In phase response of a recorder noise level ___________ with the band width of a system
A). Increases
B). Decreases
C). Reaches unity
D). Reaches infinity
Power gain in decibels is equal to voltage gain in decibels only when
A). Input impedance is equal to output impedance
B). Output impedance is zero
C). Never
D). Input impedance is zero
Selenium is _____ semiconductor.
A). Extrnisic
B). Intmisic
C). N-type
D). P-type
_______ is a hard solder.
A). Tin-lead
B). Tin-silver-lead
C). Copper-zinc
D). None of the above
The resistivity of a metal is a function of temperature because
A). The amplitude of vibration of the atoms varies with temperature
B). The electron density varies with temperature
C). The electron gas density varies with temperature
D). None of the above