The noise produced by a ___________ cooled machine is less as the rotor moves in a medium of smaller density?

Related Mcqs:

Materials exhibiting zero value of resistivity are known as ____________ ?

A. conductors B. semiconductors C. insulators D. superconductors...

By which of the following methods motor rating for variable load drives can be determined ?

A. Method of average losses B. Equivalent current method C. Equivalent torque method D. Equivalent power method E. All of the above...

In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?

A. 5 percent B. 10 percent C. 15 percent D. 30 percent E. none of the above...

D.C. servomotors are used in______________?

A. purely D.C. control systems B. purely AC. control systems C. both D.C. and AC. control systems D. none of the above...

The forced oil and air circulation method is usual one for transformers of capacities____________?

A. upto 5 MVA B. upto 10 MVA C. upto 20 MVA D. 30 MVA upwards...