W13D1

Online Review

W13 D1

By Monica Elim

Easy Round

By Monica Elim

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MATH

It is the degree of peakedness of a distribution.

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GEAS

The weak attraction experienced by most alkali and transition metals when exposed to an external magnetic field is called

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ELECTRONICS

A mechanism for carrier motion in semiconductors which occurs when an electric field is applied across a piece of silicon

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EST

The process by which nuclei emit α (alpha), β (beta) and γ (gamma) rays in order to attain stability is called

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MATH

It states that the general curve of a system which is linearly independent on a certain number of give irreducible curves will not have a singular point which is not fixed for all the curves of the system.

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GEAS

The evaporation of electrons from a heated surface is called

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ELECTRONICS

It has the same length as a standard half-wave dipole, but it is made with two parallel conductors, joined at both ends and separated by a distance that is short compared with the length of the antenna.

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EST

It is a phenomenon caused by any support insulators used at the ends of the wire antenna.

Moderate Round

By Monica Elim

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MATH

A cube with vertex at the midpoint of the upper edge creates a pyramid inside the cube. What is the total surface area?

By Monica Elim

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GEAS

The marginal income tax rate for Alpha is expected to remain at 38% in the future. Assuming that Alpha’s capital structure (debt ratio) also remain unchanged in the future, determine the cost of capital of raising $10 million in addition to Alpha’s existing capital.

By Monica Elim

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EST

A half-wave dipole antenna is capable of radiating 1-kW and has a 2.15 dB gain over an isotropic antenna. How much power must be delivered to the isotropic antenna, to match the field-strength directional antenna?

By Monica Elim

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GEAS

How fast is an object moving if its apparent mass is to be 1 percent larger than its rest mass.

By Monica Elim

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MATH

Ryan has 800 ft of fencing. He wishes to form a rectangular enclosure and then divide it into three sections by running two lengths of fence parallel to one side. What should the dimensions of the enclosure be in order to maximize the enclosure area?

By Monica Elim

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EST

By how much should two antennas be separated for space diversity in the 11 GHz band?

By Monica Elim

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ELECTRONICS

A signal at the input to a mu-law compressor is positive with its voltage one-half the maximum value. What proportion of the maximum output voltage is produced?

By Monica Elim

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GEAS

An object is placed 20 in of a certain lens. A virtual image was formed at 10 in. determine the focal length of the lens.

By Monica Elim

Difficult Round

By Monica Elim

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GEAS

The Golden Gate Bridge in San Francisco has a main span of 1280 m, a sag of 143 m, and a total static loading of 310.8 kN per linear meter of horizontal measurement. The weight of both of the main cable is included in this load and is assumed to be uniformly distributed along the horizontal. Calculate the midspan tension in each of the main cables.

By Monica Elim

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MATH

What is the area in sq. m of the zone of a spherical segment having a volume of 1470.265 cu. m if the diameter of the sphere is 30 m?

By Monica Elim

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GEAS

Consider a person standing in a breezy room at 22°C. Determine the total rate of heat transfer from this person if the exposed surface area and the average outer surface temperature of the person are 1.2 m^2 and 33°C, respectively, and the convection heat transfer coefficient is 6 W/m^2. ε=0.95 and σ=5.67x10-8 W/m^4 K^4

By Monica Elim

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EST

What is the phase velocity of a rectangular waveguide with a wall separation of 3 cm and a desired frequency of operation of 6 GHz?

By Monica Elim

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ELECTRONICS

A class B push-pull amplifier is supplied with Vcc = 40V. The minimum voltage reached by the collector due to signal swing is Vmin = 8V. The dissipation in both the transistors totals 30 W. What is the conversion efficiency of the amplifier?

By Monica Elim

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GEAS

A 1-lb gas is being compressed; calculate the change in entropy in Btu/R, if the parameters are changing are from 14 psia at 60 degrees F to 84 psia at 460 degrees F.

By Monica Elim

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By Monica Elim

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EST

Determine the Hamming distance for the codewords ( 10101, 11001)

By Monica Elim