GATE ECE 1990 | GATE ECE Year Wise Previous Years Questions

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GATE ECE 1990

MCQ (More than One Correct Answer)

-0.6

Choose the correct statements.
For a wave propagating in an air filled rectangular wave guide

Guided wavelength is never less than the free space wavelength

Wave impedance is never less than the free space impedance.

Phase velocity is never less than the free space velocity

TEM mode is possible if the dimensions of the wave guide are properly chosen.

GATE ECE 1990

MCQ (Single Correct Answer)

-0.6

Which of the following field equations indicate that the free magnetic charges do not exits?

$$\mathop H\limits^ \to = {1 \over \mu }\,\nabla \, \times \,A$$

$$\mathop H\limits^ \to = \oint {{{Id\,\ell \, \times \,R\,} \over {4\,\,\pi \,\,{R^2}}}} $$

$$\nabla \,.\,\mathop H\limits^ \to = 0$$

$$\nabla \, \times \,\mathop H\limits^ \to = J$$

GATE ECE 1990

Subjective

+10

-0

A 200 volt (r. m. s) generator having an internal resistance of 200 ohm is feeding a loss-less transmission line. The characteristic impedance and the length of the line are 200 ohm and 10 m respectively. The line is terminated in a resistive load of 100 ohm. If the operating frequency is 37.5 MHz calculate the
Current drawn from the generator.
Magnitude and phase of the current flowing in the load.
Power delivered to the load.

GATE ECE 1990

MCQ (Single Correct Answer)

-0.6

The incoming solar radiation at a place on the surface of the earth is 1.2 KW/m².The amplitude of the electric field corresponding to this incident power is nearly equal to

80 mV/m

2.5 V/m

30 V/m

950 V/m

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