1. While an amplifier is used to increase the value of the input voltage, it also amplifies the noise present in the signal. This is because all electronic amplifiers have a certain level of inherent noise that gets added to the signal as it is amplified. However, modern amplifiers are designed with techniques to reduce this noise and provide a clean amplified output.
2. While the maximum grid voltage is produced in one tube, the other tubes in the amplifier circuit can also contribute to the overall amplification process. This is because in certain amplifier configurations, multiple tubes are connected in parallel or in cascade to achieve a higher overall amplification gain. Each tube plays a specific role in the amplification process and contributes to the final amplified output.
3. While direct current plate components are eliminated in an amplifier circuit, it is important to ensure that the alternating current (AC) signal is properly amplified. This is because direct current (DC) does not carry any audio information and needs to be removed from the signal to avoid distortion and other issues. AC signals, on the other hand, carry the desired audio information and need to be amplified accurately without any loss or distortion.
In summary, while an amplifier is used to increase the value of the input voltage, it also amplifies noise. The maximum grid voltage produced in one tube can be supported by other tubes in the circuit, and direct current plate components are eliminated to ensure accurate amplification of the alternating current signal.
1) Somebody broke this window last night.
To form the past simple of irregular verbs, we need to use the second form of the verb. The second form of "break" is "broke". So, the correct form is "broke".
2) I went to the cinema but I did not enjoy the film much.
To form the negative past simple, we use the auxiliary verb "did" followed by "not" and the base form of the verb. The base form of "enjoy" is "enjoy". So, the correct form is "did not enjoy".
3) I was angry because they were late.
The past simple of the verb "be" is "was" for the first person singular (I) and "were" for the third person plural (they). So, the correct form is "was" and "were".
4) I've never hit anybody in my life.
The past simple of the verb "hit" is "hit". So, the correct form is "hit".
5) I bought a ticket to Paris at the airport.
The past simple of the verb "buy" is "bought". So, the correct form is "bought".
6) He left the hotel, took a taxi and drove to the station.
The verbs "leave", "take", and "drive" in the past simple remain the same. So, the correct forms are "left", "took", and "drove".
7) This house cost $35,000 in 1998.
The past simple of the verb "cost" is "cost". So, the correct form is "cost".
8) Philip made no haste to move from where he was sitting.
The past simple of the verb "make" is "made" and the past simple of the verb "be" is "was". So, the correct forms are "made" and "was".
9) I rang the bell, but nobody was at home.
The past simple of the verb "ring" is "rang" and the past simple of the verb "be" is "was". So, the correct forms are "rang" and "was".
10) Who else went to the cinema with Mike yesterday evening?
The past simple of the verb "go" is "went". So, the correct form is "went".
11) Stephanie Meyer wrote great books about vampires.
The past simple of the verb "write" is "wrote". So, the correct form is "wrote".
12) In summer I went for long walks after breakfast.
The past simple of the verb "go" is "went". So, the correct form is "went".
13) It was cold yesterday, so I took my coat with me.
The past simple of the verb "be" is "was" and the past simple of the verb "take" is "took". So, the correct forms are "was" and "took".
14) She put on her coat, took her bag, and left the house.
The past simple of the verbs "put", "take", and "leave" remain the same. So, the correct forms are "put", "took", and "left".
15) Jack grew a beard but now he has shaved it off.
The past simple of the verb "grow" is "grew" and the past simple of the verb "shave" is "shaved". So, the correct forms are "grew" and "shaved".
16) When Jane had her Saturday job at a flower shop, she sent me flowers.
To form the past simple of regular verbs, we use the second form of the verb. The second form of "have" is "had" and the second form of "send" is "sent". So, the correct forms are "had" and "sent".
17) Princess Diana did a lot of work for charity.
The past simple of the verb "do" is "did". So, the correct form is "did".
18) Elvis Presley sang lots of hit songs.
The past simple of the verb "sing" is "sang". So, the correct form is "sang".
19) He hurt his leg when he fell off his skateboard.
The past simple of the verbs "hurt" and "fall" remain the same. So, the correct forms are "hurt" and "fell".
20) They got into the car and drove away.
The past simple of the verb "drive" is "drove". So, the correct form is "drove".
21) While she was in St. Petersburg, she wrote us letters every week.
The past simple of the verb "be" is "was" and the past simple of the verb "write" is "wrote". So, the correct forms are "was" and "wrote".
22) He came to the table, took a pen, and started writing.
The past simple of the verbs "come", "take", and "start" remain the same. So, the correct forms are "came", "took", and "started".
