21⟩ A DVST monitor1. cannot display colour2. can display 4 colour3. can display 3 colour4. can display many colour
Cannot Display colour
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185 Electronics Engineering Questions And Answers
22⟩ Noise with uniform power spectral density of N0W/Hz is passed through a filter H (w) = 2 exp(-jwtd) followed by an ideal low pass filter of bandwidth BHz. What is the output noise power in Watts?
Please share your answers.
23⟩ How to design binary to gray code converter?
It is easy to convert the binary number to gray number. First, for example take a binary number i.e ,101101.
Step 1: 101101 first write the MSB as it is i.e, darken bit i.e, 1
Step 2: add MSB and bit next to the MSB i.e, 1+0=1
Step 3: again add 0 and 1 we get i.e, 0+1=1
Step 4: again add 1 and 1 we get 1+1=0
Step 5: in previous step carry is occurred so neglect that carry . note that don't add carry to next add numbers
then again add 1+0 1+0=1
step 6: add 0+1 0+1= 1
Answer: Gray Code is : 111011
24⟩ Explain how does frequency affect the size of smps?
If frequency of SMPF is reduced capacitor size is increased SMPF size also increased.
25⟩ When a small amount of Cu is added to a Ni conductor, then the?a) Resistivity of Ni will decrease at all temperatures because Cu is better conductor than Nib) Residual resistivity of Ni at low temperatures will increase as Cu atoms acts as defect centersc) Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defectsd) Resistivity of Ni remains unaltered as Cu atoms give the same numbers of free electrons as Ni atoms
c) Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
26⟩ Explain how to convert binary to gray code and vice-verse?
for eg: code is 1101
this must be convert binary to gray then first 1 written as it is, 1 XOR 1
,1 XOR 0, 0 XOR 1.
then the gray code is 1 0 1 1
27⟩ How to program Micro controller?
A Micro controller can be directly connected to external devices. But a Processor needs a interface controller to connect with external input and output devices.
28⟩ Tell me why is 400 Hz used for flight instruments and Radio Transmission System in Aviation Industry universally?
You need some sort of AC for power transmission and distribution inside of aircraft. Power companies use 50/60Hz because any higher frequency results in excessive inductive and capacitive losses, given the many miles that have to transfer power over. But a higher frequency gives you lots of advantages in transformer and motor weight, and over the short distances in an aircraft, the inductive and capacitive losses are not excessive. So overall, the higher frequency saves weight, and for aircraft, that is important. Like all designs, the choice of 400 Hz is a compromise between losses and low weight.
29⟩ What is Micro controller?
Micro controller = micro processor + memory + interfacing features(ports) + additional features like counters.
30⟩ Tell me how to calculate knee point voltage? Describe its purpose for differential protection
10 % increase in voltage gives you 50 % increase in excitation current is called knee point voltage. To measure this first demagnetise the CT and apply voltage gradually from secondary keeping primary winding open circuited. while doing this above phenomeneo will be observed.
31⟩ Explain why does all cellular networks have same shape of SIM? Why is it designed in such a particular shape? Does it have any other shape?
All SIM are of same shape because cellular phones when manufactured in industries, didn't know that which SIM the customer is going to use. It has to be universal so that the cellular phones can be used with any network connection SIM.
32⟩ Explain at what voltage does land line telephone operate?
The normal telephone system works on -48vDC on hook when the phone goes off hook, the voltage drops to about 10v but reverses polarity.
33⟩ What is the Value of binary number with n digit, all of which are unity?a) 2 to the power nb) 2 to the power (n-1)c) (n square) - 1d) (2 to the power n) - 1
The answer is D
For eg. consider 1111 which has 4 digits
2^4=16
(2^4)-1=15
34⟩ In a binary data sequence, the duration of symbol 0 or 1 is 1ms. If a carrier of freq 4khz is used in ASK, What is the minimum transmission bandwidth required? What is min bandwidth?
Please share your experience.
35⟩ Why cannot we use LEDs for rectification purpose?
LED is not designed for resctifier purpose, even though theoritically it can be use, but the nature of the current flow capacity of LED is not suitable to be used as reactifier.
36⟩ What is Transponder? Give the difference between Transducer and Transponder?
Transducer is a sensor while transponder is an amplifier.
37⟩ How to measure frequency without CRO?
We can also measure frequency by Frequency meter and frequency analyzer.
Please check it out.
38⟩ Can we get light when the circuit is working?
LED works in micro Amps to few miliamps only, whre usually rectifier flown electrical current in way larger Amps (from few Amps to thousands Amps).
39⟩ What frequency bands are used in Satellite Communication?
C band
40⟩ The function of a transistor used in any of the ICs is to perform SWITCHING action and not AMPLIFICATION.Then why DIODES are not used instead of TRANSISTORS as diodes also exhibit the same switching action?
I agree Digital ICs use transistors as switches. But Analog (Linear) ICs Do Use transistors as Amplifiers. Consider the differential pair of transistors that form the front end of an op amp. The advantage of transistors over diodes, is that transistors have a control input and diodes do not. You can use the bipolar transistor's base input (or the gate input of a CMOS transistor) to control a larger current with amplification, or overdrive to turn On/Off.
