National Digital Library

Govt. Of India has created #National_Digital_Libray for students for all subjects. Below is the link

It contains 4 crore 60 lakhs books.

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Gate Questions paper 2022 with answer

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1:-  In the circuit shown below, the initial charge on the capacitor is 2.5 mC, with the voltage polarity as indicated . The switch is closed at time t = 0 the current it at a time t after the switch is closed is  (A) i(t)=15 exp(-2×10³t)A. (B) i(t)= 5 exp(-2×10³)A. (C) i(t) =10 exp(-2×10³)A. (D) i(t) = -5 exp(-2×10³)A. ANSWER :-   i(t)=15 exp(-2×10³t)A 2:- The Z- parameter matrix [z¹¹z¹² z²¹z²²] for the two port network shown is (A):- 0 (B):-  99 (C):- 63 (D):-  12 ANSWER:-               0 3:- If Ē = -(2y³-3yz²)x^ -(6xy²-3xz²)6y^+(6xyz)z^ is the electric field in a source free region a valid expression for the electrostatic potential is (A):- xy³-yz² (B):- 2xy³-xyz² (C):- y³+xyz² (D):-  2xy³-3xyz² ANSWER:-         2xy³-3xyz² 4:-  Two Silicon diodes,with a forward voltage drop of 0.7 v are used in the circuit shown in the figure. The range of input voltage...
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Antenna Theory - Short Dipole

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A  short dipole  is a simple wire antenna. One end of it is open-circuited and the other end is fed with AC source. This dipole got its name because of its length. Frequency range The range of frequency in which short dipole operates is around 3KHz to 30MHz. This is mostly used in low frequency receivers. Construction & Working of Short Dipole The  Short dipole  is the dipole antenna having the length of its wire shorter than the wavelength. A voltage source is connected at one end while a dipole shape is made, i.e., the lines are terminated at the other end. The circuit diagram of a short dipole with length L is shown. The actual size of the antenna does not matter. The wire that leads to the antenna must be less than one-tenth of the wavelength. That is L &lt; &#x03BB; 10 " role="presentation"> L < λ 10 L < λ 10 Where L  is the length of the wire of the short dipole. λ  is the wavelength. Another type of short dipole is infinitesimal dip...
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