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Q1. | In a CRO, the time base signal is applied to |

A. | X plates [Correct Answer] |

B. | Y plates [Wrong Answer] |

C. | either X or Y plates [Wrong Answer] |

D. | alternately X and Y plates [Wrong Answer] |

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

⇒ On which of the following effect do thermocouples work?

Thomson effect

Seeback effect

Peltier effect

Joule effect

⇒ Which of the following is not used as a microwave mixer or detector?

PIN diode

Crystal diode

Schottky barrier diode

Backward diode

⇒ A device has two resistances 300 Ω and 200 Ω respectively. The noise voltages due to these two resistance calculated separately are 5.38 μV and 4.38 μV respectively. When both of them are used together, the noise voltage will be

9.76 V

1 μV

23.56 μV

6.94 μV

⇒ Which of the following produces upper and lower side frequencies?

Microphone

Demodulator in a superheterodyne receiver

Modulator in a. radio transmitter

Oscillator in a receiver

⇒ In FM modulation pre-emphasis is done for

high frequency components

low frequency components

middle frequency components

both (a) and (b)

⇒ A flip flop is a

combinational circuit

memory element

arithmetic element

memory or arithmetic element

⇒ In an RC-coupled amplifier for improving the low frequency response

lower R

_{L}is provided

more bias is used

less gain is provided

higher C

_{C}is used

⇒ The best excited reflector from a wave guide is

horn

parabolic

biconical

corner

⇒ The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is

16

256

2

4

⇒ The power in the signal

*s*(

*t*) = 8 cos (20 p - p/2) + 4 sin (15 p

*t*) is

40

41

42

82

⇒ An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is

994 to 1014 μA

990 to 1020 μA

800 to 1200 μA

none of the above

⇒ In amplitude modulation the rms value of radio frequency voltage after 40% modulation is 60 mV. If modulation is 80% the rms value after modulation will be about

50 mV

60 mV

66 mV

80 mV

⇒ The probability density function of the envelope of narrow band noise is :

Uniform

Gaussian

Rayleigh

None

⇒ Industrial noise has the frequency range of

1 to 100 Hz

200 to 5000 Hz

above 200 MHz

1 to 600 MHz

⇒ If the iron core of a coil is removed so that it becomes an air cored coil, its inductance

will increase

will decrease

will remain the same

may increase or decrease

⇒ The useful magnetic flux obtainable from any closed surface is

unity

constant

both (a) and (b)

none of the above

⇒ The statement that the line integral of magnetic field about any closed path is exactly equal to the direct current enclosed by that path, is known as

Ampere's circuital law

Coulomb's law

Electrostatic's theory

None of the above

⇒ The filter circuit for feeding a wooffer has

an inductance in series and capacitance in parallel

a capacitance in series and an inductance in parallel

a resistance in series and an inductance in parallel

an inductance in series and a resistance in parallel

⇒ The first column of a Routh arra

2

3

4

5

⇒ The values of 2

^{5}in octal system is

40

20

400

200

⇒ The interface chip for 8086 and 16 bit ADC is

8259

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8253

8251

⇒ Intrinsic or characteristic impedance of free space has a value of

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73 ohm

73 ε ohm

120 ε ohm

⇒ Which of the following is an indirect way of generating FM?

Armstrong modulator

Varactor diode modulator

Reactance FET modulator

Reactance bipolar transistor

⇒ In auxiliary commutated chopper, the peak value of thyristor current is

equal to peak value of load current

equal to peak value of capacitor current

sum of peak value of load current and capacitor current

none of the above

⇒ The magnitude of transport lag factor is always zero.

TRUE

FALSE

⇒ The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z

4 bit adder giving P + Q

4 bit subtractor giving P - Q

4 bit subtractor giving Q - P

4 bit adder giving P + Q + R

⇒ Resistivity of metals consists of two parts, one part constant and the other temperature dependent.

TRUE

FALSE

⇒

Match the following:

List I (Operator) | List II (Description) | ||
---|---|---|---|

A. | ! = | 1. | Left shift |

B. | = = | 2. | Right Shift |

C. | < < | 3. | Equal to |

D. | > > | 4. | Not equal to |

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

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

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

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

⇒ The noise generated by a resistor depends upon

its resistance value

its operating temperature

both its resistance value and operating temperature

none of the above

⇒ For the logic circuit of the given figure the simplified Boolean expression

A ⊕ B

A + B

AB

A + B