An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?
(A) fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
(B) fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
(C) fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
(D) fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
The MOSFET switch in its on-state may be considered equivalent to_____________?
(A) resistor
(B) inductor
(C) capacitor
(D) battery
. If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?
(A) 2.3mA
(B) 3.2mA
(C) 4.6 mA
(D) 5.2mA
The signal voltage induced in the aerial of a radio receiver is of the order of_____________?
(A) mV
(B) µV
(C) V
(D) None of the above
In a transmitter ____________oscillator is used?
(A) Hartley
(B) RC phase-shift
(C) Wien-bridge
(D) Crystal
In an AM wave useful power is carrier by ______________?
(A) Carrier
(B) Sidebands
(C) Both sidebands and carrier
(D) None of the above
In an AM wave, the majority of the power is in _____________?
(A) Lower sideband
(B) Upper sideband
(C) Carrier
(D) None of the above
If modulation is 100% then signal amplitude is ____________arrier amplitude?
(A) Equal to
(B) Greater than
(C) Less than
(D) None of the above
In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?
(A) Amplitude
(B) Frequency
(C) Phase
(D) None of the above
In pakistan, ______________ modulation is used for radio transmission?
(A) Frequency
(B) Amplitude
(C) Phase
(D) None of the above