1. The description of tolerances consists of two parts namely?
a) Fundamental deviation and magnitude of tolerance
b) Magnitude of deviation and magnitude of tolerance
c) Mean deviation and magnitude of tolerance
d) Fundamental deviation and tolerance
Explanation: Fundamental deviation and magnitude of tolerance are decrypted in the tolerance.
2. Which of the following are true for fundamental deviation?
a) Gives location of tolerance zone
b) Capital letter is used for both holes and shafts
c) Small letter is used for both holes and shaft
d) None of the mentioned
Explanation: Tolerance zone is depicted by deviation while magnitude is depicted by grade
3. How many grades of tolerances are there according to BIS system fits and tolerances?
a) 12
b) 14
c) 16
d) 18
Explanation: As per the standard
4. The temperature at which new stress free grains are formed in the metal is called the ______ temperature.
a) Recrystallization
b) Crystallization
c) Solidification
d) None of the mentioned
Explanation: Definition of recrystallization temperature.
5. Hot working or cold working, which reduces strain hardening and residual stresses?
a) Hot working
b) Cold working
c) Both have equal effect
d) Impossible to detect
Explanation: In hot working grains are re arranges as per requirement and no residual stresses.
6. Hot rolled components have better toughness and ductility
a) true
b) false
Explanation: Hot working refines grain structure an hence improves ductility and toughness.
7. Hot rolled components have better surface finish than cold rolled components.
a) True
b) false
Explanation: Cold working gives better surface finish
8. A mechanical component may fail as a result of which of the following
a) elastic deflection
b) general yielding
c) fracture
d) each of the mentioned
Explanation: Failing simply means unable to perform its function satisfactorily.
9. Type of load affects factor of safety.
a) True
b) false
Explanation: Dynamic load has higher factor of safety as compared to static loading.
10. For cast iron components, which of the following strength are considered to be the failure criterion?
a) Ultimate tensile strength
b) Yield Strength
c) Endurance limit
d) None of the mentioned
Explanation: Ultimate tensile strength is the highest stress a component can undergo before failingand hence is used as a criterion.