mechanical engineering basic concepts ojective questions with answers part2

Q1. A flat surface can be produced by a lathe machine, if the cutting tool moves
(A) parallel to the axis of rotation of work piece
(B) perpendicular to the axis of rotation of work piece
(C) at an angle of 450
(D) None of these

Q2. What is the function of cone pulley drive in lathe machines?
(A) Drive the lead screw
(B) Change the spindle speed
(C) Drive the tail-stock
(D) All of these

Q3. Which of the following is a mechanism for mechanized movements of the carriage along longitudinal axis?
(A) Cross-slide
(B) Compound rest
(C) Apron
(D) Saddle

Q4. The function of taper turning process is to
(A) reduce the diameter of a work piece along its length
(B) reduce the diameter by removing material about an axis offset from the axis of work piece
(C) remove the material from end surface of a work piece
(D) All of these

Q5. The process of bevelling sharp ends of a workpiece is known as
(A) knurling
(B) grooving
(C) facing
(D) chamfering

Q6. In an isolated system, which one of the following can be transferred between the system and its surrounding.
(A) only energy
(B) only mass
(C) both energy and mass
(D) neither energy nor mass

Q7. Which of the following is an extensive property?
(A) Volume
(B) Pressure
(C) Viscosity
(D) All of these

Q8. Correct expression for absolute pressure?
(A) Gauge pressure + Atmospheric pressure
(B) Gauge pressure – Atmospheric pressure
(C) Gauge pressure / Atmospheric pressure
(D) None of these

Q9. The extensive properties of a system
(A) are independent of the mass of the system
(B) depend upon temperature of the system
(C) depend upon the mass of the system
(D) None of these

Q10. An isobaric process, has constant
(A) density
(B) pressure
(C) temperature
(D) volume

Q11. Which of the following energy conversion devices convert heat into work?
(A) Electrical generators
(B) IC engines
(C) Condensers
(D) All of these

Q12. Lancashire boilers are
(A) externally fired boilers
(B) internally fired boilers
(C) both of these
(D) None of these

Q13. Smoke tube boilers have large water to steam ratio, hence
(A) have high evaporation rates
(B) are slow in operations
(C) temperature stresses inducing failure of feed water arrangement are maximum
(D) All of these

Q14. In four stroke cycle engine, cycle is completed in
(A) two strokes of the piston
(B) two revolutions of the crankshaft
(C) three strokes of the piston
(D) four revolutions of the crankshaft

Q15. Which type of bearings are known as anti-friction bearings?
(A) Sliding contact bearings
(B) Rolling contact bearings
(C) Both of these
(D) None of these

Q16. In roller bearings which type of rolling elements are used?
(A) Cylindrical rollers
(B) Taper rollers
(C) Spherical rollers
(D) All of these

Q17. Why is the load carrying capacity low in ball bearings?
(A) Due to line contact between inner race and the ball
(B) Due to greater axial dimensions
(C) Due to less radial dimensions
(D) Due to point contact between inner race and the ball

Q18. Cylindrical roller bearings have greater
(A) axial load carrying capacity
(B) thrust load carrying capacity
(C) radial load carrying capacity
(D) All of these

Q19. Which of the following statements is/are true?
(A) Jaw clutch is a positive clutch
(B) The power transmitting capacity of a friction clutch is inversely proportional to the coefficient of friction between contacting surfaces
(C) Driving and driven plates in friction clutches are held together due to radial force applied by the helical springs
(D) All of these

Q20. Which of the following statements is/are true for gear drives?
(A) They can be used for long centre distances
(B) They are used to transmit power between non-intersecting and parallel shafts
(C) They cannot be used for high reduction ratios
(D) All of these