Question is ⇒ An amplifier has an input resistance of 10 kΩ and the noise voltage is 10 μV. If two such resistances of 10 kΩ each are connected in series at the input, the total noise voltage is about, Options are ⇒ (A) 20 μV, (B) 5μV, (C) 14.14 μV, (D) 10 μV, (E) , Leave your comments or Download question paper.

Question is ⇒ An amplifier has an input resistance of 10 kΩ and the noise voltage is 10 μV. If two such resistances of 10 kΩ each are connected in series at the input, the total noise voltage is about, Options are ⇒ (A) 20 μV, (B) 5μV, (C) 14.14 μV, (D) 10 μV, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	An amplifier has an input resistance of 10 kΩ and the noise voltage is 10 μV. If two such resistances of 10 kΩ each are connected in series at the input, the total noise voltage is about
A.	20 μV [Wrong Answer]
B.	5μV [Wrong Answer]
C.	14.14 μV [Correct Answer]
D.	10 μV [Wrong Answer]
View Answer 1 -2 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 :

⇒ The no. of comparators required in a 3 bit comparator type ADC is
2
3
7
8

⇒ A DIAC has two terminals, anode and cathode.
TRUE
FALSE

⇒ What is the correct sequence of the following step in the fabrication of a monolithic, Bipolar junction transistor?

Emitter diffusion
Base diffusion
Buried layer formation
E pi-layer formation

Select the correct answer using the codes given below:
3, 4, 1, 2
4, 3, 1, 2
3, 4, 2, 1
4, 3, 2, 1

⇒ The circuit show
voltage series feedback amplifier
transconductance amplifier
transresistance amplifier with open circuit mutual resistance R_F
transresistance amplifier with short circuit mutual resistance R_F

⇒ The impedance of a coil above self-resonant frequency is
inductive
capacitive
resistive
none

⇒

Match the following:

	List I		List II
A.	p type semiconductor	1.	silicon
B.	n type semiconductor	2.	holes are majority carriers
C.	Intrinsic semiconductor	3.	electrons are majority carriers
D.	Tungsten	4.	is a metal

A-2, B-3, C-1, D-4
A-1, B-2, C-3, D-4
A-4, B-3, C-2, D-1
A-3, B-1, C-2, D-4

⇒ The moving iron instruments are generally repulsion type.
TRUE
FALSE

⇒ X and Y are two random variables and Z = X + Y . Letmz, m_z, m_x, m_y represent mean of Z, X and Y. Then
m_z = m_x + m_y
m_z ≤ m_x + m_y
m_z< m_x + m_y
m_z > m_x + m_y

⇒ The method used to transfer data from I/O units to memory by suspending the memory-CPU data transfer for one memory cycle is called
I/O spooling
Cycle stealing
Line conditioning
Demand paging

⇒ EM 84 tube is used in radio receivers as
audio amplifier
RF amplifier
full wave rectifier
magic eye

⇒ The resolution of a wire wound potentiometer is about
0.00001
0.001
0.01
0.05

⇒ For measuring inductance with high Q, we should use
Maxwell's bridge
Maxwell Wien bridge
Hay's bridge
Either (a) or (b)

⇒ The length of character constant P . b b . E . b C . is
9
6
10
7

⇒

Assertion (A): The maximum range of a radar is proportional to fourth root of the peak transmitted pulse power.

Reason (R): Radar signals are subjected twice to inverse square law.

Assertion (A): In Darlington pair, the overall β is product of individual β_s

Reason (R): The voltage gain of a base driven amplifier is equal to ac collector voltage divided by ac base voltage

Both A and R are correct and R is correct explanation for A
Both A and R are correct but R is not correct explanation for A
A is correct R is wrong
A is wrong R is correct

⇒ The function (s + 2) (s + 4)/[(s + 1)(s + 3)]
is a reactance function
is an RC function
may be a reactance function or an RC function
may be RC function or an RL function

⇒ A choke coil of resistance R and inductance L is shunted by capacitor C. The dynamic resistance is
R/LC
C/RL
L/RC
1/RLC

⇒

Assertion (A): The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.

Reason (R): Free space has an intrinsic impedance of 377 ohms.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct