mechanical engineering basic concepts ojective questions with answers part3

Q1. At forging temperature when a compressive force is applied on the material, it deforms
(A) elastically in the direction of least resistance
(B) elastically in the direction of maximum resistance
(C) plastically in the direction of least resistance
(D) plastically in the direction of maximum resistance

Q2. The process of joining similar or dissimilar materials by heating them below 450o C using non-ferrous filler material is called as
(A) Brazing
(B) Soldering
(C) Welding
(D) All of these

Q3. Casting replica used to make the cavity is called as
(A) Mould
(B) Pattern
(C) Cope
(D) None of these

Q4. What is meant by drag in casting process?
(A) Upper part of casting flask
(B) Molten metal
(C) Lower part of casting flask
(D) Upper and lower part of casting flask

Q5. What are the number of sliding and turning pairs in a slider crank mechanism?
(A) 1 sliding pair and 3 turning pairs
(B) 2 sliding pairs and 2 turning pairs
(C) 3 sliding pairs and 1 turning pair
(D) None of these

Q6. Which of the following is an inversion of four bar chain?
(A) Coupled wheels of locomotive
(B) Whitworth quick return mechanism
(C) Reciprocating air compressor
(D) Hand pump

Q7. What is the primary function of mechanism?
(A) Power transmission
(B) Power absorption
(C) Force transmission
(D) Motion transmission

Q8. Which body transmits force with negligible deformation?
(A) Elastic body
(B) Resistant body
(C) Deforming body
(D) All of these

Q9. Which of the following statements is/are true for mechanisms?
(A) A slider crank mechanism is formed, if one link in slider crank chain is fixed
(B) Three kinematic links joined together forms a mechanism
(C) Kinematic chain is a part of kinematic pair
(D) All of these

Q10. Which of the following is a characteristic of Polytetra-flouro-ethylene?
(A) High coefficient of friction
(B) Tough at high temperature
(C) Resistance to chemical attack
(D) All of these

Q11. The plastic materials which do not undergo chemical change when heated are
(A) Thermoplasts
(B) Thermosets
(C) Both of these
(D) None of these

Q12. Copper when alloyed with zinc is known as
(A) Brass
(B) Bronze
(C) Babbits
(D) All of these

Q13. Which of the following is a ferrous alloy?
(A) Brass
(B) Aluminum alloys
(C) Cast steel
(D) All of these

Q14. Which of the following statements is/are true for alloy steels?
(A) They contain carbon more than 1.7%
(B) They are ductile
(C) They have low resilience and toughness
(D) All of these

Q15. Which of the following component(s) is/are manufactured by powder metallurgy processes?
(A) Gears
(B) Cutting tools
(C) Bearing bushes
(D) All of these

Q16. In which of the following processes, material is neither added nor removed but is deformed into desired shape?
(A) Surface finishing process
(B) Metal forming process
(C) Casting
(D) Machining

Q17. Which of the following factors reduce strength of casted components?
(A) Blow holes
(B) Gas cavities
(C) Non-metallic incursions
(D) All of these

Q18. Which of the following is a not a surface finishing process?
(A) Honing
(B) Buffing
(C) Lapping
(D) Turning

Q19. Which of the following inversions of four bar chain, convert oscillatory motion from one lever to another lever?
(A) Ackermann steering gear mechanism
(B) Beam engine mechanism
(C) Coupled wheels of locomotive
(D) All of these

Q20. Beam engine mechanism is an example of
(A) double crank mechanism
(B) double lever mechanism
(C) crank and lever mechanism
(D) None of these