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.
| 701. |
The ratio of number of teeth to the pitch circle diameter in millimetres is called circular pitch. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 702. |
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by |
| A. | equating tearing resistance of the plate to the shearing resistance of the rivets |
| B. | equating tearing resistance of the plate to the crushing resistance of the rivets |
| C. | equating shearing resistance to the crushing resistance of the rivets |
| D. | none of the above |
| Answer» D. none of the above | |
| 703. |
A tap bolt has |
| A. | threads for the nut at one end and head at the other end |
| B. | head at one end and the other end fits into a tapped hole of one of the parts to be fastened |
| C. | threads at both ends |
| D. | pointed threads |
| Answer» C. threads at both ends | |
| 704. |
The washer is generally specified by its |
| A. | outer diameter |
| B. | hole diameter |
| C. | thickness |
| D. | mean diameter |
| Answer» C. thickness | |
| 705. |
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing. |
| A. | partially |
| B. | fully |
| Answer» B. fully | |
| 706. |
Which of the following screw thread is adopted for power transmission in either direction? |
| A. | Acme threads |
| B. | Square threads |
| C. | Buttress threads |
| D. | Multiple threads |
| Answer» C. Buttress threads | |
| 707. |
In the assembly of pulley, key and shaft |
| A. | pulley is made the weakest |
| B. | key is made the weakest |
| C. | key is made the stongest |
| D. | all the three are designed for equal strength |
| Answer» C. key is made the stongest | |
| 708. |
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. | |
| 709. |
The radial distance from the top of a tooth to the bottom of a tooth is called clearance |
| A. | True |
| B. | False |
| Answer» B. False | |
| 710. |
The shock absorbing capacity of a bolt may be increased by |
| A. | increasing its shank diameter |
| B. | decreasing its shank diameter |
| C. | tightening the bolt properly |
| D. | making the shank diameter equal to core diameter of thread |
| Answer» C. tightening the bolt properly | |
| 711. |
The ratio of pitch circle diameter in millimetres to the number of teeth, is called |
| A. | circular pitch |
| B. | diametral pitch |
| C. | module |
| D. | none of these |
| Answer» D. none of these | |
| 712. |
A key made from a cylindrical disc having segmental cross-section, is known as |
| A. | feather key |
| B. | gib-head key |
| C. | wood ruff key |
| D. | flat saddle key |
| Answer» D. flat saddle key | |
| 713. |
A lap joint is always in single shear. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 714. |
A screw is said to be a self locking screw, if its efficiency is |
| A. | less than 50 % |
| B. | more than 50% |
| C. | equal to 50% |
| D. | none of these |
| Answer» B. more than 50% | |
| 715. |
An aluminium member is designed on the basis of |
| A. | yield stress |
| B. | elastic limit stress |
| C. | proof stress |
| D. | ultimate stress |
| Answer» B. elastic limit stress | |
| 716. |
A plate with a circular hole in the centre is subjected to a pull of P. The maximum stress induced at the edge of the hole is three times of the nominal stress. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 717. |
The cold working of metals is carried out __________ the recrystallisation temperature. |
| A. | above |
| B. | below |
| Answer» C. | |
| 718. |
The groove angle of the pulley for rope drive is usually |
| A. | 20 |
| B. | 35 |
| C. | 45 |
| D. | 60 |
| Answer» D. 60 | |
| 719. |
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 | |
| 720. |
Rankine Gordon formula for buckling is valid for |
| A. | long column |
| B. | short column |
| C. | short and long column |
| D. | very long column |
| Answer» D. very long column | |
| 721. |
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be |
| A. | 6 kN/m |
| B. | 12 kN/m |
| C. | 24 kN/m |
| D. | 30 kN/m |
| Answer» C. 24 kN/m | |
| 722. |
In the levers of third type, the mechanical advantage is __________ one. |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» B. equal to | |
| 723. |
The edges of the boiler plates are bevelled to an angle of |
| A. | 45 |
| B. | 60 |
| C. | 70 |
| D. | 80 |
| Answer» E. | |
| 724. |
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called |
| A. | repeated stress |
| B. | yield stress |
| C. | fluctuating stress |
| D. | alternating stress |
| Answer» D. alternating stress | |
| 725. |
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 | |
| 726. |
The process which improves the machinability of steels, but lowers the hardness and tensile strength is |
| A. | normalising |
| B. | full annealing |
| C. | process annealing |
| D. | spheroidising |
| Answer» E. | |
| 727. |
The material commonly used for machine tool bodies is |
| A. | mild steel |
| B. | aluminium |
| C. | brass |
| D. | cast iron |
| Answer» E. | |
| 728. |
A bolt has |
| A. | threads for the nut at one end and head at the other end |
| B. | head at one end and the other end fits into a tapped hole of one of the parts to be fastened |
| C. | threads at both ends |
| D. | pointed threads |
| Answer» B. head at one end and the other end fits into a tapped hole of one of the parts to be fastened | |
| 729. |
Lewis form factor for composite and full depth involute system is (where T = Number of teeth) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/601-533-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/601-533-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/601-533-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/601-533-2.png"> | |
| 730. |
The largest 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» C. pitch diameter | |
| 731. |
The power transmitted by a belt drive is maximum when the maximum tension in the belt is __________ the centrifugal tension. |
| A. | equal to |
| B. | double |
| C. | three times |
| D. | six times |
| Answer» D. six times | |
| 732. |
The stretching in a belt can be controlled by __________ the stress in the belt. |
| A. | reducing |
| B. | increasing |
| Answer» B. increasing | |
| 733. |
The design of shafts made of brittle materials is based on |
| A. | Guest's theory |
| B. | Rankine's theory |
| C. | St Venant's theory |
| D. | VonMises theory |
| Answer» C. St Venant's theory | |
| 734. |
A locking device extensively used in automobile industry is a |
| A. | jam nut |
| B. | castle nut |
| C. | sawn nut |
| D. | ring nut |
| Answer» C. sawn nut | |
| 735. |
A key way lowers |
| A. | the strength of the shaft |
| B. | the rigidity of the shaft |
| C. | both the strength and rigidity of the shaft |
| D. | the ductility of the shaft |
| Answer» D. the ductility of the shaft | |
| 736. |
According to maximum shear stress theory, the maximum shear stress in the shaft is |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/579-267-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/579-267-2.png"> | |
| 737. |
A jam nut is a locking device in which |
| A. | a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening |
| B. | a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears |
| C. | a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction |
| D. | the bottom cylindrical portion is recessed to receive the tip of the locking set screw |
| Answer» B. a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears | |
| 738. |
The difference between the upper limit and lower limit of a dimension is called |
| A. | nominal size |
| B. | basic size |
| C. | actual size |
| D. | tolerance |
| Answer» E. | |
| 739. |
Cast iron pipes are mainly used |
| A. | for conveying steam |
| B. | in water and sewage systems |
| C. | in pressure lubrication systems on prime movers |
| D. | all of the above |
| Answer» C. in pressure lubrication systems on prime movers | |
| 740. |
In a multiple V-belt drive, if one of the belts break, then |
| A. | only the broken belt is replaced |
| B. | the entire set of belts is replaced |
| C. | the broken belt and the belt on either side of it, is replaced |
| D. | the broken belt need not to be replaced |
| Answer» C. the broken belt and the belt on either side of it, is replaced | |
| 741. |
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity. |
| A. | heavier |
| B. | lighter |
| Answer» C. | |
| 742. |
The parallel fillet welded joints are designed for compressive strength. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 743. |
A spring of stiffness 1000 N/m is streteched 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. | |
| 744. |
In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing. |
| A. | thick film |
| B. | thin film |
| Answer» C. | |
| 745. |
The width of the pulley should be __________ width of the belt. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 746. |
A feather key transmits a turning moment and permits axial movement also. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 747. |
The design of the pressure vessel is based on |
| A. | longitudinal stress |
| B. | hoop stress |
| C. | longitudinal and hoop stress |
| D. | none of these |
| Answer» C. longitudinal and hoop stress | |
| 748. |
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be |
| A. | 15 |
| B. | 17 |
| C. | 21 |
| D. | 25 |
| Answer» C. 21 | |
| 749. |
For high speed engines, the cam follower should move with |
| A. | uniform velocity |
| B. | simple harmonic motion |
| C. | uniform accleration and retardation |
| D. | cycloidal motion |
| Answer» E. | |
| 750. |
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 | |