Electronics Questions

Zener diode is used for :

A photosensitive metallic surface has work function, hv0. If photons of energy 2hv0 fall on this surface, the electrons come out with a maximum velocity of 4 x 10^6 m/s. When the photon energy is increased to 5hv0, then maximum velocity of photoelectrons will be :

Application of a forward bias to a p-n junction :

The input signal given to a CE amplifier having a voltage gain of $150$ is $V_i=2\cos (15t+\frac{\pi }{3})$. The corresponding output signal will be:

The barrier potential of a p-n junction depends on: (a) type of semiconductor material (b) amount of doping (c) temperature. Which one of the following is correct?

The given graph represents V-I characteristic for a semiconductor device. Which of the following statement is correct?

The output ($X$) of a NAND gate followed by a NOT gate is equivalent to:

In a CE amplifier, the transistor used has transconductance $0.03\text{mho}$. If replaced with another having transconductance $0.02\text{mho}$, the voltage gain $G$ becomes:

In a n-type semiconductor, which of the following is true?

$C$ and $Si$ both have same lattice structure, having $4$ bonding electrons in each. However, $C$ is insulator whereas $Si$ is intrinsic semiconductor. This is because:

Transfer characteristics [output voltage($V_0$) vs input voltage ($V_i$)] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used:

The figure shows a logic circuit with two inputs $A$ and $B$ and the output $C$. The voltage wave forms across $A,B$ and $C$ are as given. The logic circuit gate is:

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is:

In a CE (Common Emitter) transistor amplifier, the audio signal voltage across the collector resistance of $2\text{k}\Omega$ is $2\text{V}$. If the base resistance is $1\text{k}\Omega$ and the current amplification of the transistor is $100$, the input signal voltage is:

To get an output $Y=1$ from the circuit shown below, the input must be ($A,B,C$):

The device that can act as a complete electronic circuit is:

The circuit shown is equivalent to:

The voltage gain of an amplifier with $9\%$ negative feedback is $10$. The voltage gain without feedback will be:

Application of a forward bias to a p-n junction :