Semiconductor Devices Test

Result

Semiconductor Devices Test - 27

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Weekly Quiz Competition

Question 1
4 / -1

For a transistor amplifier, the voltage gain

A
is high at high and low frequencies and constant in the middle frequency range

B
is low at high and low frequency and constant in the middle frequency range

C
remains constant for all frequencies

D
is high at high frequencies and low at low frequencies and constant in middle frequency range
Question 2
4 / -1

A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

A
It is an n-p-n transistor with R as base

B
It is a p-n-p transistor with R as collector

C
It is a p-n-p transistor with R as emitter

D
It is an n-p-n transistor with R as collector
Question 3
4 / -1

Consider a p-n junction as a capacitor, formed with p and n materials acting as thin metal electrodes and depletion layer width acting as separation between them. Basing on this, assume that a n -p-n transistor, is working as an amplifier in CE configuration. If C₁ and C₂ are the base-emitter and collector-emitter junction capacitances, then

A
C₁ > C₂

B
C₁ < C₂

C
C₁ = C₂

D
C₁ = C₂ = 0
Question 4
4 / -1

Which of the following is correct, about doping in a transistor?

A
Emitter is lightly doped, collector is heavily doped and base is moderately doped

B
Emitter is lightly doped, collector is moderately doped and base is heavily doped

C
Emitter is heavily doped, collector is lightly doped and base is moderately doped

D
Emitter is heavily doped, collector is moderately doped and base is lightly doped
Question 5
4 / -1

The current voltage relation of diode is given by I = (e^1000V/T – 1) mA, where the applied voltage V is in volt and the temperature T is in kelvin. If a student makes an error measuring ± 0.01V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?

A
0.2 mA

B
0.02 mA

C
0.5 mA

D
0.05 mA

Solution
Question 6
4 / -1

Two identical p-n junction are connected in series with battery in three ways. The potential difference across the two p-n junction are equal in

A
circuit 1 and circuit 2

B
circuit 2 and circuit 3

C
circuit 1 and circuit 3

D
circuit 1 only
Question 7
4 / -1

In a p-n junction diode are not connected to any circuit

A
the potential is the same everywhere

B
the p-type side has a higher potential than the n-type side

C
there is an electric field at the junction directed from the n-type side to p-type side

D
there is an electric field at the junction directed from the p-type side to n-type side
Question 8
4 / -1

A p-n junction diode (D) shown in the figure, can act as a rectifier. An alternating current source (V) is connected in the circuit.

A

B

C

D
Question 9
4 / -1

Which of the following statements is not correct when a junction diode is in forward bias?

A
The width of depletion region decreases.

B
Free electrons on n -side will move towards the junction.

C
Holes on p -side move towards the junction.

D
Electron on n -side and holes on p -side will move away from junction.
Question 10
4 / -1

A p-n junction has acceptor impurity concentration of 17 cm^-3 in the P side and donor impurity concentration of 10¹⁶ cm^-3 in the N side. What is the contact potential at the junction? (kT = thermal energy, intrinsic carrier concentration n_i = 1.4 × 10¹⁶ cm^-3 )

A

B

C

D

Solution