer» E. | |
| 778. |
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress. |
| A. | one-fourth |
| B. | one-third |
| C. | one-half |
| D. | double |
| Answer» C. one-half | |
| 779. |
For a shoe brake, the equivalent coefficient of friction is equal to (where = Actual coefficient of friction, and = Semi-block angle) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/594-455-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/594-455-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/594-455-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/594-455-4.png"> |
| Answer» E. | |
| 780. |
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/590-411-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/590-411-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/590-411-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/590-411-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/machine-design/590-411-4.png"> | |
| 781. |
When percentage of carbon in steel is increased, the ductility of steel decreases. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 782. |
The helix angle for double helical gears may be made up to |
| A. | 45 |
| B. | 60 |
| C. | 75 |
| D. | 90 |
| Answer» B. 60 | |
| 783. |
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 | |
| 784. |
The material generally used for air-craft components is |
| A. | mild steel |
| B. | high speed steel |
| C. | stainless steel |
| D. | aluminium |
| Answer» E. | |
| 785. |
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth. |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 786. |
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing |
| A. | remains constant at all speeds |
| B. | is minimum at zero speed and increases monotonically with increase in speed |
| C. | is maximum at zero speed and decreases monotonically with increase in speed |
| D. | becomes minimum at an optimum speed and then increases with further increase in speed |
| Answer» E. | |
| 787. |
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. | |
| 788. |
The working of metals above the recrystallisation temperature is known as hot working. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 789. |
According to Lame'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» D. none of these | |
| 790. |
For longitudinal 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» C. lap joint with one ring overlapping the other | |
| 791. |
The spigot and socket joint is mostly used for pipes which are burried in the earth. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 792. |
The permissible stress in the fillet weld is 100 N/mm2. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is |
| A. | 7.5 kN |
| B. | 10.6 kN |
| C. | 15 kN |
| D. | 22.5 kN |
| Answer» C. 15 kN | |
| 793. |
The most important dimension in the design of a nut is |
| A. | pitch diameter |
| B. | inside diameter |
| C. | outside diameter |
| D. | height |
| Answer» E. | |
| 794. |
Factor of safety for fatigue loading is the ratio of |
| A. | elastic limit to the working stress |
| B. | elastic limit to the yield point |
| C. | endurance limit to the working stress |
| D. | Young's modulus to the ultimate tensile strength |
| Answer» D. Young's modulus to the ultimate tensile strength | |
| 795. |
The shafts of larger diameter are usually forged and turned to size in a lathe. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 796. |
The ratio of the ultimate stress to the design stress is known as |
| A. | elastic limit |
| B. | strain |
| C. | factor of safety |
| D. | bulk modulus |
| Answer» D. bulk modulus | |
| 797. |
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by |
| A. | 0.5 mm upto rivet diameter of 24 mm |
| B. | 1 mm for rivet diameter from 27 mm to 36 mm |
| C. | 2 mm for rivet diameter from 39 mm to 48 mm |
| D. | all of the above |
| Answer» D. all of the above | |
| 798. |
The cam follower extensively used in air-craft engines is |
| A. | knife edge follower |
| B. | flat faced follower |
| C. | spherical faced follower |
| D. | roller follower |
| Answer» E. | |
| 799. |
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by |
| A. | increasing the length of bar |
| B. | decreasing the cross-sectional area of the bar |
| C. | decreasing the modulus of elasticity of the bar |
| D. | all of the above |
| Answer» E. | |
| 800. |
In helical bevel gearing, the axes of shafts are __________ and the teeth are curved. |
| A. | intersecting |
| B. | non-intersecting and non-parallel |
| Answer» C. | |