The given circuit
The equivalent circuit for given conditions can be redrawn as
Diode D₁ becomes forward biased due to short circuit and D₂ becomes reverse biased due to open circuit which makes I = OmA.
Hence alternative (A) is the correct choice.

Correct Option: A

The given circuit
The equivalent circuit for given conditions can be redrawn as
Diode D₁ becomes forward biased due to short circuit and D₂ becomes reverse biased due to open circuit which makes I = OmA.
Hence alternative (A) is the correct choice.

The given circuit
From the given circuit, we conclude that diode D₂ remains ‘ON’. Now, if we assume diode D₁ is ‘ON’ then the above circuit can be modified as
It makes the voltage between terminal A & B equals to OV., which is not possible because it violates the Kirchoff’s law. Therefore the current in diode D₁ is OmA.
Hence alternative (C) is the correct choice.

Correct Option: C

The given circuit
From the given circuit, we conclude that diode D₂ remains ‘ON’. Now, if we assume diode D₁ is ‘ON’ then the above circuit can be modified as
It makes the voltage between terminal A & B equals to OV., which is not possible because it violates the Kirchoff’s law. Therefore the current in diode D₁ is OmA.
Hence alternative (C) is the correct choice.

Two p-n junction diodes are connected back to back cannot be used as a transistor due to large base width. Although, it is said that a transistor is a device in which two pn-junctions diodes are connected back-to-back. But it does not mean that two discrete diodes connected back-to-back can work as a transistor. In this case, each diode has two equally doped regions, so that the overall circuit has four equally doped regions. Given below shows the arrangement of two diodes
connected back-to-back. This would not work because in this case base is wide and equally doped whereas in actual transistor base is very thin and lightly doped.
In n-p-n transistor, the free electrons passing through the base to the collector have a short life time. As long as base thin, the free electrons can reach the collector. But is case two discrete back-to-back diodes, there are four doped region instead of three. Hence two diodes connected back-to-back can never work as a transistor.

Correct Option: C

Two p-n junction diodes are connected back to back cannot be used as a transistor due to large base width. Although, it is said that a transistor is a device in which two pn-junctions diodes are connected back-to-back. But it does not mean that two discrete diodes connected back-to-back can work as a transistor. In this case, each diode has two equally doped regions, so that the overall circuit has four equally doped regions. Given below shows the arrangement of two diodes
connected back-to-back. This would not work because in this case base is wide and equally doped whereas in actual transistor base is very thin and lightly doped.
In n-p-n transistor, the free electrons passing through the base to the collector have a short life time. As long as base thin, the free electrons can reach the collector. But is case two discrete back-to-back diodes, there are four doped region instead of three. Hence two diodes connected back-to-back can never work as a transistor.

External pass resistor is also called current limiting resistor .
External pass resistor for increasing the current that regulator can handle.

Correct Option: B

External pass resistor is also called current limiting resistor .
External pass resistor for increasing the current that regulator can handle.

We know that

I'0 = I0 2		Tf – Ti
		2

32I0 = I0 2		Tf – 40
		10

or 32 = 2		Tf – 40
		10

or 25 = 2		Tf – 40
		10

Correct Option: A

We know that

I'0 = I0 2		Tf – Ti
		2

32I0 = I0 2		Tf – 40
		10

or 32 = 2		Tf – 40
		10

or 25 = 2		Tf – 40
		10