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Q1. | Radar principle is used in |

A. | detection of aircraft [Wrong Answer] |

B. | burglar alarms [Wrong Answer] |

C. | garage door openers [Wrong Answer] |

D. | all of the above [Correct Answer] |

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

⇒ If

*e*is the charge of an electron, R is the radius of its orbit and ω is the angular velocity of electron, the magnetic dipole moment μ

_{m}of the orbit is |μ

_{m}| =

*e*ωR

^{2}.

TRUE

FALSE

⇒ FIR filter Passes __________ Phase.

non-linear phase

linear phase

variable phase

none

⇒ A dielectric of relative permittivity ∈

_{r}is subjected to a homogeneous electric field E. The dipole moment P per unit volume is given by

P = constant

P = ∈

_{0}E

P = ∈

_{0}(∈

_{r}- 1) E

P = ∈

_{r}E

⇒ Mark the false statement:

since wave-shape of a digital signal is unimportant, linear amplifiers are not required

the precise amplitude of a digital signal is also unimportant provided two voltage levels (0 and 1) are quite different

the leading and trailing edges of a digital signal need not be sharp

actual digital waves have rise and fall times of the order of a few nano seconds

⇒ When R and L are connected in parallel, R > |Z|.

TRUE

FALSE

⇒ The poles and zeros of a positive real function

may lie any where in

*s*plane

may have positive or negative real part

must occur in conjugate pair

must have either negative or zero real part

⇒

Match the following:

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

A. | Serial Binary adder | 1. | (2n - 1)t_{pd} |

B. | Ripple carry adder | 2. | (n - 1)t_{pd} |

C. | Carry look ahead binary adder | 3. | Operation time independent of size |

4. | 6t for 4 bit carry look ahead adder_{pd} |

A-2, B-1, C-3

A-2, B-1, C-4

A-1, B-2, C-4

A-1, B-2, C-3

⇒ Ultra high frequency oscillators work in the range

20 Hz to 20 kHz

1 kHz to 30 kHz

30 kHz to 30 MHz

above 30 MHz

⇒ Which of the following statements is false?

Push pull signals are equal and opposite in phase

Class AB operation cannot be used for a push pull audio power output phase

A push pull output transformer has a centre-tapped primary

All of the above

⇒ A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR

is forward biased

is reverse biased

may be forward biased or reverse biased

forward biased initially but reverse biased afterwards

⇒ In free space

phase velocity is greater than light velocity

phase velocity is equal to group velocity

phase velocity is equal to light velocity

Both (b) and (c)

⇒ Covalent bond energy in Germanium is approximately

3.8 eV

4.7 eV

7.4 eV

12.5 eV

⇒ To increase Q factor of a coil, the wire should be

long

thin

thick

long and thin

⇒ For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles

TRUE

FALSE

⇒ For a 4096 x 8 EPROM, the number of address lines is

14

12

10

8

⇒ In a decimal digital computer, the number 127 is stored

1111111

0001 00100111

10001

11000111

⇒ Two impedances 10 -

*j*10 and 10 +

*j*10 are connected in parallel. Their combined impedance is

5 +

*j*5

5 -

*j*5

10 +

*j*0

20 -

*j*10

⇒ Race condition always arises in

synchronous circuit

asynchronous circuit

combinational circuit

digital circuit

⇒ Fourier analysis indicate that a square wave can be represented as

a fundamental sine wave and odd harmonics

a fundamental sine wave and even harmonics

a fundamental sine wave and harmonics

fundamental and subharmonic sine waves

⇒ The diagram to show distance time history of electrons in klystron amplifier is called

apple gate diagram

asynchronous diagram

bunching diagram

velocity modulation diagram

⇒ Consider the following:

- Distortion
- Gain
- Bias stabilization
- Sensitivity
- Frequency response

1, 2 and 3

1, 3 and 5

2, 3 and 4

4 and 5

⇒ Triatics are

small height antenna directly mounted on jeeps, ships, etc.

the towers or masts which are used as radiators

the towers or masts which are not used as radiators

supports for antenna conductors.

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

_{in12/13 Ω13/12 Ω3 Ω4 Ω}

⇒ The percentage limiting error in an instrument reading 8.3 V and having guaranteed accuracy of 1% of the full scale reading and range of 0-150 V is

0.0181

0.00181

0.181

0.000018

⇒ Which of the following is used in temperature alarm circuits?

Thermistor

Photoconductor

Transistor

Varistor

⇒ The equation D = ∈

_{0}∈

_{r}E refers only to isotropic materials.

TRUE

FALSE

⇒ The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be

260 V

252 V

250 V

248 V

⇒ The number of lobes on each side of a 31 resonant antenna will be

2

3

4

6

⇒ Consider a silicon p-n junction at room temperature having the following paramet

is 0.70V

is 0.76V

is 0.82V

cannot be estimated from the data given

⇒ The number of flip-flops needed to divide the input frequency by 32 is

2

4

5

16