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PHY301 Current Final Term Papers Fall 2010 (11~26 Feb 2011)

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My to day Phy301 12-02-2011 paper
Attachments:

Every fellow is requested to do not believe in these marked answers, because I am also not good student I found all answer from groups. But all questions are noted from my own attempt paper of PHY301     

Total time: 2 hours

Total marks: 75

Marks division: 25 marks [5+5+5+5+5]

                                    12 marks [3+3+3+3]

                                    8 marks: [2+2+2+2]

                                    30 marks [30 MCQS’ of 1 marks]

Paper is lengthy and you are also make or draw a diagram of circuit where asked. Answers’ should be to the point.

 

 

Leakage current of semiconductor diode is caused by                                [marks1]

       ► chemical energy

       ► heat energy

       ► barrier voltage

       ► doping impurity

 

Using superposition theorem, for a circuit containing independent sources, any remaining voltage  source is                                                                           [marks1]

       ► remain same

       ► made zero by replacing them by open  circuit

       ► made zero by replacing them by capacitor

       ► made zero by replacing them by short circuit

 

The primary function of a filter is to                                                             [marks1]

       ► Minimize ac input variations

       ► Suppress odd harmonics in the rectifier output

       ► Stabilize dc level of the output voltage

       ► Remove ripples from the rectified output

 

The ripple factor of a bridge rectifier                                                           [marks1]

       ► 1.21

       ► 0.406

       ► 0.812

       ► 1.11

 

Avalanche breakdown is primarily dependent on the phenomenon of        [marks1]

       ► Collision

       ► Doping

       ► Ionization

       ► Recombination

 

 

 

 

 

 

The value of Ia for given circuit is                                                                [marks1]

 

       ► Ia=Io

       ► Ia= 3A

       ► Ia= -3A

       ► Ia=6v

 

When a diode is reversed biased                                                                  [marks1]

      ► It will act as short circuit

      ► It will act as an open circuit

      ► It will act as close circuit

      ► maximum current flows

 

In a reverse biased PN-junction, which current carriers cause leakage current? [marks1]

4 options were given and correct answer was Doping current 

Note: I am not sure because I do not know answer, I got this answer on some group]                               

This circuit has been asked for the voltage drop at 4 ohms.                       [marks 2]

 

 

 

 

 

 

 

Hint, it is not answer: Circuit is in parallel connection and in parallel connection the voltage drop each resistance is same.

Series circuit: current same

Parallel circuit: voltage same

 

What would be the current across the load?                                                [marks3]

 

 

 

Keeping in mind Norton's Theorem find Norton’s Resistance RN. Do not draw the circuit.write each step of calculation.                                                     [Marks5]

 

 

 

 

 

 

Find Ix  by  Norton's Theorem if Norton’s Resistance RN is 5kW

 and Norton’s current INor.is 6mA , draw the Norton's equivalent circuit.[marks5]

 

 

 

What is rectification and amplification, and what devices use rectification and amplification?                                                                                        [marks5]

 

 

 

See page no. 125 in handouts there is an example of thevenin theorem. First example of thevenin’s theorem asked in today paper also.                                         [marks5]

Only two steps: to find Vth.

 

 

Attachments:

Addition of impurities in semiconductor material to produce more current is called

► dopping

► bonding

► excitation

► intrinsic

 

 

 

Question No: 5 ( Marks: 1 ) - Please choose one

For a P-N junction under farward bias

► more farward current flows

► no farward current flows

► more reverse current flows

► infinite reverse current flows

 

 

Question No: 6 ( Marks: 1 ) - Please choose one

A diode is a

► one way conductor

► two way conductor

► three way conductor

► insulator

 

Using superposition theorem, for a circuit containing independent sources, any remaining

current source is

► replaced by capacitor

► replaced by short circuit

► made zero by replacing them by open circuit

► replaced by close circuit

 

 

The base region of a p-n-p transistor is

► Very thin and heavily doped with holes

► Very thin and heavily doped with electrons

► Very thin and lightly doped with holes

► Very thin and lightly doped with electrons

 

 

Voltage multipliers are usually used in low current high voltage applications e.g

► Stabilizer of refrigerator

► Microcontroller

► Cathode ray tube in television

► Remote control

 

 

Question No: 24 ( Marks: 3 )

Crude logic gates circuits may be constructed out of nothing but diodes and resistors.

Take for example this logic gate circuit:

 

Identify what type of logic function is represented by this gate circuit

This is an OR gate circuit.

 

 

Question No: 26 ( Marks: 5 )

Keeping in mind the Source transformation method, how we will convert 10v voltage

source into current source

 

 

 

 

Question No: 27 ( Marks: 5 )

Did the power remain same or not, in either case provide a proof?

 

 

 

Question No: 28 ( Marks: 5 )

Calculate I1, I2 and I3 values.

 circuit bikul same nahi tha resistance ki jaga chage thi or current source ki bi or 3mA ki jaga per 4mA tha or jaha is waqat 3mA ha wahan 3kohm resister tha or resister ki jaga per current source tha value thi 4mA.

 

Solution:

I1=2mA….Ans

I2=-3mA….Ans

KVL for loop 3

2kI3 + 2k(I3 + I2) = 8

2kI3 + 2kI3+ 2kI2= 8

4kI3 – 8 =8

4kI3= 16

I3=4mA….Ans

 

 

 

5) In PNP transistor, the P-regions are

a) Base and emitter

b) Base and collector

c) emitter and collector

d) All of the above

 

 

 

 

The output of a half wave rectifier is suitable only for ..........

► Running car diodes

► Charging batteries

► Diode rating

► Purity of power output

 

 

 

 

While calculating Rth in tevnes theroum  current sources in the circuit are

► Replaced by opens

► Replaced indirect voltage

► Replaced by short

► Replaced DC voltage

 

Question No: 6    ( Marks: 1 )    - Please choose one

 A diode is a

       ► one way conductor

 

       ► two way conductor

       ► three way conductor

       ► insulator

 

 

Question No: 12    ( Marks: 1 )    - Please choose one

 Using superposition theorem, for a circuit containing independent sources, any remaining current source is

       ► replaced by capacitor

       ► replaced by short circuit

       ► made zero by replacing them by open circuit

       ► replaced by close circuit

 

 

Question No: 15    ( Marks: 1 )    - Please choose one

 The base region of a p-n-p transistor is

 

 

       ► Very thin and heavily doped with holes

       ► Very thin and heavily doped with electrons

       ► Very thin and lightly doped with holes

       ► Very thin and lightly doped with electrons

 

 

Define KIRCHHOFF’S VOLTAGE LAW (KVL):

 

Kirchhoff's Voltage Law (or Kirchhoff's Loop Rule) is a result of the electrostatic field being conservative. It states that “the total voltage around a closed loop must be zero”. If this were not the case, then when we travel around a closed loop, the voltages would be indefinite. So,

 

 

 

 

 

 

 

 

 

 

 

 

Attachments:

Nice brother

 

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