M

Mr. Dubey • 52.30K Points
Coach 

Q. Gain of power amplifiers                      with increase in operating frequency.

(A) increases
(B) decreases
(C) increases exponentially
(D) decreases exponentially
Correct : Option (B)

Explanation: 
 silicon bipolar junction transistor amplifiers in the cellular telephone band of 800-900 mhz band have power added efficiencies of about 80%. but this efficiency drops quickly with increase in the operating frequency.

Share

Discusssion

Login to discuss.

Be the first to start discuss.

Related MCQs

Q. Routh Hurwitz criterion is better than root locus.

Q. In closed loop control system, with positive value of feedback gain the overall gain of the system will

Q. According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., fore

Q. In DC chopper, the waveform for input and output voltages is respectively __________

Q. The first order control system ,which is well designed has a

Q. Specific energy consumption becomes

Q. The number of sets used in pole changing type squirrel cage motors for derricks and winches, is

Q. In open loop system

Q. Rotor of the motor is usually supported on........... bearings

Q. OLTF contains one zero in right half of s- plane then