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Q1. | A voltage V(t) is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt^{2}. If it is measured by a dc meter. The reading will be |

A. | 0 [Correct Answer] |

B. | 4 [Wrong Answer] |

C. | 2 [Wrong Answer] |

D. | 2 [Wrong Answer] |

View Answer
Explanation:-
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**Also Read Similar Questions Below :**

⇒ A single turn loop is situated in air, with a uniform magnetic field normal to its plane. The area of the loop is 5 m

^{2}and the rate of change of flux density is 2 Wb/m

^{2}/s. What is the emf appearing at the terminals of the loop?

-5 V

-2 V

-0.4 V

0 V

⇒

Match the following:

List I (Comm.services) | List II (Bandwidth) | ||
---|---|---|---|

A. | AM broadcast | 1. | 10 kHz |

B. | Telephone | 2. | 4 kHz |

C. | wide-band FM | 3. | 200 kHz |

D. | TV | 4. | 7 MHz |

A-1, B-2, C-3, D-4

A-3, B-4, C-1, D-2

A-1, B-4, C-3, D-2

A-3, B-2, C-1, D-4

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Anderson Bridge | 1. | Low resistance |

B. | Kelvin Bridge | 2. | Medium resistance |

C. | Schering Bridge | 3. | Inductance |

D. | Wheatstone Bridge | 4. | Capacitance |

A-4, B-2, C-3, D-1

A-3, B-2, C-4, D-1

A-3, B-1, C-4, D-2

A-4, B-1, C-3, D-2

⇒ Which camera tube has gamma of almost unity?

Vidicon

Plumbicon

New vicon

Saticon

⇒ Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C

0.5

5

5.657

5.756

⇒ An intrinsic semiconductor (intrinsic electron density = 10

^{16}m

^{-3}) is deped with donors to a level of 10

^{22}m

^{-3}. What is the hole density assuming all donors to be ionized?

10

^{7}m

^{-3}

10

^{8}m

^{-3}

10

^{10}m

^{-3}

10

^{6}m

^{-3}

⇒ In radar systems PRF stands for

Power Return Factor

Pulse Return Factor

Pulse Repetition Frequency

Pulse Response Factor

⇒ If

*i*= 10 + 12 cos 500

*t*- 3.5 sin 500

*t*, then in amplitude phasse form

*i*=

10 + 12.5 sin (500

*t*+ 106.20°)

5 + 12.5 sin (500

*t*+ 106.20°)

10 + 11 sin (500

*t*+ 106.20°)

10 + 12.5 sin (500

*t*+ 10°)

⇒ For a junction FET in the pinch off region as the drain voltage is increased, the drain current

becomes zero

abruptly decreases

abruptly increases

remains constant

⇒ A 10 bit D/A converter gives a maximum output of 10.23 V. The resolution is

10 mV

20 mV

15 mV

25 mV

⇒ If V = 20 + j20, then log

_{e}(A) A is

3.342 +

*j*45

28.28 ∠45°

400 ∠45°

3.342 +

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⇒ In a ballistic galvanometer, a charge of 100 μC gives a first swing of 25°. The charge required to cause first swing of 50° is

200 μC

400 μC

50 μC

25 μC

⇒ Advanced low power Schottky is a part of

ECL family

CMOS family

TTL family

none of the above

⇒ The current through a 1 mH inductance is

*i*(

*t*) = 2.56 x 10

^{-2}- 4 x 10

^{3}

*t*for 2 ≤

*t*≤ 20 μ sec. The voltage across the inductor is

4

8

0

8 x 10

^{3}

⇒ For the transport lag G(

*j*ω) =

*e*

^{-jωT}, the polar plot is

a semi circle

a circle

a unit circle

none of the above

⇒ Thermistor is used in

temperature measurement

temperature control

high temperature alarm circuits of devices

all of the above

⇒ The FM broadcast band is from

550 to 1600 kHz

88 to 108 kHz

88 to 108 MHz

1600 kHz to 59.75 MHz

⇒ In a class C amplifier, full cycle conductor of the current is achieved by employing

tuned circuit

transformers

complementary pair

Push pull configuration

⇒ Thyristors connected in series need static and dynamic stabilizing circuits.

TRUE

FALSE

⇒ The combination of registers in 8085 is B-C, D-E, H-L only.

TRUE

FALSE

⇒ Norton's theorem reduces a two terminal network to

a constant current source and an impedance is parallel

a constant current source and an impedance in series

a constant voltage source and an impedance in parallel

a constant voltage source and an impedance in series

⇒ The compensator in the given figure

lag compensator

lead compensator

lag-lead compensator

none of the above

⇒ A voltage tripler circuit uses

2 diodes and 2 capacitors

3 diodes and 3 capacitors

2 diodes and 3 capacitors

3 diodes and 2 capacitors

⇒ Polarization of a wave is

direction of electric field

direction of magnetic field at some fixed point in space

either (a) or (b)

none of the above

⇒ The output

*y*(

*t*) of a continuous-time system

*S*for the input

*x*(

*t*) is given

S is linear and time-invariant

S is linear and time-varying

S is non-linear and time-invariant

S is non-linear and time-varying

⇒ Consider the voltage transfer characteristic of a standard CMOS inve

NMOS and PMOS triode

Both are saturation

NMOS saturated PMOS linear

None of these

⇒ The input to an op-amp integrating amplifier is a constant voltage. The output will be

a constant voltage

a sawtooth wave

a ramp

ac voltage

⇒ Consider the following statements about hybrid ring

- Ports 1 and 2 are decoupled.
- Port 3 and 4 are coupled.
- A signal entering either port 1 or 2 splits equally between ports 3 and 4.
- A signal entering either port 3 or 4 splits equally between ports 1 and 2.

1, 2, 3 and 4

1, 3 and 4

1 and 2

2, 3 and 4

⇒ Introducing a resistor in the emitter of a common amplifier stabilizes the d.c. operating point against variations in

only the temperature

only β of the transistor

both temperature and β

none of these

⇒

**Assertion (A):** A non-sinusoidal wave can be expressed in terms of sine waves of different frequencies which are multiples of the frequency of fundamental.

**Reason (R):** If negative half of a complex wave is a reproduction of the positive half, the even harmonics are absent.

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