Biju Patnaik University of Technology 2008 B.Tech Mechanical Engineering MQCR - Question Paper

Metrology,Quality Control And Reliability




1.Answer the subsequent briefly : [ marks2*10]

(A) Differentiate ranging from Tolerance & Allowance.

(B)Differentiate ranging from Hole Basis system and shaft basis system of fits

(C)define roughness in connection with surface texture assessment.

(D)define symbol Ra 8.0(2.5) means ---------

(E)define the term airy point.

(F)define sequential sampling plan

(G)what do you mean byAOQL

(H)Differentiate ranging from accuracy and precision.

(I)what do you mean by maintainability

(J)explain Bath-tube- curve

2. (A) explain taguchi's loss function. [MARKS 3]

(B)customer tolerance for the height of a steering mechanism are 1.5+-0.020m.for a product that just exceeds these limits,the cost to the customer for getting it fixed is Rs2000/- .ten products are randomly
opted and yeild the subsequent height in meter :1.53,1.49,1.50,1.49,1.48,1.52,1.54,1.53,1.51and1.52 . obtain the avg. loss per production item. [MARKS 7}


3 . (A)explain procedures that might improve the reliabilty of a system. [MARKS 4]

(B)discuss the signal to noise ratio . how is it used in the taguchi method ?what is an adjustment parameter and how it is used? [MARKS 6]

4. (A) what is the procedure of a sequential sampling. [MARKS 5]

(B)lots of 3000 crank shafts are submitted for inspection by ultra sonic testing for internal flaws. prepare a sequential sampling using the subsequent data :
AQL =0.10
LTPD =0.30 [MARKS 5]
procedure's risk (Rp) =0.05
consumer's risk (Rc) =0.10


5. (A)In a hole and shaft combination of 25 mm nominal size
H7 hole limits are +0.021 mm
-0.000 mm
e8 shaft limits are -0.040mm
- 0.073mm
state the value of :
a)Maximum and Minimum Clearance Obtainable
b)allowance
c) tolerance on hole and shaft [MARKS 6]
d)type of fit

(B)describe interchangeble assembly with suitable example .state it s advantages. [MARKS 4]

6. (A) discuss why a go gauge should be full form and a no gauge should check any 1 dimension of element or feature of the work. [MARKS 5]

(B)name the important elements of thread which are needed to be measured in order to determine the accuracy of screw threads. define in brief how the errors in these elements affect the working of the threaded elements. [MARKS 5]

7. (A) describe the term METROLOGY as applied to engineering industry. state its significance in modern industry. [MARKS 4]

(B)a calibrated meter and bar has an true length of 1000.0005mm . it is to be used in the calibration of 2 bars ,A and B,each having a basic length of 500 mm.
when compared with the meter bar La+Lb was obtained to be shorter by 0.0003 mm.in comparing A with B . obtain the true length of A and B. [MARKS 6]

8. (A) what is meant by probability distribution ? discuss whera binomial distribution can be applied in practice. [MARKS 10]

Earning:   Approval pending.