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Electrical Engineering Questions and Answers January 31, 2020

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A Resistance temperature detector (RTD) is placed in a bridge circuit shown below with a 10k2 potentiometer. The RTD has resistance of 4002 at 22C and a temperature coefficient (ao) of 0.004 C. When the potentiometer is adjusted to 3.26 k2, the bridge is balanced. Determine the temperature. 2000 1kN 9V 2.14kN RTD

A silicon diode has a saturation current of 10 nA at 25C If it operates over a temperature range of 0 to 75C, what are the minimum and maximum values of saturation current?

A threestage amplifier is to have an overall noise temperature no greater than 70 K. The overall gain of the amplifier is to be at least 45 dB. The amplifier is to be built by adding a lownoise first stage to an existing twostage amplifier that has the gains and noise figures shown below. (The stage numbers refer to locations in the new

A time function f(t) is multiplied by a periodic set of unit impulses, as shown in Fig. P2-47. The Fourier transform F() is band-limited to (has no frequency components above) B hertz as shown. Use frequency convolution to find the spectrum at the multiplier output. Sketch the three cases 1/T = 4B, 1/T = 2B, and 1/T = B.

f (Hz) B f(t) 27 .0 s Im

Assume you are asked to design a photovoltaic (PV) based power supply to power on the 12 V DC loads (Tablets, CD players, etc) that you can find at your home, The power supply shall be able to output constant 12 V when the PVs voltage is changing between 4 V and 36 V. If a flyback converteris used i e N2 N1 S1 What is the transformer duty ratio,

Design a counter with T flip flops that goes through the following binary repeated sequence 0,1,3,7,6,4. Show that when the states 010 and 101 are considered as don't care conditions the counter may not operate properly.
Design a counter with T flip flops that goes throu

Present Next state state ABC ABC TA 000 001 010 011 100 101 110 111 Flipflop inputs TB TB Tc 1 0 001 0 011 0 XXX 111 000 X 1 1 XXX X 100 0 110 0 0 1 X 1 1 X 0 0 X X 1 0 0 1
Design a counter with T flip flops that goes throu

For the emitter-follower circuit shown in Fig.P7.134, the BJT used is specified to have ? values in the range of 50 to 200 (a distressing situation for the circuit designer). For the two extreme values of ? (?=50 and ?=200), find: (a) I E , V E , and V B (b) the input resistance R in (c) the voltage gain v o /v sig
10 kn Figure P7.134 100 kn 3 V kn 1 kn 1

10 www Figure P7.134 Rin 100 ww 3V 1
10 kn Figure P7.134 100 kn 3 V kn 1 kn 1