AIEEE 2005 | Semiconductor Question 211 | Physics

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $$2480$$ $$nm$$ is incident on it. The band gap in $$(eV)$$ for the semiconductor is

$$2.5$$ $$eV$$

$$1.1$$ $$eV$$

$$0.7$$ $$eV$$

$$0.5$$ $$eV$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

In a full wave rectifier circuit operating from $$50$$ $$Hz$$ mains frequency, the fundamental frequency in the ripple would be

$$25$$ $$Hz$$

$$50$$ $$Hz$$

$$70.7$$ $$Hz$$

$$100$$ $$Hz$$

AIEEE 2005

MCQ (Single Correct Answer)

-1

Out of Syllabus

In a common base amplifier, the phase difference between the input signal voltage and output voltage is

$$\pi $$

$${\pi \over 4}$$

$${\pi \over 2}$$

$$0$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

Out of Syllabus

For a transistor amplifier in common emitter configuration for load impedance of $$1k\,\Omega $$ $$\left( {{h_{fe}} = 50} \right.$$ and $$\left. {{h_{oe}} = 25} \right)$$ the current gain is

$$-24.8$$

$$-15.7$$

$$-5.2$$

$$-48.78$$

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