Quiz: Mechanical Engineering
Exam: DFCCIL
Topic: Metal Machining
Each question carries 2 mark
Negative marking: 1/3 mark
Time: 10 Minutes
Q1. The cutting fluid mostly used for machining steel is
(a) Water
(b) Soluble oil
(c) Air
(d) Heavy oils
Q2. In orthogonal cutting of material, the cutting edge is
(a) perpendicular to the workpiece
(b) perpendicular to the shear plane
(c) perpendicular to the axis of cutting tool
(d) perpendicular to the direction of tool travel
Q3. Inconel and Haste alloy require cutting tools that are
(a) tough
(b) wear resistant
(c) heat resistant
(d) shock-resistant
Q4. Angle between the face and flank of the single point cutting tool is known as
(a) Rake angle
(b) Clearance angle
(c) Lip angle
(d) Point angle
Q5. Which of the following relationship among shear angle ϕ, friction angle β, and cutting rake angle α is known as Lee and Shaffer analysis?
(a) 2 ϕ+ β- α=π/2
(b) ϕ+ β- α=π/2
(c) ϕ+ β- α=π/4
(d) ϕ+ β/2- α/2=π/4
Q6. Which is the property of a tool that prevents plastic deformation at its cutting edge during machining process?
(a) High value of fracture toughness
(b) High value of hardness under heating
(c) Chemical stability
(d) Adhesion resistance
Q7. Which of the following has poor shock resistant?
(a) carbides
(b) diamonds
(c) ceramics
(d) none of the mentioned
Q8. Carbide tools are used in_____
(a) rapid stock removal
(b) higher speeds
(c) rapid stock removal and higher speed both
(d) none of the mentioned
Q9. _ is the distance the tool advances for each revolution of the work.
(a) feed
(b) depth of cut
(c) metal removal rate
(d) none of the mentioned
Q10. Which of the following represents the formula for metal removal rate?
a=cutting speed, b=depth of cut, c=feed, d=revolution
(a) (abd)/c
(b) (ab)/(cd)
(c) (abc)/d
(d) none of the mentioned
Solutions
S1. Ans (b)
Sol. We generally use soluble oil for the machining of steel.
S2. Ans (d)
Sol. In orthogonal cutting, the direction of tool travel is perpendicular to the cutting edge and in oblique cutting, cutting edge is inclined by an angle with the direction of tool travel.
S3. Ans (c)
Sol. As high heat is produced during machining of Inconel and Haste alloy. So, tool material should be high heat resistant to avoid failure of tool tip due to thermal shock.
S4. Ans (c)
Sol. Angle between face and flank is known as Lip angle.
S5. Ans (c)
Sol. Lee and Shaffer analysis for machining states that
ϕ+ β- α=π/4
S6. Ans(b)
Sol. Hot hardness is the property of cutting tool that prevents plastic deformation at its cutting edge during machining process.
S7. Ans.(c)
Sol. Ceramic has poor shock resistant. Apart from this, it has high wear resistance and again has very high stock removal rate.
S8. Ans.(c)
Sol. Carbides are used for these both reasons. But they are not used for comparatively small jobs
S9. Ans.(a)
Sol. The feed of a cutting tool in a lathe work is the distance the tool advances for each revolution of the work. Increased feed reduces the cutting time.
S10. Ans.(c)
Sol. (abc)/d – This is the right formula for metal removal rate. Here a is expressed in mm/minute, b is expressed in mm, c is expressed in mm/revolution and d is simply revolution.
