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

Previous

Next

Discusssion

Login to discuss.

Be the first to start discuss.

Related MCQs

Q. The temperature, under thermal and electrical system analogy, is considered analogous to

Q. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except

Q. Which of the following devices should be used as a switch for high power and high voltage application?

Q. The type 0 system has ______ at the origin.

Q. Most commonly used ac motor is

Q. In electrical-pneumatic system analogy the current is considered analogous to

Q. In the cascaded form of realisation, the polynomials are factored into

Q. State space analysis is applicable for non- linear systems and for multiple input and output systems.

Q. State model representation is possible using _________

Q. The criterion on which oscillations are produced in the oscillator circuit is called: