List of top Electronics and Communication Engineering Questions asked in Telangana State Post Graduate Engineering Common Entrance Test

If the input to an OP-AMP comparator is a sine wave, then the output is a
Find the operating frequency of a transistor Hartley oscillator for \(L_1 = 20\mu\text{H}\), \(L_2 = 40\mu\text{H}\) and mutual inductance between coils is \(2\mu\text{H}\) and \(C = 1\mu\text{F}\).
The maximum dc output power in a Half wave rectifier occurs when the load resistance is \___ the diode forward resistance.
Half wave and Full wave rectifiers produce nearly identical ____ for equal values of transformer secondary voltage.
The midband gain of an amplifier is 100 and the lower cutoff frequency is 1 KHz. Find the gain of the amplifier at a frequency of 20 Hz.
Which of the following is not correct with respect to Darlington amplifier?
When the negative feedback is applied to an amplifier of gain 100, the overall gain falls to 50. If the same feedback factor is maintained, the value of the amplifier gain required for the overall gain of 75 is
Match the following
i–ivConnection Typea–dFeedback Description
iVoltage shunt aCurrent sampling, voltage mixing
iiVoltage seriesbCurrent sampling, current mixing
iiiCurrent shuntcVoltage sampling, current mixing
ivCurrent seriesdVoltage sampling, voltage mixing
An 'n' channel JFET has \(I_{DSS}=8\text{mA}\), \(V_P=-5\text{V}\). Determine the minimum value of \(V_{DS}\) for \(V_{GS}=-2\text{V}\) in the pinch off region.
The disadvantage of the integrated circuit technology as compared with discrete components interconnected is
In a photodiode, light produces
LEDs are based on the principle of
The SiO\(_2\) is grown by exposing the epitaxial layer to an oxygen atmosphere while being heated to about 1000\(^\circ\)C, because Silicon dioxide has the fundamental property of
A shunt regulator is a type of
The rise time of a BJT is 3.5 micro seconds. Find its transition frequency.
The LTI system is said to be initially relaxed system when
Choose the wrong one with respect to nMOSFET compared to pMOSFET
Which of the following is not correct, when the collector base junction is reverse biased?
Phase variation with respect to frequency is given by \( \phi(\omega) = 2\omega^2 + \cos\omega \). Then, group delay of the system is
The electrical conductivity of pure semiconductor can be increased by
The electric current produced when the charge carrier concentration moves from region of higher concentration to the region of lower concentration is called
The condition for orthogonality of two functions \( x_1(t) \) and \( x_2(t) \) in terms of correlation is
Which of the following is not correct with respect to Z-transforms?
Match the following with respect to region of convergence
\( x(n) \) ROC
AInfinite duration causal sequenceIEntire z-plane except at \( z = 0 \)
BFinite duration causal sequenceIIEntire z-plane except at \( z = \infty \)
CInfinite duration anticausal sequenceIII\( |z| > \alpha \), exterior of a circle of radius \( \alpha \)
DFinite duration anticausal sequenceIV\( |z| < \beta \), interior of a circle of radius \( \beta \)
Unilateral Z transform of x(n) is equivalent to bilateral Z-transform of