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# UPRVUNL’21 ME: Daily Practices Quiz. 31-Aug-2021

Quiz: Mechanical Engineering
Exam: UPRVUNL
Topic: Miscellaneous

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

Q1. Generally, bushes are provided in
(a) A jig to locate the job
(b) A jig to guide the tool
(c) A jig to hold the job
(d) A jig to locate the tool

Q2. In an interference fit between a shaft and a hub, the state of stress in the shaft due to interference fit is
(b) a tensile radial stress and a compressive tangential stress
(c) A tensile tangential stress and a compressive radial stress
(d) A compressive tangential stress and a compressive radial stress

Q3. A quaternary joint is equivalent to……. In case of kinematic chain, is
(a) One binary joint
(b) Two binary joints
(c) Three binary joints
(d) Four binary joints

Q4. Mathematically, strain is the ratio of deformation per unit __________
(a) Length
(b) Volume
(d) Area

Q5. What is the pressure difference between inside and outside of a droplet of water?
(a) 2σ/d
(b) 4σ/d
(c) 8σ/d
(d) 12σ/d

Q6. The shearing area of a key of length ‘l’, breadth ‘b’ and depth ‘d’ is equal to
(a) l×d
(b) b×d
(c) l × b
(d) l×d/2

Solutions
S1. Ans.(b)
Sol. Bushes are generally provided in a jig to guide the tool.
S2. Ans.(a)
Sol. In an interference fit between a shaft and a hub, the state of stress in the shaft due to interference fit is only compressive radial stress.

S3. Ans.(c)
Sol.
One tertiary pair = 2 binary pair
One quaternary pair = 3 binary pair

S4. Ans.(a)
Sol. Mathematically, strain is defined as deformation per unit length or we can say that it is the ratio of change in length to original length represent by ϵ.
▭(ϵ=∆l/l)
S5. Ans (b)
Sol. Pressure difference between inside and outside of a droplet of water = 4σ/d
∵ Bursting force = p×πd²/4
Resisting force = σ ×π d
Bursting force= Resisting force
p×πd²/4=σ×πd
or p=4σ/d
S6. Ans. (c)
Sol. Shearing area of key = Length (l) × Breadth (b) = l × b

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