ECA
JNTUH OBJECTIVE EXAM
UNIT-1: (SINGLE STAGE
AMPLIFIERS)
SECTION-I : Choose the
correct answers
1.
Which of the following amplifier has
high power gain [ ]
(a) CB (b) CE (c)
CC (d) both CB and CE
2. The slope of ac load line is _________ that of
dc load line. [ ]
(a)
same as (b)more than (c) less than (d) None of the above
3. In a RC coupled amplifier, which of the
following component is mainly responsible for harmonic distortion of the
signal [ ]
(a)
Transistor (b) Biasing resistor (c) coupling capacitor (d) power supply
4. The voltage gain of well designed single stage
CB amplifier is essentially determined by ac collector load and [ ]
A.
Emitter resistor Re B. ac alpha C. Input resistance emitter diode D.ac beta.
5. The emitter of
a CE amplifier has no AC voltage because of the [ ]
A. DC voltage unit B. Bypass
Capacitor C. Coupling capacitor D. load resistance
6. Typical value of hie is [ ]
A. 1k B. 25k C.50k D.100k
SECTION-II: Fill in
the blanks
7. The parameter h22 has units
of _______.
8. A CC Amplifier has highest __________
but lowest ________.
9. The current gain of single stage CE
amplifier is nearly equal to __________.
10. The input impedance Ri of a
CE amplifier in terms of hie, hoe, hre and load resistance.
___________________.
11. The
phase difference between output and input voltages of a CB amplifier is
12. According
to Miller’s theorem, the feedback capacitance when referred to input side with
gain A is _______________________.
13. Trans
conductance gm
in hybrid - π model is defined as ______________________.
Prepared by
Neelima & Dhanalakshmi