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1. Why must a modem be used to transmit binary data through a PSTN?
(1) Use sketches and additional text to describe the following modulation methods.
(a) Amplitude shift keying
(b) Frequency shift keying
(2) Discuss the factors that in?uence the choice of carrier frequency and the bandwidth used by the demodulator section of a modem.
Discuss mode -2 (bi-directional mode) of 8255 (Programmable Peripheral Interface). Only permitted with port A. Bi-directional bus data used for interfacing two computers and GP
If a television station operates on UHF channel 20 (band 506-512 MHz), determine the station's visual-carrier frequency.
Q. Explain why equalizing connection are used in lap winding and dummy coils are some time used in wave winding. Sol. For batteies operating in parallel, the circulating c
Ferroelectric materials are characterised by (A) Very high degree of polarisation. (B) A sharp dependence of polarisation on temperature. (C) Non-linear dependence o
Explain the Architecture of 8085. Ø ALU Ø Interrupt control Ø Serial I/O control Ø Timing and control unit Ø Instruction Register & Decoding
advantage and disadvantage of alloying steel with silicon
Q. What is Induction machines? We shall first consider polyphase induction motors and then single-phase induction motors. The polyphase induction motors used in industrial appl
Scatter Diagrams - Quality Tools for Improvement Scatter diagrams are graphical tools which attempt to depict the influence in which one variable has on another. A general dia
Explain the construction and working of Calomel electrode
Show how a typical DMA controller can be interfaced to an 8086/8085 based maximum mode system. For 8088 in maximum mode: The RQ/GT1 and RQ/GT0 pins are utilized to issue DMA
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