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Q1. | A heterodyne frequency changer is called a |

A. | Modulator [Wrong Answer] |

B. | Mixer [Correct Answer] |

C. | Demodulator [Wrong Answer] |

D. | Frequency translator [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .

source, sink

sink, source

positive value, negative value

negative value, positive value

⇒ A material has conductivity of 10

^{5}mho/m and permeability of 4p x 10

^{-7}H/m. The skin depth at 9 GHz is

1.678 μm

26 μm

17 μm

32.32 μm

⇒ When the gate terminal of MOSFET is positive, it is said to operate in

depletion mode

conduction mode

enhancement mode

none of the above

⇒ If the inputs to a 2 input XOR gate are high then, the output is high.

TRUE

FALSE

⇒ A shadow zone does not receive any space wave

TRUE

FALSE

⇒ In 8085 the instruction

`MOV A, M`

is an example ofDirect addressing

Immediate addressing

Register addressing

Register indirect addressing

⇒ In a shift left register, shifting a bit by one bit means

division by 2

multiplication by 2

subtraction of 2

None of the above

⇒ An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ and output resistance of 2.5 kΩ. The input resistance of the current shunt -

*ve*feedback amplifier using the above amplifier with a feedback factor of 0.2 is

1/11 kΩ

1/5 kΩ

5 kW

11 kW

⇒ The units of resistivity are ohm-metre.

TRUE

FALSE

⇒ Which one of following is correct condition to check the stability of sysytem in terms of impulse response?

Σ(

*x*(

*n*)) < ∞

Σ

*x*(

*n*) < 0

Σ

*x*(

*n*) = 0

Σ

*x*(

*n*) = ∞

⇒ Frequency response approach is a simple approach to control system design.

TRUE

FALSE

⇒ Top loading in an antenna increases

effective height

beam width

input capacitance

bandwidth

⇒

Match the following:

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

A. | Fourier transform of a Gaussian function | 1. | Gaussian function |

B. | Convolution of a rectangular pulse with itself | 2. | Rectangular pulse |

C. | Current through inductor for step input voltage | 3. | Triangular pulse |

4. | Ramp function | ||

5. | Zero |

A-1, B-2, C-3

A-2, B-4, C-5

A-1, B-3, C-4

A-2, B-3, C-5

⇒ Good smoothing factor of a coil depends on

inductance of the coil

terminal voltage

cross-sectional area of the wire of the coil

property of the wire of the coil

⇒ Six sets of electromagnetic waves are given bel

VLF, LF, MF, HF, VHF, UHF

LF, VLF, MF, HF, VHF, VHF

LF, VLF, HF, MF, VHF, UHF

VHF, VLF, HF, MF, LF, UHF

⇒ The decoder for PAL system is

similar to NTSC decoder

similar to NTSC decoder supplemented by 64 ms delay line

similar to NTSC decoder supplemented by 64 ms delay line and an electronic commutator

either (b) or (c)

⇒ The advantage of FET over BJT is

high input impedance

lower noise

no thermal runaway

all of the above

⇒ The stud in a stud mounted SCR acts as

anode

cathode

gate

anode or cathode

⇒ In INHIBIT operation

output is 1 when both inputs are 0

output is 0 when blocking input is 1

output is 0 when blocking input is 0

output is 1 when blocking input is either 0 or 1

⇒ Characteristic wave impedance is

ε/μ

(ε/μ)

^{1/2}

E

_{x}/H

_{y}

H

_{y}/E

_{x}

⇒ A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is

25 Ω

50 Ω

225 Ω

250 Ω

⇒ If N bits are lumped together to get an N-bit symbol, the possible number of symbols is

2

^{N}

2

^{N - 1}

2

^{N - 2}

2

^{N - 4}

⇒ The counter shown in the given figure

Synchronous

Johnson

Ring

None of the above

⇒ The equivalent unit of joule is

newton

newton-meter

newton-metre

^{2}

none of the above

⇒ The self bias provides

stable Q point

large voltage gain

high input impedance

high base current

⇒

Match the following:

List I (Characteristics) | List II (Decrease) | ||
---|---|---|---|

A. | Paramagnetic | 1. | All dipoles are aligned is one preferred direction |

B. | Ferromagnetic | 2. | Half the dipoles are aligned in opposite direction and have equal magnitude |

C. | Antiferromagnetic | 3. | Half the dipoles (with equal magnitudes) are aligned in opposite direction to the other half having equal but lower magnitude |

D. | Ferrimagnetic | 4. | All dipoles have equal magnitude but are randomly oriented |

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

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

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

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

⇒

*f*

_{unity}of an op-amp is about 1 kHz.

TRUE

FALSE

⇒ Gold is often diffused into silicon PN junction devices to

increase the recombination rate

reduce the recombination rate

make silicon a direct gap semiconductor

make silicon semimetal

⇒ Pre-emphasis and De-emphasis is done by using R-C circuit.

TRUE

FALSE

⇒ In a low power factor wattmeter, the resistance of pressure coil is more than in ordinary wattmeter.

TRUE

FALSE