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1735.

A series RLC circuit, consisting of R = 10 ohms, X_L = 20 ohms and X_c = 20 ohms is connected across an ac supply of 100 V (rms). The magnitude and phase angle (with reference to supply voltage) of the voltage across the inductive coil are respectively
a. 100 V; 90°
b. 100 V; -90°
c. 200 V; – 90°
d. 200 V; 90°

asked in Electrical Paper-1, 1997

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1736.

GaAsLEDs emit radiation in the
a. Ultra-violet region
b. Violet-blue-green range of the visible region
c. Visible region
d. Infra-red region

asked in Electrical Paper-1, 1997

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1737.

Silicon carbide reinforced aluminum metal matrix- composites find application in
a. The manufacture of transformer cores
b. The manufacture of cutting tools.
c. The manufacture of standard resistors
d. Aerospace industry

asked in Electrical Paper-1, 1997

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1738.

Consider the following statements:
In a semiconductor, the measurement of Hall coefficient provides quantitative information on
1. Density of carriers.
2. Polarity of carriers.
3. Effective mass of the carriers.
4. Mobility of the carriers.
Of these statements
a. 1 and 2 are correct
b. 2 and 3 are correct
c. 1 and 3 are correct
d. 1, 2, 3 and 4 are correct

asked in Electrical Paper-1, 1997

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1739.

Consider the following statements:
Pure germanium and pure silicon are examples of
1. Direct band-gap semiconductors.
2. Indirect band-gap semiconductors.
3. Degenerate semiconductors.
Of these statements
a. 1 alone is correct
b. 2 alone is correct
c. 3 alone is correct
d. 1 and 3 are correct

asked in Electrical Paper-1, 1997

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1740.

Two initially identical samples A and B of pure germanium are doped with donors to concentrations of 1 × 10²⁰m^-3 and 3 ×l0²⁰ m^-3 respectively. If the hole concentration in A is 9 ×10¹² m^-3, then the hole concentration in B at the same temperature will be
a. 3×10¹² m^-3
b. 7×10¹² m^-3
c. 11×10¹² m^-3
d. 27×10¹² m^-3

asked in Electrical Paper-1, 1997

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