Question is ⇒ If operator 'a' = 1 ∠120° then (1 + a) =, Options are ⇒ (A) -a, (B) -a2, (C) a, (D) -1, (E) , Leave your comments or Download question paper.

Question is ⇒ If operator 'a' = 1 ∠120° then (1 + a) =, Options are ⇒ (A) -a, (B) -a2, (C) a, (D) -1, (E) , Leave your comments or Download question paper. a' = 1 ∠120° then (1 + a) =, Options are ⇒ (A) -a, (B) -a², (C) a, (D) -1, (E) , Leave your comments or Download question paper. '/> a' = 1 ∠120° then (1 + a) =, Options are ⇒ (A) -a, (B) -a², (C) a, (D) -1, (E) , Leave your comments or Download question paper. '/>Previous question Next question


Q1.	If operator 'a' = 1 ∠120° then (1 + a) =
A.	-a [Wrong Answer]
B.	-a² [Correct Answer]
C.	a [Wrong Answer]
D.	-1 [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 which of the following schemes are several channels interleaved and transmitted together?
TDM
FDM
group
subgroup

⇒

Assertion (A): A composite video signal has synchronising pulses.

Reason (R): It is necessary to synchronise the scanning process in the transmitter and receiver.

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

⇒ When UJT is used for thyristor gate signal, the output of UJT is
sine wave
square wave
saw tooth wave
either (a) or (c)

⇒ In a colour TV receiver, which of the following incorporates colour saturation control?
Chroma detector
Colour killer circuit
SAW filter
Chroma amplifier

⇒ An RLC series circuit is fed form 100 V ac supply. Inductance is 1 H and Q = 7.5. At resonance, the voltage across inductance is
750 V
100 V
about 13.5 V
1500 V

⇒ An antenna has a resistance of 50 Ω and an equivalent noise resistance of 30 Ω The noise figure in decibels is
1.6 dB
2 dB
3.6 dB
6 dB

⇒

Assertion (A): If a wave v = A₁ + A₂ sin ωt is applied to a pure capacitor the current wav
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

⇒ In the given figure the input frequency is such that R << X_c,
v₀ lags v_i by 90°
v₀ leads v_i by 90°
v₀ and v_i are in phase
either (b) or (c)

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

⇒ Integral error compensation changes a second order system to
first order system
third order system
fourth order system
either (a) or (b) depending on the system

⇒ In CE amplifier circuit, voltage gain is directly proportional to
β
collector supply voltage
base resistance
none of the above

⇒ A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain of 1. What is the output voltage?
1.0 V
1.5 V
2.0 V
2.5 V

⇒

Assertion (A): When reverse voltage across a p-n junction is increased, the junction capacitance decreases.

Reason (R): Capacitance of any layer is inversely proportional to thickness.

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

⇒ An ideal op-amp can amplify dc signals
TRUE
FALSE

⇒ Consider the following statements as regards DPSK and DEPSK

DPSK demodulator requires a device which operates at carrier frequency and provides a delay of bit time T_b
In DPSK, synchronous demodulation recovers the signal b(t) and the decoding of b(t) to generate d(t) is done at base band
In both DPSK and DEPSK errors always occur in pairs

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

⇒ Which of the following is not a classification of programmed data transfer?
Synchronous transfer
Hand shaking
Interrupt driver transfer
Direct transfer

⇒ In the amplifier circuit figure the quiescent point voltage and current
12 V, 5 mA
12 V, 2 mA
10 V, 2 mA
10 V, 5 mA

⇒ In the circuit shown in figure, maximum power will be transferred
Z_L = 13 - j 9
Z_L = 13 + j 9
Z_L = 9 - j 13
Z_L = 9 + j 13

⇒ Which of the following needs DC forward voltage to emit light?
LED
LCD
Both LED as well as LCD
None of the above

⇒ Which one of the following parameters does not exist for the two port network shown in the given fig
ABCD
y
h
z

⇒ Baudot code is a six bit code.
TRUE
FALSE

⇒ Which of the following is invalid in Basic?
A ** B - C
5.2 ** 4.3
5.2 ** (- 4.3)
(- 5.2) ** (4.3)

⇒ In the circuit shown below, the outputs Y₁ and Y₂ for the given initial condition Y₁ = Y₂ = 1 and after four input pulses wil
Y₁ = 1, Y₂ = 0
Y₁ = 0, Y₂ = 0
Y₁ = 0, Y₂ = 1
Y₁ = 1, Y₂ = 1

⇒ Which of the following is a valid real constant?
1281
1281
KM
11821

⇒ For the circuit shown in the figure, the time constant RC = 1 ms. The input voltage is V₁(t) = 2 sin 10³ t. The output voltage V₀(t) is equa
sin (10³ t - 45°)
sin (10³ t + 45°)
sin (10³ t - 53°)
sin (10³ t + 53°)

⇒ A planar array radar uses a high gain planar array antenna.
TRUE
FALSE

⇒ A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is
25
50
100
200

⇒

Assertion (A): A complicated waveform can be replaced by sum or difference of two or more waveforms.

Reason (R): The method of superposition is applicable only to linear systems.

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

⇒ In Weston frequency meter, the magnetic axes of the two fixed coils are
parallel
perpendicular
inclined at 60°
inclined at 15°

⇒

Assertion (A): Damping in a vibration galvanometer is small.

Reason (R): Vibration galvanometer is a PMMC instrument.

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 R is false
A is false R is true