Valve Electronics Test

Result

Valve Electronics Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The slope of plate characteristic of a vacuum tube diode for certain operating point 10⁻³mA/V. The plate resistance of the diode and its nature respectively

A
100 kilo-ohms static

B
1000 kilo-ohms static

C
1000 kilo-ohms dynamic

D
100 kilo-ohms dynamic

Solution

Given:- The slope of plate characteristic of a vacuum tube diode for certain operating point 10⁻³ mA/V
Question 2
1 / -0

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 25×10³phm to a 250 volts supply. The voltages gain of this amplifier is

A
50

B
25

C
100

D
12.5

Solution
Question 3
1 / -0

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

A
150 V

B
200 V

C
14×448 V

D
448 /14 V

Solution
Question 4
1 / -0

If the amplification factor of a triode (μ) is 22 and its plate resistance is 6600 ohm , then the mutual conductance of this value in mho is

A
1/300

B
25 × 10^-2

C
2.5 × 10^-2

D
0.25 × 10^-2

Solution

Given:-

Amplification factor(μ)=22

Plate resistance = 6600Ω

From the formulae,
Question 5
1 / -0

For a triode at V_g = −1 volt, the following observation were taken V_p= 75V, I_p=2mA, V_p=100 V, I_p=4ma. The value of plate resistance will be

A
25Ω

B
20.8Ω

C
12.5Ω

D
100Ω

Solution
Question 6
1 / -0

The triode constant is out of the following

A
Plate resistance

B
Amplification factor

C
Mutual conductance

D
All the above

Solution

Triode, electron tube consisting of three electrodes—cathode filament, anode plate, and control grid—mounted in an evacuated metal or glass container. It has been used as an amplifier for both audio and radio signals, as an oscillator, and in electronic circuits.
Question 7
1 / -0

The unit of mutual conductance of a triode value is

A
Siemen

B
Ohm

C
Ohm metre

D
Joule columb

Solution

The unit of mutual conductance of a triode value is Siemen.
Question 8
1 / -0

With a change of load resistance of a triode, used as an amplifier, from 50 kilo ohms to 100 kilo ohms its voltage amplification changes from 25 to 30. Plate resistance of the triode is

A
25 kΩ

B
75 kΩ

C
7.5 kΩ

D
2.5 kΩ

Solution

Given:-

Voltage amplification changes from 25 to 30.

On solving equation (i) and (ii), r_p=25 kΩ
Question 9
1 / -0

Select the correct statement from the following:

A
A diode can be used as a rectifier

B
A triode cannot be used as a rectifier

C
The current in a diode is always proportional to the applied voltage

D
The linear portion of the I -V characteristic of a triode is used for amplification without distortion

Solution

Diode allows current to pass only in forward bias.
Question 10
1 / -0

The introduced of a grid in a triode value affects plate current by

A
Making the thermionic emission easier at law temperature

B
Releasing more electrons from the plate

C
By increasing plate voltage

D
By neutralising space charge

Solution

The introduced of a grid in a triode value affects plate current by neutralising space charge.