Question is ⇒ The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant and φ(t) is a function of base signal represents <ol style="list-style-type: decimal; padding-bottom:10px;"><li style="padding-top:10px;">Phase modulation</li><li style="padding-top:10px;">Amplitude modulation</li><li style="padding-top:10px;">Angle modulation</li><li style="padding-top:10px;">Frequency modulation</li></ol> Which of the above are true?, Options are ⇒ (A) 3 only, (B) 1, 3 and 4, (C) 1, 2, 3, 4, (D) 3 and 4 only, (E) , Leave your comments or Download question paper.

Question is ⇒ The equation v(t) = A cos [ωct + φ(t)] where A and ωc are constant and φ(t) is a function of base signal represents <ol style="list-style-type: decimal; padding-bottom:10px;"><li style="padding-top:10px;">Phase modulation</li><li style="padding-top:10px;">Amplitude modulation</li><li style="padding-top:10px;">Angle modulation</li><li style="padding-top:10px;">Frequency modulation</li></ol> Which of the above are true?, Options are ⇒ (A) 3 only, (B) 1, 3 and 4, (C) 1, 2, 3, 4, (D) 3 and 4 only, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The equation v(t) = A cos [ω_ct + φ(t)] where A and ω_c are constant and φ(t) is a function of base signal represents Phase modulation Amplitude modulation Angle modulation Frequency modulation Which of the above are true?
A.	3 only [Wrong Answer]
B.	1, 3 and 4 [Correct Answer]
C.	1, 2, 3, 4 [Wrong Answer]
D.	3 and 4 only [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 :

⇒ Which of the following is a microwave source with a 'cross-field' structure?
Double cavity klystron
Reflex klystron
Magnetron
Travelling wave tube

⇒ Typical values of current gains for CE, CB and CC amplifiers are
120, 120 and 1 respectively
120, 1 and 120 respectively
1, 120 and 120 respectively
1, 1 and 120 respectively

⇒ A p-n junction diode has
low forward and high reverse resistance
a non-linear v-i characteristics
zero forward current till the forward voltage reaches cut in value
all of the above

⇒ In the circuit shown in the given figure, power dissipated in the 5 Ω resisto
zero
80 W
125 W
405 W

⇒ DC amplifiers have a tendency to be unstable.
TRUE
FALSE

⇒

Assertion (A): Temperature control of the passenger compartment of car uses both feed forward and feedback controls.

Reason (R): Feed forward control gives corrective action before the disturbance affects the output and feedback control applies corrective action after output changes.

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
R is correct but A is wrong

⇒ Antenna reciprocity is put to use in
radar system
commercial broadcast
TV broadcast system
none of the above

⇒ A digital system is required to amplify a binary encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary is,
8
6
5
7

⇒ In amplifiers, the parasitic oscillation result due to
transistor inter junction capacitance
push pull operator
negative feedback
poor inter-stage coupling

⇒ A current tracer responds to
steady current only
pulsating current only
both pulsating and steady current
none of the above

⇒ In a digital circuit, a clock is a
crystal type
multivibrator
flip-flop
free running multivibrator

⇒ The angle subtended by earth at geostationary communication satellite is
17.34°
51.4°
120°
60°

⇒ The current through a 1 mH inductance is i(t) = 2.56 x 10^-2 - 4 x 10³ t for 2 ≤ t ≤ 20 μ sec. The voltage across the inductor is
4
8
0
8 x 10³

⇒ During fast forward operation of a tape recorder
all heads are withdrawn
all amplifiers are shut off
tape is not pressed against capstan
all of the above

⇒ The number of switching functions of 3 variables are
3
8
16
32

⇒ A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be.
60 ns
40 ns
20 ns
None

⇒ A frequency multiplier stage should operate as
class A
class AB
class C
either of the above

⇒ A TV receiver is 40 cm wide and 30 cm high. The EHT supply required is about
2kV
20 kV
53 kV
10 W

⇒ In a 741 OP-amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to
applied load
internal compensation
impedance of the source
power dissipation in the chip

⇒ In figure, the switch is closed at t = 0. After some time i = 6A and rate of change of current was 4A/s. The value of inducto
1 H
1.5 H
indeterminate
0.5 H

⇒ Strip lines are used at
microwave frequency
low frequency
High frequency
at any frequency

⇒ In rectangular waveguides the ratio of width to height is about
0.5
1
2
4

⇒

Match the following:

	List I		List II
A.	CTFS	1.	Periodic
B.	DTFS	2.	Non-periodic
C.	CTFT
D.	DTFT

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

⇒

Assertion (A): A PROM can be used as a synchronous counter

Reason (R): Each memory location in a PROM can be read synchronously.

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 feedback control system shown in the given figure repres
Type 0 system
Type 1 system
Type 2 system
Type 3 system

⇒ A series resonant circuit has parameters 10 ω, 1 H and 0.1 F. It is excited by a voltage v = 100 sin ωt. At resonant frequency, the power dissipated in the circuit is
1000 W
707 W
500 W
414.14 W

⇒ In figure, the value of R shoul
0.2 Ω
0.1 Ω
0.05 Ω
0.1 Ω

⇒ The organisatioion of Intel memory chip 127256 is
32 K x 8
16 K x 8
32 K x 4
16 K x 4

⇒

Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

Reason (R): Thermionic emission current ∝ T² e^-Ew/kT.

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

⇒ It is possible to use a freewheeling diode in
single phase half wave controlled rectifier as well as in single phase full wave controlled rectifier (M - 2 connection)
single phase half wave controlled rectifier but not in single phase full wave controlled rectifier (M - 2 connection)
single phase full wave controlled rectifier (M - 2 connection) but not in single phase half wave controlled rectifier
all controlled rectifier circuits