MH SET 2019 Paper 2 Electronics Science Question Paper (23-Jun-2019)

Question 1

Which of the following compounds is not suitable for Light Emitting Diodes (LEDs) ?

Accepted Answer

SiCa

Answer

GaN

Answer

GaP

Answer

GaAs

Question 2

The distribution coefficient $K_d$ is given by$K_d = \frac{C_S}{C_L}$where $C_S$ = Concentration of impurity in the solid$C_L$ = Concentration in the liquidWhich of the following is not a function of $K_d$ ?

Accepted Answer

The orientation of the material

Answer

Growth rate

Answer

The impurity concentration

Answer

The temperature of the solid-liquid interface

Question 3

Ebers-Moll model of BJT has two coupled back to back diodes in parallel with controlled current sources.Which of the following is/are correct for switching applications ?(1) If two diodes are both in forward bias, then the BJT is in a low impedance state.(2) If two diodes are both in reverse bias, then BJT is in a high impedance state.(3) If two diodes are both in forward bias, then the BJT is in high impedance state.(4) If two diodes are both in reverse bias, then BJT is in low impedance state.

Accepted Answer

1 and 2

Answer

2 and 4

Answer

1, 2 and 3

Answer

2, 3 and 4

Question 4

The technique of growing an oriented single crystal layer on a substrate wafer is called :

Accepted Answer

Epitaxy

Answer

Oxidation

Answer

Ion-implantation

Answer

Diffusion

Question 5

Determine the values of current amplification factor $(\beta)$ of two different transistors having $\alpha_1 = 0.99$ and $\alpha_2 = 0.98$ :

Accepted Answer

99 and 49 respectively

Answer

99 and 98 respectively

Answer

49 and 99 respectively

Answer

98 and 99 respectively

MH SET 2019 Paper 2 Electronics Science Question Paper (23-Jun-2019)

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