This is the Multiple Choice Questions Part 6 of the Series in Machine Design as one of the Mechanical Engineering topic. In Preparation for the ME Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Mechanical Engineering field, Mechanical Engineering Books, Journals and other ME References. I assume you are looking for a reviewer that will help you achieve your goal to become a License Mechanical Engineer very soon. Yes, you are in the right place to make your dream come true. Make sure to familiarize each and every questions to increase the chance of passing the Mechanical Board Examination.

#### MCQ Topic Outline included in ME Board Exam Syllabi

- MCQ in Stress and Analysis – Simple Stresses
- MCQ in Materials and their Properties
- MCQ in Tolerances and Allowances
- MCQ in Variable Loads and Stress Concentration
- MCQ in Columns and Central Loads
- MCQ in Combine Stresses
- MCQ in Ball and Roller Bearings
- MCQ in Journal and Plane-Surface Bearings
- MCQ in Flexible transmission, flat belts, v-belts, and chains
- MCQ in Screw Fastening and Rivets
- MCQ in Springs
- MCQ in Shafts
- MCQ in Keys and Couplings
- MCQ in Journal and Plane-Surface Bearings
- MCQ in Spur Gears
- MCQ in Helical Gears
- MCQ in Bevel Gears
- MCQ in Worm Gearing
- MCQ in Brakes and Clutches
- MCQ in Welding
- MCQ in Thin Cylinders and Cylindrical Cylinders
- MCQ in Steel Tubes
- MCQ in Flat Plates
- MCQ in Flywheels
- MCQ in Punch Press
- MCQ in Pipe and Fittings
- MCQ in Engineering Drawings Practices

#### Continue Practice Exam Test Questions Part 6 of the Series

โ MCQ in Machine Design Part 5 | ME Board Exam

**Choose the letter of the best answer in each questions.**

251. Shaftingย upย toย 3ย inchesย inย diameterย isย usuallyย madeย fromย cold rolled steel andย the common biggest diameterย of cold rolled steel is ____.

A. 4 ยผ inches

B. 6 7/8 inches

C. 6 ยพ inches

D. 5 inches

Answer: **Option D**

Explanation:

252. Itย isย idealย forย maximumย quietnessย inย sprocketsย driveย operationย to choose _____ or more teeth

A. 24

B. 18

C. 27

D. 21

Answer: **Option C**

Explanation:

253. All associated with standard material specification except

A. American Iron and Steel Institute

B. Society of Automotive Engineers

C. Southeast Asia Iron and Steel Institute

D. American Society for Testing Materials

Answer: **Option C**

Explanation:

254. For stable equipment foundation the total combined engine driven equipmentย andย foundationย centerย ofย gravityย mustย beย keptย below theย foundationโsย tooย thatย usuallyย about ______ย timesย theย usual total combined weight of the machinery it is supposed to support.

A 3 to 4

B. 3 to 7

C. 2 to 4

D. 3 to 5

Answer: **Option D**

Explanation:

255. A triple thread worm has a pitch diameter of 3 inches. The wheel hasย 25ย teethย andย aย pitchย diameterย ofย 5ย inches.ย Materialย forย both the worm and the wheel is of phosphor bronze. Compute the helix angle (Tan ฮฑ)

A. 0.20

B. 0.30

C. 0.40

D. 14

Answer: **Option A**

Explanation:

256. Aย cylinderย tankย withย 10โย insideย diameterย containsย oxygenย gasย at 2500ย psi.ย Calculateย theย requiredย wallย thicknessย inย (mm)ย under stress of 28 000 psi

A. 11.34 mm

B. 10.24 mm

C. 12.44 mm

D. 10.54 mm

Answer: **Option A**

Explanation:

257. Theย processย ofย peeningย theย jointย portionย immediatelyย afterย the weldingย greatlyย improvesย theย fusionย structuresย avoidsย possible cracking,ย avoidsย possibleย distortionย etc.ย Peeningย canย also _______ process at the same time

A. tempering

B. martampering

C. normalizing

D. annealing

Answer: **Option A**

Explanation:

258. The distance between rivet center nearest each other in adjacent rows is called ______

A. pitch

B. back pitch

C. margin

D. diagonal pitch

Answer: **Option D**

Explanation:

259. A major alloy in tool steel

A. Cr

B. Fen

C. Cobalt

D. Mn

Answer: **Option A**

Explanation:

260. Aย ruleย ofย thumbย theย speedย limitย ofย flywheelย rimย speedย shouldย be 6000ย fpmย forย castย ironย materialย andย forย castย steelย flywheelย rimย at _______ meters/min

A. 3050

B. 4500

C. 7000

D. 10000

Answer: **Option D**

Explanation:

261. Shouldย twoย equalย andย oppositeย collinearย forcesย isย addedย toย the forcesย alreadyย inย equilibrium,ย whichย ofย theย followingย statementย is true?

A. Unbalanced moment is maintained

B. Equilibrium is maintained

C. Equilibrium is disturbed

D. it creates an unbalanced situation

Answer: **Option B**

Explanation:

262. Aย pairย ofย gearย withย gearย ratioย ofย 3ย andย 60ย gearย teethย ofย 14 ยฝ degreeย fullย depthย tooth.ย Theย diametralย pitchย isย 10.ย Computeย the tooth thickness on the pitch circle

A. 0.570 inch

B. 0.352 inch

C. 0.157 inch

D. 0.142 inch

Answer: **Option C**

Explanation:

263. __________ย additionย impartsย resistanceย toย atmosphericย corrosion in steel etc.

A. aluminum bronze

B. manganese

C. copper

D. bronze

Answer: **Option C**

Explanation:

264. Theย widthย ofย aย toothย spaceย exceedsย theย thicknessย ofย eachย ofย the engaging tooth on the pitch circle ________

A. allowance

B. bottom land

C. top land

D. backlash

Answer: **Option D**

Explanation:

265. Distance measured perpendicular to the axis between the crest of the thread and the root of its mating thread in a thread assembly of screws

A. tolerance class

B. crest truncation

C. crest clearance

D. tolerance limit

Answer: **Option C**

Explanation:

266. Percentageย ofย cutย onย theย returnย strokeย ofย hacksawย blade is________

A. 21

B. 3 %

C. 1 %

D. 0 %

Answer: **Option D**

Explanation:

267. Compute the angle required in degrees, for the road to be slanted to prevent an automobile travelling at 25 m/s from tending to slip. The radius of curvature is 200 m.

A. 21

B. 14

C. 18

D. 16

Answer:

Explanation:

268. __________ is also called strain hardening

A. work hardening

B. quenching

C. annealing

D. normalizing

Answer: **Option A**

Explanation:

269. Imaginaryย formedย byย theย intersectionย ofย theย flanksย ofย aย thread when extended is called _______

A. Sharp Crest

B. Sharp root

C. Root apex

D. All of these

Answer: **Option D**

Explanation:

270. Computeย theย maximumย deflectionย ofย aย 20ย coilsย helicalย spring having a load of 75 kgs. The spring is a square/ground ends with modulusย ofย elasticityย inย shearย ofย 79.84ย GPaย outsideย diameterย of 101.6 mm wire diameter of a 9525 mm

A. 140.7 mm

B. 112.7 mm

C. 15.17 mm

D. 126.7 mm

Answer: **Option D**

Explanation:

271. _______ forces means when their linesย of action can be extended to meet to one point

A. concurrent

B. centroids

C. collinear

D. resultants

Answer: **Option A**

Explanation:

272. Theย weldedย jointsย permitย placingย theย addedย metalย exactlyย where neededย andย produceย anย integralย structureย whichย can develop _____% efficiency on any thickness of section specially for mild steel materials

A. 95%

B. 85%

C. 100%

D. 90%

Answer: **Option C**

Explanation:

273. Aย keyedย sprocketย deliverย aย torqueย ofย 778ย 8ย Nmย thruย theย shaftย of 54 mm OD . The key thickness is 1. 5875 cm and the width is 1.11 cmย computeย theย lengthย ofย theย sameย key.ย Theย permissibleย stress value of 60 MPa for shear and 90 MPa for tension

A. 39.12 cm

B. 4.82 cm

C. 52.22 cm

D. 4.32 cm

Answer: **Option D**

Explanation:

274. Computeย theย cuttingย speedย inย fpmย ofย aย workpieceย withย 2ย inches diameter and running at 100 rpm?

A. 72

B. 102

C. 62

D. 52

Answer: **Option D**

Explanation:

275. One horsepower is equal to _____________

A. 556 ft.lb/sec

B. 748 Nm/sec

C. 746 joules/sec

D. 42.4 BTU/min.

Answer: **Option C**

Explanation:

276. Compute the diameter of a solid shaft transmitting 75 Hp at 1800 rpm.ย Theย natureย ofย theย loadย andย theย typeย ofย serviceย isย suchย that the allowable Ss based on pure torsion is 6000 psi

A. 1 7/8โ

B. 2 1/16โ

C. 1 5/16โ

D. 3 1/8โ

Answer: **Option C**

Explanation:

277. Compute the safe wall thickness of a 76.2 cm diameter steel tank. The tank is subjected to 7.33 MPa pressure and the steel material has yield stress of 215.4 MPa. The factor of safety to use is 3

A. 1 ยฝ inches

B. 3.89 cm

C. 4.09 cm

D. 3.69 cm

Answer: **Option B**

Explanation:

278. A foot rule has how many 1/8โ?

A. 96

B. 48

C. 120

D. 108

Answer: **Option A**

Explanation:

279. An elevator weighing 2000 lbs. is moving vertically upward with an accelerationย ofย 3ย ft./sec^{2}.ย Aย man standingย inย saidย elevatorย weighs 180ย lbs.ย Computeย theย tensionย inย theย supportingย cableย underย this condition

A. 2180 lbs.

B. 2191 lbs.

C. 1820 lbs.

D. 2366 lbs.

Answer: **Option D**

Explanation:

280. A watt is equivalent to _________

A. 42.4 BTU/min.

B. 1 Nm/sec

C. 44.20 ft.lb/min.

D. all of these

Answer: **Option B**

Explanation:

281. 50% of ยฝ is

A. 1/100

B. 0.25

C. 25

D. 001

Answer: **Option B**

Explanation:

282. The capsule orbits of the earth 180 km above the surface. In what velocityย inย m/sย necessaryย forย aย circularย orbitย condenserย theย earth radius at 6400-km and at 9.2 m/sec^{2}?

A. 8864

B. 7016

C. 7780

D. 8058

Answer: **Option C**

Explanation:

283. Aย smallย countershaftย isย 1 1/2ย inchย inย diameterย andย hasย an allowable stress of 8500 psi. Find the horsepower delivered by the shaft at a speed of 125.7 rad/sec.

A. 720

B. 1.4

C. 13.31

D. 14.72

Answer: **Option C**

Explanation:

284. A wheel accelerates from rest with a = 5 radian/sec-sec. Compute how many revolutions made in 4 seconds?

A. 5.71 rev

B. 6.36 rev

C. 7.00 rev

D. 20.00 rev

Answer: **Option B**

Explanation:

285. The shaft is subjected to a steady load of 36,000 in lb. at a shear stressย ofย 10,000ย psi.ย Computeย theย diameterย ofย theย saidย shaftย in inches

A. 1 7/8

B. 2 ยผ

C. 3

D. 2 ยพ

Answer: **Option C**

Explanation:

286. Whatย minimumย distanceย canย aย truckย sideย onย aย horizontalย asphalt roadย ifย itย isย travellingย 25ย m/s?ย Theย coefficientย ofย slidingย friction between asphalt and rubberย tire is at 0.6. the weight of the truck is 8500 kg.

A. 44.9

B. 58.5

C. 53.2

D. 63.8

Answer: **Option C**

Explanation:

287. A Keyed gears deliver a torque of 912.4 Nm thru its shaft of 63.5 mm outside diameter. If the key has thickness of 15.875 mm and widthย ofย 11.1125ย findย theย lengthย ofย theย key.ย Assumeย the permissibleย stressย valuesย ofย 61.2ย MPaย forย shearย andย tensionย at 99.8 MPa.

A. 47.42 mm

B. 39.72 mm

C. 42.22 mm

D. 46.92 mm

Answer: **Option C**

Explanation:

288. Aย bandย brakeย isย toย absorbย 5 Hpย atย 200 rpm.ย Theย maximum pressure of the lining and drum is 120 psi. the angle of wrap is 3.6 radiansย theย widthย ofย theย bandย is 3 inchesย andย fย =ย 0ย 15.ย Findย the forces at the tight side. The diameter of the drum is at 8 inches

A. 2680 lbs.

B. 2880 lbs.

C. 3880 lbs.

D. 2980 lbs.

Answer: **Option B**

Explanation:

289. Aย liquidย fullย bucketย isย toย beย rotatedย inย theย verticalย plane.ย What minimumย angularย velocityย inย radian/secย isย neededย toย keepย the liquid no spilling out if the rotating arm is 1.2 meters

A. 2.26

B. 25.6

C. 3.10

D. 2.86

Answer: **Option D**

Explanation:

290. Computeย theย speedย aย satelliteย mustย haveย toย orbitย theย earthย atย an elevationย ofย 100ย km.ย Earthโsย radiusย isย atย 6400ย km.ย Assume no change of gravity with the elevation

A. 6320 m/s

B. 7120 m/s

C. 8740 m/s^{2}

D. 7920 m/s

Answer: **Option D**

Explanation:

291. Aย 16ย ft.ย steelย lineshaftย hasย noย bendingย actionย exceptย itsย own weight. What power in Hp can the shaft deliver at a speed of 200 rpm. Consider that the torsional deflection will not exceed 0.008/ft. of length

A. 13.2

B. 15.8

C. 24.4

D. 14.6

Answer: **Option D**

Explanation:

292. The torsional deformation of a SAE 1040 steel shaft is to 0.8ยฐ in a lengthย ofย ยฝย meter.ย Theย shearย stressย isย 69ย Mpa.ย Computeย the diameterย ofย theย shaftย inย millimeter.ย Steelย modulusย ofย elasticityย is 79,300 Mpa or N/mm^{2}

A. 51

B. 50

C. 75

D. 62

Answer: **Option D**

Explanation:

293. Computeย howย manyย 3/8ย inchย diameterย setย screwsย requiredย to transmit 3 Hp at a shaft speed of 1000 rpm. The shaft diameter is 1 inch

A. 1 ยฝ

B. 2

C. 3

D. 1

Answer: **Option B**

Explanation:

294. Aย pairย ofย gear/pinionย ofย 42ย toothย andย 18ย toothย withย aย diametral pitchย ofย 0.7874ย teeth/cmย andย theย addendumย isย 0.8/pย and dedendumย 1/p.ย Theย gearย pressureย angleย ofย 20ยฐ.ย Computeย the center distance of the pair of gears in meters

A. 0.5026 m

B. 0.3426 m

C. 0.3516 m

D. 0.4013 m

Answer: **Option D**

Explanation:

295. Determineย theย widthย ofย aย 6ย plyย rubberย beltย requiredย forย a ventilating fan running at 150 rpm driven from a 12 inch pulley on a 70 Hp at 800 rpm. The center distance between pulley is 12 ft. and the rated belt tension is 78.0 lb/in width

A. 12โ

B. 8โ

C. 10โ

D. 15โ

Answer: **Option A**

Explanation:

296. Computeย forย theย torsionalย deflectionย inย degreesย ofย aย 110ย mm diameter, 1.4 m long shaft subjected to a twisting moment of 3 x 10^{6} N-mm. The torsional modulus of elasticity is 83000 N/mm^{2}

A. 0.27

B. 0.31

C. 0.20

d. 0.24

Answer: **Option C**

Explanation:

297. Find theย torsional moment (in Newton-mm ) developed when the shaft delivers 20 kw at 200 rpm

A. 0.85 x 10^{6}

B. 1.0 x 10^{6ย }

C. 1.20 x 10^{6}

D. 2.10 x 10^{6}

Answer: **Option B**

Explanation:

298. Determineย theย loadย inย kNย onย aย 25ย mmย diameterย 1200ย mmย long steel shaft if its maximum elongation exceeds 1 mm

A. 83

B. 125

C. 103

D. 93

Answer: **Option A**

Explanation:

299. Find the thickness of a metal needed in the semi-spherical end of aย cylinderย vesselย 0.70ย meterย inย diameterย subjectedย toย anย internal pressureย ofย 2.7ย N/mm^{2}.ย theย materialย isย mildย carbonย steelย and tensile stress is 69 N/mm^{2}.

A. 5.2 mm

B. 6.02

C. 7.53 mm

D. 6.84 mm

Answer: **Option D**

Explanation:

300. A 102 mm diameter shaft is driven at 3000 rpm by a 300 Hp prime mover.ย Theย shaftย drivesย aย 121.9ย cmย diameterย chainย sprocket havingย 85%ย outputย efficiency.ย Computeย theย torqueย inย in-lb developed in the shaft

A. 5,6000

B. 7,100

C. 8,150

D. 6,300

Answer: **Option D**

Explanation:

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