Electronics Engineering Questions And Answers

121⟩ Why FET is known as voltage control device?

Since in an FET the value of the current depends upon the value of the voltage applied at the gate and drain so it is known as voltage controlled device.

For example: In a MOSFET, the current from drain to source depends upon the width of the depletion layer which in turn depends upon the voltage applied on the gate so that is the reason.

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122⟩ Tell me why the feeding frequency to a microprocessor is twice the operating frequency?

In 8085 there is an internal circuit wich devides the frequency feeded by external device by two.. 8085 operating frequency is 3MHZ we have to feed 6MHZ to it

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123⟩ What is the length of IR(Instruction register)1. 6 bits 2. 8 bits3. 12 bits 4. 16 bits

Length IR depends on type arch we are using 8085 it's 8 bits in 8086 16 bits and in mips we have 32 and 64.

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124⟩ What problem arise if we use regulators without/before filters?

Filters are used for reducing ripples. A regulator output will be having many ripples. So filters are used in a circuit for conversion of pulsating AC to DC

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125⟩ Fermi level for an intrinsic semiconductor lies midway between the valence and conduction bands, because.a) the temperature does not influence its position.b) the effective mass of hole is greater than that of electronc) the effective mass of electron is taken equal to that of holed) none of the aboveWhich is the right option?

Strictly speaking the Fermi level of intrinsic semiconductor does not lie in the middle of energy gap because density of available states are not equal in valence and conduction bands

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126⟩ What is the difference between LEDs and PN junction diode?

Led is made of compound elements i.e combination of two elements like GaAs,Gaph etc..the light emission is due to transmission of electrons...it is also a PN junction diode...A elementary compound can never act as a LED like SI,GE.

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127⟩ What is negative frequency?

it can't be negative because freguency is simply the reciprocal of time and time can't be negative.

We use negative frequencies in our calculations just for easieness but remember at last we neglect it also.

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128⟩ If the input J is connected through K input of J-K flip-flop,the flip-flop will behave as a1. D(Delay) type flip-flop2. T-type flip-flop3. Toggle Switch4. 2 or 3 above

T-type Flip Flop

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129⟩ Explain why we are using the bridge rectifier in most of the circuits instead of full wave rectifier even though the output of both are same?

TUF for bridge rectifier is 81.2% compared to 57.4% of center tapped .

Also an ordinary transformer is enough.

PIV across a diode is just Vm.

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130⟩ Tell me how many mosfet switches are there in dynamic ram?

there are 16 mosfet switches in a DRAM

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131⟩ Which one of the following is used for high speed power application?a) BJTb) MOSFETc) IGBTd) TRIAC

c) IGBT

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132⟩ Explain why regeneration is not possible in semiconductor

Please share your answers.

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133⟩ What is the effect of increase resistance on reluctance?

The rate of flow of charge(called as current) is inversely proportional to the resistance of the conductor through which the current is flowing in a particular direction. i.e. when we increase the resistance the current magnitude goes down and vice-versa. And thus the flow of current can be easily controlled by deploying proper resistance.

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134⟩ How will you determine what frequency the device has without using oscilloscope?

The frequency of a device can also be calculated by the method below:-

Speed of light (c) =299,792,458 m/s. Planck constant (h) =4.13566733E'15 eV s (1E-15 denotes "10 in power -15")

Frequency(Hz) = Energy/h=Energy/4.13566733E'15 eV s. Energy needs to be expressed in "electron volt (eV)" units. For example, to calculate the wavelength of the ultraviolet (UV) light with the energy 4.5 eV: Frequency =4.5 eV/4.13566733E'15 eV s=1.09E15 Hz=1,090 THz. Note the prefix "Tera(T)-" implies the magnitude of 1E12

Divide the speed of light by the wavelength to calculate frequency. Frequency (Hz) = c/ wavelength(m) =299,792,458 (m/s)/frequency. For example, to calculate the frequency of the visible red light with the wavelength of 700 nanometers (nm): 700 nm equals to 7E-7 m. Wavelength=299,792,458 (m/s)/7E-7m= 4.28E14=428 THz.

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135⟩ What is power electronics?

Power electronics is the technology associated with high power which is more than 430v 3 phase supply.Generally it is consider in industries for the efficient conversion, control and conditioning of electric power by static means from its available input form into the desired electrical output form.

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136⟩ Thermistors Resistancea) increases as heat increasesb) decrease as heat increasesC) remains constantd) It is nowhere related to heat.

Answer is (b) heat is nothing but the temperature, so thermistor resistance decreases with increasing temperature.

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137⟩ How to convert a JK flip flop into SR flip flop and vice versa, a SR flip flop into D or T flip flop and vice versa?

An SR flip flop can be converted to D flip flop by shorting S terminal through a Not gate or inverter and applying it to R terminal and the S terminal is kept the same as in SR flip flop.

To convert SR to JK flip flop an extra input to the gate is applied to first gate in both cases. That is in extra to the input and clock at S an input is also given from complement of Q to get J at S terminal and at K terminal an input from Q is given in extra to input and clock.

JK can be converted to T by shorting J and K terminal of JK flip flop.

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138⟩ In information system design, to increase the adaptability of the system1. the subsystems should be defined so that each performs a single complete function2. the interconnections between subsystems should be increased3. internal working of another module with the system should be increased4. nothing should be done

3. internal working of another module with the system should be increased

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139⟩ A computer system has 4k word cache organised in a block-set-associativemanner, with 4 blocks per set,64 words per block. The number of bits in the SET and WORD fields of the main memory address format is1. 15,4 2. 6,43. 7,2 4. 4,6

2. 6,4

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140⟩ Which of the following statement about bit-slice processors is correct ?1. they can be cascabed to get any desired word length processor2. their speed of operation is independent of the word length configured3. they do not contain anything equivalent of a program counter in a normal micro-processor4. they contain only the data path of a normal CPU

2. their speed of operation is independent of the word length configured

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Electronics Engineering

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185 Electronics Engineering Questions And Answers

121⟩ Why FET is known as voltage control device?

122⟩ Tell me why the feeding frequency to a microprocessor is twice the operating frequency?

123⟩ What is the length of IR(Instruction register)1. 6 bits 2. 8 bits3. 12 bits 4. 16 bits

124⟩ What problem arise if we use regulators without/before filters?

126⟩ What is the difference between LEDs and PN junction diode?

127⟩ What is negative frequency?

128⟩ If the input J is connected through K input of J-K flip-flop,the flip-flop will behave as a1. D(Delay) type flip-flop2. T-type flip-flop3. Toggle Switch4. 2 or 3 above

129⟩ Explain why we are using the bridge rectifier in most of the circuits instead of full wave rectifier even though the output of both are same?

130⟩ Tell me how many mosfet switches are there in dynamic ram?

131⟩ Which one of the following is used for high speed power application?a) BJTb) MOSFETc) IGBTd) TRIAC

132⟩ Explain why regeneration is not possible in semiconductor

133⟩ What is the effect of increase resistance on reluctance?

134⟩ How will you determine what frequency the device has without using oscilloscope?

135⟩ What is power electronics?

136⟩ Thermistors Resistancea) increases as heat increasesb) decrease as heat increasesC) remains constantd) It is nowhere related to heat.

137⟩ How to convert a JK flip flop into SR flip flop and vice versa, a SR flip flop into D or T flip flop and vice versa?

139⟩ A computer system has 4k word cache organised in a block-set-associativemanner, with 4 blocks per set,64 words per block. The number of bits in the SET and WORD fields of the main memory address format is1. 15,4 2. 6,43. 7,2 4. 4,6

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Electronics Engineering

Home Engineering Electronics Engineering

185 Electronics Engineering Questions And Answers

121⟩ Why FET is known as voltage control device?

122⟩ Tell me why the feeding frequency to a microprocessor is twice the operating frequency?

123⟩ What is the length of IR(Instruction register)1. 6 bits 2. 8 bits3. 12 bits 4. 16 bits

124⟩ What problem arise if we use regulators without/before filters?

126⟩ What is the difference between LEDs and PN junction diode?

127⟩ What is negative frequency?

128⟩ If the input J is connected through K input of J-K flip-flop,the flip-flop will behave as a1. D(Delay) type flip-flop2. T-type flip-flop3. Toggle Switch4. 2 or 3 above

129⟩ Explain why we are using the bridge rectifier in most of the circuits instead of full wave rectifier even though the output of both are same?

130⟩ Tell me how many mosfet switches are there in dynamic ram?

131⟩ Which one of the following is used for high speed power application?a) BJTb) MOSFETc) IGBTd) TRIAC

132⟩ Explain why regeneration is not possible in semiconductor

133⟩ What is the effect of increase resistance on reluctance?

134⟩ How will you determine what frequency the device has without using oscilloscope?

135⟩ What is power electronics?

136⟩ Thermistors Resistancea) increases as heat increasesb) decrease as heat increasesC) remains constantd) It is nowhere related to heat.

137⟩ How to convert a JK flip flop into SR flip flop and vice versa, a SR flip flop into D or T flip flop and vice versa?

139⟩ A computer system has 4k word cache organised in a block-set-associativemanner, with 4 blocks per set,64 words per block. The number of bits in the SET and WORD fields of the main memory address format is1. 15,4 2. 6,43. 7,2 4. 4,6

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