Question is ⇒ If we need a low noise device, we should use, Options are ⇒ (A) BJT, (B) FET, (C) thyristor, (D) UJT, (E) , Leave your comments or Download question paper.

Question is ⇒ If we need a low noise device, we should use, Options are ⇒ (A) BJT, (B) FET, (C) thyristor, (D) UJT, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	If we need a low noise device, we should use
A.	BJT [Wrong Answer]
B.	FET [Correct Answer]
C.	thyristor [Wrong Answer]
D.	UJT [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : B 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 :

⇒ In Schering bridge, the potential of detector above earth potential is about
a few volts
10 kV
1000 V
either (a) or (b)

⇒ The widely used binary multiplication method is
repeated addition
add and shift
shift and add
any of the above

⇒ In C-language f- = 9 is equivalent to
f = -9
f = f - 9
f = 9 - 1
-f = 9

⇒ Which one is not correct for folded dipole antenna?
High I/P impedance
Low I/P impedance
High bandwidth
Used as reactance compensation network

⇒ The voltage gains of an amplifier without feedback and with negative feedback respectively are 100 and 20. The percentage of negative feedback would be.
0.4
0.05
0.2
0.8

⇒ In a junction transistor, the collector cut-off current 'I_CB0' reduces considerably by doping the
emitter with high level of impurity
emitter with low level of impurity
collector with high level of impurity
collector with low level of impurity

⇒ If air pressure in a rectangular waveguide is increased the maximum power handling capacity
is decreased
is increased
remains the same
may increase or decrease depending on pressure

⇒ Consider the following statement : If a network has an impedance of (1 - j) as a specific frequency, the circuit would consist of series

R and C
R and L
R, L and C

Which of the statement are correct?
1 and 2
1 and 3
1, 2 and 3
2 and 3

⇒ Mark out the WRONG statem
Needs very high-speed burst modems
Faces no problems caused by intermodulation of carriers so that transponder can be used at its full power
Needs high-speed manipulation of bit streams
Is less flexible so that channels of widely different capacities cannot used and intermixed

⇒ A unit step function is used to represent the closing a switch in a constant voltage system.
TRUE
FALSE

⇒ In a wave the electric field lines are vertical. Then the wave is
horizontally polarized
vertically polarized
either (a) or (b)
neither (a) nor (b)

⇒ For an ideal transformer
only Y parameter exist
only Z parameter
Z, Y both exist
neither Z parameter nor Y parameter exist

⇒ In CE configuration, the output characteristics of a bipolar junction transistor is drawn between
I_C and V_CB
I_E and V_CB
I_C and V_CE
I_E and V_CE

⇒ In controlled heating circuits, thyristors act as
rectifier
inverter
ac regulator
chopper

⇒ A series circuit has R = 5 Ω and C = 10 μF. At t = 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is
0.0833333333333333
0.0416666666666667
10⁶A
10 μA

⇒

Assertion (A): A half cycle of sine wave can be expressed as sum of sine wave and another sine wave shifted by T/2 where T is the time period.

Reason (R): The function u(t - t₀) - u(t - t₀ - T) is a gate function occuring at t = t₀ and of duration T.

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 true, R is false
A is false, R is true

⇒ Which one condition is true to check the periodically for discrete time signal (where K is any integer, N is period, f₀ is frequency of signal)
f₀ = K/N
f₀ = K + N
f₀ = KN
f₀ = N/K

⇒

Assertion (A): A decrease in temperature increases the reverse saturation current in a p-n diode.

Reason (R): When a diode is reverse biased surface leakage current flows.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true

⇒ A class C amplifier has input frequency of 200 kHz. If width of collector pulses is 0.1 μs, duty cycle is
0.01
0.02
0.1
0.2

⇒ If f is the frequency of electromagnetic wave, f_c is cutoff frequency, then in a rectangular waveguide
attenuation is low when f > f_c
attenuation is low when f < f_c
attenuation is high when f < f_c
either (b) or (c)

⇒ Which of the following can be used as a tachogenerator in control systems?
Microsyn
DC servomotor
AC servomotor
Magnetic amplifier

⇒ How many maximum number of functions can be defined with two symbols which are Boolean in nature:
4
8
2
16

⇒ Which one of the following power amplifier has the maximum efficiency?
Class A
Class B
Class AB
Class C

⇒

Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fir
Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct

⇒ The total field developed by an antenna array at a distant point is
phasor sum of fields produced by individual antennas of the array
algebraic sum of fields produced by individual antennas of the array
either (a) or (b) depending on type of array
neither (a) nor (b)

⇒ A₁₆ X 2₁₆ __________ .
16₁₆
15₁₆
14₁₆
13₁₆

⇒ Electronic tubes used for transmitter differ from their counterparts in the receivers in respect that
they are large in size
they are capable of handling large powers
they generate large amount of heat when in operation
none of the above

⇒ In a transistor receiver, the use of FET as the first stage amplifier is likely to
improve selectivity of the receiver
improve the effectiveness of the AGC
reduce the effect of negative peak clipping
reduce the effect of noise at all frequencies

⇒ In a CD the channel separation is
1 μm
1.6 μm
2.5μm
4 μm

⇒ It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is
chromel constantan
iron constantan
chromel aluminium
platinum-rhodium