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# UPPSC Lec’21 ME: Daily Practices Quiz. 01-Nov-2021

Quiz: Mechanical Engineering
Exam: UPPSC AE/Lecturer
Topic: Industrial

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. The relation between error estimate (e) and sample size (n) in work sampling is
(a) e α 1/n
(b) e α 1/√n
(c) e α √n
(d) e α n

Q2. The data used by an X ̅ chart is
(a) Count Data
(b) Attribute measurement data
(c) Variable measurement data
(d) None of the above

Q3. In the model M/M/I : ∞/FCFS with utilization factor ρ, the expected line length is equal to
(a) 1 – ρ
(b) 1/(1- ρ)
(c) ρ/(1- ρ)
(d) ρ^2/(1- ρ)

Q4. Which of the following is not a symbol representing LAY i.e., the direction of tool marks or scratches or grains of surface?
(a) T
(b) C
(c) M
(d) R

Q5. Find the expected time of an activity with pessimistic time = 12 days. Most time = 10 days. Optimistic time = 2 days.
(a) 6
(b) 7
(c) 8
(d) 9

Q6. Which of the following is true about CPM?
(a) It is activity oriented
(b) It is a planning device
(c) It is used when activity times are deterministic
(d) All of the above

Solutions

S1. Ans. (b)
Sol. As we know that n=(z^2 ρ(1-ρ))/e^2
e α 1/√n
Where, n be the sample size or number of observation
Z be the level of confidence and its value for 95% confidence is 1.96 and for 99% confidence it is 2.33
e be the error estimate
ρ be the proportion of activity

S2. Ans. (c)
Sol. The data used by an X ̅ chart is variable measurement data.
X ̅ chart – It shows the centering of the process and shows the variation in the averages of individual samples.

S3. Ans. (c)
Sol. Expected line length is ρ/(1- ρ)

S4. Ans. (a)
Sol. T is not a symbol representing LAY i.e., the direction of tool marks or scratches or grains of surface.

S5. Ans. (d)
Sol. Given that
t_p=12,t_m=10,t_o=2
t_e=(t_p+〖4t〗_m+t_o)/6=(12+40+2)/6=9
S6. Ans. (d)
Sol. CPM is activity oriented; it is planning device and it is used when activity times are deterministic. So, all the given options are correct.

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