A common-collector transistor circuit is often used
a) To provide high gain and sensitivity over a wide range of frequencies
b) To match a high impedance to a low impedance
c) As a high-fidelity audio power amplifier
d) As an oscillator at microwaves frequencies
e) As the rectifier in a dc power supply.
 The internal conductance of an ammeter is generally
b) Directly proportional to the current
c) Inversely proportional to the current
e) Any value. It doest matter
 A steady magnetic field can be produced by
a) A straight wire carrying a constant direct current.
b) A loop of wire carrying a constant direct current.
c) A coil of wire carrying a constant direct current.
d) A constant-intensity stream of protons in free space, moving in a straight line.
e) Any of the above.
 The output wave of a common-gate amplifier circuit with a pure sine-wave input
a) Is in phase with the input wave.
b) Lags the input wave by 90° of phase.
c) Leads the input wave by 90° of phase.
d) Is 180° out of phase with the input wave.
e) Is inverted with respect to the input wave.
 Which of the following capacitor types is polarized?
e) Air variable
 when a non zero net reactance exists in an ac circuit, the apparent power is
b) Equal to the true power
c) Less than the true power
d) Greater than the true power
 The gauss is a unit of
(a) Charge carrier flow speed.
(b) Magnetic flux density.
(c) Electrostatic field strength.
(d) Electromagnetic field intensity.
(e) Electrical charge quantity.
Ans:B. Exp: In SI system the unit is tesla(T). In CGS system the unit is Gauss
An average responding rectifier type electronic ac voltmeter has its
scale calibrated in terms of the rms value of a sine wave, when a square
wave voltage of peak magnitude 100V is measured using this voltmeter
then the reading indicated by the meter, will be ?
 A house served by a 220V supply light, is protected by a 9-Ampere
fuse. The maximum number of 60 W bulbs in parallel that can be turned on
 Silicon has a preference in IC technology because
(a) It is an indirect semiconductor
(b) It is a covalent semiconductor
(c) It is an elemental semiconductor
(d) Of the availability of nature oxide SiO
 Three equal resistance of magnitude 5 Ohm each are connected in
delta. The resistance between any two pair of terminals of the delta
(a) 5 Ohm
(b) 5/3 Ohm
(c) 10/3 Ohm
(d) 3/5 Ohm
 The R.M.S. value of a half wave rectified sinusoidal alternating current with peak value Im is
(a) Im / 1
(b) Im / v2
(c) Im / 2
(d) Im v3