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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.
| 851. |
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.? |
| A. | One-eighth |
| B. | One-fourth |
| C. | One-half |
| D. | Double |
| Answer» B. One-fourth | |
| 852. |
Which of the following statement is correct?? |
| A. | The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials |
| B. | The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials |
| C. | The toughness of a material increases when it is heated |
| D. | The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres |
| Answer» C. The toughness of a material increases when it is heated | |
| 853. |
The permissible stress for carbon steel under static loading is generally taken as? |
| A. | 2000-3000 kg/m² |
| B. | 3000-4000 kg/cm² |
| C. | 4000-4500 kg/cm² |
| D. | 7500-10,000 kg/cm² |
| Answer» D. 7500-10,000 kg/cm¬¨‚⧠| |
| 854. |
When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a? |
| A. | Short bearing |
| B. | Long bearing |
| C. | Medium bearing |
| D. | Square bearing |
| Answer» E. | |
| 855. |
According to Indian standard specifications, 100 H6/g5 means that the? |
| A. | Basic size is 100 mm |
| B. | Actual size is 100 mm |
| C. | Difference between the actual size and basic size is 100 mm |
| D. | None of the above |
| Answer» B. Actual size is 100 mm | |
| 856. |
The longitudinal stress is __________ of the circumferential stress.? |
| A. | One-half |
| B. | Two-third |
| C. | Three-fourth |
| D. | Double |
| Answer» B. Two-third | |
| 857. |
The anti-friction bearings? |
| A. | Have low starting and low running friction at moderate speeds |
| B. | Have high initial cost |
| C. | Can carry both radial and thrust loads |
| D. | All of these |
| Answer» E. | |
| 858. |
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 strongest |
| D. | All the three are designed for equal strength |
| Answer» C. Key is made the strongest | |
| 859. |
The radial distance of a tooth from the pitch circle to the top of the tooth is called? |
| A. | Addendum |
| B. | Dedendum |
| C. | Clearance |
| D. | Working depth |
| Answer» B. Dedendum | |
| 860. |
A bolt of uniform strength can be developed by |
| A. | Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt |
| B. | Keeping the core diameter smaller than the diameter of the unthreaded portion |
| C. | Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt |
| D. | None of the above |
| Answer» B. Keeping the core diameter smaller than the diameter of the unthreaded portion | |
| 861. |
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod) |
| A. | 0.5 d |
| B. | 0.8 d |
| C. | d |
| D. | 1.2 d |
| Answer» D. 1.2 d | |
| 862. |
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. | |
| 863. |
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________. |
| A. | Neutral surface |
| B. | Upper surface |
| C. | Lower surface |
| D. | None of these |
| Answer» B. Upper surface | |
| 864. |
The property of a material which enables it to resist fracture due to high impact loads is known as |
| A. | Elasticity |
| B. | Endurance |
| C. | Strength |
| D. | Toughness |
| Answer» E. | |
| 865. |
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 | |
| 866. |
For applications involving high stresses in one direction only the following type of thread would be best suited |
| A. | ISO metric thread |
| B. | Acme thread |
| C. | Square thread |
| D. | Buttress thread |
| Answer» E. | |
| 867. |
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to |
| A. | Increase the key length |
| B. | Increase the key depth |
| C. | Increase the key width |
| D. | Decrease the key length |
| Answer» B. Increase the key depth | |
| 868. |
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension) |
| A. | P1 - P2 |
| B. | P1 + P2 |
| C. | ‚Öü‚ÇÇ √ó (P1 + P2) |
| D. | [‚Öü‚ÇÇ √ó (P1 + P2)] + Pc |
| Answer» D. [‚Äö√ñ√º‚Äö√á√á ‚àö√≥ (P1 + P2)] + Pc | |
| 869. |
A leaf spring in automobiles is used |
| A. | To apply forces |
| B. | To measure forces |
| C. | To absorb shocks |
| D. | To store strain energy |
| Answer» D. To store strain energy | |
| 870. |
The included angle in unified of American National threads is |
| A. | 60° |
| B. | 55° |
| C. | 47° |
| D. | 29° |
| Answer» B. 55¬¨‚àû | |
| 871. |
The toughness of a material _________ when it is heated |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of the Above |
| Answer» D. None of the Above | |
| 872. |
The suitable material for belt in agricultural machinery is |
| A. | Leather |
| B. | Rubber |
| C. | Cotton duck |
| D. | Balata gum |
| Answer» C. Cotton duck | |
| 873. |
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v). |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» E. | |
| 874. |
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to |
| A. | W/2 |
| B. | 2W/3 |
| C. | W/9 |
| D. | 8W/9 |
| Answer» C. W/9 | |
| 875. |
All stresses produced in a belt are |
| A. | Compressive stresses |
| B. | Tensile stresses |
| C. | Both tensile and compressive stresses |
| D. | Shear stresses |
| Answer» C. Both tensile and compressive stresses | |
| 876. |
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be$ |
| A. | τ/2 |
| B. | τ |
| C. | 2 τ |
| D. | 4 τ |
| Answer» C. 2 ≈ì√ë | |
| 877. |
Which of the following bearing is preferred for oscillating conditions? |
| A. | Double row roller bearing |
| B. | Taper roller bearing |
| C. | Angular contact single row ball bearing |
| D. | Needle roller bearing |
| Answer» E. | |
| 878. |
Tapered roller bearings can take |
| A. | Axial load only |
| B. | Both radial and axial loads and the ratio of these being greater than unity |
| C. | Radial load only |
| D. | Both radial and axial loads and the ratio of these being less than unity |
| Answer» C. Radial load only | |
| 879. |
In a marine flange coupling, the pitch circle diameter of bolts is taken as |
| A. | 1.2 d |
| B. | 1.6 d |
| C. | 2 d |
| D. | 2.5 d |
| Answer» C. 2 d | |
| 880. |
A steel containing up to 0.15% carbon is known as |
| A. | Mild steel |
| B. | Dead mild steel |
| C. | Medium carbon steel |
| D. | High carbon steel |
| Answer» C. Medium carbon steel | |
| 881. |
The stress induced in the belt is, |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Direct shear stress |
| D. | Torsional shear stress |
| Answer» B. Compressive stress | |
| 882. |
The value of stress concentration factor depends upon |
| A. | Material and geometry of the part |
| B. | Geometry of the part |
| C. | Material of the part |
| D. | None of these |
| Answer» E. | |
| 883. |
Plastic flow in ductile materials |
| A. | Increases the seriousness of static loading stress concentration |
| B. | Lessens the seriousness of static loading stress concentration |
| C. | Has no effect on it |
| D. | Depends on other considerations |
| Answer» C. Has no effect on it | |
| 884. |
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt) |
| A. | 0.5 d |
| B. | 0.75 d |
| C. | d |
| D. | 1.25 d |
| Answer» D. 1.25 d | |
| 885. |
In second type of levers, |
| A. | Load is in between the fulcrum and effort |
| B. | Effort is in between the fulcrum and load |
| C. | Fulcrum is in between the load and effort |
| D. | None of these |
| Answer» B. Effort is in between the fulcrum and load | |
| 886. |
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 | |
| 887. |
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material. |
| A. | Smaller |
| B. | Greater |
| C. | Medium |
| D. | None of these |
| Answer» C. Medium | |
| 888. |
When the belt is transmitting maximum power, |
| A. | The tension in tight side is twice the centrifugal tension |
| B. | The tension in slack side is equal to the centrifugal tension |
| C. | The tension in tight side is thrice the centrifugal tension |
| D. | None of the above |
| Answer» B. The tension in slack side is equal to the centrifugal tension | |
| 889. |
A type of brake commonly used in motor cars is a |
| A. | Shoe brake |
| B. | Band and block brake |
| C. | Band brake |
| D. | Internal expanding brake |
| Answer» E. | |
| 890. |
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that$ |
| A. | Shaft B is better than shaft A |
| B. | Shaft A is better than shaft B |
| C. | Both the shafts are equally good |
| D. | None of these |
| Answer» B. Shaft A is better than shaft B | |
| 891. |
The expansion joint is mostly used for pipes which carry steam at __________ pressures. |
| A. | Low |
| B. | High |
| C. | Medium |
| D. | None of these |
| Answer» C. Medium | |
| 892. |
Which of the following has threads at both ends? |
| A. | Bolt |
| B. | Tap bolt |
| C. | Stud |
| D. | None of these |
| Answer» D. None of these | |
| 893. |
A woodruff 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 | |
| 894. |
Which of the following cotter joint will be used to connect strap end of a connecting rod? |
| A. | Spigot and socket cotter joint |
| B. | Sleeve and cotter joint |
| C. | Gib and cotter joint |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 895. |
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon |
| A. | 0.20 to 0.40% |
| B. | 0.35 to 0.45% |
| C. | 0.40 to 0.60% |
| D. | None of these |
| Answer» C. 0.40 to 0.60% | |
| 896. |
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to |
| A. | 0.75/ (0.75 + ‚à öv) |
| B. | 3/ (3 + v) |
| C. | 4.5/ (4.5 + v) |
| D. | 6/ (6 + v) |
| Answer» B. 3/ (3 + v) | |
| 897. |
A saddle key __________ power through frictional resistance only. |
| A. | Transmits |
| B. | Does not transmit |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Does not transmit | |
| 898. |
For low and moderate speed engines, the cam follower should move with |
| A. | Uniform velocity |
| B. | Simple harmonic motion |
| C. | Uniform acceleration and retardation |
| D. | Cycloidal motion |
| Answer» C. Uniform acceleration and retardation | |
| 899. |
The ratio of pitch circle diameter in millimeters to the number of teeth, is called |
| A. | Circular pitch |
| B. | Diametral pitch |
| C. | Module |
| D. | None of these |
| Answer» D. None of these | |
| 900. |
For maximum power, the velocity of the belt will be |
| A. | ‚à ö(T/m) |
| B. | ‚à ö(T/2m) |
| C. | ‚à ö(T/3m) |
| D. | None of these |
| Answer» D. None of these | |