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Q1. | Which one of the following is D/A conversion technique? |

A. | Successive approximation [Wrong Answer] |

B. | Weighted resistor [Correct Answer] |

C. | Dual slope [Wrong Answer] |

D. | Single slope [Wrong Answer] |

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

⇒

**Assertion (A):** The forward resistance of a *p*-*n* diode is not constant.

**Reason (R):** The *v*-*i* characteristics of *p*-*n* diode is non-linear.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

⇒ If the average power of radar transmitters is 2 kW and the peak power of the transmitter is 1000 kW, what will be the duty cycle?

0.002

0.02

0.001

0.01

⇒ An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant ε of the medium

electric potential V and electric field intensity E

displacement density D and displacement φ

electric field intensity E and displacement φ

electric potential V and displacement φ

⇒ A signal

*m*(

*t*) = 5 cos 2p 100

*t*frequency modulates a carrier. The resulting FM signal

0.1 kHz

6 kHz

3.2 kHz

100 kHz

⇒ The action of backward wave oscillator is similar to that of

klystron amplifier

reflex klystron oscillator

TWT

magnetron

⇒ VLF waves are sometimes used because

they penetrate the ionosphere easily

they are very reliable

they require low power

they require transmitting antennas of convenient sizes

⇒

Match the following:

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

A. | Very low response at very high frequencies | 1. | Low-pass system |

B. | Over shoot | 2. | Velocity damping |

C. | Synchro-control transformer output | 3. | Natural frequency |

4. | Phase-sensitive modulation | ||

5. | Damping ratio |

A-1, B-5, C-4

A-3, B-2, C-4

A-2, B-5, C-4

A-4, B-1, C-3

⇒ The conductivity of germanium increases by about 6 percent per degree increase in temperature.

TRUE

FALSE

⇒ A moving coil meter has a shunt of 0.02 Ω resistance. If coil resistance is 1000 Ω and a potential difference of 500 mV is required across it to cause full scale deflection, the current through shunt is

2.5 A

25 A

0.25 A

0.025 A

⇒ 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

⇒ The potential of suppressor grid (with respect to cathode) is usually

zero

negative

positive

zero or positive

⇒ A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at

*s*= - 2 and

*s*= - 4, and one simple zero at

*s*= - 1. A unit step

*u*(

*t*) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is

[exp (- 2

*t*) + exp (-4

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*) - exp (-

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*)]

*u*(

*t*)

[-0.5 exp (- 2

*t*) + 1.5 exp (-4

*t*)]

*u*(

*t*)

⇒ Binary multiplication 1 x 0 =

1

0

10

11

⇒ The strength of controlled voltage source depends on

value of current elsewhere in the circuit

value of voltage elsewhere in the circuit

value of current or voltage elsewhere in the circuit

none of the above

⇒ Consider the following applications

- Switch
- Attenuator
- Phase shifter
- Oscillator

1 2 3 and 4

1 2 and 3 only

1 and 2 only

2, 3 and 4 only

⇒ If a sample of germanium and a sample of silicon have the same impurity density and are kept at room temperature

both will have equal value of resistivity

both will have equal negative resistivity

resistivity of germanium will be higher than that of silicon

resistivity of silicon will be higher than that of germanium

⇒ The number of product terms in the minimized sum of product expression obtained through the following

*k*map is (where "

*d*" denotes don't care states)

2

3

4

5

⇒ In a material, the Fermi level is located between the centre of the forbidden band and the conduction band. Then what is that material?

A

*p*-type semiconductor

An

*n*-type semiconductor

An intrinsic semiconductor

An insulator

⇒

Match the following:

List I (F.T and F.S) | List II (Properties) | ||
---|---|---|---|

A. | Fourier Series | 1. | Discrete, Periodic |

B. | Fourier Transform | 2. | Continuous, Periodic |

C. | Discrete Time Fourier | 3. | Discrete aperiodic |

D. | Discrete Fourier Transform | 4. | Continuous, aperiodic |

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

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

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

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

⇒ A first order system will never be able to give a __________ response

- band stop
- band pass
- all pass

1, 2, 3 true

1 and 3 true, 2 false

1, 2 are true 3 is false

1, 2 are false, 3 is true

⇒ A signal

*m*(

*t*) amplitude modulates a carrier A

*cos ω*

_{c}*. The final signal will be*

_{c}t[A

_{c}*m*(

*t*)] cos ω

*]*

_{c}tA

*. [1 +*

_{c}*m*(

*t*)] cos ω

_{c}tA

*+ [*

_{c}*m*(

*t*)] cos ω

_{c}tA

*cos ω*

_{c}*+*

_{c}t*m*(

*t*)

⇒ Poles and zeros of a driving point function of a network are simple and alternate on

*j*ω axis. The network consists of

R and C

L and C

R and L

R, L and C

⇒ A signal having uniformly distributed amplitude in the interval (- V to + V) is to be encoded using PCM with uniform quantization. The signal to quantization noise ratio is determined by

dynamic range of signal

sampling rate

number of quantizing levels

power spectrum of signal

⇒ An instruction used to set the carry flag in a computer can be classified as

data transfer

arithmetic

Logical

program control

⇒ The output voltage of 5-bit D/A binary ladder that has a digital input of 11010 (Assuming 0 = 0 V and 1 = + 10 V) is

3.4375 V

6.0 V

8.125 V

8.6875 V

⇒ In 2's complement representation the number 11100101 represents the decimal number

37

-31

27

-27

⇒ The antenna most commonly used for TV broadcasting in the UHF band is

turnstile antenna

dipole antenna

yagi antenna

rhombic antenna

⇒ Induction wattmeter is an absolute instrument.

TRUE

FALSE

⇒ K maps can be drawn

only for 2 variables

only for 3 variables

only for 4 variables

for any number of variables

⇒ If V = 100 ∠ 16°, the (V) is

10 ∠ 32°

10 ∠ 8°

10 ∠ 16°

10 ∠ 4°