Why are vacuum tubes also called valves? A) Because they can amplify the weak signals and make them strong B) Because they can stop or allow the flow of current C) Both of above D) None of above

  Why are vacuum tubes also called valves? A) Because they can amplify the weak signals and make them strong B) Because they can stop or allow the flow of current C) Both of above D) None of above
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Which of the following is not a feature of first generation computers A) They used vacuum tubes or valves as main electronic component B) They consumed lots of electricity and produced excessive heat C) They used machine language and assembly language to program the machine D) None of above

Description : Which of the following is not a feature of first generation computers A) They used vacuum tubes or valves as main electronic component B) They consumed lots of electricity and produced excessive heat C) They used machine language and assembly language to program the machine D) None of above

Last Answer : Answer : C

The main electronic component used in first generation computers was A) Transistors B) Vacuum Tubes and Valves C) Integrated Circuits D) None of above

Description : The main electronic component used in first generation computers was A) Transistors B) Vacuum Tubes and Valves C) Integrated Circuits D) None of above

Last Answer : Answer : B

Chief component of first generation computer was A) Transistors B) Vacuum Tubes and Valves C) Integrated Circuits D) None of above

Description : Chief component of first generation computer was A) Transistors B) Vacuum Tubes and Valves C) Integrated Circuits D) None of above

Last Answer : Answer : B

Chief component of first generation computer was a. Transistors b. Vacuum Tubes and Valves c. Integrated Circuits d. None of above

Description : Chief component of first generation computer was a. Transistors b. Vacuum Tubes and Valves c. Integrated Circuits d. None of above

Last Answer : Vacuum Tubes and Valves

Chief component of first generation computer was a. Transistors b. Vacuum Tubes and Valves c. Integrated Circuits d. None of above

Description : Chief component of first generation computer was a. Transistors b. Vacuum Tubes and Valves c. Integrated Circuits d. None of above

Last Answer : b. Vacuum Tubes and Valves

Chief component of first generation computer was a. Transistors b. Vacuum Tubes and Valves c. Integrated Circuits d. None of above

Description : Chief component of first generation computer was a. Transistors b. Vacuum Tubes and Valves c. Integrated Circuits d. None of above

Last Answer : b. Vacuum Tubes and Valves

What does manual gain control do to strong and weak signals, respectively?

Description : What does manual gain control do to strong and weak signals, respectively?

Last Answer : Attenuates the strong and amplifies the weak.

Which of the following statements comparing transistors and vacuum tubes is correct? A. Both transistors and vacuum tubes have a cathode that must be heated to give off electrons. B. A vacuum tube must have a heated cathode, where transistors do not. C. Neither transistors nor vacuum tubes require heat for electrons to flow. D. The anode of both transistors and vacuum tubes must be heated to give off electrons.

Description : Which of the following statements comparing transistors and vacuum tubes is correct? A. Both transistors and vacuum tubes have a cathode that must be heated to give off electrons. B. A vacuum tube must ... flow. D. The anode of both transistors and vacuum tubes must be heated to give off electrons.

Last Answer : Answer: B

The common-emitter transistor circuit can amplify a small current signal because a small change in the signal current produces one of the following. Does the change in signal produce a large change in the: w) emitter-base voltage x) base current y) collector current z) collector voltage

Description : The common-emitter transistor circuit can amplify a small current signal because a small change in the signal current produces one of the following. Does the change in signal produce a large change in the: w) emitter-base voltage x) base current y) collector current z) collector voltage

Last Answer : ANSWER: Y -- COLLECTOR CURRENT

What was the main disadvantage of vacuum tubes? A) They were larger in size B) They consumed a lot of electricity C) They produced heat and often burned out D) The operation cost was high

Description : What was the main disadvantage of vacuum tubes? A) They were larger in size B) They consumed a lot of electricity C) They produced heat and often burned out D) The operation cost was high

Last Answer : Answer : C

First generation computers used for memory A) vacuum tubes B) silicon chips C) magnetic drum D) RAM

Description : First generation computers used for memory A) vacuum tubes B) silicon chips C) magnetic drum D) RAM

Last Answer : Answer : C

Which electronic component was made out of semiconductor material? A) Vacuum tubes B) Transistors C) ICs D) All of above

Description : Which electronic component was made out of semiconductor material? A) Vacuum tubes B) Transistors C) ICs D) All of above

Last Answer : Answer : C

Who invented vacuum tubes? A) John Bardeen B) William Shockley C) Lee de Forest D) All of above

Description : Who invented vacuum tubes? A) John Bardeen B) William Shockley C) Lee de Forest D) All of above

Last Answer : Answer : C

First Generation computers used ______ for Circuitry and ________ for memory (A) Transistor and Magnetic Core (B) IC and Magnetic Memory (C) Vacuum tubes and Magnetic drum (D) IC and Magnetic Core

Description : First Generation computers used ______ for Circuitry and ________ for memory (A) Transistor and Magnetic Core (B) IC and Magnetic Memory (C) Vacuum tubes and Magnetic drum (D) IC and Magnetic Core

Last Answer : (C) Vacuum tubes and Magnetic drum

First generation computer systems used 1) Transistors 2) Vacuum tubes 3) Magnetic cores 4) Silicon chips

Description : First generation computer systems used 1) Transistors 2) Vacuum tubes 3) Magnetic cores 4) Silicon chips

Last Answer : 2) Vacuum tubes

Which electronic component was use in first generation? 1) Vacuum tubes 2) transistors 3) IC chips 4) all above

Description : Which electronic component was use in first generation? 1) Vacuum tubes 2) transistors 3) IC chips 4) all above

Last Answer : 1) Vacuum tubes

Which electronic component was use in first generation? 1 Vacuum tubes 2 transistors 3 IC chips 4 all above

Description : Which electronic component was use in first generation? 1 Vacuum tubes 2 transistors 3 IC chips 4 all above

Last Answer : 1 Vacuum tubes

Fifth generation computers do not have : (1) Speech recognition (2) Artificial intelligence (3) Very large scale integration (4) Vacuum tubes

Description : Fifth generation computers do not have : (1) Speech recognition (2) Artificial intelligence (3) Very large scale integration (4) Vacuum tubes 

Last Answer : Vacuum tubes

A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Description : A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Last Answer : (2) A sphere has the least surface area for a given volume Explanation: A drop of liquid assumes spherical shape because a sphere has the least surface area for a given volume.

A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Description : A drop of liquid assumes spherical shape because: (1) Intermolecular forces are strong in liquids (2) A sphere has the least surface area for a given volume (3) A sphere has the largest surface area for a given volume (4) Inter molecular forces are weak in liquids

Last Answer : A sphere has the least surface area for a given volume

Capacitance in an AC circuit will _____________. A. stop current flow once the capacitor is fully charged B. allow current flow in only one direction C. oppose any change in circuit voltage D. rectify the current

Description : Capacitance in an AC circuit will _____________. A. stop current flow once the capacitor is fully charged B. allow current flow in only one direction C. oppose any change in circuit voltage D. rectify the current

Last Answer : Answer: C

How much can I amplify my speakers without breaking them?

Description : How much can I amplify my speakers without breaking them?

Last Answer : When it comes to amplifying your speakers without blowing them it all depends really on what kind of speakers they are . Usually you can only put them mid way without blowing them completly , as having them on high on the time will completely destroy them in no time .

Does anybody make vacuum tubes anymore? All I ever find are surplus.

Description : Does anybody make vacuum tubes anymore? All I ever find are surplus.

Last Answer : answer:Without details as to type, there are over 39,000 currently listed on eBay. I’d say they’re still manufactured since there’s also availability on Amazon.

Each hydrogen bond is quite (A) Weak (B) Strong (C) Both (A) and (B) (D) None of these

Description : Each hydrogen bond is quite (A) Weak (B) Strong (C) Both (A) and (B) (D) None of these

Last Answer : Answer : A

Theories of elastic failure help to recognize (a) Weak materials (b) Strong materials (c) Both weak and strong materials (d) None

Description : Theories of elastic failure help to recognize (a) Weak materials (b) Strong materials (c) Both weak and strong materials (d) None

Last Answer : (c) Both weak and strong materials

. Highly caking coals (A) Produce weak coke (B) Produce strong coke (C) May damage the coke oven walls during carbonisation (D) Both (B) and (C)

Description : . Highly caking coals (A) Produce weak coke (B) Produce strong coke (C) May damage the coke oven walls during carbonisation (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Concrete is [ A ] Weak in tension [ B ] Strong in tension [ C ] Strong in both tension and compression [ D ] Weak in compression

Description : Concrete is [ A ] Weak in tension [ B ] Strong in tension [ C ] Strong in both tension and compression [ D ] Weak in compression

Last Answer : [ A ] Weak in tension

An OP-AMPs can amplify _______ (a) D.C (b) A.C (c) both A.C & D.C (d) none of aboveAn OP-AMPs can amplify _______ (a) D.C (b) A.C (c) both A.C & D.C (d) none of above

Description : An OP-AMPs can amplify _______ (a) D.C (b) A.C (c) both A.C & D.C (d) none of above

Last Answer : b) A.C

Why vacuum tubes are not preferred at microwave?

Description : Why vacuum tubes are not preferred at microwave?

Last Answer : Actually three special purpose vacuum tubes were specifically designed for microwave usage and are in some cases still the least expensive way to work with high power microwave signals.These ... and the electromagnetic compatibility (EMC) testing industry for immunity testing of electronic devices)

Heat sinks are frequently used with _____________. A. power transistors B. vacuum tubes C. tunnel rectifier diodes D. all of the above

Description : Heat sinks are frequently used with _____________. A. power transistors B. vacuum tubes C. tunnel rectifier diodes D. all of the above

Last Answer : Answer: A

The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission

Description : The method used to produce electron emission in most vacuum tubes is known as ____________. A. photoelectric emission B. secondary electric emission C. cold cathodic electric emission D. thermionic emission

Last Answer : Answer: D

The HPAs in most satellite are A. TWTs B. Klystrons C. Vacuum tubes D. Magnetrons

Description : The HPAs in most satellite are A. TWTs B. Klystrons C. Vacuum tubes D. Magnetrons

Last Answer : A. TWTs

Vacuum tubes have been replaced by-----? A. Conductors B. Diodes C. Transistors (Answer) D. None of these

Description : Vacuum tubes have been replaced by-----? A. Conductors B. Diodes C. Transistors (Answer) D. None of these

Last Answer : C. Transistors (Answer)

Pick out the wrong statement. (A) The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system (B) Entering velocity of the liquid in the tubes of natural circulation evaporators is in the range of 0.3 to 0.9 metre/second (C) Duhring's plot is used for calculating the concentration of solution (D) In a multiple effect evaporation system, the number of effects is limited by the total boiling point rise

Description : Pick out the wrong statement. (A) The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system (B) Entering velocity of the liquid in ... a multiple effect evaporation system, the number of effects is limited by the total boiling point rise

Last Answer : (C) Duhring's plot is used for calculating the concentration of solution

This invention replaced vacuum tubes and made computers much smaller and faster. However, it was eventually replaced by another invention (i) RAM (ii) ENIAC (iii) Transformer (iv) Transistor.

Description : This invention replaced vacuum tubes and made computers much smaller and faster. However, it was eventually replaced by another invention (i) RAM (ii) ENIAC (iii) Transformer (iv) Transistor.

Last Answer : (iv) Transistor.

How did vacuum tubes cause a problem for first generation computers

Description : How did vacuum tubes cause a problem for first generation computers

Last Answer : They were unreliable, required a lot of power to run, and produced so much heat that air conditioning was needed to protect computer parts.

In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?

Description : In electronic computers, vacuum tubes were replaced by transistors and transistors have been replaced by what device?

Last Answer : Integrated circuits.

When designing vacuum-tube circuits, what characteristics of tubes must be taken into consideration?

Description : When designing vacuum-tube circuits, what characteristics of tubes must be taken into consideration?

Last Answer : Differences in performance of tubes of the same type

Vacuum tubes are designed to operate in what portion of the Ep - Ip

Description : Vacuum tubes are designed to operate in what portion of the Ep - Ip

Last Answer : The linear portion.

is Ohms law applicable to vacuum tubes?

Description : is Ohms law applicable to vacuum tubes?

Last Answer : Ohm's law is not applicable to vacuum tubes.

Firewall: (a) Amplifies weak outgoing signals to stronger ones -Technology

Description : Firewall: (a) Amplifies weak outgoing signals to stronger ones -Technology

Last Answer : (d) A firewall can either be software based or hardware based and is used to prevent intruders from accessing your system.

Stacking antenna elements A. increases sensitivity to weak signals B. will suppress odd harmonics C. decrease signal to noise ratio D. increases selectivity

Description : Stacking antenna elements A. increases sensitivity to weak signals B. will suppress odd harmonics C. decrease signal to noise ratio D. increases selectivity

Last Answer : A. increases sensitivity to weak signals

Collects very weak signals from a broadcast satellite A. Helical antenna B. Satellite dish C. LNA D. TWT

Description : Collects very weak signals from a broadcast satellite A. Helical antenna B. Satellite dish C. LNA D. TWT

Last Answer : B. Satellite dish

ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the same as that of the intermediate frequency C. Generates a 1kHz note for Morse code reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

Description : ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the ... reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

Last Answer : C. Generates a 1kHz note for Morse code reception

For a weak entity set to be meaningful, it must be associated with another entity set in combination with some of their attribute values, is called as : (A) Neighbour Set (B) Strong Entity Set (C) Owner entity set (D) Weak Set

Description : For a weak entity set to be meaningful, it must be associated with another entity set in combination with some of their attribute values, is called as : (A) Neighbour Set (B) Strong Entity Set (C) Owner entity set (D) Weak Set

Last Answer : (C) Owner entity set 

How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and humid inside air c) Due to the given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Description : How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and ... given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Last Answer : Natural pressure head density between cold outside air and humid inside air

How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and humid inside air c) Due to the given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Description : How does the flow of air occur in natural draught cooling towers? a) Natural pressure head density between cold outside air and humid inside air b) Variation in pressure of both cold outside air and ... given air vents and vacuum ports d) Because of difference in the volume of both the of airs

Last Answer : Natural pressure head density between cold outside air and humid inside air

Is there a strong or weak connection between spirituality and organization?

Description : Is there a strong or weak connection between spirituality and organization?

Last Answer : I think the two are totally unconnected.

Character design question: is this superpower too weak? Too strong? Utterly useless? Details in the details section.

Description : Character design question: is this superpower too weak? Too strong? Utterly useless? Details in the details section.

Last Answer : If they can overhear morse code, they will hear telephone conversations. I remember when I was a young teen, delivering newspapers on wet mornings, I could stand next to a certain telephone pole, and actually ... for 33 years, I will tell you I still don't understand how that happened, but it did.

I'm weak, but I'm strong. I have no powers, but I'm powerful. What am I? -Riddles

Description : I'm weak, but I'm strong. I have no powers, but I'm powerful. What am I? -Riddles

Last Answer : Feelings.