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Question with Answer of DRDO 2008 - 2009 Exam :
1. Spur Gear are used for ____
transmitting power between two parallel shaft .
2. In the case of a curved beam subjected to pure bending, which of the following is true ?
Neutral axis coincides with the centroidal axis .
3. Which of the following bearings are terned as anti friction bearing ?
Ball and Rollar Bearing
Frictional Bearing
1. Angular Bearing
2. Rolling Element Bearing
3. Deep Groove Ball Bearing
4. Which of the following is a flexible coupling ?
Oldham Coupling .
 |
Oldham Coupling |
5. Endurance limit of a component ____
decreases as the surface roughness increses .
6. A discountinuity or jump in the shear force diagram occours whenever a beam is loaded by _____
a concentrated force .
7. When a solid circular shaft is in pure torsion and deforms elastically , the shearing stress in the shaft _____
Varies linearly with the radial distance from the axis of the shaft .
8. The linear relation between the stress and strain of a material is valid until____
Proportional Limit .
9. Which of the following can be the measure of ductility of a material ?
Percent reduction in area in tension test
10. At the point of contraflexture of a beam __
Sign of curvature in the deflection curve charges .
11. A material has s Poisson's ratio of 0.5 . If a body is made of this material and subjected to external forces (within the elastic limit ) then the final volume of body is _____
equal to the initial volume of the body .
12. Hinge support is not capable of resisting ____
moment .
13. For any process , the second law of thermodynamics requires that the entropy change of the system be ____
Positive or zero
14. For water boiling at constant pressure of 1 bar , the specific heat is ____
Zero
15. An inventor claims to have constructed a device that rejects 300KJ of heat to a single reservoir while absorbing 300KJ of water during a single cycle of the device . This device violets ____
Only the first law of thermodynamics and no other laws .
16. A man sites on the floor by a fire burning at some distance at the same level . The mode of the heat transfer mainly responsible for the man receiving heat is ____
Radiation .
17. A spherical body with surface A1 is completely enclosed by another hollow body with inner surface A2 . The shape factor of A2 with respect to A1 is _____
0.5
18. As thickness of insulation arround a heated cubic gradually increased from zero , heat transfer from the conductor _____
First increases and then decreases .
19. Arrangement of silver , air , aluminium and lead in the order of increasing thermal conductivity at room temperature yields .
Air , Lead , Aluminium , Silver
20. For a 2D rotational flow the Laplacian of the stream - function at any point in the flow field .
Equals Vorticity .
21. In passing through a standing normal shock - wave , a subsonic flow can not turn supersonic as it will not satisfy the ____
Second law of thermodynamics .
22. In the fully developed laminar flow through a horizontal pipe of constant cross section______
Static pressure decreases in the direction of flow .
23. For a cylindrical wooden block completely submerged under water , the only correct statement among the following is ____
Buoyancy is independent of the vertical position and orientation .
24. In the converging part of a horizontal venturimeter ____
Static pressure gradually decreases .
25. A steady flow of fluid crossing a normal shock - wave undergoes a sudden rise in ___
Both static pressure and static temperature .
26. Cavitation is a phenomenon observed ____
In all of centrifugal pumps , hydraulic reaction turbines and marine propellers .
27. In case of a gear pair with involute tooth profile , the pressure angle through out the contact is ____
Constant .
28. The number of links in a planar mechanism with revotute joints having 10 instantaneous centres is ______
5 .
n(n-1)/2 = 10
20 = n(n-1)
n = 5 , - 4
29. Which one of the following statement is true ?
In the principal planes , shear stresses are always zero but in the maximum shear planes , normal stresses may or may not be zero .
30. Radial pressure in a hydrodynamic bearing is ____
Maximum where film thickness is minimum .
31. Herringbone gears are used to ____
Eliminate axial thrust .
32. Consider the following statements about heat and work ____
- Both are path function .
- Heat is low grade energy and work is high grade energy .
- Energy of the system is conserved .
- Entropy of the system increases .
34. For an ideal gas , the slope of the constant - volume line in the T-S diagram is _____
Lower than the slope of the constant pressure line .
35. Joule - Thomson coefficient for an ideal gas in a throattling process is _____
Equal to zero at all temperatures and pressures .
36. For the flow of a Newtonian fluid with constant density and viscosity . The governing equation is the _____
Navier - Strokes Equation .
37. In a two - dimensional flow of a viscous fluid , couette flow is defined for _____
Laminar flow between a fluid and a moving plate .
38. Blasius equation for a flat plate laminar boundary layer flow is a third order ____
Nonlinear partial differential equation .
39. Which one of the following properties drops across a normal shock ?
Stagnation Pressure
40. Choose the correct statement for a quasi - one dimensional supersonic flow through a variable area duct .
Velocity increases when area increases .
Match List 1 and List 2 :
| List 1 | List 2 |
|---|---|
| (a) Stanton Number | (A) Forced Convection |
| (b) Mach Number | (B) Compressibility |
| (c) Weber Number | (C) Surface Tension |
| (d) Grashof Number | (D) Free Convection |
| (e) Schmidt Number | (E) Mass Transfer |
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