Semiconductor Devices Test

Result

Semiconductor Devices Test - 66

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Weekly Quiz Competition

Question 1
4 / -1

In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from 200 volt to 220 volt and the grid potential is decreased from –0.5 volt to –1.3 volt. The amplification factor of this valve is

A
15

B
20

C
25

D
35

Solution
Question 2
4 / -1

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

A

B
25 × 10^–2

C
2.5 × 10^–2

D
0.25 × 10^–2

Solution
Question 3
4 / -1

The correct relation for a triode is

A

B

C
Both (a) and (b)

D
None of these
Question 4
4 / -1

The triode constant is out of the following

A
Plate resistance

B
Amplification factor

C
Mutual conductance

D
All of these
Question 5
4 / -1

The unit of mutual conductance of a triode valve is

A
Siemen

B
Ohm

C
Ohm metre

D
Joule coulomb^–1
Question 6
4 / -1

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 k Ω

B
75 k Ω

C
7.5 k Ω

D
2.5 k Ω

Solution
Question 7
4 / -1

The plate current in a vacuum diode depends on

A
Cathode temperature only

B
Plate voltage only

C
Both plate voltage and cathode temperature

D
None of the above
Question 8
4 / -1

The introduction of a grid in a triode valve affects plate current by

A
Making the thermionic emission easier at low temperature

B
Releasing more electrons from the plate

C
Increasing plate voltage

D
Neutralizing space charge
Question 9
4 / -1

The value of plate current in the given circuit diagram will be

A
3 mA

B
8 mA

C
13 mA

D
18 mA

Solution
Question 10
4 / -1

Coating of strontium oxide on tungsten cathode in a valve is good for thermionic emission because

A
Work function decreases

B
Work function increases

C
Conductivity of cathode increases

D
Cathode can be heated to high temperature