Bissoy.com
Doctors Medicines MCQs Q&A

A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is best suited for this purpose?

A charger supplies 100 W at 20 V for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency of 200 kHz. Which power device is best suited for this purpose? Correct Answer MOSFET

Explanation:

In this question, it is asked at a switching frequency of as high as 200 kHz, which device will be best suited.

Let's see all the options:-

Thyristor - It has stored charged carrier near its gate-cathode junction. Therefore, for removal of these charge carrier it takes source time. It is not suitable for fast switching.

BJT - It is having law conduction has but high switching loss. Therefore it is not suitable for high switching frequency.

MOSFET & IGBT both devices are suitable for operating at high frequency but compared to MOSFET, IGBT having less suitability at high frequency. Therefore MOSFET is best suited for above mentioned frequency.

Related Questions

The cost price of a mobile charger is ₹ 400 and the selling price of a Bluetooth speaker charger is ₹ 720. The profit earned after selling the mobile charger is 10% and the selling price of mobile charger is 12% less than the cost price of the Bluetooth speaker charger. What is the profit percentage on the Bluetooth speaker Charger?
In the question below are given three statements followed by four conclusions I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: Some computer are phone. No computer is charger. Some charger are typewriter. Conclusions: I. All computer are typewriter. II. All phone are charger. III. Some charger are computer. IV. Some computer are not typewriter.
If “laptop is “charger”, “charger” is “battery”, “battery” is “mobile”, “mobile” is “plug” and “plug” is “bottle” then what is used for calling?
In the following question, four statements are given followed by four conclusions I, II, III and IV. You have to consider the given statements to be true even, if they seem to be at variance with commonly known facts. Read all the conclusions and decide which of the following logically follows from the given statements disregarding the commonly known facts. Statements: Some Mobile are Laptop. Some Tablet are Laptop. Some Desktop are Tablet. No Desktop is Mobile. Conclusions: I. All Tablet being Mobile is a possibility. II. All Laptop being Mobile is a possibility. III. All Desktop are Laptop. IV. All Tablet are Laptop.
You have your laptop directly connected into a router's Ethernet port. Which of the following are among the requirements for the copy flash tftp command to be successful?
1. TFTP server software must be running on the router.
2. TFTP server software must be running on your laptop.
3. The Ethernet cable connecting the laptop directly into the router's Ethernet port must be a straight-through cable.
4. The laptop must be on the same subnet as the router's Ethernet interface.
5. The copy flash tftp command must be supplied the IP address of the laptop.
Given below are four jumbled sentences. Out of the given options pick the one that gives their correct order. A. You’ve probably noticed, with great disappointment, that the battery doesn’t seem to last as long as it did when it was brand new. B. Partial charging is just fine for lithium-ion batteries and can actually have some positive benefits for cell longevity. C. Smartphone users are forever in search of longer battery life, but unfortunately, battery capacity inevitably declines with age. D. However, one thing you can do to prolong the life of your battery and handset is partial charging.
A signal containing only two frequency components (3 kHz and 6 kHz) is sampled at the rate of 8 kHz, and then passed through a low pass filter with a cut-off frequency of 8 kHz. The filter output
If the first two statements are true, the third statement is :
I. Battery X lasts longer than Battery Y.
II. Battery Y doesn't last as long as Battery Z.
III. Battery Z lasts longer than Battery X.
A dealer sold a laptop to P earning a profit of 12%. P used the laptop for many years, spent Rs. 2384 on its repair and sold it for Rs. 11000 to Q. Q further spent Rs. 8800 on its repair and sold it to the same dealer earning a profit of 5%. If the price at which the dealer bought the laptop from Q is 30% of the price at which he initially bought the laptop, then find the loss percentage of P. 
In an AM system receiver. the mixer translates the carrier frequency fc to a fixed intermediate frequency of 450 kHz. Given a broadcast signal of frequency 900 kHz. What is the corresponding image frequency when a superhetrodyne receiver is employed with local oscillator frequency greater than the broadcast signal frequency?