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.
| 851. |
Which of the following is an antifriction bearing? |
| A. | journal bearing |
| B. | pedestal bearing |
| C. | collar bearing |
| D. | needle bearing |
| Answer» E. | |
| 852. |
A connecting rod is four times strong in buckling about Y-axis than about X-axis. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 853. |
A steel containing more than 0.8% carbon is known as eutectoid steel. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 854. |
Which of the following statement is correct regarding power screws? |
| A. | The efficiency of a self locking screw can not be more than 50% |
| B. | The efficiency of Acme (trapezoidal) thread is less than that of a square thread |
| C. | If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% |
| D. | (A) and (B) Only |
| Answer» E. | |
| 855. |
In an ordinary bolt, the effect of the impulsive loads applied axially is concentrated on the cross-sectional area at the root of the threads. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 856. |
In leaf springs, the longest leaf is known as |
| A. | lower leaf |
| B. | master leaf |
| C. | upper leaf |
| D. | none of these |
| Answer» C. upper leaf | |
| 857. |
The taper on cotter varies from |
| A. | 1 in l5 to 1 in 10 |
| B. | 1 in 24 to 1 in 20 |
| C. | 1 in 32 to 1 in 24 |
| D. | 1 in 48 to 1 in 24 |
| Answer» E. | |
| 858. |
Which of the following screw thread is used for power transmission in one direction only. |
| A. | Acme threads |
| B. | Square threads |
| C. | Buttress threads |
| D. | Multiple threads |
| Answer» D. Multiple threads | |
| 859. |
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be __________ the bearing modulus. |
| A. | 5 times |
| B. | 10 times |
| C. | 15 times |
| D. | 20 times |
| Answer» D. 20 times | |
| 860. |
The rolling contact bearings as compared to sliding contact bearings have |
| A. | small overall dimensions |
| B. | accuracy of shaft alignment |
| C. | low starting and low running friction except at very high speeds |
| D. | all of the above |
| Answer» E. | |
| 861. |
The maximum normal stress theory is used for |
| A. | brittle materials |
| B. | ductile materials |
| C. | plastic materials |
| D. | non-ferrous materials |
| Answer» B. ductile materials | |
| 862. |
When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as |
| A. | spur gearing |
| B. | helical gearing |
| C. | bevel gearing |
| D. | spiral gearing |
| Answer» E. | |
| 863. |
When a nut is tightened by placing a washer below it, the bolt will be subjected to |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | none of these |
| Answer» B. compressive stress | |
| 864. |
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 | |
| 865. |
If the tearing efficiency of a riveted joint is 50%, then the ratio of diameter of rivet to the pitch is |
| A. | 0.20 |
| B. | 0.30 |
| C. | 0.50 |
| D. | 0.70 |
| Answer» D. 0.70 | |
| 866. |
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is |
| A. | 1/2 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 867. |
A riveted joint is a __________ fastening. |
| A. | permanent |
| B. | temporary |
| Answer» B. temporary | |
| 868. |
A flange coupling is used to connect two shafts |
| A. | which are perfectly aligned |
| B. | which are not in exact alignment |
| C. | have lateral misalignment |
| D. | whose axes intersect at a small angle |
| Answer» B. which are not in exact alignment | |
| 869. |
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is |
| A. | tensile stress |
| B. | compressive stress |
| C. | shear stress |
| D. | bending stress |
| Answer» D. bending stress | |
| 870. |
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called |
| A. | working depth |
| B. | clearance |
| C. | face width |
| D. | backlash |
| Answer» E. | |
| 871. |
When a load W is suddenly applied to a bar of weight W1, the stress induced in the bar will increase with the increase in weight W1. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 872. |
The endurance limit for a mirror polished material will be __________ as compared to unpolished material. |
| A. | same |
| B. | less |
| C. | more |
| Answer» D. | |
| 873. |
A sliding bearing which operates without any lubricant present, is called |
| A. | zero film bearing |
| B. | boundary lubricated bearing |
| C. | hydrodynamic lubricated bearing |
| D. | hydrostatic lubricated bearing |
| Answer» B. boundary lubricated bearing | |
| 874. |
The material used for brake lining should have __________ coefficient of friction. |
| A. | low |
| B. | high |
| Answer» C. | |
| 875. |
In a gear, having involute teeth, the normal to the involute is a tangent to the |
| A. | pitch circle |
| B. | base circle |
| C. | addendum circle |
| D. | dedendum circle |
| Answer» C. addendum circle | |
| 876. |
The radial distance of a tooth from the pitch circle to the top of the tooth is called |
| A. | dedendum |
| B. | addendum |
| C. | clearance |
| D. | working depth |
| Answer» C. clearance | |
| 877. |
Screws jacks have multiple threads. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 878. |
The elasticity 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» B. draw into wires by the application of a tensile force | |
| 879. |
The wear load should be __________ the dynamic load. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 880. |
When two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft, the arrangement is known as spiral gearing. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 881. |
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called |
| A. | normal pitch |
| B. | axial pitch |
| C. | diametral pitch |
| D. | module |
| Answer» C. diametral pitch | |
| 882. |
Which of the following formula is used in designing a connecting rod ? |
| A. | Euler's formula |
| B. | Rankine's formula |
| C. | Johnson's straight line formula |
| D. | Johnson's parabolic formula |
| Answer» C. Johnson's straight line formula | |
| 883. |
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is |
| A. | 0.20 |
| B. | 0.35 |
| C. | 0.50 |
| D. | 0.65 |
| Answer» D. 0.65 | |
| 884. |
The lead angle of a worm is 22.5 . Its helix angle will be |
| A. | 22.5 |
| B. | 45 |
| C. | 67.5 |
| D. | 90 |
| Answer» D. 90 | |
| 885. |
The root angle of a bevel gear is equal to |
| A. | pitch angle - addendum angle |
| B. | pitch angle + addendum angle |
| C. | pitch angle - dedendum angle |
| D. | pitch angle + dedendum angle |
| Answer» D. pitch angle + dedendum angle | |
| 886. |
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T1, and T2 = Tensions on the tight and slack sides of belt respectively, = Coefficient of friction, between the belt and pulley, and = Angle of contact) |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/588-386-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/588-386-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/588-386-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/588-386-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/machine-design/588-386-4.png"> | |
| 887. |
A flange coupling is a type of rigid coupling. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 888. |
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is |
| A. | 1 kN-m |
| B. | 2 kN-m |
| C. | 3 kN-m |
| D. | 4 kN-m |
| Answer» D. 4 kN-m | |
| 889. |
The design of pin of a rocker arm of an I.C. engine is based on |
| A. | bearing failure |
| B. | shearing failure |
| C. | bending failure |
| D. | all of these |
| Answer» E. | |
| 890. |
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to |
| A. | <img src="/_files/images/mechanical-engineering/machine-design/601-536-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/machine-design/601-536-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/machine-design/601-536-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/machine-design/601-536-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/machine-design/601-536-2.png"> | |
| 891. |
The property of a bearing material which has the ability to accomodate small particles of dust, grit etc. without scoring the material of the journal, is called |
| A. | bondability |
| B. | embeddability |
| C. | comformability |
| D. | fatigue strength |
| Answer» C. comformability | |
| 892. |
The shock resistance of steel is increased by adding |
| A. | nickel |
| B. | chromium |
| C. | nickel and chromium |
| D. | cobalt and molybedenum |
| Answer» D. cobalt and molybedenum | |
| 893. |
In a V-belt drive, the belt makes contact at the bottom of the groove of the pulley. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 894. |
A wood-ruff key is |
| A. | a tapered key with head at one end |
| B. | fitted in pairs at right angles |
| C. | capable of tilting in a recess milled out in the shaft |
| D. | all of the above |
| Answer» D. all of the above | |
| 895. |
For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 10 |
| Answer» B. 6 | |
| 896. |
The bearings of heavy series have capacity __________ over the medium series. |
| A. | 10 to 20% |
| B. | 20 to 30% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» C. 30 to 40% | |
| 897. |
In block brakes, the ratio of shoe width to wheel diameter is taken between |
| A. | 0.1 and 0.25 |
| B. | 0.25 and 0.50 |
| C. | 0.50 and 0.75 |
| D. | 0.75 and 1 |
| Answer» C. 0.50 and 0.75 | |
| 898. |
Oldham coupling is used to transmit power between two parallel shafts which are slightly offset. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 899. |
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is |
| A. | 2000 N-m |
| B. | 2050 N-m |
| C. | 2100 N-m |
| D. | 2136 N-m |
| Answer» E. | |
| 900. |
When a machine member is subjected to torsion, the torsional shear stress set up in the member is |
| A. | zero at both the centroidal axis and outer surface of the member |
| B. | maximum at both the centroidal axis and outer surface of the member |
| C. | zero at the centroidal axis and maximum at the outer surface of the member |
| D. | maximum at the centroidal axis and zero at the outer surface of the member |
| Answer» D. maximum at the centroidal axis and zero at the outer surface of the member | |