Semiconductor Devices Test

Result

Semiconductor Devices Test - 70

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Weekly Quiz Competition

Question 1
4 / -1

Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have

A
X = 0, Y = 1

B
X = 1, Y = 1

C
X = 1, Y = 0

D
X = 0, Y = 0

Solution
Question 2
4 / -1

The combination of gates shown below produces

A
AND gate

B
XOR gate

C
NOR gate

D
NAND gate

Solution
Question 3
4 / -1

The figure shows two NAND gates followed by a NOR gate. The system is equivalent to the following logic gate

A
OR

B
AND

C
NAND

D
None of these

Solution
Question 4
4 / -1

The diagram of a logic circuit is given below. The output F of the circuit is represented by

A

B

C

D

Solution
Question 5
4 / -1

The plate current i_p in a triode valve is given i_p = K(V_p + µV_g)^3/2, where i_p is in milliampere and V_p and V_g are in volt. If r_p =10⁴ ohm and g_m = 5 × 10^–3 mho, then for i_p = 8 mA and V_p = 300 volt, what is the value of K and grid cut off voltage?

A
–6V, (30)_3/2

B
–6V, (1/30)_3/2

C
+ 6V, (30)_3/2

D
+ 6V, (1 /30)_3/2

Solution
Question 6
4 / -1

The linear portions of the characteristic curves of a triode valve give the following readings
The plate resistance is

A
2000 ohms

B
4000 ohms

C
8000 ohms

D
6000 ohms

Solution
Question 7
4 / -1

The relation between dynamic plate resistance (r_p) of a vacuum diode and plate current in the space charge limited region, is

A

B

C

D

Solution
Question 8
4 / -1

An alternating voltage of 141.4 V (rms) is applied to a vacuum diode as shown in the figure. The maximum potential difference across the condenser will be

A
100 V

B
200 V

C
100√2V

D
200√2V

Solution
Question 9
4 / -1

A metallic surface with work function of 2 eV, on heating to a temperature of 800 K gives an emission current of 1 mA. If another metallic surface having the same surface area, same emission constant but work function 4 eV is heated to a temperature of 1600 K, then the emission current will be

A
1 mA

B
2 mA

C
4 mA

D
None of these

Solution
Question 10
4 / -1

A change of 0.8 mA in the anode current of a triode occurs when the anode potential is changed by 10 V. If µ = 8 for the triode, then what change in the grid voltage would be required to produce a change of 4 mA in the anode current

A
6.25 V

B
0.16 V

C
15.2 V

D
None of these

Solution