Question is ⇒ A varactor diode is used for, Options are ⇒ (A) tuning, (B) rectification, (C) amplification, (D) rectification and amplification, (E) , Leave your comments or Download question paper.

Question is ⇒ A varactor diode is used for, Options are ⇒ (A) tuning, (B) rectification, (C) amplification, (D) rectification and amplification, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	A varactor diode is used for
A.	tuning [Correct Answer]
B.	rectification [Wrong Answer]
C.	amplification [Wrong Answer]
D.	rectification and amplification [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A 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 :

⇒

Assertion (A): A multiplexer can be used for data routing.

Reason (R): A multiplexer has one input and many outputs.

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

⇒ The coils of Drysdale polar potentiometer are wound non-inductively.
TRUE
FALSE

⇒ For a full wave bridge rectifier supplied with 50 Hz a.c., the lowest ripple frequency will be
50 Hz
100 Hz
200 Hz
400 Hz

⇒ Which instrument needs creep compensation?
Dynamometer wattmeter
Induction wattmeter
Energy meter
Both (b) and (c)

⇒ A diode can have a very high forward resistance.
TRUE
FALSE

⇒ The operator precedence in Java is in the order
arithmetic operation, increment and decrement operation, comprassion, logical operation and assignment operation.
increment and decrement operation, arithmetic operation, comparison, logical operation and assignment operation.
comparison, arithmetic operation, increment and decrement operation, logical operation and assignment operation.
arithmetic operation, comparison operation, increment and decrement operation, logical operation and assignment operation.

⇒ Which one is a causal system?
y(n) = 3x[n] - 2x[n - 1]
y(n) = 3x[n] + 2x[n + 1]
y(n) = 3x[n + 1] + 2x[n - 1]
y(n) = 3x[n + 1] 2x[n - 1] + x[n]

⇒ Which of the following statements is false?
Push pull signals are equal and opposite in phase
Class AB operation cannot be used for a push pull audio power output phase
A push pull output transformer has a centre-tapped primary
All of the above

⇒

Assertion (A): Germanium is more commonly used than silicon.

Reason (R): Forbidden gap in germanium is less than that in silicon.

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

⇒ Consider the following statements:

A flip-flop is used to store 1-bit of information.
Race-around condition occurs in a J-K flip-flop when both the inputs are 1.
Master-slave configuration is used in flip-flops to store 2-bits of information
A transparent latch consists of a D-type flip-flop.

Which of the above statements is/are correct?
1 only
1, 3 and 4
1, 2 and 4
2 and 3 only

⇒ Which of the following instruments is used almost exclusively to measure radio frequency currents?
Moving coil
Rectifier
Moving iron
Thermocouple

⇒ Examine the following statements

A small size hydraulic actuator can develop good torque.
It is easy to maintain a hydraulic system leak proof.
Both linear and rotatary hydraulic actuators are available.
Hydraulic power is more easily available than electric power.

Which of the above statements are correct?
all
1 and 2 only
1 and 3 only
2, 3 and 4 only

⇒ Electric breakdown strength of a material depends on its
composition
moisture content
thickness
all of the above

⇒ Directivity and beamwidth is related as
D ∝ B
D ∝ 1/B
D ∝ B
D ∝ B²

⇒ In a 3 phase fully controlled converter the firing frequency is
3 times the line frequency
6 times the line frequency
9 times the line frequency
12 times the line frequency

⇒ The main advantage of CC amplifier is
High input impedance and low output impedance
Low input impedance and high output impedance
High voltage gain
High current gain

⇒ Waveform shown in figure is that
FM
PCM
AM-DSB
AM-SSB

⇒ When microprocessor processes both positive and negative numbers, the representation used is
l's complement
2's complement
signed binary
any of the above

⇒ The 8085 instruction 'PUSH PSW' belongs to the group
data transfer
arithmetic
logic
none of the above

⇒ A P-N junction diode dynamic conductance is directly proportional to
the applied voltage
the temperature
its current
thermal voltage

⇒ Consider Pole zero diagram as shown, If two Poles are moved in opposite direction towards ω = p/2 and -p/2, the filter wil
change to high pass filter
change to Band Pass filter
remains same
change to LPF

⇒ A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains
3 full waves of input
3 half waves of input
6 full waves of input
6 half waves of input

⇒ Which of the following circuits can be used as parallel-to-series converter?
Digital counter
Decoder
Demultiplexer
Multiplexer

⇒ To obtain very high I/P and O/P impedances in a feedback amplifier, the topology used is
voltage series
current series
voltage shunt
current shunt

⇒ Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that
the frequency of one input is 5 times that of other
the difference between the frequencies of the two signals is one fifth of hertz
the difference between the frequencies of the two signals is 5 Hz
either (a) or (c)

⇒

Assertion (A): Water waves are longitudinal but EM waves are transverse

Reason (R): In an EM wave electric field, magnetic field and propagation are mutually perpendicular.

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

⇒ The two modes of operation of three phase bridge inverters are known as
60° mode and 120° mode
90° mode and 120° mode
120° mode and 180° mode
120° mode and 240° mode

⇒ A decade counter skips
binary states 1000 to 1111
binary states 0000 to 0011
binary states 1010 to 1111
binary states 1111 to higher

⇒ In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to
50% of peak reverse current
25% of peak reverse current
10% of peak reverse current
zero value

⇒ Which of the following codes is based on BCD format?
EBCDIC
ASCII
Hollerith
both (a) and (b)