251-300

Question 1

251. Ackerman steering gear is made up of

a) rolling and sliding pairs
b) rolling pairs
c) sliding and rotary pairs
d) turning pairs

Answer 1

d) turning pairs

Question 2

252. A cam where the follower reciprocates or oscillates in a plane parallel to the axis of the cam is called:

a) circular cam
b) cylindrical cam
c) reciprocating cam
d) tangential cam

Answer 2

b) cylindrical cam

Question 3

253. Instantaneous center of rotation of a link in a four-bar mechanism lies on

a) a point obtained by intersection of extending adjoining links
b) left side pivot of this link
c) right side pivot of this link
d) any of the choices above

Answer 3

a) a point obtained by intersection of extending adjoining links

Question 4

254. A vector quantity that describes both how fast it is moving and the direction in which it is heated.

a) Acceleration
b) Displacement
c) Motion
d) Velocity

Answer 4

d) Velocity

Question 5

255. Which of the following is the rate at which the velocity is changing?

a) Acceleration
b) Linear
c) Motion
d) Vertical

Answer 5

a) Acceleration

Question 6

256. The direction of the __________ is toward the center of the circle in which, the study moves.

a) Centripetal acc.
b) Centrifugal acc.
c) Radial cam
d) Tangential

Answer 6

a) Centripetal acc.

Question 7

257. It is a device that changes the magnitude, direction or mode of application of a torque or force while transmitting it for a particular purpose.

a) Frame
b) Machine
c) Mechanism
d) Structure

Answer 7

b) Machine

Question 8

258. The process of obtaining the resultant of any number of vectors.

a) Scalar quantity
b) Vector composition
c) Vector quantity
d) Vector resolution

Answer 8

b) Vector composition

Question 9

259. It has magnitude, direction and sense.

a) scalar quantity
b) absolute quantity
c) vector quantity
d) relative velocity

Answer 9

c) vector quantity

Question 10

260. A plate, cylinder or other solid with a surface of contact so designed as to caused or modify the motion of the piece.

a) Cam
b) Disc
c) Gear
d) Pulley

Answer 10

a) Cam

Question 11

261. When acceleration is zero, the

a) velocity is constant
b) velocity is negative
c) velocity is variable
d) velocity is zero

Answer 11

a) velocity is constant

Question 12

262. When the velocity is changing, the acceleration is

a) constant
b) not constant
c) variable
d) zero

Answer 12

a) constant

Question 13

263. Klein’s construction is used to determine the

a) acceleration of various parts
b) angular acceleration of various parts
c) displacement of various parts
d) velocity of various parts

Answer 13

a) acceleration of various parts

Question 14

264. Klein’s construction can be used when

a) crank has a uniform angular acceleration
b) crank has a uniform angular velocity
c) crank has a non-uniform angular velocity
d) b and c above

Answer 14

d) b and c above

Question 15

265. The cam angle is

a) the angle subtended by live portion of cam at the cam’s center
b) the angle of rotation of the cam for a definite displacement of the follower
c) the angle subtended at the cam’s center by the portion of cam during which the follower moves
d) the angle subtended by the cam at the cam center when the follower dwells

Answer 15

b) the angle of rotation of the cam for a definite displacement of the follower

Question 16

266. The pitch point on a cam refers to

a) any point on pitch curve
b) a point at a distance equal to pitch circle radius from the center
c) the point of cam pitch circle that has the maximum pressure angle
d) none of the above

Answer 16

c) the point of cam pitch circle that has the maximum pressure angle

Question 17

267. For a kinematics chain to be considered as mechanism,

a) none of the links should be fixed
b) one link should be fixed
c) there is no such criterion
d) two links should be fixed

Answer 17

b) one link should be fixed

Question 18

268. Hart mechanism has how many links?

a) 4
b) 6
c) 8
d) 12

Answer 18

b) 6

Question 19

269. Peaucellier mechanism has how many links?

a) 4
b) 5
c) 6
d) 8

Answer 19

d) 8

Question 20

270. A came with a roller follower would constitute which type of pair?

a) close pair
b) higher pair
c) lower pair
d) open pair

Answer 20

b) higher pair

Question 21

271. Kinematics pairs are those pairs that have

a) elements of pairs not held together mechanically
b) point or line contact between the elements when in motion
c) surface contact between the two elements when in motion
d) two elements that allow relative motion

Answer 21

d) two elements that allow relative motion

Question 22

272. A Pantograph is a mechanism having

a) higher pairs
b) lower pairs
c) rolling pairs
d) spherical pairs

Answer 22

b) lower pairs

Question 23

273. The number of links in a pantograph is equal to

a) 3
b) 4
c) 5
d) 6

Answer 23

b) 4

Question 24

274. In elliptical trammels,

a) all four pairs are turning
b) one pair turning and three pairs sliding
c) three pairs turning and one pair sliding
d) two pairs and two pairs sliding

Answer 24

d) two pairs and two pairs sliding

Question 25

275. The Klein's method of construction for reciprocating engine mechanism a) enables determined of Coriolis component b) is a simplified form of instantaneous center method c) is based on acceleration diagram d) utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

Answer 25

d) utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine

Question 26

276. If a particle of a link has a velocity that changes both in magnitude and direction at any instant, then a) it must have only unidirectional acceleration b) it must have two components of acceleration e.g., centripetal and tangential c) it must have three components of acceleration e.g., centripetal, centrifugal and tangential d) it must have three components of acceleration e.g., centripetal, centrifugal and gravitational

Answer 26

b) it must have two components of acceleration e.g., centripetal and tangential

Question 27

277. Select the one that is the highest pair. a) Crosby indicator mechanism b) Hart's straight-line mechanism c) Thomson indicator mechanism d) Both gearing mechanism

Answer 27

d) Both gearing mechanism

Question 28

278. A shaft revolving in a bearing forms a a) Cylindrical pair b) higher pair c) lower pair d) sliding pair

Answer 28

c) lower pair

Question 29

279. The total number of instantaneous centers for a mechanism of N links is equal to a) 2N b) (N-1) (N+1) c) 2N(N-1) d) N(N-1)/2

Answer 29

d) N(N-1)/2

Question 30

280. A kinematics chain needs a minimum of a) 2 links and 2 turning pairs b) 3 links and 3 turning pairs c) 3 links and 2 turning pairs d) 4 links and 4 turning pairs

Answer 30

d) 4 links and 4 turning pairs

Question 31

281. For kinematics chains formed by lower pair the relation between the number of joint J is given by a) L=2/3(J+2) b) L = 3/2(J+2) c) L = 2/3(L+2) d) L = 3/2(L+2)

Answer 31

a) L=2/3(J+2)

Question 32

282. In case of an elliptical trammel, a) one pair turns and two pairs slide b) two pairs and two pairs slide c) three pairs turn and one pair slide d) all four pairs turn

Answer 32

b) two pairs and two pairs slide

Question 33

283. Coriolis component of acceleration is found in a) four bar mechanisms b) mechanism of steam engine c) higher pair d) Whitworth-quick-return mechanism

Answer 33

d) Whitworth-quick-return mechanism

Question 34

284. It is one that is not appreciably deformed by the action of any external force or load. a) rigid body b) structure c) Frame d) Mechanism

Answer 34

a) rigid body

Question 35

285. The maximum stress to which a standardized test specimen may be subjected without permanent deformation. A. Endurance limit B. Proportional limit C. Elastic limit D. Plastic limit

Answer 35

C. Elastic limit

Question 36

286. The modulus of elasticity is a measure of A. Stiffness B. Toughness C. Resilience D. Hardness

Answer 36

A. Stiffness

Question 37

287. Aging at moderately elevated temperature expedites the process and A. Natural aging B. Artificial aging C. Normal aging D. Supernatural aging

Answer 37

B. Artificial aging

Question 38

288. It is the tendency to fracture without appreciable deformation A. Ductility B. Brittleness C. Malleability D. Plasticity

Answer 38

B. Brittleness

Question 39

289. It is the characteristic of exhibiting different properties when tested in different directions A. Allotropy B. Anisotropy C. Isentropic D. Isotropic

Answer 39

B. Anisotropy

Question 40

290. It is one in which specimen, supported at both ends as a simple beam is broken by the impact strength of the metal A. Charpy test B. Izod test C. Rockwell test D. Universal test

Answer 40

A. Charpy test

Question 41

291. Steel that has been deoxidized with strong deoxidizing agent such as silicon or aluminum, in order to eliminate the reaction between the carbon and oxygen during solidification A. Carbon steel B. Tool steel C. Killed steel D. Structural steel

Answer 41

C. Killed steel

Question 42

292. Involves the loss of ductility because of a physical or chemical change of the material is known as A. Embrittlement B. Pitting C. Cold shortness D. Decarburization

Answer 42

A. Embrittlement

Question 43

293. A material commonly used for shielding or screening magnetism A. Brass B. Copper C. Aluminum D. Soft iron

Answer 43

D. Soft iron

Question 44

294. A magnet is able to attract A. Iron, aluminum and brass B. Iron, cobalt and zinc C. Iron, copper and nickel D. Nickel, cobalt and steel

Answer 44

D. Nickel, cobalt and steel

Question 45

295. Which of the following materials is used for making permanent magnets? A. Carbon steel B. Platinum cobalt C. Alnico D. All three mentioned

Answer 45

D. All three mentioned

Question 46

296. Which of the following is the best conductor of electricity? A. Graphite B. China clay C. Porcelain D. Ceramics

Answer 46

A. Graphite

Question 47

297. Dielectric strength of a material depends on the material's A. Moisture content B. Thickness C. Temperature D. All of these

Answer 47

D. All of these

Question 48

298. Which medium has highest value of dielectric strength? A. Glass B. Mica C. Porcelain D. Quartz

Answer 48

B. Mica

Question 49

299. Which of the following is a primary cell? A. Mercury – oxide B. Lead – acid C. Nickel-iron – alkaline D. Nickel – cadmium – alkaline

Answer 49

A. Mercury – oxide

Question 50

300. Which of the following contact point metals has highest melting point? A. Silver B. Tungsten C. Gold D. Copper

Answer 50

C. Gold