271. The bell crank levers used in railway signalling arrangement are of third type levers.
TRUE
FALSE
✅ The correct answer is option B.
Machine Design MCQs
272. A basic shaft is one whose
lower deviation is zero
upper deviation is zero
lower and upper deviations are zero
none of these
✅ The correct answer is option B.
273. The size of a cam depends upon
base circle
pitch circle
prime circle
pitch curve
✅ The correct answer is option A.
274. When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be __________ the bearing modulus.
5 times
10 times
15 times
20 times
✅ The correct answer is option C.
275. The lower deviation is the algebraic difference between the
minimum limit and the basic size
maximum limit and the basic size
actual size and the corresponding basic size
none of the above
✅ The correct answer is option A.
276. Two concentric helical springs used to provide greater spring force are wound is opposite direction.
TRUE
FALSE
✅ The correct answer is option A.
277. In case of pressure vessels having open ends, the fluid pressure induces
longitudinal stress
circumferential stress
shear stress
none of these
✅ The correct answer is option B.
278. The material commonly used for crane hooks is
cast iron
wrought iron
mild steel
aluminium
✅ The correct answer is option B.
279. When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.
rectangular
square
parallel
✅ The correct answer is option C.
280. In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called
normal pitch
axial pitch
diametral pitch
module
✅ The correct answer is option A.