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In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance $0.03 \text{ mho}$ and current gain 25. If the above transistor is replaced with another one with transconductance of $0.02 \text{ mho}$ and current gain of 20, the voltage gain will be:
The output (X) of the logic circuit shown in the figure will be:
In an n-type semiconductor, which of the following statement is true?
Transfer characteristics [output voltage ($V_o$) vs input voltage ($V_i$)] for a base biased transistor in CE configurations are as shown in the figure. For using the transistor as a switch, it is used:
The symbolic representation of four gates is shown as: Pick out which ones are for AND, NAND, and NOT gates, respectively.
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
To get an output $Y = 1$ from the circuit shown below, the input must be:
A transistor is operated in a common emitter configuration at constant collector voltage $V_c = 1.5 \text{ V}$ such that a change in the base current from $100 \text{ } \mu\text{A}$ to $150 \text{ } \mu\text{A}$ produces a change in the collector current from $5 \text{ mA}$ to $10 \text{ mA}$. The current gain ($\beta$) is:
The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C are as shown below. The logic circuit gate is:
Which of the following is an example of forward biasing?
For transistor action, which of the following statements is correct?
A logic circuit provides the output $Y$ as per the following truth table: $A \quad B \quad Y$ $0 \quad 0 \quad 1$ $0 \quad 1 \quad 0$ $1 \quad 0 \quad 1$ $1 \quad 1 \quad 0$ The expression for the output $Y$ is:
In a series LCR circuit, the inductance $L$ is 10 mH, capacitance $C$ is 1 $\mu$F and resistance $R$ is 100 $\Omega$. The frequency at which resonance occurs is
A thin rod of length $L$ and mass $M$ is bent at its midpoint into two halves so that the angle between them is $90^{\circ}$. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is:
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
The reaction can be classified as:
Which of the following statements are correct? (a) Centre of mass of a body always coincides with the centre of gravity of the body. (b) Centre of gravity of a body is the point about which the total gravitational torque on the body is zero. (c) A couple on a body produces both translational and rotational motion in a body. (d) Mechanical advantage greater than one means that small effort can be used to lift a large load.
A couple produces:
The temperature of a gas is $-50^{\circ}$C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?
The reaction of $\text{C}_6\text{H}_5\text{CH=CHCH}_3$ with $\text{HBr}$ produces: