McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
What is the relation between variation due to observation, manufacturing process and measuring process of a product? |
| A. | σobservation = σprocess + σmeasurement |
| B. | σobservation = σprocess – σmeasurement |
| C. | σobservation = σprocess * σmeasurement |
| D. | σobservation = σprocess / σmeasurement |
| Answer» A. σobservation = σprocess + σmeasurement | |
| Explanation: the variation in the observation depends upon the variation in the product due to manufacturing process and variation due to measuring process. in order to keep σobservation minimum measurement should be kept minimum so that product as a whole is reliable. | |
| 2. |
movements? |
| A. | 0.04 mm |
| B. | 0.05 mm |
| C. | 0.07 mm |
| D. | 0.06 mm |
| Answer» D. 0.06 mm | |
| Explanation: the permissible error in the perpendicular motion of ocular microscope column w.r.t. the work stage over 100 mm movements is 0.06mm. | |
| 3. |
rotation in universal micrometer? |
| A. | dial indicator |
| B. | slip gauges |
| C. | control shaft |
| D. | universal microscope |
| Answer» C. control shaft | |
| Explanation: a special control shaft is used to check this where a right angled blade is provided at right angle to shaft diameter line. the ocular line is made to coincide with the blade and the column is titled, the shift in position of the ocular line is noted, this shift is the required error. | |
| 4. |
used for setting of helix angles in universal micrometer? |
| A. | 1’ |
| B. | 2’ |
| C. | 3’ |
| D. | 4’ |
| Answer» A. 1’ | |
| Explanation: the permissible error which is allowed in the entire range of column rotation is ± 5′. a clinometer is used to check this which is of 1′ least count. the clinometer is put over column top. given inclination is further checked with clinometer. | |
| 5. |
Which of the following is true for the calibration of instruments? |
| A. | in casting and fabrication shops the measurements made are of more precise nature as compared to those made in machine shop and tool room |
| B. | periodical calibration is made for optical measuring instruments |
| C. | there is no need of periodic calibration in universal microscope |
| D. | preventive maintenance is not necessary for optical measuring instruments |
| Answer» B. periodical calibration is made for optical measuring instruments | |
| Explanation: in machine shop and tool room the measurements made are of more precise than those made in casting and fabrication shops, so instruments used in these shops require more frequent calibration. annual programme can be made for periodical calibration and for general preventive maintenance in optical measuring instruments like universal microscope. | |
| 6. |
What is the permissible error in straight movement of longitudinal and transverse table in horizontal plane? |
| A. | 0.002 mm |
| B. | 0.003 mm |
| C. | 0.004 mm |
| D. | 0.005 mm |
| Answer» A. 0.002 mm | |
| Explanation: the permissible error in straight movement of longitudinal and transverse table is 0.002 mm in horizontal plane and 0.005 mm in vertical plane. this can be checked by using a rectangular straight edge and a dial indicator of least count 0.001 mm with an attachment for fixing dial indicator. | |
| 7. |
Which of the following is true for checking the Relative perpendicular motion of the longitudinal and transverse carriage? |
| A. | the permissible error allowed is 0.005 mm in 2500 mm length. |
| B. | this is checked using a slip gauges |
| C. | precision square of class i or 0 is used |
| D. | maximum error in precision error is of ± 10″ in squareness |
| Answer» C. precision square of class i or 0 is used | |
| Explanation: the permissible error allowed in this case is 0.005 mm in 1100 mm length. this can be done by using a precision square of class i or class 0 accuracy having a maximum error of ± 10″ in squareness. | |
| 8. |
What is the maximum permissible error in wear of centres? |
| A. | 0.04 mm |
| B. | 0.03 mm |
| C. | 0.02 mm |
| D. | 0.01 mm |
| Answer» D. 0.01 mm | |
| Explanation: the centres are set and checked for straightness. it can be observed while rotating the centres. the maximum error permissible for wear of centres is 0.01 mm. | |
| 9. |
What is the least count of dial indicators which can be calibrated using passmeter? |
| A. | 0.01 mm |
| B. | 0.03 mm |
| C. | 0.05 mm |
| D. | 0.07 mm |
| Answer» A. 0.01 mm | |
| Explanation: the dial indicators of least count 0.01 mm can be calibrated by using passmeter or by micrometer dial comparator of least count 0.002 mm. the dial indicators can also be calibrated using slip gauges. | |
| 10. |
Which of the following is caused bycareless handling? |
| A. | systematic error |
| B. | gross error |
| C. | random error |
| D. | none of the mentioned |
| Answer» B. gross error | |
| Explanation: gross errors are mostly due to lack of knowledge, judgment and care on the part of the experiment. that is gross error is caused by careless handling. | |
| 11. |
‘A system will be error free if we removeall systematic error’. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: random errors will remain in a system even if we remove all systematic errors. random errors are also known as residual errors. | |
| 12. |
Which of the following is not afundamental quantity? |
| A. | length |
| B. | angle |
| C. | time |
| D. | luminous intensity |
| Answer» B. angle | |
| Explanation: derived units are those expressed in terms of fundamental units. | |
| 13. |
Which standard is fixed and used forindustrial laboratories? |
| A. | international standard |
| B. | primary standard |
| C. | secondary standard |
| D. | working standard |
| Answer» C. secondary standard | |
| Explanation: secondary standards are fixed and used in industrial laboratories. working standards as its name suggests is used for day to day measurements. international standards are accepted internationally and primary standards are used in different parts of world which will not be accessible outside for calibration. | |
| 14. |
Which of the following error is caused bypoor calibration of the instrument? |
| A. | random error |
| B. | gross error |
| C. | systematic error |
| D. | precision error |
| Answer» C. systematic error | |
| Explanation: systematic errors are caused by poor calibration of instruments. | |
| 15. |
Starting position of an object is representedas x=5.1±0.2m and finishing position asy=6.9±0.3m. What will be the displacementand error in displacement? |
| A. | displacement = 1m, error = 0.5m |
| B. | displacement = 2m, error = 0.36m |
| C. | displacement = 1.8m, error = 0.36m |
| D. | displacement = 1.5m, error = 0.4m |
| Answer» C. displacement = 1.8m, error = 0.36m | |
| Explanation: displacement between two positions represented as x±Δx and y±Δy is iy- xi and error in displacement is (Δx2 | |
| 16. |
‘Zero error is an indication of instrumental error’. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: zero error refers to a false indication of an instrument when the true value is zero and zero error can be treated as an instrumental error. | |
| 17. |
Which of the following is not among the methods of linear measurements? |
| A. | direct measurements |
| B. | measurements by optical means |
| C. | indirect measurements |
| D. | electromagnetic methods or edm |
| Answer» C. indirect measurements | |
| Explanation: linear measurements are mainly divided into three heads. they are direct measurements, measurements by optical means, edm. | |
| 18. |
Which of the following is not a method of measuring the distances directly? |
| A. | pacing |
| B. | measurement with passometer |
| C. | measurement with pedometer |
| D. | measurement with theodolite |
| Answer» D. measurement with theodolite | |
| Explanation: measurements with theodolite is optical means. measurement with passometer, measurement with pedometer, pacing are based on the method of measuring the distances directly. | |
| 19. |
Which of the following measurements varies with an individual before computing the length of line? |
| A. | chaining |
| B. | pacing |
| C. | levelling |
| D. | contouring |
| Answer» B. pacing | |
| Explanation: length of a line is computed by knowing the average length of pace. pacing is a rough surveying. chaining gives almost accurate readings. taping gives accurate readings. | |
| 20. |
Which method consists in counting the number of paces between the two points of a line? |
| A. | chaining |
| B. | pacing |
| C. | levelling |
| D. | contouring |
| Answer» B. pacing | |
| Explanation: by definition of pacing chaining is measuring using different chains. levelling is a method used to estimate elevation of ground which is 2 dimensional. contouring gives three dimensional view of the site. | |
| 21. |
Pacing is difficult in |
| A. | smooth surfaces |
| B. | plain areas |
| C. | rough ground |
| D. | plateaus |
| Answer» C. rough ground | |
| Explanation: pacing is difficult in uneven | |
| 22. |
Which instrument mechanism is operated by motion of the body and it automatically registers the number of paces, thus avoiding the monotony and strain of counting the paces, by the surveyor? |
| A. | passometer |
| B. | pedometer |
| C. | odometer |
| D. | chaining |
| Answer» A. passometer | |
| Explanation: pedometer is a device similar to the passometer except that, adjusted to the length of the pace of the person carrying it. | |
| 23. |
Which instrument registers total distance covered by any number of pace? |
| A. | passometer |
| B. | pedometer |
| C. | odometer |
| D. | chaining |
| Answer» B. pedometer | |
| Explanation: pedometer advantage on passometer is that it registers total distance | |
| 24. |
Instrument for registering the number of revolutions of a wheel is |
| A. | odometer |
| B. | pedometer |
| C. | pedometer |
| D. | chaining |
| Answer» A. odometer | |
| Explanation: number of revolutions registered by odometer can then be multiplied by the circumference of the wheel to get the distance. pedometer advantage on passometer is it registers total distance covered unlike number of paces in passometer. | |
| 25. |
Most accurate method of direct measuring is with |
| A. | passometer |
| B. | pedometer |
| C. | theodolite |
| D. | chaining |
| Answer» D. chaining | |
| Explanation: theodolite measurement is not under direct measurements. measurement with passometer, measurement with pedometer, pacing is based on the method of measuring the distances directly. | |
| 26. |
Which of the following is not under direct measurement? |
| A. | pacing |
| B. | chaining |
| C. | taping |
| D. | triangulation |
| Answer» D. triangulation | |
| Explanation: triangulation is by optical means. pacing is rough surveying. chaining gives almost accurate readings. taping gives accurate readings. | |
| 27. |
ground? |
| A. | spirit level |
| B. | plumb bob |
| C. | butt rod |
| D. | pegs |
| Answer» B. plumb bob | |
| Explanation: it also transfers points from line ranger to the ground. spirit level is the instrument used to level the plane table by adjusting the spirit bubble in it to center. | |
| 28. |
What is used for measuring offsets, but it is often used by building surveyors or architects? |
| A. | plum bob |
| B. | butt rod |
| C. | pegs |
| D. | laths |
| Answer» B. butt rod | |
| Explanation: it generally consists of two laths, each of 1 yard or 1 m in length loosely tiered together. plumb bob is suspended at the center of the plane table to transfer the points on the plan to ground. | |
| 29. |
What is used in centering aid in theodolites, compass, plane table and variety of other surveying instruments? |
| A. | butt rod |
| B. | whites |
| C. | laths |
| D. | plumb bob |
| Answer» D. plumb bob | |
| Explanation: plumb bob transfers points to the ground so it is used for centering. butt are used for measuring offsets. | |
| 30. |
Which of the following option is incorrect about interchangeability? |
| A. | increase output |
| B. | increase cost of production |
| C. | useful in mass production |
| D. | assembly time increases |
| Answer» D. assembly time increases | |
| Explanation: an interchangeable part is one that can be replaced with a similar part manufactured to the same drawing. it can be used in mass production with an economic oriented approach. assembly time decreases as mating parts are interchangeable. | |
| 31. |
What are the main considerations for deciding the limits of a particular part? |
| A. | functional requirement |
| B. | economics and interchangeability |
| C. | interchangeability and functional requirement |
| D. | interchangeability, functional requirement and economics |
| Answer» D. interchangeability, functional requirement and economics | |
| Explanation: functional requirements are related to the function of a component that is what is required to do. interchangeability is for ease of replacement of part. economics is related to the minimum cost and time. | |
| 32. |
For full interchangeability, what is the relation between the process capability of a machine and manufacturing tolerance of the part? |
| A. | process capability = manufacturing tolerance |
| B. | process capability ≥ manufacturing tolerance |
| C. | process capability > manufacturing tolerance |
| D. | process capability ≤ manufacturing tolerance |
| Answer» D. process capability ≤ manufacturing tolerance | |
| Explanation: for full interchangeability, only such machines are selected for manufacturing whose process capability ≤ manufacturing | |
| 33. |
Which of the following option is correct in given statements about interchangeability? Statement 1: Standardisation is not so much of importance for interchangeability. Statement 2: Interchangeability follows ‘normal distribution’. |
| A. | f, t |
| B. | t, t |
| C. | f, f |
| D. | t, f |
| Answer» A. f, t | |
| Explanation: standardisation is important in interchangeability. it is essential to follow a common standard by all, only then interchangeability is possible. all standards used by the manufacturing unit are traceable to international standards. | |
| 34. |
Which of the following option is not correct for ‘full interchangeability’? |
| A. | this type of interchangeability is not feasible sometimes |
| B. | requires machine which can maintain low process capability |
| C. | machines with very high accuracy are necessary |
| D. | for interchangeable production, this type of interchangeability is not must |
| Answer» B. requires machine which can maintain low process capability | |
| Explanation: full interchangeability is also known as universal interchangeability. many times, universal interchangeability is not feasible because it requires machine capable of maintaining very high accuracy and high process capability. | |
| 35. |
What is the correct formula to find no. of groups in selective assembly? |
| A. | process capability / tolerance desired |
| B. | tolerance desired / process capability |
| C. | tolerance desired * process capability |
| D. | tolerance desired + process capability |
| Answer» A. process capability / tolerance desired | |
| Explanation: no. of groups segregated in selective assembly depends upon desired tolerance and process capability of machine. conditions like high quality and low cost can be achieved by selective assembly technique. | |
| 36. |
What is a limit system? |
| A. | series of tolerances |
| B. | series of fits |
| C. | series of clearances |
| D. | series of limits |
| Answer» A. series of tolerances | |
| Explanation: limit system is a series of tolerances arranged to suit a specific range of size. by this, limits of size are selected and given to mating parts to ensure specific classes of fit. | |
| 37. |
Which of the following is used to check change in ocular lines position due to column rotation in universal micrometer? |
| A. | dial indicator |
| B. | slip gauges |
| C. | control shaft |
| D. | universal microscope |
| Answer» C. control shaft | |
| Explanation: a special control shaft is used to check this where a right angled blade is provided at right angle to shaft diameter line. the ocular line is made to coincide with the blade and the column is titled, the shift in position of the ocular line is noted, this shift is the required error. | |
| 38. |
What is the least count of clinometer which is used to check reading of column rotation used for setting of helix angles in universal micrometer? |
| A. | 1’ |
| B. | 2’ |
| C. | 3’ |
| D. | 4’ |
| Answer» A. 1’ | |
| Explanation: the permissible error which is allowed in the entire range of column rotation is ± 5′. a clinometer is used to check this which is of 1′ least count. the clinometer is put over column top. given inclination is further checked with clinometer. | |
| 39. |
How 34’ can be built by using angle gauges? |
| A. | 27’+9’-3’+1’ |
| B. | 26’+10’-2’ |
| C. | 27’+10’-3’ |
| D. | 27’+8’ |
| Answer» A. 27’+9’-3’+1’ | |
| Explanation: combinations can be made by only three series of angle gauges. minutes series is with 1’, 3’, 9’, 27’ angle gauges. | |
| 40. |
In how many series the gauges can be divided? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| Explanation: 16 or 13 gauges can be divided into 3 series i.e. degree, minutes and seconds (fraction of minute). | |
| 41. |
What is the approximate size of angle gauges? |
| A. | 76mm long and 16 wide |
| B. | 85mm long and 26 wide |
| C. | 16mm long and 75 wide |
| D. | 70mm long and 18 wide |
| Answer» A. 76mm long and 16 wide | |
| Explanation: angle gauges are about 3 inch (76.2 mm) long and 5/8 inch (15.87 mm) wide. and their faces are lapped within 0.0002 mm. | |
| 42. |
What is the accuracy of master angle gauges? |
| A. | 0.1 sec |
| B. | 1 sec |
| C. | 0.25 sec |
| D. | 3 sec |
| Answer» C. 0.25 sec | |
| Explanation: master angle gauges are laboratory standard and most expensive of all. they measure the angle with an accuracy of | |
| 43. |
Which gauges are present in the first series (degree) of angle gauges? |
| A. | 5°, 10°, 15°, 25° and 40° |
| B. | 1°, 3°, 9°, 27° and 41° |
| C. | 1°, 5°, 9°, 25° and 45° |
| D. | 5°, 10°, 15°, 30° and 45° |
| Answer» B. 1°, 3°, 9°, 27° and 41° | |
| Explanation: the standard angles gauges have 5 gauges present in the first series. they consist of 1°, 3°, 9°, 27° and 41° gauges. | |
| 44. |
How many sets of angle gauges are available? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| Explanation: two sets of angle gauges are available. one set with 16 gauges with an accuracy of 1’’ and one set with 13 gauges with 3’’. | |
| 45. |
Statement 2: Interferometry can be used to calibrate angle gauges. |
| A. | t, f |
| B. | f, f |
| C. | f, t |
| D. | t, t |
| Answer» C. f, t | |
| Explanation: direct combination of angle gauges can be made up to angle 81o40.9’. for the larger angle, square block is used with angle gauges. | |
| 46. |
What are the two grades of angle gauges? |
| A. | master and tool room |
| B. | precise and normal |
| C. | standard and industrial |
| D. | high and low |
| Answer» A. master and tool room | |
| Explanation: master grade is laboratory standard and made from steel carbide or tungsten carbide. tool grade is normal industrial purpose angle gauges made from steel. | |
| 47. |
How angle greater than 90° is measured? |
| A. | by repeating gauges |
| B. | using square plate |
| C. | using sine bar |
| D. | using auto collimator |
| Answer» B. using square plate | |
| Explanation: versatility of angle gauges increases when used with a square plate. square plates with angle gauge can measure angle greater than 90o. | |
| 48. |
Which of the following is not a gauge from standard B angle gauges? |
| A. | 0.05’ |
| B. | 1’ |
| C. | 27’ |
| D. | 30 |
| Answer» A. 0.05’ | |
| Explanation: standard a has 13 gauges and standard b has all gauges from standard a except 0.05’ i.e. 12 gauges. | |
| 49. |
Which of the following is not true about metrology lasers used in laser inspection? |
| A. | these are high-power instruments |
| B. | used for rapid non-contact gauging of delicate parts |
| C. | have low optical cross-talk |
| D. | wide dynamic range |
| Answer» A. these are high-power instruments | |
| Explanation: these are low-power instruments. laser systems have wide dynamic range, high contrast and low optical cross-talk. laser systems can be used in inspection of surfaces and in dimensional measurements and are very useful in precision and accuracy measurements. | |
| 50. |
What is the wavelength of light produced by He-Ne laser in laser inspection? |
| A. | 6988 Å |
| B. | 5328 Å |
| C. | 5928 Å |
| D. | 6328 Å |
| Answer» D. 6328 Å | |
| Explanation: he-ne lasers are used in laser inspection. light produced by he-ne lasers is at a wavelength of 6328 Å or 0.6 μm and that is in phase and coherent. this source is a 1000 times more intense than other monochromatic sources. | |
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