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Q1. | Moving iron instrument can be used for ac only. |

A. | TRUE [Wrong Answer] |

B. | FALSE [Correct Answer] |

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

⇒ During amplitude modulation, the phase angle of the modulating voltage changes by

0°

45°

90°

180°

⇒ A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that

diode is short circuited

diode is open circuited

resistor is open circuited

diode is either short circuited or open circuited

⇒ If γ = (S

_{0}/N

_{0})/(S

_{i}/N

_{m}) where S

_{0}and S

_{1}are signal power output and signal power input and N

_{0}and N

_{m}are noise power output and noise power input, the value of γ for SSB-SC and DSB-SC amplitude modulated system respectively are

1 and 1

1 and 2

2 and 1

0.5 and 0.5

⇒ Consider the differential amplifier shown in figure. (Assume β is very hi

5 V

10 V

15 V

30 V

⇒ In FM, when the bandwidth is doubled, the signal to noise ratio improves by a factor of

2 dB

4 dB

6 dB

8 dB

⇒ In a single stage differential amplifier, the output offset voltage is mainly dependent on the mismatch of

V

_{BE}, I

_{B}and β

V

_{BE}and I

_{B}

I

_{B}and β

V

_{BE}and β

⇒ A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is

100

99

1.01

0.99

⇒ As per BIS, the number of accuracy classes of instrument is

5

6

7

8

⇒ In the spectrum of a FM wave

the carrier frequency cannot disappear

the carrier frequency disappears when the modulation index is large

the amplitude of any sideband depends on the modulation index

the total number of sidebands depends on the modulation index

⇒ In the given figure

*f*(

*t*) is an even funct

TRUE

FALSE

⇒

**Assertion (A):** Synchronous counter has higher speed of operation than ripple counter

**Reason (R):** Synchronous counter uses high speed flip flops.

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

⇒ The wave applied to X plates, for ohtaining trace of voltage wave, is

sawtooth wave

sinusoidal wave

rectangular wave

either (a) or (c)

⇒ For a symmetrical network

*h*

_{11}=

*h*

_{22}

*h*

_{12}=

*h*

_{21}

*h*

_{11}

*h*

_{22}-

*h*

_{12}

*h*

_{21}= 0

*h*

_{11}

*h*

_{22}-

*h*

_{12}

*h*

_{21}= 1

⇒ In a lead acid cell, the positive plate has spongy lead.

TRUE

FALSE

⇒ For the transport lag G(

*j*ω) =

*e*

^{-jωT}, the phase angle

is constant

varies linearly with frequency

varies linearly with low frequencies only

values as per square law

⇒ In orthogonal BFSK. the energy of information bearing term is :

the same as total transmitted energy

one half of total transmitted energy

one fourth of total transmitted energy

None

⇒ The Shannon-Hartley law

refers to noise

defines bandwidth

describes signalling rate

refers to distortion

⇒ A transistor may fail due to

open weld at the wire leads to the semi-conductor

short circuit caused by momentary overloads

overheating due to circuit failures

any of the above

⇒ Which of the following is λ/2 length?

Marconi

Hertz

Parabolic

Yagi-uda

⇒ An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is

0.1 V/mm

0.5 V/mm

1 V/mm

5 V/mm

⇒ In a colour TV receiver the bandwidth of RF amplifier is

exactly equal to channel width

a little less than channel width

a little more than channel width

either (a) or (b)

⇒ A signal

*f*(

*t*) = cos 10p

*t*+ 3 cos 4p

*t*is instantaneously sampled. The maximum allowable value of sampling interval T

_{s}in sec is

1 / 4 sec

1 / 8 sec

1 / 8p sec

1 / 10 sec

⇒ A logical expression Y = A + AB is equal to

Y = AB

Y = AB

Y = A + B

Y = A + B

⇒ Which is correct for a driving point function?

If the real part of a pole or zero is zero, that pole must be simple

If the real part of a pole or zero is zero, that pole or zero must be simple

If the real part of a zero is zero, that pole or zero must be simple

If the real part of a zero is zero that zero must be simple

⇒

Match the following:

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

A. | Title bar | 1. | Window menu |

B. | Control menu box | 2. | First row of window |

C. | start-button | 3. | box in title bar |

D. | Control | 4. | Button on mouse |

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

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

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

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

⇒ The derivative of unit step function is

unit impulse

ramp with slope 1

impulse

either (a) or (b)

⇒ Which of the following pulse modulation is analog?

PCM

Differential PCM

PWM

Delta

⇒ A 400 W carrier is amplitude modulated with

*m*= 0.75. If single side band suppressed carrier is used the total power in modulated wave is

400 W

512 W

112 W

56 W

⇒ In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be

1655 kHz

2110 kHz

745 kHz

910 kHz

⇒

Match the following:

List I (Theorems) | List II (Property of Network) | ||
---|---|---|---|

A. | Reciprocity | 1. | Impedance matching |

B. | Tellegen's | 2. | Bilateral |

C. | Superposition | 3. | ∑ V_{jk} I_{jk} = 0 |

D. | Maximum power transfer | 4. | Linear |

5. | Non linear |

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

A-1, B-2, C-3, D-5

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

A-2, B-3, C-5, D-1