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.
| 651. |
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| Answer» D. | |
| 652. |
The included angle for the British standard whitworth thread is |
| A. | 29 |
| B. | 47.5 |
| C. | 55 |
| D. | 60 |
| Answer» D. 60 | |
| 653. |
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be |
| A. | same |
| B. | double |
| C. | one-half |
| D. | one-fourth |
| Answer» C. one-half | |
| 654. |
The transverse fillet welded joints are designed for |
| A. | tensile strength |
| B. | compressive strength |
| C. | bending strength |
| D. | shear strength |
| Answer» B. compressive strength | |
| 655. |
The centrifugal tension in the belt |
| A. | increases the power transmitted |
| B. | decreases the power transmitted |
| C. | has no effect on the power transmitted |
| D. | is equal to maximum tension on the belt |
| Answer» D. is equal to maximum tension on the belt | |
| 656. |
Failure of a material is called fatigue when it fails |
| A. | at the elastic limit |
| B. | below the elastic limit |
| C. | at the yield point |
| D. | below the yield point |
| Answer» E. | |
| 657. |
The application of second type levers is found in |
| A. | handle of a hand pump |
| B. | hand wheel of a punching press |
| C. | lever of a loaded safety valve |
| D. | a pair of tongs |
| Answer» D. a pair of tongs | |
| 658. |
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent bending 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» D. <img src="/_files/images/mechanical-engineering/machine-design/578-262-4.png"> | |
| 659. |
The spindles of bench vices are usually provided with knuckle threads. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 660. |
According to Indian standards, total number of tolerance grades are |
| A. | 8 |
| B. | 12 |
| C. | 18 |
| D. | 20 |
| Answer» D. 20 | |
| 661. |
The form factor of a helical gear __________ with the increase in the helix angle. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| Answer» B. decreases | |
| 662. |
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. | |
| 663. |
The thickness of key is usually taken equal to one-sixth of diameter of shaft. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 664. |
A bushed pin flexible coupling is used to connect two shafts whose axes intersect at a small angle. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 665. |
Which of the following property is essential for spring materials? |
| A. | Stiffness |
| B. | Ductility |
| C. | Resilience |
| D. | Plasticity |
| Answer» D. Plasticity | |
| 666. |
The buttress threads have low frictional resistance characteristic of the square threads and have the same strength of V-threads. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 667. |
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 |
| Answer» C. greater than | |
| 668. |
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» D. 80 to 90% | |
| 669. |
The buckling load will be maximum for a column, if |
| A. | one end of the column is clamped and the other end is free |
| B. | both ends of the column are clamped |
| C. | both ends of the column are hinged |
| D. | one end of the column is hinged and the other end is free |
| Answer» C. both ends of the column are hinged | |
| 670. |
The cap screws are |
| A. | slotted for a screw driver and are generally used with a nut |
| B. | similar to tap bolts except that they are of small size and a variety of shapes of heads are available |
| C. | used to prevent relative motion between the two parts |
| D. | none of the above |
| Answer» C. used to prevent relative motion between the two parts | |
| 671. |
In skew bevel gearing, the axes of shafts are |
| A. | intersecting and the teeth are curved |
| B. | non-intersecting and non-parallel and the teeth are curved |
| C. | non-intersecting and non-parallel and the teeth are straight |
| D. | none of the above |
| Answer» D. none of the above | |
| 672. |
A chain drive transmits __________ power as compared to belt drive. |
| A. | more |
| B. | less |
| Answer» B. less | |
| 673. |
A coupling used to connect two perfectly aligned shafts, is |
| A. | muff coupling |
| B. | compression coupling |
| C. | flange coupling |
| D. | all of these |
| Answer» E. | |
| 674. |
The ball bearings are, usually, made from |
| A. | low carbon steel |
| B. | high carbon steel |
| C. | medium carbon steel |
| D. | high speed steel |
| Answer» D. high speed steel | |
| 675. |
A connecting rod subjected to an axial load may buckle with |
| A. | X-axis as neutral axis |
| B. | Y-axis as neutral axis |
| C. | X-axis or Y-axis as neutral axis |
| D. | Z-axis |
| Answer» D. Z-axis | |
| 676. |
When the fulcrum is in between the load and effort, the lever is said to be of |
| A. | first type |
| B. | second type |
| C. | third type |
| D. | any one of these |
| Answer» B. second type | |
| 677. |
The efficiency of a square threaded screw is maximum if the helix angle is equal to (where = Angle of friction) |
| A. | 90 - |
| B. | 45 - |
| C. | 45 - /2 |
| D. | 45 + /2 |
| Answer» D. 45 + /2 | |
| 678. |
In designing thick cylinders, the equation used is |
| A. | Lame's equation |
| B. | Birnie's equation |
| C. | Clavarinos' equation |
| D. | all of these |
| Answer» E. | |
| 679. |
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B. |
| A. | twice |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» D. sixteen times | |
| 680. |
A double fillet welded joint with parallel fillet weld of length l and leg s is subjected to a tensile force P. Assuming uniform stress distribution, the shear stress in the weld is given by |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/570-169-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/570-169-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/570-169-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/570-169-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/machine-design/570-169-4.png"> | |
| 681. |
The radial distance from the __________ to the clearance circle is called working depth. |
| A. | addendum circle |
| B. | dedendum circle |
| Answer» B. dedendum circle | |
| 682. |
A key is normally made from a cold rolled mild steel bars. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 683. |
Which of following statement is correct, for the two shafts connected in parallel? |
| A. | Torque in each shaft is the same |
| B. | Shear stress in each shaft is the same |
| C. | Angle of twist of each shaft is the same |
| D. | Torsional stiffness of each shaft is the same |
| Answer» D. Torsional stiffness of each shaft is the same | |
| 684. |
A shaft is subjected to |
| A. | bending stresses |
| B. | shear stresses |
| C. | combined bending and shear stresses |
| D. | all of these |
| Answer» E. | |
| 685. |
The railway carriage couplings have |
| A. | square threads |
| B. | acme threads |
| C. | knuckle threads |
| D. | buttress threads |
| Answer» D. buttress threads | |
| 686. |
Lewis form factor for the 20 full depth involute system is equal to 0.154 - 0.841/T. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 687. |
The taper on cotter and slot is made on both the sides. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 688. |
The acme threads are usually found on |
| A. | spindles of bench vices |
| B. | railway carriage couplings |
| C. | feed mechanism of machine tools |
| D. | screw cutting lathes |
| Answer» E. | |
| 689. |
A cotter joint is used to transmit |
| A. | axial tensile load only |
| B. | axial compressive load only |
| C. | combined axial and twisting loads |
| D. | axial tensile or compressive loads |
| Answer» E. | |
| 690. |
The maximum efficiency of a square threaded screw is |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/586-363-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/586-363-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/586-363-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/586-363-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/586-363-2.png"> | |
| 691. |
In a steam engine, the piston rod is usually connected to the crosshead by means of a |
| A. | knuckle joint |
| B. | cotter joint |
| C. | oldham coupling |
| D. | universal joint |
| Answer» C. oldham coupling | |
| 692. |
Lewis equation is applied |
| A. | only to the pinion |
| B. | only to the gear |
| C. | to stronger of the pinion or gear |
| D. | to weaker of the pinion or gear |
| Answer» E. | |
| 693. |
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the pitch curve. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 694. |
A fast and loose pulley 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. | driven shaft is to be started or stopped whenever desired without interferring with the driving shaft |
| Answer» E. | |
| 695. |
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 |
| Answer» D. | |
| 696. |
In a flange coupling, the bolts are subjected to |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | none of these |
| Answer» D. none of these | |
| 697. |
The fatigue stress concentration factor is defined as |
| A. | the ratio of endurance limit with stress concentration to the endurance limit without stress concentration |
| B. | the ratio of endurance limit without stress concentration to the endurance limit with stress concentration |
| C. | the product of the endurance limits with and without stress concentration |
| D. | all of the above |
| Answer» C. the product of the endurance limits with and without stress concentration | |
| 698. |
A connecting rod subjected to an axial load may buckle in the plane of motion of the connecting rod. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 699. |
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will |
| A. | have contact at the bottom most of the bearing |
| B. | move towards right of the bearing making metal to metal contact |
| C. | move towards right of the bearing making no metal to metal contact |
| D. | move towards left of the bearing making metal to metal contact |
| Answer» D. move towards left of the bearing making metal to metal contact | |
| 700. |
In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where = Coefficient of friction between the blocks and the drum, = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/595-456-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/595-456-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/595-456-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/595-456-4.png"> |
| Answer» E. | |