# A permanent transition between two states can be described by the relation

1.  E1-E2=-1/2hν

2.  E1-E2=1/2hν

3.  E1-E2=+-hν

4.  none

5.  12

6.  16

7.  24

8.  48

8

48

Explanation :
No Explanation available for this question

# A network is composed of two sub-networks N1 and N2 as shown in figure. If the sub-network N1 contains only linear, bi lateral, time-invariant elements then it can be replaced by its The venin’s equivalent even if sub-network N2 contains

1.  A two-terminal element which is non-linear

2.  A non-linear inductance mutually coupled to an element in N1

3.  An element which is linear but mutually coupled to some element in N1

4.  A dependent source whose value depends on voltage in N1

5.  4

6.  6

7.  12

8.  18

8

12

Explanation :
No Explanation available for this question

# An example of a hetero junction diode is

1.  Zener diode

2.  LED

3.  Injection laser

4.  Both (B)& (C)

5.  225

6.  215

7.  220

8.  235

8

225

Explanation :
No Explanation available for this question

# Under what condition maximum power is transferred from an ac source to a variable load

1.  The load impedance must also be inductive

2.  Sum of source and load impedance is zero

3.  Sum of source reactance and load reactance is zero

4.  None of these

5.  22

6.  36

7.  28

8.  None of these

8

None of these

Explanation :
No Explanation available for this question

# In a step graded junction semiconductor

1.  Impurity density is constant up to the junction

2.  varies linearly with distance

3.  varies with square of distance

4.  None of these

4

Impurity density is constant up to the junction

Explanation :
No Explanation available for this question

# Zener breakdown

1.  Is a cumulative process like avalanche breakdown

2.  Occurs at higher voltage compared to avalanche breakdown

3.  Occurs at lesser voltage compared to avalanche breakdown

4.  Both (A) and (C)

5.  9000

6.  9400

7.  9600

8.  9800

8

9600

Explanation :
No Explanation available for this question

# Fill factor is the realizable power factor of

1.  Laser

2.  LED

3.  P-I-N diode

4.  solar cell

4

solar cell

Explanation :
No Explanation available for this question

# An Avalanche photo diode works on

1.  High forward Bias

2.  High Forward Bias and Impact ionization

3.  High reverse Bias

4.  All of these

5.  4

6.  5

7.  6

8.  8

8

4

Explanation :
No Explanation available for this question

# For the network shown in the figure, if Vs=1 V and V=0 then I=5A and if Vs=0 and V1=1 then I=1/2 A. The value of 1sc and R1 of the Norton equivalent across AB would be respectively

1.  -5A & 2

2.  10A & 0.5

3.  5A & 2

4.  2.5A & 5

5.  1

6.  2

7.  3

8.  4

8

2

Explanation :
No Explanation available for this question

1.  60

2.  80

3.  100

4.  ∞

4