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Q1. | The average load current supplied by a thyristor depends on |

A. | firing angle [Correct Answer] |

B. | firing frequency [Wrong Answer] |

C. | magnitude of gate current [Wrong Answer] |

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

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

⇒ In an ideal diode there is no breakdown, no __________ current, and no forward __________ drop.

reverse, voltage

forward, current

forward, voltage

reverse, current

⇒ A clamper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

⇒ The resistance of resistance strain gauge is about

5 Ω

50 Ω

120 Ω

0.5 Ω

⇒ The units of the spectrum obtained be Fourier transforming the covariance function of a stationery Stochastic Process is

Power per Hz

energy per Hz

Power per sec

Energy per second

⇒ In the DRAM cell in the figure is the V

_{t}of the NMOSFET is 1 V. For the following three combinations of WL and BL volta

5 V, 3 V, 7 V

4 V, 3 V, 4 V

5 V, 5 V, 5 V

4 V, 4 V, 4 V

⇒ Evaluate the value of 2 [

*u*(

*t*- 1) -

*u*(1 - 2

*t*)] (

*u*(

*t*+ 1) +

*u*(

*t*)) at

*t*= 3 sec.

0

4

∞

1

⇒ A current of 1 A in the coil of an iron cored electromagnet causes B = 0.5T. If current is 2A, B =

0.5 T

1 T

1 T or more

1 T or less

⇒ A lag compensator provides attenuation in

very low frequency range

low frequency range

high frequency range

none of the above

⇒ A flip-flop circuit is

monostable

bistable

multistable

unstable

⇒ If V

_{a0}, V

_{a1}, V

_{a2}are sequence components of V

_{a}and I

_{a0}, I

_{a1}, I

_{a2}are sequence components of I

_{a}, then total 3 phase power P is given by

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*}

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2})

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*})

⇒ The S (sign) flag is set when the contents of accumulator become negative during an operation.

TRUE

FALSE

⇒ The relationship of hysteresis loss to maximum flux density was first determined by

C. Steinmetz

G.R. Kirchoff

Mr. Laplace

Mr. Ampere

⇒ In a digital voltmeter the oscillator frequency is 400 kHz and the ramp voltage falls from 8 V to 0 V in 20 ms. What is the number of pulses counted by the counter?

800

2000

4000

8000

⇒ In a CE amplifier, the collector resistance is 6 kΩ and load resistance is 3 kΩ. The ac load resistance is

9 kΩ

6 kΩ

3 kΩ

2 kΩ

⇒ High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to

reduce dc resistance

reduce ac resistance

increase dc resistance

increase ac resistance

⇒ In which mode of rectangular waveguide are all field components zero?

TM

_{00}

TM

_{11}

TM

_{01}

TM

_{10}

⇒ Which of the following real expressions is correct in Pascal?

`- Z + P * X `

`(X + Y) (A + B)`

`Z ** M `

`Z P * M`

⇒ A high pulse repetition frequency in a radar

increases the maximum range

decreases the maximum range

has no effect on the maximum range

either (a) or (b) depending on other factors

⇒ When thyristors are connected in series and parallel, it may be necessary to have :

current derating

voltage derating

both current and voltage derating

none of the above

⇒ An op-amp uses

RC coupling

direct coupling

transformer coupling

either (b) or (c)

⇒ Refraction of electromagnetic waves occurs when they

pass through a small slot in a conducting plane

pass into a medium of different dielectric constant

are polarized at right angles to the direction of propagation

encounter a perfectly conduction surface

⇒ A crowbar circuit is generally needed for protection under fault conditions.

TRUE

FALSE

⇒ In an intrinsic semiconductor, at a given temperature T

the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination

the number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination

the number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

any of the above

⇒ Dish antennas are

loop

helical

parabolic

conical

⇒ Consider the following statements as regards communication receiver

- Variable sensitivity is used to eliminate selective fading
- A product demodulator can be used to receive Morse code
- The noise limiter cuts off receiver output during a noise pulse
- Double conversion is used to improve image rejection

1, 2, 3, 4

1, 2, 3

2, 3, 4

1, 3, 4

⇒ A lag compensator is essentially a

low pass filter

high pass filter

band pass filter

either (a) or (b)

⇒ For the polynomial

*P*(

*s*) =

*s*

^{5}+

*s*

^{4}+ 2

*s*

^{3}+ 2

*s*

^{2}+ 3

*s*+ 15 The number of roots which lie in the right half of the

*s*plane is :

4

2

3

1

⇒ In a phase discriminator

*f*, is the IF to which primary circuit is tuned. Consider the following statements: The primary and secondary voltages are

_{c}- exactly 90° out of phase when input frequency is
*f*_{c} - more than 90° out of phase when input frequency is higher than
*f*_{c} - less than 90° out of phase when input frequency is lower than
*f*_{c}

1 only

1 and 2

1, 2 and 3

2 and 3

⇒ A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10

31

*v*

32

*v*

insufficient data

none of these

⇒ The derating factor, for ambient temperature higher than specified, for a transistor is about

2.5 mW/°C

0.5 mW/°C

10 mW/°C

20 mW/°C