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Q1. | While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ A microwave junction is matched at all ports if the S matrix

has all diagonal elements zero

has all diagonal elements equal but not zero

has all diagonal elements complex

is Hermitian

⇒ The satellites used for intercontinental communication are called

Comsat

Domsat

Marisat

Intelsat

⇒ Which chopper circuit operates in all the 4 quadrants?

A

C

D

E

⇒ If V

_{a0}, V

_{a1}, V

_{a2}are sequence components of V

_{a}and I

_{a0}, I

_{a1}, I

_{a2}are sequence components of I

_{a}, then total 3 phase power P is given by

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*}

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2})

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*})

⇒ The current gain of a BJT is

*g*

_{m}

*r*

_{0}

*g*

_{m}/

*r*

_{0}

*g*

_{m}

*r*

_{p}

*g*

_{m}/

*r*

_{p}

⇒ In figure what is value of I

_{C}if β

_{dc}= 100. Neglect V

_{BE5 mA5 μA10 mA10 μA}

⇒ A standard waveguide W R90 has inside wall dimensions of

*a*= 2.286 cm and

*b*= 1.016 cm. What is the cut-off wavelength for TE

_{01}mode?

4.572 cm

2.286 cm

2.032 cm

1.857 cm

⇒ The V

_{s}is give

8 V

13 V

1 V

4 V

⇒ The effective height of an antenna is slightly greater than physical height because

wave velocity in conductor is less than its velocity in free space

wave velocity in conductor is more than its velocity in free space

resistance of conductor is less than that of free space

none of the above

⇒ Consider the following expressions which indicate the step or impulse response of an initially relaxed system

- [5 - 4
*e*^{-2t}]*u*(*t*) - [
*e*^{-2t}+ 5]*u*(*t*) *d*(*t*) + 8*e*^{-2t}*u*(*t*)*d*(*t*) + 4*e*^{-2t}*u*(*t*)

1 and 3

1 and 4

2 and 4

2 and 3

⇒ A nickel cadmium cell is an alkaline cell.

TRUE

FALSE

⇒ For oscillations to starts, the loop gain A β of the oscillator must be initially

less than unity

0.5

1

more than unity

⇒ The useful operational life of INSAT-IB (launched in 1983) is expected to end by

1992-93

1991-92

1989-90

1993-94

⇒ Which of the following conditional statements is not valid in Pascal?

If A > = B then B : = C + D + X

If (N = 45) THEN X : = X + 2 ELSEX : = 0

If A < = B then A : = C * D

If (A > = B) X : Y else X : = Z

⇒ The relaxation time of electrons in a metal is of the order of

10

^{-6}secs

10

^{-10}secs

10

^{-14}secs

10

^{-20}secs

⇒ Conductivity σ, mobility μ and Hall coefficient K

_{H}are related as

μ = σK

_{H}

σ = μK

_{H}

K

_{H}= μσ

K

_{H}=(μσ)

^{1.1}

⇒ The ac bridge in figure is balanced. Z

_{1}= 100∠30°, Z

_{2}= 150∠0°, Z

_{3}= 250∠ - 40° Then Z

_{4375∠70° Ω375∠ - 70° Ω150∠0° Ω150∠20° Ω}

⇒ Consider the following statements about radar Beacon

- It is also called transponder.
- It includes pulse transmitter, receiver and antenna.
- It replies with full power even when the signal receives is weak.

All

1 and 2 only

2 and 3 only

2 only

⇒ For an ideal transformer

only Y parameter exist

only Z parameter

Z, Y both exist

neither Z parameter nor Y parameter exist

⇒ Magnitude Plot of a Composite signal

*x*(

*t*) =

*e*

^{2jt}+

*e*

^{3jt}is

half wave rectified sinusoidal

full wave rectified sinusoidal

exponentially increasing sinusoidal

exponentially decreasing sinusoidal

⇒ A presettable counter with 4 flip flops can start counting from

0

1000

any number from 0000 to 1000

any number from 0000 to 1111

⇒ Which of the following types of noise assumes greater importance at high frequencies?

Transit time noise

Shot noise

Impulse noise

Random noise

⇒ Consider the following rules about integer constant in C

- An integer constant must have at least one digit.
- An integer constant must not have a decimal point.
- An integer constant may be positive or negative.
- The default sign is positive.
- A maximum of one comma or blank is allowed.

All

1, 2, 3, 4 only

1, 2, 3, 5

2, 3, 4, 5 only

⇒ If

*f*(

*t*) = 1, F(

*j*ω) =

2p

p

2pδ (p)

pδ (ω)

⇒

**Assertion (A):** The 'do while' statement is used less frequently than the 'while' statement.

**Reason (R):** For most applications it is more natural to test for continuation of loop at the beginning than at the end of loop.

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 correct R is wrong

A is wrong R is correct

⇒ The following

*k*-map implem

BCD to Decimal Decoder

Decimal to BCD Encoder

1 of 10 Decoder

(a) and (c)

⇒ The correct hierarchy of operations for the operators & &, = = , = , * is

& & , = = , = , *

* , = = , & & , =

* , & & , = = , =

= , & & , = = , *

⇒ The selectivity of a radio receiver is

its ability to reject adjacent unwanted signals

its ability to amplify weak signals

the frequency at which it gives maximum amplification to signal.

its ability to suppress noise.

⇒ Race condition occurs in

synchronous circuit

asynchronous circuit

combinational circuit

all the Digital circuit

⇒ In frequency modulation noise can be further reduced by

increasing deviation

reducing deviation

reducing carrier frequency

increasing signal amplitude