Tag: science & technology

CDRAM (Cache DRAM) is not a standard type of computer RAM. The common RAM types include DDR I, DDR II, DDR3, DDR4, and SDRAM (Synchronous DRAM). CDRAM is the correct answer as it's not a standard RAM category.

Page faults occur when the system needs to access data that has been moved from RAM to virtual memory on disk. While the question states 'due to RAM,' it's more accurate to say page faults occur due to insufficient RAM or the virtual memory paging system. However, given the options, RAM is the best answer as PROM, ROM, and CD R/W are not involved in virtual memory management.

In metal cutting operations, chips are formed primarily due to shear deformation. The cutting tool applies force that causes the material to shear along a shear plane, creating chips that curl and break away. Linear deformation and translation are not the primary mechanisms.

A combination set is a precision measuring tool that can check angular surfaces, but it cannot draw circles or scribe lines. Option D 'all of these' is incorrect because the tool's capabilities are limited to measurement and checking functions, not marking or drawing.

Bernoulli's equation cannot be applied when the flow is turbulent because the equation assumes steady, inviscid, and irrotational flow. Turbulent flow involves chaotic motion and energy dissipation that violate these fundamental assumptions. While rotational and unsteady flows also have limitations, turbulent flow is the most definitive exclusion.

Spherical roller bearings have a self-aligning feature because the barrel-shaped rollers can accommodate shaft misalignment. This design allows the bearing to adjust to angular deflection and shaft deflection without damage, making it ideal for applications where perfect alignment cannot be maintained.

Kaplan turbine is a low head axial flow turbine designed for applications with low water heads but high flow rates. Unlike Francis or Pelton turbines, Kaplan blades are adjustable to maintain efficiency across varying flow conditions. The option text appears truncated but the core concept is correct.

Rain drops are spherical because of surface tension, which minimizes the surface area for a given volume. Surface tension acts equally in all directions, pulling the water into a shape with the smallest surface area - a sphere. Viscosity, air resistance, and atmospheric pressure affect falling behavior but not the spherical shape.

In a rigid flanged coupling, bolts are primarily loaded in shear due to the torque transmitted between shafts. The rigid connection also creates bending moments in the bolts because the flanges cannot rotate relative to each other, causing the bolts to resist both shear and bending. Axial force alone (B) is incorrect because the primary load is not along the bolt axis. Pure torsion (C) doesn't apply to bolts in this configuration. While torsion exists in the shafts, the bolts themselves experience shear and bending, not shaft torsion.