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Q1. | The primary colours are |

A. | blue and green [Wrong Answer] |

B. | blue and red [Wrong Answer] |

C. | red and green [Wrong Answer] |

D. | blue, red and green [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ In the circuit of figure the switch is open for a long time, At

*t*= 0 the switch is closed. At

*t*= 0

^{+}the current supplied by batter

0.25

0.125

3.6 A

1.5 A

⇒ Consider the following statements:

- With increase in temperature Fermi-level tries to come in between the energy gap exactly at middle
- Mobility of electron in GaAs is very high compared to mobility of hole
- In LED, the light energy radiated due to recombination with the aid of traps.

1 and 2

1, 2 and 3

2 and 3

1 and 3

⇒ A linear diode detector uses RC filter. As modulation index increases the maximum permissible value of time constant RC

increases

decreases

remains constant

either (a) or (c)

⇒ If

*f*=0

X

_{L}= 0 and X

_{C}= 0

X

_{L}= ∞, X

_{C}= ∞

X

_{L}= 0 and X

_{C}= ∞

X

_{L}= ∞ and X

_{C}= 0

⇒ The pre-emphasis circuit is used

prior to modulation

after demodulation

for low frequency components of the signal

none of the above

⇒ A better SNR can be obtained in a PCM by

increasing sampling rate above Nyquist rate

decreasing the code bits

reducing channel bandwidth

increasing Quantization levels

⇒ A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage across each resistor is

half

doubled

increase by 4 times

no change

⇒ A low ratio of the A.C. load impedance of a diode detector results in

diagonal clipping

poor AGC operation

poor AF response

negative peak clipping

⇒ Current derating may be necessary when thyristors are operating in

series

parallel

series or parallel

none of the above

⇒ ∈

_{r}is determined by the atomic structure of the dielectric.

TRUE

FALSE

⇒ A transmission line of characteristic impedance

*z*

_{0}= 50 Ω. Phase Velocity = 2 x 10

^{8}m/sec, and length

*l*= 1 m is terminated by a load

*z*

_{1}= (30 -

*j*40) ohms. The input impedance of the line for a frequency of 100 MHz will be

(30 +

*j*x 40) Ω

(30 -

*j*40) Ω

(50 +

*j*x 40) Ω

(50 -

*j*40) Ω

⇒ Wave guides are pressurised above normal atmospheric pressure for

increasing the power handling capacity

improving conductivity of walls

preventing higher modes from propagation

varying the wave impedance

⇒ Consider the following statements as regards SAW filter

- The centre frequency is determined by the pitch of IDT comb shaped electrodes
- The response can be modified shaping the overlap of comb electrodes
- The response is maximum when acoustic wave has its wavelength equal to pitch
- When a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin
*x*)/*x*

1, 2, 3, 4

1, 2, 3 only

1, 2, 4 only

2, 3, 4 only

⇒ Spontaneous polarization occurs in ferroelectric materials.

TRUE

FALSE

⇒ Which camera tube has gamma of almost unity?

Vidicon

Plumbicon

New vicon

Saticon

⇒ In the given figure forward current wave has a magnitud

0.45 A

0.3 A

0.2 A

0.1 A

⇒ Consider the following statements about root locus

- The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion
- Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus
- The number of root locus branches terminating on infinity is always zero

1, 2 and 3

1 and 2 only

1 only

2 and 3 only

⇒

**Assertion (A):** In a full wave rectifier output the lowest ac component is at twice the input frequency

**Reason (R):** In a full wave rectifier, the output waveform consists of half sinusoids

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ In a full wave voltage doubler circuit, the input frequency is 560 Hz. The ripple frequency is

25 Hz

50 Hz

100 Hz

200 Hz

⇒

Match the following:

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

A. | Ratio of maximum energy stored to energy dissipated per cycle | 1. | Propagation constant |

B. | TEM mode is loss less medium | 2. | Cutoff frequency is zero |

C. | Ratio of frequency in radian to phase velocity of EM wave | 3. | Quality factor of cavity |

D. | TEM is the mode of lowest cutoff frequency | 4. | Cylindrical waveguide |

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

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

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

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

⇒ Divergence of curl A is

∇ . (∇ x A) = 1

∇ . (∇ x A) = 0

∇ . (∇ x A) = ∇

∇ . (∇ x A) = - ∞

⇒ A non-inverting voltage feedback amplifier is a

voltage amplifier

current amplifier

current to voltage converter

voltage to current converter

⇒ The number of spectral component when two sine wave of same frequency multiplied is

2

3

∞

4

⇒ Which is correct for a driving point function?

If the real part of a pole or zero is zero, that pole must be simple

If the real part of a pole or zero is zero, that pole or zero must be simple

If the real part of a zero is zero, that pole or zero must be simple

If the real part of a zero is zero that zero must be simple

⇒ In given figure a silicon diode is carrying a constant current of 1 mA. When the temperature of the diode is 20°C, V

_{D}is found to be 700 mV. If the temperature rises to 40°C, V

_{D}becomes approximately equa

747 mV

660 mV

680 mV

700 mV

⇒ The most commonly used transistor amplifier circuit is

CB

CC

CE

CE or CC

⇒ The receiver of a pulsed RADAR can detect signal power in the order of

1 W

0.1 W

10

^{-5}W

10

^{-12}W

⇒ When a lead acid cell is in fully charged condition the positive and negative plates are similar.

TRUE

FALSE

⇒ In all base driver amplifiers

ac collector voltage is 180° out of phase with ac base voltage

ac emitter voltage is 180° out of phase with ac base voltage

ac collector voltage is in phase with ac base voltage

none of the above

⇒ Bellows converts

pressure difference into displacement

pressure difference into voltage

displacement into pressure difference

either (a) or (c)