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Q1. | The use of thermocouple meters for ac measurement leads to a scale which is |

A. | linear [Wrong Answer] |

B. | square law [Correct Answer] |

C. | logarithmic [Wrong Answer] |

D. | exponential [Wrong Answer] |

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

⇒ The time constant of the circuit in figur

RC

2 RC

3 RC

5 RC

⇒ Denominator polynomial of a transfer function of certain network

stable

oscillatory

unstable

depends on numerator polynomial

⇒ If

*f*(

*t*) = -

*f*(-

*t*) satisfies Drichlet conditions, then

*f*(

*t*) can be expanded in Fourier series containing

only sine terms

only cosine terms

cosine terms and constant

sine terms and constant

⇒ Linear diode detector utilizes

linear portion of static characteristics of diode

linear portion of dynamic characteristic of diode

square law portion of dynamic characteristics of diode

rectification property of diode

⇒ For generating 1 MHz frequency signal, the most suitable circuit is

phase shift oscillator

weinbridge oscillator

colpitt's oscillator

clapp oscillator

⇒ The noise temperature of sky is about __________ °K.

100

273

0

30

⇒ A D.C. amplifier amplify

D.C. only

A.C. only

both A.C. and D.C.

none of the above.

⇒ The 2's complement representation of - 17 is

1110

1111

11110

10001

⇒ The lowest frequency used in satellite communications is __________ GHz.

0.8

3

18

30

⇒ Zip floppy has a capacity of

50 MB

500 MB

25 MB

100 MB or 250 MB

⇒ In Bode diagram (log magnitude plot) of the factor 1/(1 +

*j*ωT) in the transfer function the log magnitude for ω << 1/T can be approximated by

0 dB

20 log ωT dB

-20 log ωT dB

none of the above

⇒ Double spotting in a receiver is due to

poor sensitivity of RF amplifier

high gain of IF amplifier

inadequate image frequency rejection

all of the above

⇒ In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Z

_{in12/13 Ω13/12 Ω3 Ω4 Ω}

⇒ When

*p*-

*n*junction is reverse biased the holes in

*p*material move towards the junction and electrons in

*n*material move away from the junction.

TRUE

FALSE

⇒ What is the effect of cut in voltage on the wave form of output as compared to input in a semiconductor diode?

The duration of output waveform is less than 180°

Output voltage is less than input voltage

Output voltage is more than input voltage

Both (a) and (b)

⇒ A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are

1

2

3

3 or 4

⇒ In a driving point function poles and zeros must be conjugate if complex or imaginary.

TRUE

FALSE

⇒ A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 Ω, the remaining circuit being the same, the current in this branch will be

2.2 A

less than 2.2 A

2.2 A or less than 2.2 A

2.2 A or less or more than 2.2 A

⇒ A land line telemetry system is suitable for distance upto

about 1 km only

about 10 km only

about 100 km only

any of the above

⇒ In the circuit shown in the figure, the approximate voltage at the transist

base and emitter respectively are -8 V and -7.3 V

base and collector respectively are -8 V and -5 V

Collector and emitter respectively are -5 V and -7.3

base, emitter and collector respectively are -8 V, 7.3 V and -5 V

⇒ Figure shows the equivalent circuit of resistor. The resistor is non-inductive w

R = L/C

LR = L/C

L = CR

^{2}

C = LR

^{2}

⇒ Moving iron instrument can be used for ac only.

TRUE

FALSE

⇒ The application of magnetic field to superconducting material

increases transition temperature

decreases transition temperature

has no effect on transition temperature

may increase or decrease the transition temperature

⇒ In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is

30 V

60 V

15 V

10 V

⇒ Ferromagnetic materials exhibit

a linear B-H behaviour

a non-linear B-H behaviour

an exponential B-H behaviour

none of the above

⇒ When the emitter current of a transistor is changed by 1 mA, its collector current changes by 0.990 mA. The common base short circuit current gain a for the transistor is

0.99

1.01

1.001

0.99

⇒ Consider the following statements about polar plots

- Addition of a non-zero pole to a transfer function results in further rotation of polar plot through an angle of - 90° as ω → ∞
- Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of - 90°

Both are correct

Both are wrong

1 is correct and 2 is wrong

2 is correct and 1 is wrong

⇒ The function (sin

*x*)/

*x*

has a period 2p, decays with increasing

*x*and has zeros at

*n*p,

*n*= ± 1, ± 2

has a period p

has a period p/2

has a period 2p, decays with increasing

*x*, is an even function and has zeros at

*n*p,

*n*= ± 1, ± 2

⇒ The maximum usable frequency for the 'E' layer is 10 MHz.

TRUE

FALSE

⇒ The main advantage of TWT over klystron is

higher bandwidth

higher gain

higher frequency

higher output