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Q1. | To turn off an SCR, it is necessary to reduce its current to less than : |

A. | trigger current [Wrong Answer] |

B. | holding current [Correct Answer] |

C. | breakover current [Wrong Answer] |

D. | none of the above [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 :**

⇒ In phase shift keying the input signal is

*s*

_{t}(

*t*) = A cos ω

_{0}

*t*and

*s*

_{2}(

*t*) = - A cos ω

_{0}

*t*

*s*

_{1}(

*t*) =

*s*

_{2}(

*t*) = A cos ω

_{0}

*t*

*s*

_{1}(

*t*) = A cos ω

_{0}

*t*and

*s*

_{2}(

*t*) = A cos (ω

_{0}

*t*+ p/2)

*s*

_{1}(

*t*) = A cos ω

_{0}

*t*and

*s*

_{2}(

*t*) = - A (cos ω

_{0}

*t*+ p/2)

⇒ An audio signal of FM radio station is sampled at a rate of 15% above the Nyquist rate. Signal is sampled in 512 levels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

77 K bits/sec

92 K bits/sec

84.8 K bits/sec

82.8 K bits/sec

⇒ Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is

0.25

0.5

0.75

1

⇒ Brownian motion is

random emission of electrons in vacuum tubes

thermal motion of electrons in a resistance

random diffusion of holes and electrons in semi- conductors

both (b) and (c)

⇒ A 4 input AND gate is equivalent to

4 switches in parallel

2 switches in series and 2 in parallel

three switches in parallel and one in series

4 switches in series

⇒ A 10 MHz square wave clocks 5 bit ripple counter. The frequency of the 3rd FF output is

2 MHz

1.25 MHz

50 MHz

615 kHz

⇒ Consider the following features of 'structures' in C?

- The values of a structure variable can be assigned to another structure variable of the same type using the assignment operator.
- One structure can be nested within another structure.
- A variable structure can also be passed to a function.

All

1 and 2 only

1 and 3 only

2 and 3 only

⇒ The equivalent resistance between terminals

*x*and

*y*figur

150 Ω

45 Ω

55 Ω

35 Ω

⇒ The logic circuit of the given figure realizes the func

(A + B + C)(D)(E)

(A + B + C) (D)(E)

(A + B = C) (D)(E)

(A + B + C)(D)(E)

⇒ The conductivity of an intrinsic semiconductor is (symbols have the usual meanings).

generally less than that a doped semiconductor

σ

_{i}=

*en*

_{i}(μ

_{n}- μ

_{p})

σ

_{i}=

*en*

_{i}(μ

_{n}+ μ

_{p})

σ

_{i}=

*n*

_{i}(μ

_{n}- μ

_{p})

⇒ A scheme shown below is to generate a wide band FM modulate sign

88 MHz, 112 MHz

96 MHz, 104 MHz

92 MHz, 108 MHz

90 MHz, 110 MHz

⇒ Consider the sequence

*x*[

*n*] = [- 4 -

*j*5 1 + J2 4]

[- 4 - J2.5 J2 4 -

*J*2.5]

[- J2.5 1 J2.5]

[- J5 J2 0]

[-

*x*1 4]

⇒ It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude

will increase

will decrease

will remain constant

will reduce to negligible value

⇒ For the logic circuit of the given figure the simplified Boolean expression

A ⊕ B

A + B

AB

A + B

⇒ The induced magnetic dipole moment has a direction opposite to the applied magnetic field.

TRUE

FALSE

⇒ McMurray Bedford full bridge inverter uses

natural commutation

auxiliary commutation

complementary commutation

any of the above

⇒ In AM receiver the oscillator frequency is

always equal to signal frequency

always equal to 455 kHz

always higher than signal frequency

always lower than signal frequency

⇒ The stationary process has

all the statistical Properties dependent on time.

all the statistical Properties independent of time.

aime average is equal to ensemble average.

zero variance.

⇒ 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

⇒ Figure shows an RC circuit. The magnitude plot V

_{2}/V

_{1will rise exponentially to R2/(R1 + R2) as ω → ∞will rise linearly to R2/(R1 + R2) as ω → ∞will decrease to zero as ω → ∞will rise 1 at ω = 0 and then decrease as ω → ∞}

⇒ A uniform wave have components

in the perpendicular direction E existing while H is zero

in the direction of propagation E existing while H is zero

E and H are zero in direction perpendicular to direction of propagation

E and H existing only in direction perpendicular to direction of propagation

⇒ The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency.

TRUE

FALSE

⇒ E

_{g}is the band gap, A is pre-factor,

*k*is Boltzmann constant? Which one of the following is the remaining grade of paper used in paper capacitor, besides the other two grade of paper-low and extra low loss?

Strong dielectric

Regular

Rough

High loss

⇒ The value of VSWR is taken as ∞ when the line is

short-circuited

open-circuited

terminated with full load

terminated with load equal to the characteristic impedance of the load

⇒ Consider the following statements about conditions that make a metal semiconductor contact rectifying

- N type semiconductor with work function φ
_{s}more than work function φ_{M}of metal - N type semiconductor with work function φ
_{s}less than work function φ_{M}of metal - P type semiconductor with work function φ
_{s}more than work function φ_{M}of metal - P type semiconductor with work function φ
_{s}less than work function φ_{M}of metal.

1 and 3 are correct

2 and 3 are correct

1 and 4 are correct

2 and 4 are correct

⇒ Binary 1000 will be the result of which of the following?

Binary 1000 - 100

Binary 1011 - 1111

Binary 1111 - 111

Binary 11111 - 1111

⇒ Two coil have their axis perpendicular to each other. The coefficient of coupling

*k*is

1

0.5

more than 0 but less than 1

0

⇒ A land line telemetry system is suitable for distance upto

about 1 km only

about 10 km only

about 100 km only

any of the above

⇒ In a class C operation V

_{CC}= 30 V and V

_{CE(sat)}= 2 V. The efficiency is

0.9375

0.88

0.0666

0.0333

⇒ A two stage amplifier has an upper cutoff frequency of 2 MHz and a lower cutoff frequency of 2 MHz and a lower cut off frequency of 30 Hz. If both stages are similar, their individual upper and lower cut off frequencies respectively are

4 MHz and 60 MHz

3 MHz and 20 Hz

3 MHz and 60 Hz

4 MHz and 20 Hz