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Analog-designs Questions Set 61:

Quiz Mode

The ratio of the mobility to the diffusion coefficient in a semiconductor has the units

V^-1

cm/V^-1

V/cm^-1

V-s

Solution:

The appropriate feedback topology for a transresistance amplifier is _____.

Series-Shunt

Series-Series

Shunt-Series

Shunt-Shunt

Solution:

Which of the following best describes the current gain (Ai) of a common-emitter (CE) amplifier?

Ai is low

Ai is high

Av is high

Av is low

Solution:

What is the condition to prevent thermal runaway in a transistor operating in the active region?

∂Pc / ∂Tj < θ

∂Pc / ∂Tj < 1/θ

∂Pc / ∂θ < 1/Tj

∂Tj / ∂θ < Pc

Solution:

In a UJT relaxation oscillator, if the supply voltage is doubled, the amplitude of the voltage waveform across the capacitor will:

get doubled

reduce to half

not change at all

None of these

Solution:

A forward-biased silicon diode has a potential voltage of 12.4 V and a resistance of 300 Ω connected in series. Calculate the current flowing through the circuit.

52 mA

41.34 mA

40.34 mA

39 mA

Solution:

The output of an amplitude modulator is found to have maximum and minimum amplitudes of 15V and 3V respectively. Calculate the carrier amplitude and signal amplitude.

15V, 3V

8V, 4V

7.92V, 6.7V

9.04V, 5.97V

Solution:

Why is the PN junction of an LED surrounded by a transparent hard epoxy resin shell?

So that the terminals are visible

To protect the LED from breaking

None of the above

To protect the LED from vibrations and shock

Solution:

A low pass filter with a cutoff frequency of 30Hz is cascaded with a high pass filter with a cutoff frequency of 20Hz. The resultant system of filter coils function as

All pass filter

All-stop filter

Band stop filter

Band pass filter

Solution:

In a transistorized series regulator, how is the overload and short-circuit protection provided?

By the use of a thermistor

By using two additional diodes and a current sensing resistor to protect the series transistor

By using a diode along with a capacitor of a small capacitance value in series

By using a diode and an additional resistor to protect the transistor

Analog-designs Questions Set 61:

The ratio of the mobility to the diffusion coefficient in a semiconductor has the units

Solution:

The appropriate feedback topology for a transresistance amplifier is _____.

Solution:

Which of the following best describes the current gain (Ai) of a common-emitter (CE) amplifier?

Solution:

What is the condition to prevent thermal runaway in a transistor operating in the active region?

Solution:

In a UJT relaxation oscillator, if the supply voltage is doubled, the amplitude of the voltage waveform across the capacitor will:

Solution:

A forward-biased silicon diode has a potential voltage of 12.4 V and a resistance of 300 Ω connected in series. Calculate the current flowing through the circuit.

Solution:

The output of an amplitude modulator is found to have maximum and minimum amplitudes of 15V and 3V respectively. Calculate the carrier amplitude and signal amplitude.

Solution:

Why is the PN junction of an LED surrounded by a transparent hard epoxy resin shell?

Solution:

A low pass filter with a cutoff frequency of 30Hz is cascaded with a high pass filter with a cutoff frequency of 20Hz. The resultant system of filter coils function as

Solution:

In a transistorized series regulator, how is the overload and short-circuit protection provided?

Solution:

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