Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | Super high frequency means more than 3000 MHz. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ In a FM receiver, amplitude limiter

amplifiers low frequency signals

reduces the amplitude of signals

eliminates any change in amplitude of received FM signals

none of the above

⇒ An AC circuit has two branches in parallel. The current in one branch is 5 A. Then the current source

must be less than 5 A

must be more than 5 A

may be equal or more or less than 5 A

0.208333333333333

⇒ If a common emitter amplifier with an emitter resistance R

_{C}has an overall transconductance gain of 1 m A/V, a voltage gain of - 4 and desensitivity of 50, then the value of the emitter resistance R would be

50 kΩ

0.98 kΩ

50 Ω

0.98 Ω

⇒ In the circuit shown in the figure, the current supplied by the sinusoidal current source

28 A

0.166666666666667

20 A

not determinable from the data given

⇒ Which is the displacement transducer with excellent sensitivity, linearity and resolution?

Incremental encoder

Absolute encoder

LVDT

Strain gauge

⇒ If A is 1011, A" is

1011

100

1100

1010

⇒ The receiver of a pulsed RADAR can detect signal power in the order of

1 W

0.1 W

10

^{-5}W

10

^{-12}W

⇒ In auxiliary commutated chopper, the charging and discharging time of capacitor

are constant

depend on load current

may be constant or may depend on load current

none of the above

⇒ In a gate output is Low if and only if all inputs are High. The gate is

OR

AND

NOR

NAND

⇒ A 1000 kHz carrier wave modulated 40% at 40000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulator after transmission through the circuit?

0.4

0.2

0.27

0.54

⇒ In an SCR, the anode current is controlled by

gate current only

external circuit only

both gate current and external circuit

none of the above

⇒ The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about

10 minutes on 5 consecutive days

5 minutes on 10 consecutive days

30 minutes for 5 consecutive days

one hour for 5 consecutive days

⇒ A tape recorder and deck are entirely similar.

TRUE

FALSE

⇒ For use at 50 Hz the range of scale of vibrating reed frequency meter is

25 - 75 Hz

40 - 60 Hz

47 - 53 Hz

42 - 58 Hz

⇒ In plotting line spectrum

a graph of complex number F

_{n}versus frequency is plotted

a graph of |F

_{n}| versus frequency is plotted

a graph of the angle of F

_{n}versus frequency is plotted

two graphs viz |F

_{n}| versus frequency and the phase angle of F

*n*versus frequency are plotted

⇒ A lossless transmission line with air dielectric is 6 m long. What is the line length at 30 MHz?

1 wavelength long

0.5 wavelength long

0.6 wavelength long

0.25 wavelength long

⇒ A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is

500

5

0.014

0.002

⇒ Reflectors and lens antennas are commonly used

in LF communication systems

not beyond 100 kHz

in the range 10 MHz to 100 MHz

above 100 MHz

⇒ In a square law modulator, the carrier frequency should be __________ times than the highest modulating frequency.

1

2

4

3

⇒ 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

1 and 3

1 and 2

2 and 3

1, 2 and 3

⇒ A network is causal if impulse response is zero for

*t*< 0.

TRUE

FALSE

⇒ In pulse code modulation, if the signal is sampled at the rate of

*f*and the number of pulses in one code group is

*p*, then the number of pulses per second will be

*p*/

*f*

*f*/

*p*

1/

*pf*

*pf*

⇒ An insulator will conduct when the

voltage applied is more than the breakdown voltage

temperature is raised to very high level

either (a) or (b) above

none of the above

⇒ If number of information bits is 4, the parity bits in Hamming code are located at bit positions __________ from the LSB.

1, 2, 5

1, 2, 4

1, 2, 3

1, 2

⇒ In Pascal the repeat and while loops will terminate

only when the logical expression controlling the loop becomes true for both repeat and while loops

only when the logical expression controlling the loop becomes false for both repeat and while loops

only when the logical expression controlling the loop becomes true for repeat loop and false for while loop

only when the logical expression controlling the loop becomes false for repeat loop and true for while loop

⇒ A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance

increases

decreases

remains constant

may increases or decreases

⇒ A signal

*x*

_{1}(

*t*) and

*x*

_{2}(

*t*) constitute the real and imaginary parts respectively of a complex valued signal

*x*(

*t*). What form of waveform does

*x*(

*t*) possess?

Real symmetric

Complex symmetric

Asymmetric

Conjugate symmetric

⇒ AC hum is picked up from power cables

TRUE

FALSE

⇒ The pole zero plot of the given figure is

non-minimum phase function

minimum phase function

all pass function

either (b) or (c)

⇒ In a JFET, gates are always

forward biased

reverse biased

either forward or reverse biased

unbiased