MCQ
261. Which of the following is true for the calibration of instruments?
In casting and fabrication shops the measurements made are of more precise nature as compared to those made in machine shop and tool room
Periodical calibration is made for optical measuring instruments
There is no need of periodic calibration in universal microscope
Preventive maintenance is not necessary former optical measuring instruments
262. Which of the following is used to check change in ocular lines position due to column rotation in universal micrometer?
Slip gauges
Control shaft
Universal microscope
Dial indicator
263. What is the maximum permissible error in wear of centres?
0.04 mm
0.03 mm
0.02 mm
0.01 mm
264. What is the use of ratchet stop in micrometer?
Prevent motion of spindle
Maintain uniform measuring pressure
Provide measuring surface
Forms measuring tip
265. Which of the following is not correct about protector blocks?
Protector blocks have letter B on its measuring face
They are provided with high grade sets of gauge blocks
These are made from Tungsten carbide
These are 2 mm blocks
266. What is the total error in micrometer?
Positive and negative deviation from the zero point
Error in parallelism
Deviation from measurement of a nominal dimension
Maximum difference between ordinates of cumulative error
267. 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?
4”
2”
3”
1”
268. What is the range of voltage fluctuations which can be taken care by an electronic unit in universal measuring instrument?
18% to 20%
-10% to +50%
-18% to +20%
10% to 50%
269. What is the permissible error in straight movement of longitudinal and transverse table in borizontal plane?
0.002mm
0.004mm
0.003mm
0.005mm
270. Which of the following is true for checking the relative perpendicular motion of the longitudinal and transverse carriage?
The permissible error allowed is 0.005 mm in 2500 mm length.
This is checked using a slip gauges
Precision square of class 1 or 0 is used
Maximum error in precision error is of 10" in squareness
271. What is the permissible error in the perpendicular motion of ocular microscope column w.r.t. The work stage over 100 mm movements?
0:04 mm
0.05 mm
0.07 mm
0.06 mm
272. What is the maximum permissible error for class 1 micrometers?
0.002 mm
0.004 mm
0.008 mm
0.016 mm
273. Which of the following option is correct about given statements about micrometer? Statement 1: The anvil should not protrude from the frame. Statement 2: An adjusting nut is present in micrometer to compensate wear.
Only stalement 1 is true
Only statement 2 is true
Both the statements are true
Both the statements are false
274. Which of the following is incorrect about micrometer?
Thimble and barrel should have a dull finish
Total travel of the measuring spindle is called measuring range
Graduated surface diameter of barrel should be 5mm
Screw has 10 or 20 threads per cm
275. The representative fraction 1/2500 means that the scale is-
1cm=0.25m
1cm=250m
2500= cm 25m
1cm=25m
276. Which of the following is incorrect?
V-Artvil micrometer caliper is used to check out of roundness
Blade type micrometer has a non-rotating spindle
Tube wall thickness can be measured by an ordinary micrometer
Self-centering inside micrometer has an interchangeable measuring head Vernier
277. What is the least count of a micrometer?
0.01µm
0.02µm
0.35µm
0.2µm
278. Why tolerances are given to the parts?
Because it's impossible to make perfect settings
To reduce weight of the component
To reduce cost of the assembly
To reduce amount of material used
279. What are the functional dimensions?
Have to be machined and fit with other mating components
Which have no effect on the performance of quality
Need not to be machined to an accuracy of the high degree
Function is more important than accuracy
280. Which one of the following is not a recommended set gauge of a metric unit?
M 112
M33
M105
M95