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Q1. | The gate current required to turn on an SCR is |

A. | few amperes [Wrong Answer] |

B. | a few mA [Correct Answer] |

C. | almost equal to anode current [Wrong Answer] |

D. | about 50% of anode current [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ Which of the following pairs are correctly matched?

- Brune's realisation : realisation with ideal transformer.
- Cauer realisation : ladder realisation.
- Bott Duffin realisation : with non ideal transformer.

1, 2 and 3

2 and 3

1 and 3

1 and 2

⇒ In a parallel resonant circuit, the circuit current at resonance is maximum.

TRUE

FALSE

⇒ Which of the following best represents the input impedance of an actual op-amp?

10 ohm

1 k ohm

1 M ohm

100 M ohm

⇒ The capacitors C

_{1}, C

_{3}, C

_{4}and C

_{5}have a capacitance of 4 μF each and the capacitor C

_{2}has a capacitance of 10 μF. The effective capacitance (in μF) between the points X and Y will

4 μF

6 μF

3 μF

8 μF

⇒ Kirchoff's laws are applicable to

steady state conditions only

transient conditions only

both steady state and transient condition

both steady state and transient condition but with some constraints

⇒ An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?

0.001

0.005

0.01

0.02

⇒ A dc network has an open circuit voltage of 5 V. When its terminals are short circuited a current of 5 A flows through the short circuit. If the short circuit is removed and a resistance of 1.5 Ω is connected across its terminals, the current will be

0.0416666666666667

0.0833333333333333

2.5 A

0.208333333333333

⇒ In a circular waveguide TE

_{21}mode has lowest cutoff frequency

TRUE

FALSE

⇒ Consider the following

- Generation of SSB signals
- Design of minimum phase type filters
- Representation of band pass signals

1 only

1, 2 and 3

1, 2 only

1 and 3

⇒ The trigonometric Fourier series for the waveform

*f(t)*shown below con

only cosine terms and zero value for the dc component

only cosine terms and a positive value for the dc component

only cosine terms and a negative value for the dc component

only sine terms and a negative for the dc component

⇒ If D, G and η denote the directly, power gain and efficiency of an antenna, then which of the following relation holds :

DGη = 1

η = DG

D = ηG

D = G/η

⇒ A capacitor whose capacitance C

_{t}= C

_{0}(1- cos ω

*t*) is fed by a sinusoidal voltage

*v*= V

_{0}sin ω

*t*. The equation for current

*i*is

ω C

_{0}V

_{0}cos ω

*t*

ω C

_{0}V

_{0}sin ω

*t*

ω C

_{0}V

_{0}(cos ω

*t*- cos

^{2}ω

*t*)

none of the above

⇒ A broadside array operating at 100 cm wavelength consist of 4 half-wave dipoles spaced 50 cm apart. Each element carries radio frequency current in the same phase and of magnitude 0.5 A. The radiated power will be

196 W

73 W

36.5 W

18.25 W

⇒ The reactance of coupling capacitor for AC signals in an amplifier, should be

as low as possible

as high as possible

neither low nor high

either low or high

⇒ A/D parallel converter is also called flash converter.

TRUE

FALSE

⇒ The characteristic equation of a feedback control system is given by

*s*

^{3}+ 5

*s*

^{2}+ (K + 6)

*s*+ K

(- 3, 0)

(- 2, 0)

(- 1, 0)

(2, 0)

⇒ One T state is precisely equal to one clock period.

TRUE

FALSE

⇒ Surface integral of the electric field intensity is

differential of volume flux

electrical charge

net flux emanating from the surface

none of the above

⇒ Pulse modulation is often used in

microwave band

FL band

telegraphy

telephony

⇒ An AM signal and a narrowband FM signal with identical carriers, modulating signals and modulation index of 0.1 are added together. The resultant signal can be closely approximated by

Broadband FM

SSB with carrier

DSB-SC

SSB without carrier

⇒

Match the following:

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

A. | FM | 1. | slope-overload |

B. | DM | 2. | μ law |

C. | PSK | 3. | Envelope detector |

D. | PCM | 4. | Capture effect |

5. | Hilbert transform | ||

6. | Matched filter. |

A-5, B-1, C-6, D-4

A-4, B-6, C-1, D-5

A-4, B-1, C-6, D-2

A-6, B-3, C-4, D-2

⇒ A capacitor can be represented by a capacitance C in parallel with a resistance R. For a good capacitor, the resistance R should be

very high

high

very low

low

⇒ A forward voltage of 9 V is applied to a diode in series with a 1 kΩ load resistor. The voltage across load resistor is zero. It indicates that

diode is short circuited

diode is open circuited

resistor is open circuited

diode is either short circuited or open circuited

⇒ Which of the following is true for RC impedance?

The lowest critical frequency is a pole

The lowest critical frequency is zero

The lowest critical frequency may be pole or zero

The lowest critical frequency is a pole but cannot be at

*s*= 0

⇒ Choose the correct statement/statements :

In case of an antenna, the antenna resistance and loss resistance are not two different quantities.

The loss resistance includes loss by eddy currents, improper earth connections, insulation leakages, etc., but not

*I*

^{2}

*R*losses.

Radiation resistance varies directly as square-root of frequency

None

⇒ Which of the following capabilities are available in a Universal Shift Register?

- Shift left
- Shift right
- Parallel load
- Serial add

2 and 4 only

1, 2 and 3

1, 2 and 4

1, 3 and 4

⇒ The analog signal

*m*(

*t*) is given below

*m*(

*t*) = 4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 300 p

*t*, the Nyquist sampling rate will be

1/100

1/200

1/300

1/600

⇒ Which of the following has highest resistivity?

Mica

Paraffin wax

Air

Mineral oil

⇒ Which one of the following is transferred locking electron device

*C*antenna?

BARITT diode

IMPATT diode

Gunn diode

Step recovery diode

⇒ Entropy gives

measure of Uncertainty

rate of Information

average information

probability of Information