Which inductor is used at high frequencies? Cast iron cored Sheet steel cored Ir

CuriousTab

Correct Answer

Ceramic cored

Explanation

Cast iron, sheet steel and iron alloy have very high hysteresis and eddy current losses at high frequencies.

1. If an amplifier with gain of - 1000 and feedback factor ? = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be
Options
A. 10%
B. 5%
C. 0.2%
D. 0.01%

Correct Answer: 0.2%

Explanation:

As we know, Gain with feedback

A = - 1000, ? = -0.1 .

Correct Answer: conductivity

3. In a Gunn diode oscillator drift velocity of electron is 10⁷ cm/s and active region length is 10 x 10^-4 cm. The natural frequency of oscillation is
Options
A. 1 MHz
B. 10 MHz
C. 1 GHz
D. 10 GHz