Code: A-32
Subject: RELIBILITY & QUALITY CONTROL
Time: 3 Hours
Max. Marks: 100
NOTE: There are 11 Questions in all.  
  • Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
  • Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.
  • Any required data not explicitly given, may be suitably assumed and stated.
Q.1
 Choose the correct or best alternative in the following:
 
a.
If denotes the failure rate, the mean time to failure for the exponential distribution is equal to
(A)  .          (B) .
(C) .             (D) .
 
b.
The Weibull distribution is used to model the time to failure of products in the following phase (s) of the life cycle:
(A) debugging phase only.          (B) wear out phase only.
(C) chance failure phase only.     (D) both debugging and wear out phases.
 
c.
 If m = mean time between failure, then the reliability at time t assuming exponential failure model is equal to
(A) .                   (B) .
(C) .                 (D) .

 
d.
 The reliability of two identical components is 0.9 each. The components are
connected in parallel and operate independently. The reliability of the system
is equal to
(A) 0.45            (B) 0.81
(C) 0.9              (D) 0.99
 
e.
 A process is said to be out of control if the number of points falling outside control limits is at least
(A) 1.                 (B) 2.
(C) 3.                 (D) 4.
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