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Q1. | Which of the following is likely to be associated with FM radio broadcasting? |

A. | 90 Hz [Wrong Answer] |

B. | 90 kHz [Wrong Answer] |

C. | 900 kHz [Wrong Answer] |

D. | 90 MHz [Correct Answer] |

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

⇒ A monostable multivibrator has

no stable state

one stable state

two stable state

none of the above

⇒

Match the following:

List I (I/P - O/P relation) | List II (Property of the system) | ||
---|---|---|---|

A. | y(n) = x(n) | 1. | Nonlinear, non-causal |

B. | y(n) = x(n^{2}) | 2. | Linear, non casual |

C. | y(n) = x^{2}(-n) | 3. | Linear causal |

D. | y(n) = x^{2}(n) | 4. | Nonlinear causal |

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

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

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

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

⇒ The current through a resistance

*R*is shown in figure. The computed value of power

400 ± 0.42 W

400 ± 4.6 W

400 ± 8.85 W

400 ± 10.65 W

⇒ A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make

1200 revolutions

1800 revolutions

2100 revolutions

2400 revolutions

⇒ If a line is terminated in characteristic impedance Z

_{0}, the input impedance measured at the input will be

Z

_{0}

Z

_{0}/2

Zero

infinite

⇒ In a semiconductor material. The hole concentration is found to be 2 x 2.5 x 10

^{15}

*cm*

^{-3}. If mobility of carriers is 0.13

*m*

^{2}/

*v-s*. Then find the current density if electric field intensity is 3.62 x 10

^{-19}

7.6237 x 10

^{-4}A/

*cm*

^{2}

7.6237 x 10

^{-5}A/

*cm*

^{2}

7.6237 x 10

^{-3}A/

*cm*

^{2}

none of these

⇒ A TV picture is to be transmitted over a channel of 6 MH

*z*bandwidth at a 35 dB S/N ratio. The capacity of the channel is

50 M

*bps*

100 M

*bps*

36 M

*bps*

72 M

*bps*

⇒ Basically a potentiometer is a device for

comparing two votage

measuring a voltage

comparing two currents

measuring a current

⇒ If a function

*f*(

*t*) is an odd, function, its Fourier series

contains only sine terms

contains only cosine terms

contains a constant and sine terms

contains a constant and cosine

⇒

**Assertion (A):** Power is the rate at which energy is supplied.

**Reason (R):** Energy = VI*t*.

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

⇒ If the Q of a single stage single tuned amplifier is doubled, the bandwidth will

remain the same

become half

become double

become four times

⇒ 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

⇒ In an optional fiber the refractive index of cladding material should be

nearly 1

very low

less than that of core

more than that of core

⇒ If wave of critical frequency 30 MHz is departing at an angle of 60°, then the MUF is given to be

10 MHz

15 MHz

30 MHz

60 MHz

⇒ Nichrome is used for

overhead line wires

heater coils

lamp filaments

all of the above

⇒ Antenna efficiency of antenna is, if radiation resistance is 370 Ω and loss resistance is 100 Ω

0.8

0.87

0.78

0.2127

⇒ The addition of impurity in extrinsic semiconductor is about 1 part in 10

^{8}parts.

TRUE

FALSE

⇒ The number of valence electrons in pentavalent impurity is

5

4

3

1

⇒ The gate current required to turn on an SCR is

few amperes

a few mA

almost equal to anode current

about 50% of anode current

⇒ The radiation resistance of a doublet antenna of length dl is proportional to

δ

*l*

(δ

*l*)

^{2}

(δ

*l*)

^{3}

(δ

*l*)

^{05}

⇒ A dc network has an open circuit voltage of 5 V. When its terminals are short circuited a current of 5 A flows through the short circuit. If the short circuit is removed and a resistance of 1.5 Ω is connected across its terminals, the current will be

0.0416666666666667

0.0833333333333333

2.5 A

0.208333333333333

⇒ The gate width of a monostable multivibrator is given by

T = 1.1 RC

T = 0.693 RC

0.963 RC

T = 0.369 RC

⇒ Which of the following flip-flop is used as a latch?

J K flip-flop

R S flip-flop

T flip-flop

D flip-flop

⇒ Curl of gradient A is

∇ x (∇A) = 1

∇ x (∇A) = ∞

∇ x (∇A) = 0

∇ x (∇A) = - ∞

⇒ Consider the following time parameters

- Domain growth time constant.
- Transit time.
- Dielectric relaxation time in positive mobility regime.

1, 2, and 3

1 and 2 only

1 and 3 only

2 and 3 only

⇒ The inductance of a twin feeder used to connect antenna to TV receiver is about

0.2 μ H/m

0.6 μ H/m

1.6 μ H/m

10 μ H/m

⇒ Circuit switching, Message switching and Packet Switching Network belong to which of the following systems?

Computer communication system

Electromechanical communication system

PBX system

EPBX system

⇒ In the above case the total power in the modulated wave double sideband, suppressed carrier AM will be

112 W

400 W

415 W

512 W

⇒ The integral of a unit impulse is

a unit step function

a ramp function of slope 1

a pulse function of magnitude 1

none of the above

⇒ The device 'one shot' has

two stable states

one stable state

either 1 or 2 stable states

no stable state