Quiz: Mechanical Engineering
Exam: UPPSC AE/Lecturer
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?
Q5. Find the expected time of an activity with pessimistic time = 12 days. Most time = 10 days. Optimistic time = 2 days.
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
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
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.