Semiconductor Devices Test

Result

Semiconductor Devices Test - 64

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Weekly Quiz Competition

Question 1
4 / -1

Truth table for system of four NAND gates as shown in a figure is

A

B

C

D

Solution
Question 2
4 / -1

Number of secondary electrons emitted per number of primary electrons depends on

A
Material of target

B
Frequency of primary electrons

C
Intensity

D
None of the above

Solution
Question 3
4 / -1

Due to S.C.R in vacuum tube

A
I_p → Decrease

B
I_p – Increase

C
V_p = Increase

D
_g = Increase
Question 4
4 / -1

The grid voltage of any triode valve is changed from –1 volt to –3 volt and the mutual conductance is 3 × 10^–4 mho. The change in plate circuit current will be

A
0.8 mA

B
0.6 mA

C
0.4 mA

D
1 mA

Solution
Question 5
4 / -1

In an amplifier the load resistance RM_L is equal to the plate resistance (r_p). The voltage amplification is equal to

A
µ

B
2 µ

C

D

Solution
Question 6
4 / -1

For a given plate-voltage, the plate current in a triode is maximum when the potential of

A
The grid is positive and plate is negative

B
The grid is positive and plate is positive

C
The grid is zero and plate is positive

D
The grid is negative and plate is positive

Solution
Question 7
4 / -1

If R_p = 7KΩ , gm = 2.5 milli mho, then on increasing plate voltage by 50 V, how much the grid voltage is changed so that plate current remains the same

A
–2.86 V

B
–4 V

C
+ 4 V

D
+ 2 V

Solution
Question 8
4 / -1

In a triode amplifier, µ = 25, r_p = 40 kilo ohm and load resistance R_L = 10 kilo ohm. If the input signal voltage is 0.5 volt, then output signal voltage will be

A
1.25 volt

B
5 volt

C
2.5 volt

D
10 volt

Solution
Question 9
4 / -1

The plate resistance of a triode is 2.5 × 10⁴ Ω and mutual conductance is 2 × 10^–3 mho. What will be the value of amplification factor

A
50

B
75

C
1.25 × 10⁷

D
2.25 × 10⁷

Solution
Question 10
4 / -1

In a diode valve the cathode temperature must be (ϕ = work function)

A
High and ϕ should be high

B
High and ϕ should be low

C
Low and ϕ should be high

D
Low and ϕ should be low