Quiz: Mechanical Engineering
Exam: UPRVUNL
Topic: Miscellaneous
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes
Q1. A cylinder is filled with a compressed liquid which has a volume of 0.02 m^3 at 40 Kg/〖cm〗^2 and a volume of 0.019〖 m〗^3 at 140 Kg/〖cm〗^2. The bulk modulus of liquid is
(a) 200 Kg/〖cm〗^2
(b) 2000 Kg/〖cm〗^2
(c) 20 ×〖10〗^5 Kg/〖cm〗^2
(d) 20 ×〖10〗^6Kg/〖cm〗^2
Q2. Hardness of martensite is about
(a) RC 65
(b) RC 48
(c) RC 57
(d) RC 80
Q3. The stress developed in case of bar which is not restricted between any support
(a) Thermal stress
(b) Tensile stress
(c) No stress
(d) Bending
Q4. The effective diameter of an external and internal screw thread is known as
(a) Minor diameter
(b) Major diameter
(c) Pitch diameter
(d) None of these
Q5. The softest bond is
(a) Silicate bond
(b) Shellac bond
(c) Vitrified bond
(d) All of equal strength
Q6. The composition of German silver is
(a) 12.5% silver
(b) 5% silver
(c) 1% silver
(d) None of the above
Solution
S1. Ans. (b)
Sol. Bulk modulus by definitions
K=dp/((-dV)/V)
K=((140-40))/(-((0.019-0.02))/0.02)
K=2000 Kg/〖cm〗^2
S2. Ans. (a)
Sol.
S3. Ans. (c)
Sol. it is given that material is expands freely means that there is no restrictions in the path of expansion of material so there will be no possibility of stress generation.
S4. Ans. (c)
Sol. The effective diameter of an external and internal screw thread is known as pitch diameter.
S5. Ans. (a)
Sol.
S6. 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.
