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Q1. | In a turnstile antenna two-half wave resonant wire radiators are placed at 90° to each other in the same plane and are excited |

A. | in phase [Wrong Answer] |

B. | in phase opposition [Wrong Answer] |

C. | 90° out of phase with each other [Correct Answer] |

D. | 45° out of phase with each other [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 :**

⇒ If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is

1 ohms

10 ohms

25 ohms

100 ohms

⇒ In hexadecimal number system, A is equal to decimal number

10

11

17

18

⇒ The attraction between the nucleus and valence electron of copper atom is

zero

weak

strong

either zero or strong

⇒

Match the following:

List I (Component) | List II (Dominant TE mode) | ||
---|---|---|---|

A. | Rectangular wave guide | 1. | TE_{101} |

B. | Circular waveguide | 2. | TE_{10} |

C. | Rectangular cavity | 3. | TE_{111} |

4. | TE_{11} |

A-4, B-2, C-1

A-2, B-1, C-3

A-3, B-4, C-1

A-2, B-3, C-1

⇒ In a D-type latch EN = 1, D = 1, the O/P is

1

0

don't care

blocked

⇒ A magnetic circuit has an iron length of 20 cm and air gap length 0.1 cm. If μ

_{r}= 200 then

mmf for iron and air gap are equal

mmf for iron is much less than that for air gap

mmf for iron is much more than that for air gap

either (a) or (c)

⇒ Choose the correct option

- Transit period is the time between two steady state
- Transient Response is the response due to internal energy stored in circuit
- Transit response is also called natural response
- Transit response arises due to presence of C and L in the circuit
- Transit is due to R, L, C in the circuit

4, 3, 2 , 1

5, 4, 3, 2

5, 4, 3, 1

5, 1, 4

⇒ Which camera tube has highest sensitivity and very wide spectral response?

Vidicon

Plumbicon

New vicon

Saticon

⇒ For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is

100 Ω

50 Ω

25 Ω

10 Ω

⇒ Consider the sequence

*x(n)*whose fourier transform X(

*e*) is depicted for - p ≤ ω ≤ p as shown in fig

^{jω}1 - True, 2 - True, 3 - True, 4 - True

1 - False, 2 - True, 3 - False, 4 - True

1 - True, 2 - False, 3 - True, 4 - False

1 - False, 2 - False, 3 - False, 4 - True

⇒ A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is

0.0089159

0.089159

0.89159

8.9159

⇒ If

*q*is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is

0.5

*q*ωR

0.5

*q*

^{2}ω

^{2}R

^{2}

0.5

*q*ωR

^{2}

0.5

*q*ω

^{2}R

⇒ An SR flip flop can be built using NOR gates or NAND gates.

TRUE

FALSE

⇒ Which of the following transformers has low primary current?

Current transformer

Potential transformer

Distribution transformer

Both (a) and (b)

⇒ The relative permeability of a ferromagnetic material is

1

less than 1

about 10

1000 or more

⇒ To ensure that only dominant mode TE

_{10}is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are

about 25% above

*f*

*for TE*

_{c}_{10}and 5% below

*f*

*for TE*

_{c}_{20}mode respectively

about 50% above

*f*

*for TE*

_{c}_{10}and 25% below

*f*

*for TE*

_{c}_{20}mode respectively

about 25% above

*f*

*for TE*

_{c}_{10}and 25% below

*f*

*for TE*

_{c}_{20}mode respectively

none of the above

⇒ In a series R-L circuit when excited by a 1 volt battery the current is 1 -

*e*

^{-t}. If it is excited by a source 2 sin

*t*, the current will be

2 sin (

*t*- 45°) +

*e*

^{-t}

2 sin (

*t*+ 45°) +

*e*

^{-t}

sin (

*t*- 45°) +

*e*

^{-t}

sin (

*t*+ 45°) +

*e*

^{-t}

⇒ When one operand is real and one integer in Pascal, which of the following operations are not allowed?

+ and -

*

/

Div and Mod

⇒ 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

⇒ A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10

31

*v*

32

*v*

insufficient data

none of these

⇒ A 2 bit binary multiplier can be implemented using

2 inputs ANDs only

2 inputs XORs and 4 input AND gates only

Two 2 inputs NORs and one XNOR gate

XOR gates and shift registers

⇒ A capacitance transducer can be used to measure

thickness of sheet

displacement

level of fluids

all of the above

⇒ An electron for which

*l*= 0 has zero orbital magnetic dipole moment.

TRUE

FALSE

⇒ In a rectangular waveguide cutoff wavelength for TE

_{10 }mode is 8 cm. Then cutoff wavelength for TE

_{20}mode is

8 cm

6 cm

4 cm

2 cm

⇒ A waveguide operated below cut off frequency can be used as

phase shifter

an attenuator

an isolator

none

⇒ In the absence of noise, if C is channel capacity in bits/s, δ

*f*is channel bandwidth in Hz and N is number of coding levels. Then

C = log

_{2}N

C = (δ

*f*) log

_{2}N

C = 2 (δ

*f*) log

_{2}N

C = 0.5 (δ

*f*) log

_{2}N

⇒ For a logic fa

V

_{IH}> V

_{0H}> V

_{IL}> V

_{0L}

V

_{OH}> V

_{IH}> V

_{IL}> V

_{0L}

V

_{IH}> V

_{OH}> V

_{OL}> V

_{IL}

V

_{OH}> V

_{IH}> V

_{OL}> V

_{IL}

⇒ The numbers of accelerating anodes in a CRO is

1

2

3

4

⇒

**Assertion (A):** In totem pole output the output impedance is low.

**Reason (R):** TTL gate with active pull up should not be used in wired AND connection.

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 resistance of human body is about

5000 Ω

2000 Ω

1000 Ω

200 Ω