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bridge rectifier
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Full wave bridge rectifier is used in mobile chqrger.
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Description : wireless mobile charger

Answer : it is simply the wireless transfer of the electricity such in transformer the EMF is induced in the neighbouring called because of change in the voltage in primary coil show the phenomenon of mutual inductance is at a very high level and energy can transfer in through the air or another medium

Description : Why does the charger become hot while charging mobile phone?

Answer : Charging depends on time duration. If your phone battery is very low and you are using your phone with battery draining app like YouTube, the charger will be forced by the phone to ... temp of electrical components like transistors. Junction temperature will be larger as junction current is higher.

Description : Draw the circuit diagram of battery charger using SCR and explain it’s working.

Answer : Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.

Description :

Answer : Rectifier is use in power supply to convert Alternating current (AC) to Direct Current (DC) .

Description : Define the following terms : (i) Base Station (ii) Control Channel (iii) Mobile Station (iv) Page 

Answer : i) Base Station: - A fixed station in a mobile radio system used for radio communication with mobile stations. Base stations are located at the center or on the edge of a coverage region ... the page throughout the service area using base stations which broadcast the page on a radio carrier.

Description :

Answer : the efficiency of centre tapped full wave rectifier and bridge rectifier is same that is 80.2% but the because of the use of Central trap the Transformer utilisation factor It's become low.hence we can say the bridge rectifier is more efficient

Description : Single-phase mid-point controlled rectifier with RL load

Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.

Description : Single-phase Midpoint controlled rectifier with Resistive load

Answer : Single-phase Midpoint controlled rectifier with Resistive load:  1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.

Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2

Description :

Answer : rectifier is a device which converts AC voltage to pulsating DC voltage using one or more diode diode conducts only in unit direction that is forward bias condition practically it does not conduct ... types one is with using two diodes and Centre tap Transformer and another is bridge wave rectifier

Description :

Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.

Description :

Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

Description :

Answer : Ac to dc

Description : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

Answer : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

Description : List out advantages and disadvantages of bridge rectifier.

Answer : Advantages :  1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded.  2. The need of center-tapped transformer is eliminated.  ... The value of the diodes used should be precise , else there will be an error in rectification

Description : Define PIV, TUF, ripple factor, efficiency of rectifier.

Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac

Description : operation of half wave rectifier type AC Voltmeter.

Answer :  Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce 

Description : need of rectifier and filter. 

Answer : Need of rectifier: Every electronics circuit needs a D.C. power source for its operation. The rectifier circuit is used to convert A.C. supply to unidirectional pulses .  Need of filter: A filter ... only the D.C. components to reach the load. So filter is used to provide ripple free output.

Description : Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.

Answer : 1. In positive half cycle (0 to Π): The end A of the secondary winding becomes positive and end B negative. This makes diode D1 and D4 forward biased while diode D2 and D3 are reverse biased. These two diodes will ... D2 and D3 when it is conducting is as follows.  B - D2 - RL - D3 - A 

Description :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Answer :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Description :

Answer : The rectifier instrument is not free from frequency error.

Description :

Answer : The scale of a rectifier instrument is linear.

Description :

Answer : Rectifier is a device which convert AC to DC.

Description : In a full wave rectifier the negative point in a circuit is   (A) cathode (B) anode (C) The central tap on the high voltage secondary (D) plate.

Answer : In a full wave rectifier the negative point in a circuit is The central tap on the high voltage secondary 

Description : In a 3-phase half-wave rectifier, if per phase input is 200 V, then the average output voltage is   (a) 233.91 V (b) 116.95V (c) 202.56 V (d) 101.28V 

Answer : a

Description :  What are the important parts of the mobile device which used in Digital forensic? A. SIM B. RAM C. ROM. D.EMMC chip

Answer : D.EMMC chip 

Description : The input frequency of a bridge rectifier is 50 its output frequency will be  1. 25 Hz 2.50 Hz 3.75 Hz 4. 100 Hz

Answer : The input frequency of a bridge rectifier is 50 its output frequency will be 100 Hz

Description : Can we use a zener diode as a rectifier?

Answer : Yes we can use zener diode as rectifier but it have limitations better to use normal diode. Zener diode have some different applications.

Description : Which of the following operating system is used on mobile phones? (A) Windows Vista (B) Android (C) Windows XP (D) All of the above

Answer : (B) Android

Description : In a typical mobile phone system with hexagonal cells, it is forbidden to reuse a frequency band in adjacent cells. If 840 frequencies are available, how many can be used in a given cell? (A) 280 (B) 210 (C) 140 (D) 120

Answer : Answer: A Explanation: Each cell has six other adjacent cells, in a hexagonal grid. If the central cell uses frequency group A, its six adjacent cells can use B, C, B, C, B, and C respectively. In other words, only 3 unique cells are needed. So the answer is 840/3 = 280 frequencies.

Description : How power supply is done to RPi? A. USB connection B. Internal battery C. Charger D. Adapter

Answer : A. USB connection 

Description : Which of the following circuit is used as 'Memory device' in computers ? (1) Rectifier (2) Flip-Flop (3) Comparator (4) Attenuator

Answer : Flip-Flop

Description : Name the circuit used in rectifier to minimize ripple. List the types of this circuit with simple circuit diagram.

Answer : Rectifier filter is an electronic circuit that removes ripple or unwanted AC signal components from the output of a Rectifier. Types - (a) Series Inductor filter (d) Shunt capacitor filter (b) L-C type filter (e) Π - type filter

Description : Positive feedback is used in 1. Amplifier 2. Rectifier 3.Oscillator 4. Detector 

Answer : Positive feedback is used in 1. Amplifier 2. Rectifier 3.Oscillator 4. Detector 

Description : Which was the first company to launch mobile phone services in India? (A) Essar (B) BPL (C) Hutchison (D) Airtel 

Answer : (D) Airtel

Description : 1. Which animal belongs to the family in which Panda belongs? 2. English is the official language of which State? 3. The ratio of the inertial mass to gravitational mass is equal to which number? 4. Which was India’s first mobile offshore drilling platform? 5. Where has the use of plough been evidenced? 6. Who first imparted a mass character to the Indian National Congress? 7. Which President of-India served for two terms? 8. Which part of cockroach bears exo and endoskeleton? 9. Which region receives the rainfall throughout the year due to westerly winds? 10. Which was initially the most powerful city state of Indian in the 6th century B. C. ? 11. Under which Article of the Constitution is the President’s rule promulgated on any State in India? 12. What is the most abundant element on the earth’s crust by weight? 13. Why does the Issue Department of the RBI maintain a against printing of note? 14. Which winds are predominantly seasonal winds? 15. Upto where Chandraqupta Maurya's empire extended in the north-west? 16. The theory of use and disuse was used to explain evolution by which scientist? 17. By when is extinction of a species in a food chain compensated? 18. For howmany month can the proclamation of emergency at the first instance be restricted? 19. Which state is the largest producer of Gypsum? 20. By whom were The Chalukyas of Badami were succeeded?

Answer : Answer : 1 1. Bear 2. Nagaland 3. 1 4. Sagar Samrat 5. Kalibangan 6. Mahatma Gandhi 7. Rajendra Prasad 8. Head 9. South Chile 10. Magadh 11. 356 12. Oxygen 13. Minimum Reserve System 14. Monsoon winds 15. Hindukush 16. Lamarck 17. Food web 18. 6 months 19. Rajasthan 20. Rashtrakutas

Description : From the national point of view, which of the following indicates micro approach? (1) Study of sales of mobile phones by BSNL (2) Unemployement among Women (3) Per capita income in India (4) Inflation in India

Answer : Study of sales of mobile phones by BSNL

Description : What is the name of the device used to convert alternating current into direct current ? (1) Ammeter (2) Galvanometer (3) Rectifier (4) Transformer

Answer : Rectifier

Description : The device used to change the speed of an electric fan is (1) Amplifier (2) Regulator (3) Switch (4) Rectifier

Answer : Regulator

Description : Which of the following is/are true w.r.t. applications of mobile computing? (A) Travelling of salesman (B) Location awareness services (1) (A) true; (B) false (2) Both (A) and (B) are true. (3) Both (A) and (B) are false. (4) (A) false; (B) true.

Answer : Answer: 2

Description : Which of the following mobile telephone network is not based on GSM technology ? (1) Idea (2) BPL Mobile (3) Airtel (4) Reliance Infocomm

Answer : Reliance Infocomm

Description : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer : Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Description : Which circuit is used as amplitude comparator?

Answer : Schmitt trigger circuit is used as amplitude comparator.

Description : The basis of the technique of chromatography for separating components of a mixture is? A. the differing movement of particles of different mass in an electrical field B. the interaction of the components with a stationary and a mobile phases C. the absorption of infrared radiation by the components. D. the deflection of charged particles in a magnetic field. 

Answer : the interaction of the components with a stationary and a mobile phases

Description : Develop a dialogue between a teacher and student who is apologising for using mobile phone in the class. (8-10 dialogues). 

Answer : Ans: Teacher : Sumeet! What are you doing? Sumeet : Nothing sir. Teacher : Then what is there in your hands? Sumeet : Sorry sir, I was just checking the message on my phone. Teacher: This is too ... I will take care of it. Teacher : Okay. Now pay attention to the study. Sumeet : Okay sir. 

Description : Preethi owns lenova mobile in a showroom. she labelled the price of mobile to earn a profit of 20% on the cost price. she sold the mobile by offering a discount of 10% on the labelled price. What is the actual percent profit earned?

Answer : Let the CP of mobile= Rs 100 Then the labeled price= Rs.120 SP= Rs. 120-10%of 120 = RS120-12= Rs 108 Gain= Rs 108- Rs 100 = Rs 8 Gain%= 8/100*100=8%

Description : Explain handoff procedure in mobile communication.

Answer : Assume that there is a call going on between two parties over a voice channel. When the mobile unit moves out of coverage area of a particular cell site the reception becomes weak. Then the cell ... arranges the handoff requests in a queue instead of rejecting them, if the new cell sites are busy.

Description : How much time we should use mobile in a day ?

Description : ______ consists of communication protocols for electronic devices, typically a mobile device and a standard device. A. RFID B. MQTT C. NFC D. None of above

Answer : C. NFC 

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