Semiconductor Devices Test

Result

Semiconductor Devices Test - 65

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Weekly Quiz Competition

Question 1
4 / -1

The amplification produced by a triode is due to the action of

A
Filament

B
Cathode

C
Grid

D
Plate
Question 2
4 / -1

In an experiment, the saturation in the plate current in a diode is observed at 240 V. But a student still wants to increase the plate current. It can be done, if

A
The plate voltage is increased further

B
The plate voltage is decreased

C
The filament current is decreased

D
The filament current is increased
Question 3
4 / -1

In a triode amplifier, the value of maximum gain is equal to

A
Half the amplification factor

B
Amplification factor

C
Twice the amplification factor

D
Infinity

Solution
Question 4
4 / -1

For a given triode µ = 20. The load resistance is 1.5 times the anode resistance. The maximum gain will be

A
16

B
12

C
10

D
None of these

Solution
Question 5
4 / -1

The voltage gain of a triode depends upon

A
Filament voltage

B
Plate voltage

C
Plate resistance

D
Plate current
Question 6
4 / -1

In a triode valve

A
If the grid voltage is zero, then plate current will be 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 Omh's law
Question 7
4 / -1

The amplification factor of a triode valve is 15. If the grid voltage is changed by 0.3 volt the change in plate voltage in order to keep the plate current constant (in volt) is

A
0.02

B
0.002

C
4.5

D
5.0

Solution
Question 8
4 / -1

A
100 kilo-ohms static

B
1000 kilo-ohms static

C
1000 kilo-ohms dynamic

D
1000 kilo-ohms dynamic

Solution
Question 9
4 / -1

A triode has a mutual conductance of 2 × 10^–3 mho and an amplification factor of 50. The anode is connected through a resistance of 25 × 10³ ohms to a 250 volts supply. The voltage gain of this amplifier is

A
50

B
25

C
100

D
12.5

Solution
Question 10
4 / -1

14 × 10¹⁵ electrons reach the anode per second. If the power consumed is 448 milliwatts, then the plate (anode) voltage is

A
150 V

B
200 V

C
14 × 448 V

D
448/14 V

Solution