Semiconductor Devices Test

Result

Semiconductor Devices Test - 29

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Weekly Quiz Competition

Question 1
4 / -1

Different voltages are applied across a p-n junction and the currents are measured from each value. Which of the following graphs is obtained between voltage and current?

A

B

C

D
Question 2
4 / -1

The relation between the energy E_f of Fermi level, height E_b of potential barrier and work function W_o is

A
E_f = W_o + E_b

B
E_b = W_o – E_f

C
E_b = W_o + E_f

D
W_o = E_b + E_f
Question 3
4 / -1

If the height of potential barrier in a metal is E_b and Fermi energy is E_f, then the minimum energy to remove an electron from the metal will be

A
E_f / E_b

B
E_f × E_b

C
E_f + E_b

D
E_b – E_f
Question 4
4 / -1

In the presence of space charge in the diode valve the plate current is 10 mA at the plate voltage 50 V. Then the plate current at plate voltages 200 V will be

A
20 mA

B
40 mA

C
80 mA

D
none of the above

Solution
Question 5
4 / -1

In a triode valve

A
if the grid voltage is zero then plate current is zero

B
if the temperature of filament is doubled, then the thermionic current will also be doubled

C
if the temperature of filament is doubled, then the thermionic current will nearly be four times

D
at a definite grid voltage the plate current varies with plate voltage according to Ohm’s law
Question 6
4 / -1

The value of plate resistance of a triode is 3 × 10³ Ω and its mutual conductance factor is 1.5 millimho, then its amplification factor will be

A
2 × 10⁶

B
45

C
4.5

D
4 × 10^–5

Solution
Question 7
4 / -1

If the amplification factor of a triode valve is 100, then at plate potential of 250 volt the cut off voltage of its grid will be

A
0 V

B
– 0.4 V

C
– 2.5 V

D
– 150 V

Solution
Question 8
4 / -1

When the plate voltage of a triode is 150 V, its cut off voltage is –5V. On increasing the plate voltage to 200 V, the cut off voltage can be

A
– 4.5 V

B
– 5.0 V

C
– 2.3 V

D
– 6.66 V

Solution
Question 9
4 / -1

In vacuum diode for plate potential is gradually varied from – 200 V to 200 V. How will the plate current vary?

A
First increase then decrease

B
First decrease then increase

C
First remain zero, then continuously increases and may cease to vary at higher potential

D
The variation will be different than that described above
Question 10
4 / -1

At a constant plate potential, if the grid is moved closer to the plate, the amplification factor of triode

A
Decreases

B
Increases

C
Remains unchanged

D
May increase or decrease depending upon grid bias