Question is ⇒ A CE amplifier has re = 6 Ω, β = 100 and a = 0.98. The input impedance is, Options are ⇒ (A) 6 Ω, (B) 100 Ω, (C) 600 Ω, (D) 98 Ω, (E) , Leave your comments or Download question paper.

Question is ⇒ A CE amplifier has re = 6 Ω, β = 100 and a = 0.98. The input impedance is, Options are ⇒ (A) 6 Ω, (B) 100 Ω, (C) 600 Ω, (D) 98 Ω, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	A CE amplifier has r_e = 6 Ω, β = 100 and a = 0.98. The input impedance is
A.	6 Ω [Wrong Answer]
B.	100 Ω [Wrong Answer]
C.	600 Ω [Correct Answer]
D.	98 Ω [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Which of the following antenna is obtained by modifying a waveguide?
Microstrip Antenna
Helical Antenna
Horn Antenna
Dipole Antenna

⇒ In following circuit, steady state is reached with S open, S is closed at t = 0, the current I at t = 0⁺ is give
9 Ω
6 Ω
7 Ω
10 Ω

⇒ A copper coil has a resistance of 40 ohm at 20°C. At 100°C the resistance is likely to be
44 Ω
54 Ω
84 Ω
104 Ω

⇒ In 8085 microprocessor with memory mapped I/O which of the following is true?
I/O devices have 16 bit addresses
I/O devices are accessed during IN and OUT instructions
There can be a maximum of 256 input and 256 output devices
Logic operations can not be performed

⇒ A 300 MHz plane EM wave is propagating in free space. The wave is incident normally on an infinite copper slap. The antenuation constant for the wave is (σ_copper = 5.8 x 10⁷ mho/ m). The skin depth is
0.005 x 10^-3 m
0.0038 x 10^-3m
0.0028 x 10^-3 m
0.0024 x 10^-3 m

⇒ For the truth table of the given figure
A + B + C
A + BC
A
B

⇒ What is typical bandwidths of a 2-wire telephone line?
300 Hz to 3.4 kHz
20 Hz to 4 kHz
dc to 4 kHz
20 Hz to 20 kHz

⇒ A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be
0.6 Ω
0.06 Ω
0.1 Ω
0.004 Ω

⇒ Wagner earthing device eliminates
all stray capacitance in the circuit
stray capacitances between components
stray capacitance between detector terminal and ground
mutual coupling between components

⇒ Two capacitors of 2 μF and 4 μF capacitance are connected in series across a 30 V dc battery. After the capacitors have been charged, the voltage across them will be
15 V each
10 V and 20 V
20 V and 10 V
30 V each

⇒ For the two port of figure, z_{1126/7 Ω
10/3 Ω
6 Ω
2 Ω}

⇒ In PCM, the biggest disadvantage as compared to AM is
larger bandwidth
larger noise
inability to handle analog signals
incompatibility with time division multiplex systems

⇒ Method of images is applicable to which fields?
Electrostatic fields only
Electrodynamic fields only
Neither electrostatic fields nor electro-dynamic fields
Both electrostatic fields and electro-dynamic fields

⇒ In 8085 which addressing mode is also called inherent addressing?
Direct
Register
Implicit
Immediate

⇒ A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is
3.45 x 10^-15 W
1.38 x 10^-15 W
7.5 x 10^-15 W
93.15 x 10^-15 W

⇒ A practical Parallel resonant circuit has a coil in Parallel with a 0.14 μf capacitor. The coil has an inductance of 1 mH and a resistance of 10 ohms. The Q of the circuit is
1000
100
10
1

⇒ A series R-C circuit with R = 3 Ω and X_C = 4 Ω at 50 Hz is supplied with a voltage V = 50 + 141.4 sin 314 t. What is the RMS value of the current flowing through the circuit?
0.208333333333333
0.416666666666667
20 A
22-36 A

⇒ The skin depth of copper is found to be 66 mm at 1 MHz at a certain temperature. At the same temperature and at 2 MHz, the skin depth would be approximately
47 μm
33 μm
92 μm
1.22 μm

⇒ The auto correlation of a sampling function is a
triangular function
gate function
signum function
none of the above

⇒ Macroscopic quantities of a given material
are absolutely constant
are a function of temperature
are a function of temperature, pressure field
none of the above

⇒ For stable network, the real part of poles and zeros of driving point function must be
negative
negative or zero
zero
positive

⇒ For the system in the given figure G varies slightly, the ratio of open loop sensitivity to closed loop sensitivit
1 : (1 + GH)
1 : (1 + GH)^-1
1 : (1 - GH)
1 : (1 - GH)^-1

⇒ If a and b are the dimensions of waveguide then
a = 3b
a = 2b
a = b
a = b/4

⇒ A phasor is
a line representing the magnitude and direction of an alternating quantity
a line which represents the magnitude and phase of an alternating quantity
an instrument used for measuring phases of an unbalanced 3-phase load
a coloured tag or band for distinguishing between different phases of a 3-phase supply

⇒ Ridge waveguide is essentially a form of capacitively loaded guide.
TRUE
FALSE

⇒ How many lines are there in address bus of 8085 μp?
6
8
12
16

⇒ The emf of a Weston cell is 1.286 V.
TRUE
FALSE

⇒ Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectivel
8, 4, 2, 2, 0 mW
0, 8, 4, 4, 0 mW
0, 8, 2, 2, mW
8, 2, 4, 2, 0 mW

⇒ The colour on the extreme left in general purpose fixed resistors represents
first significant digit
tolerance
wattage rating
voltage rating

⇒ A typical value of g_m for a FET is about 25 μs.
TRUE
FALSE