MCQOPTIONS
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MCQOPTIONS
This section includes 1003 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
The flank of the tooth is the |
| A. | Surface of the top of the tooth |
| B. | Surface of the tooth above the pitch surface |
| C. | Width of the tooth measured along the pitch circle |
| D. | Surface of the tooth below the pitch surface |
| Answer» E. | |
| 902. |
Buttress threads are usually found on |
| A. | Screw cutting lathes |
| B. | Feed mechanisms |
| C. | Spindles of bench vices |
| D. | Railway carriage couplings |
| Answer» E. | |
| 903. |
A shaft is subjected to |
| A. | Bending stresses |
| B. | Shear stresses |
| C. | Combined bending and shear stresses |
| D. | All of these |
| Answer» E. | |
| 904. |
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of |
| A. | Brown colour |
| B. | Yellow colour |
| C. | White colour |
| D. | Grey colour |
| Answer» E. | |
| 905. |
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 | |
| 906. |
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole) |
| A. | Less than 20d |
| B. | Greater than 30d |
| C. | Between 20d and 30d |
| D. | Equal to inside diameter of pipe |
| Answer» D. Equal to inside diameter of pipe | |
| 907. |
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. | |
| 908. |
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 | |
| 909. |
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as |
| A. | Angular bevel gears |
| B. | Crown bevel gears |
| C. | Internal bevel gears |
| D. | Miter gears |
| Answer» E. | |
| 910. |
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 | |
| 911. |
Which is correct statement? Stress concentration in static loading is |
| A. | Very serious in brittle materials and less serious in ductile materials |
| B. | Very serious in ductile materials and less serious in brittle materials |
| C. | Equally serious in both types of materials |
| D. | Seriousness would depend on other factors |
| Answer» B. Very serious in ductile materials and less serious in brittle materials | |
| 912. |
A spring is used to |
| A. | Measure forces |
| B. | Apply forces |
| C. | Store energy |
| D. | All of these |
| Answer» E. | |
| 913. |
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to$ |
| A. | pd/σt |
| B. | pd/2σt |
| C. | pd/3σt |
| D. | pd/4σt |
| Answer» E. | |
| 914. |
The shear modulus of resilience is proportional to |
| A. | Shear stress |
| B. | (Shear stress)² |
| C. | (Shear stress)3 |
| D. | (Shear stress)‚Å¥ |
| Answer» C. (Shear stress)3 | |
| 915. |
The longitudinal joint in boilers is used to get the required |
| A. | Length of boiler |
| B. | Diameter of boiler |
| C. | Length and diameter of boiler |
| D. | Efficiency of boiler |
| Answer» C. Length and diameter of boiler | |
| 916. |
In Vickers hardness testing, the pyramid indentor apex is |
| A. | 40° |
| B. | 122° |
| C. | 136° |
| D. | 152° |
| Answer» D. 152¬¨‚àû | |
| 917. |
The valve rod in a steam engine is connected to an eccentric rod by |
| A. | Cotter joint |
| B. | Bolted joint |
| C. | Knuckle joint |
| D. | Universal coupling |
| Answer» D. Universal coupling | |
| 918. |
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. | |
| 919. |
The objective of 'crowning' of the flat pulleys of belt drive is to |
| A. | Prevent the belt from running off the pulley |
| B. | Increase the power transmission capacity |
| C. | Increase the belt velocity |
| D. | Prevent the belt joint from damaging the belt surface |
| Answer» B. Increase the power transmission capacity | |
| 920. |
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. | |
| 921. |
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm) |
| A. | d = ‚à öt |
| B. | d = 1.6‚à öt |
| C. | d = 2‚à öt |
| D. | d = 6‚à öt |
| Answer» E. | |
| 922. |
A V-belt designated as B 4430 LP has |
| A. | 4430 mm as diameter of small pulley |
| B. | 4430 mm as nominal pitch length |
| C. | 4430 mm as diameter of large pulley |
| D. | 4430 mm as centre distance between pulleys |
| Answer» C. 4430 mm as diameter of large pulley | |
| 923. |
The property of a bearing material which has the ability to accommodate 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 | |
| 924. |
According to maximum normal stress theory, the maximum normal stress in the shaft is |
| A. | (1/2) √ó ‚à ö(œÉ¬≤ √ó 4œÑ¬≤) |
| B. | ‚à ö(œÉ¬≤ √ó 4œÑ¬≤) |
| C. | (1/2) √ó [œÉ + ‚à ö(œÉ¬≤ √ó 4œÑ¬≤)] |
| D. | œÉ + ‚à ö(œÉ¬≤ √ó 4œÑ¬≤) |
| Answer» D. ≈ì√â + ‚Äö√ √∂(≈ì√⬨‚⧠‚àö√≥ 4≈ì√묨‚â§) | |
| 925. |
A cotter joint is used to connect two __________ rods. |
| A. | Co-axial |
| B. | Perpendicular |
| C. | Parallel |
| D. | None of these |
| Answer» B. Perpendicular | |
| 926. |
According to Indian standards, total numbers of fundamental deviations are |
| A. | 10 |
| B. | 15 |
| C. | 20 |
| D. | 25 |
| Answer» E. | |
| 927. |
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. | |
| 928. |
The shear plane in case of bolts should |
| A. | Be across threaded portion of shank |
| B. | Be parallel to axis of bolt |
| C. | Be normal to threaded portion of shank |
| D. | Never be across the threaded portion |
| Answer» E. | |
| 929. |
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is |
| A. | Equal to 1/10 |
| B. | Less than 1/10 |
| C. | Greater than 1/10 |
| D. | None of these |
| Answer» D. None of these | |
| 930. |
The efficiency of a riveted joint is equal to |
| A. | Pt /P |
| B. | Ps /P |
| C. | Pc /P |
| D. | Least of Pt, Ps and Pc/P |
| Answer» E. | |
| 931. |
The coefficient of friction in belt drive depends upon |
| A. | Material of belt |
| B. | Material of pulley |
| C. | Materials of belt and pulley |
| D. | Belt velocity |
| Answer» D. Belt velocity | |
| 932. |
The stretching in a belt can be controlled by __________ the stress in the belt. |
| A. | Reducing |
| B. | Increasing |
| C. | Both A and B |
| D. | None of these |
| Answer» B. Increasing | |
| 933. |
A machine part subjected to _________ is called a strut. |
| A. | An axial compressive force |
| B. | A tangential force |
| C. | An axial tensile force |
| D. | Any one of these |
| Answer» B. A tangential force | |
| 934. |
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)$ |
| A. | 0.124 - (0.684/T) |
| B. | 0.154 - (0.912/T) |
| C. | 0.175 - (0.841/T) |
| D. | None of these |
| Answer» B. 0.154 - (0.912/T) | |
| 935. |
The number of slots in a 25 mm castle nut is |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 2 |
| Answer» B. 6 | |
| 936. |
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 | |
| 937. |
Auto frettage is the method of |
| A. | Joining thick cylinders |
| B. | Calculating stresses in thick cylinders |
| C. | Pre-stressing thick cylinders |
| D. | Increasing the life of thick cylinders |
| Answer» D. Increasing the life of thick cylinders | |
| 938. |
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as |
| A. | M6 |
| B. | M8 |
| C. | M6 - 8d |
| D. | M8 - 6d |
| Answer» D. M8 - 6d | |
| 939. |
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 | |
| 940. |
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length) |
| A. | (π/4) d² × τ × n |
| B. | 1.875 × (π/4) d² × τ × n |
| C. | 2 × (π/4) d² × τ × n |
| D. | 3 × (π/4) d² × τ × n |
| Answer» C. 2 ‚àö√≥ (≈ì√Ñ/4) d¬¨‚⧠‚àö√≥ ≈ì√ë ‚àö√≥ n | |
| 941. |
A universal coupling is used to connect two shafts |
| A. | Which are not in exact alignment |
| B. | Which are perfectly aligned |
| C. | Whose axes intersect at a small angle |
| D. | Have lateral misalignment |
| Answer» D. Have lateral misalignment | |
| 942. |
Silver based solder is used for |
| A. | Flaring |
| B. | Brazing |
| C. | Soft soldering |
| D. | Fusion welding |
| Answer» C. Soft soldering | |
| 943. |
The cam follower extensively used in aircraft engines is |
| A. | Knife edge follower |
| B. | Flat faced follower |
| C. | Spherical faced follower |
| D. | Roller follower |
| Answer» E. | |
| 944. |
Two closely coiled helical springs with stiffness k‚ÇÅ and k‚ÇÇ respectively are connected in series. The stiffness of an equivalent spring is given by# |
| A. | (k‚ÇÅ k‚ÇÇ)/ (k‚ÇÅ + k‚ÇÇ) |
| B. | (k‚ÇÅ - k‚ÇÇ)/ (k‚ÇÅ + k‚ÇÇ) |
| C. | (k‚ÇÅ + k‚ÇÇ)/ (k‚ÇÅ k‚ÇÇ) |
| D. | (k‚ÇÅ - k‚ÇÇ)/ (k‚ÇÅ k‚ÇÇ) |
| Answer» B. (k‚Äö√á√Ö - k‚Äö√á√á)/ (k‚Äö√á√Ö + k‚Äö√á√á) | |
| 945. |
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 | |
| 946. |
The elasticity is the property of a material which enables it to |
| A. | Regains its original shape after deformation when the external forces are removed |
| B. | Draw into wires by the application of a tensile force |
| C. | Resists 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 | |
| 947. |
The material used for brake lining should have __________ coefficient of friction. |
| A. | Low |
| B. | High |
| C. | Moderate |
| D. | None of these |
| Answer» C. Moderate | |
| 948. |
Creep in belt is due to |
| A. | Material of the belt |
| B. | Material of the pulley |
| C. | Uneven extensions and contractions due to varying tension |
| D. | All of the above |
| Answer» D. All of the above | |
| 949. |
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. | Both (A) and (B) |
| Answer» E. | |
| 950. |
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be# |
| A. | εc + 2εl |
| B. | 2εc + εl |
| C. | εc + εl² |
| D. | εc² + εl |
| Answer» C. ≈í¬µc + ≈í¬µl¬¨‚⧠| |