Quiz: Mechanical Engineering
Exam: NHPC JE
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes
Q1. The composition of German silver is
(a) 12.5% silver
(b) 5% silver
(c) 1% silver
(d) None of the above
Q2. The velocity along the shear plane is known as
(a) Shear velocity
(b) Chip velocity
(c) Cutting velocity
(d) Mean velocity
Q3. A football is rolling on ground, the motion of any point on its surface is
(a) elliptical plane motion
(d) plane rotation
Q4. Klein’s diagram is used to find
(a) Angular velocity of various parts
(b) Velocity of various parts
(c) Acceleration of various parts
(d) Velocity and acceleration of various parts
Q5. In spot welding, the electrode used is
(a) Made of Al
(b) Made of Cu
(c) Made of any material
(d) Made of Tungsten carbide
Q6. A non-consumable tungsten electrode is used in TIG to generate the arc, but the material which is used to increase the thermal resistance non-consumable tungsten is
(d) No such material is required
S1. Ans. (d)
Sol. There is no contamination of silver in German silver we can call it German silver just because it is appearing as silver.
German silver contains 60% cu, 20% Ni, and 20% Zn.
S2. Ans. (a)
Sol. The velocity along the tool face = chip velocity
The velocity along the shear plane = shear velocity
The velocity in the direction of cutting = cutting velocity.
S3. Ans. (c)
S4. Ans. (d)
Sol. Klein’s diagram is used to find velocity and acceleration of various parts of single slider crank mechanism.
S5. Ans. (b)
Sol. In spot welding, the electrode used is made of Cu. In this welding process indentation is produced by applying pressure and a high current in the range of 10000 Amp. is used.
S6. Ans. (c)
Sol. A non-consumable tungsten electrode is used in TIG to generate the arc, but the material which is used to increase the thermal resistance non-consumable tungsten is thorium and beryllium.