# In AM signal, received signal power is 10-10W with a maximum modulating signal of 5 kHz. The noise spectral density at the receiver input is 10-18 W/Hz. If noise power is restricted to the message signal bandwidth only, then signals to noise ratio at the input to the receiver is

1.  43 dB

2.  66dB

3.  56 dB

4.  33 dB

4

43 dB

Explanation :
No Explanation available for this question

# What is the most noticeable effect of a small increase in temperature in the common emitter connected BJT

1.  Increase in ICE0

2.  Increase in output resistance

3.  decrease in forward current gain

4.  increase in forward current gain

4

Increase in ICE0

Explanation :
No Explanation available for this question

# For a BJT, early voltage VA is 100V. In common emitter configuration, quiescent VCE is 10V.What percentage change in quiescent IC would occur, if early voltage VA is made ∞

1.  10%

2.  20%

3.  5%

4.  0%

4

0\%

Explanation :
No Explanation available for this question

# While using a bipolar junction transistor as an amplifier, the collector and emitter terminals got interchanged mistakenly. Assuming that the amplifier is a common emitter amplifier and the biasing is suitably adjusted, the interchange of terminals will result into which one of the following

1.  Zero gain

2.  infinite gain

3.  reduced gain

4.  no change gain at all

4

reduced gain

Explanation :
No Explanation available for this question

# Equation of the amplitude modulated wave is

1.  Ek(1+Em/Ek)

2.   Ek cos ωk t+ EkEm cosωmt

3.  Ek sin ωk t+ Ek/Em sin ωkt+sin ωmt

4.  Ek cos ωk t+ EkEm cos2(ωm+ωm)k

4

Ek(1+Em/Ek)

Explanation :
No Explanation available for this question

# A 1000 kHz carrier Wave modulated 40% at 4000 Hz is applied to a resonant circuit tuned to a carrier frequency and having  Q = 140. What is the degree of modulation after transmission through this circuit

1.  40%

2.  20%

3.  0.027%

4.   0.54%

4

0.027\%

Explanation :
No Explanation available for this question

# In n-channel enhancement MOSFET, at a fixed drain voltage

1.  the drain current is maximum at zero gate voltage and it increases or decreases with the applied voltage of proper polarity

2.  the drain current has a finite value at zero

3.  the drain current is zero at zero gate voltage and it increases with the positive applied gate voltage

4.  the drain current is zero for negative bais voltage to gate and it increases as the negative gate bias is decreased in magnitude

4

the drain current is zero at zero gate voltage and it increases with the positive applied gate voltage

Explanation :
No Explanation available for this question

# An audio signal 15 sin2π(1500 t) amplitude modulates a carrier 60 sin 2π(100, 00t). the frequencies shown up in a spectrum analysis of the modulated wave are

1.  1.5kHZ, 100kHz

2.   1.5kHZ, 100kHZ, 103kHZ, 97kHZ

3.  100kHZ, 101.500kHZ, 98.500kHZ

4.  100kHZ, 103kHZ, 97kHZ

4

100kHZ, 101.500kHZ, 98.500kHZ

Explanation :
No Explanation available for this question

# The data sheet for a certain JFET (Junction field effect transistor ) indicates that IDS(drain to source current with gate shorted)=15mA and VGS(off)(cutoff value of gate to source voltage)=-5V, what is the drain current for VGS=-2V

1.  58.8mA

2.  29.4 mA

3.  9.6 mA

4.  5.4 mA

4

58.8mA

Explanation :
No Explanation available for this question

1.  5kHz

2.  10kHz

3.   15kHZ

4.  20kHz

4