Indian Engineering Services IES Conducted By UPSC Year 2008 Paper II Objective Mech Engineering .This is part 1 of 4 For Other parts Check Links given at Bottom of This paper
1 Which mechanism produces intermittent rotary motion from continuous rotary motion ?
(a) Whitworth mechanism (b) Scotch Yoke mechanism
(c) Geneva mechanism (d) Elliptical trammel
2 A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load speed are doubled, how does the minimum film thickness vary ?
(a) Remains unchanged
(b) Gets doubled
(c) Gets reduced to one-fourth of original value
(d) Gets reduced to half of original value
3 Interference between an involute gear and a pinion can be reduced by which of the following ?
1. Increasing the pressure angle of the teeth in the pair, the number of teeth remaining the same.
2. Decreasing the addendum of the gear teeth and increasing the same for the pinion teeth by the corresponding amount.
Select the correct answer using the code given below :
(a) l only (b) 2 only
(c) Both l and 2 (d) Neither 1 nor 2
4 Which one of the following is correct ?
When two teeth profiles of gears are conjugate, the sliding velocity between them
(a) is always zero all through the path of contact
(b) is zero, at certain points along the path of contact
(c) is never zero anywhere on the path of contact
(d) can be made zero by proper selection of profiles
5. For a speed ratio of 100 smallest gear box is obtained by using which of the following ?
(a) A pair of spur gears
(b) A pair of bevel and a pair of spur gears in compound gear train
(c) A pair of helical and a pair of spur gears in compound gear train
(d) A pair of helical and a pair of worm gears in compound gear train
6. Among the following four designs of a flywheel with given mass M(kg) and external
diameter D(m), which is the one with the highest energy storage capacity ?
(a) Plain circular disc of uniform thickness
(b) Double conical disc thicker at the centre and thinner at the periphery
(c) Double conical disc thinner at the centre and thicker at the periphery
(d) Circular ring with spokes
7 Which one of the following mechanisms represents an inversion of the single slider-crank chain ?
(a) Elliptical trammel {b) Oldham's coupling
(c) Whitworth quick return mechanism (d) Pantograph mechanism
8 Which one of the following is correct ?
A hydrodynamic slider bearing develops load-bearing capacity mainly because of
(a) slider velocity (b) wedge shaped oil film
(c) oil compressibility (d) oil viscosity
9 Which one of the following is correct ?
When a nut is tightened by placing a washer below it, the bolt will be subjected to
(a) compression only (b) tension
(c) shear only (d) compression and shear
10. Which material is used for bushes in the bushed-pin type of flexible coupling ?
(a) Gun metal {b) Plastic
(c) Rubber (d) Aluminium
11. The balls of the ball bearings are manufactured from steel rods. The operations involved are:
1. Ground
2. Hot forged on hammers
3. Heat treated
4. Polished
What is the correct sequence of the above operations from start ?
(a) 3-2-4-1 (b) 3-2-1-4
(c) 2-3-1-4 (d) 2-3-4-1
12. In automobiles, Hook's joint is used between which of the following ?
(a) Clutch and gear box (b) Gear box and differential
(c) Differential and wheels (d) Flywheel and clutch
13. In a flat belt drive the belt can be subjected to a maximum tension T and centrifugal
tension T . What is the condition for transmission of maximum power ?
(a) T = Tc (b) T = V3Tc
(c) T = 2T (d) T = 3T
14 A100 mm x 5 mm x 5 mm steel bar free toexpand is heated from 15 °C to 40°C. What shall be developed ?
(a) Tensile stress (b) Compressive stress
(c) Shear stress (d) No stress
15 What is the shape of the shearing stress distribution across a rectangular cross-section beam?
(a) Triangular
(b) Parabolic only
(c) Rectangular only
(d) A combination of rectangular and parabolic shape
16 Where does the maximum hoop stress in a thick cylinder under external pressure occur ?
(a) At the outer surf ace (b) At the inner surf ace
(c) At the mid-thickness (d) At the 2/3cd outer radius
17 Who postulated the maximum distortion energy theory ?
(a) Tresca {b) Rankine
(c) St. Venant(d) Mises-Henky
18 Which one of the following is correct ?
When "devitrification" of inorganic glasses is done,
(a) glass transforms from crystalline to non-crystalline state
(b) glass transforms into a fully transparent material
(e) glass, transforms from non-crystalline state to poly-crystalline state ; (d) glass is relieved of internal stresses
19 What is a surface imperfection, which separates crystals of different orientations in a
poly-crystalline aggregate, called ?
(a) Edge dislocation (b) Stacking fault
(c) Grain boundary (d) Screw dislocation
20 Which one of the following is correct ?
Malleability is the property by which a metal or alloy can be plastically deformed by applying
(a) tensile stress (b) bending stress
(c) shear stress (d) compressive stress
21. Which of the following elements given below determine (s) the maimum attainable hard
ness in steel?
1. Chromium
2. Manganese
3. Carbon
4. Molybdenum
Select the correct answer using the code given below :
(a) l only (b) 1 and 2
(c) 3 only (d) 2 and 4
22. Coefficient of Expansion is practically nil in a particular alloy. What is this alloy ?
(a) Hadfield Manganese Steel {b) Invar
(c) Vitallium (d) Stellite
23. Consider the following statements relating to mechanical properties of ceramics :
1. Tensile strength is theoretically high but in practice quite low.
2. Compressive strength is many times lower than tensile strength.
3. Shear strength is high.
4. Transverse strength is easy to ascertain. Which of the statements given above are correct ?
(a) land 3 (b) land 4
(c) 2 and 3 (d) 2 and 4
24. What is the process by which two or more chemically different monomers are polymerised to
form a cross link polymer together with a by-product such as water or ammonia, known as ?
(a) Addition polymerisation (b) Co-polymerisation
(c) Linear polymerisation (d) Condensation polymerisation
25. Which one of the following is correct ?
Babbitts are used for
(a) gears (b) bearings
(c) bolts (d) clutch liners
26 Cold forging results in improved quality due to which of the following ?
1. Better mechanical properties of the process.
2. Unbroken grain flow.
3. Smoother finishes.
4. High pressure.
Select the correct answer using the code given below :
(a) 1,2 and 3 (b) 1,2 and 4
(c) 2, 3 and 4 (rf) 1,3 and 4
27 . Consider the following statements :
In an orthogonal cutting the cutting ratio is found to be 0.75. The cutting speed is 60 m/min
and depth of cut 2.4 mm.
Which of the following are correct ?
1. Chip velocity will be 45 m/min.
2. Chip velocity will be 80 m/min.
3. Chip thickness will be 1.8 mm.
4. Chip thickness will be 3.2 mm.
Select the correct answer using the code given below :
(a) land3 (b) land4
(c) 2 and 3 (d) 2 and 4
28 What are the reasons for reduction of tool life in a machining operation ?
1. Temperature rise of cutting edge
2. Chipping of tool edge due to mechanical impact
3. Gradual wear at tool point
4. Increase in feed of cut at constant cutting force Select the correct answer using the code given below :
(a) 1,2 and 3 (b) 2,3 and 4
(c) 1,3 and 4 (d) 1,2 and 4
29 What term is used to designate the direction of the predominant surface pattern produced
by machining operation ?
(a) Roughness (b) Lay
(c) Waviness (d) Cutoff
30. Which one of the following statements is not correct ?
(a) Schedule chart shows the processing of a job on various work centres against time
(b) Load chart shows the processing of various jobs on a work centre against time
(c) Dispatching is the activity related with dispatching of goods to the customers
(d) Routing is the activity related with the operations and their sequence to be performed on the job
This is part 1 of 4 parts of Question Paper
Link to part 2
Link to Part 3
Link to Part 4
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