80.

81.

82.

83.

84.

85.

An Analog to Digital Converter has a total conversion time of 125 ws. What can be the
allowable highest frequency of the analog input?

(A) 4kHz (B) 8kHz

(C) 2kHz 0) 11412

Ina Schmitt trigger, Vsat is + 25 V and the hysteresis width is 0.4 V. Feedback factor will be
ವಾ?)

(A) 0.002 (B) 0.016
(C) 0.008 (D) 0.004

Which of the following statements regarding sample and hold circuit is correct?
(A) Sample and hold circuit is must in digital to analog conversion

(B)_ The hold mode time of sample and hold circuit is less than the conversion time of
the converter

(0) 3 good Sample and hold circuit has high input impedance and low output
impedance

(D) All the above are correct

Which of the following statements are correct about IGBT?

൫ Flow of current in IGBT is due to electrons only.

Gi) IGBT is faster than BJT and MOSFET.

Gii) On state losses of IGBT are less than MOSFET.

(iv) It has high input impedance.
(^) Only (iii) and (iv) ൯) Only @ and (ii)
(C) Only Gi) and (ii) (D) Only (i) and (iv)

A half wave thyristor converter supplies a purely inductive load. The triggering angle of
thyristor is 120°. The extinction angle will be :

(ಸ) 180° (B) 200°
(C) 240° (D) 360°

Consider the following statements on triggering circuits for thyristors :
@ 2. triggering can be used for automatic control systems
Gi) The maximum firing angle is limited to 90° in R triggering circuit
Gii) UJT triggering can be used for feedback control systems
Which of the statements are correct?
(ಯ) Only (ii) and (iii) (B) Only (i) and (ii)
(C) Only @ and (iii) (D) All the above are correct

19 080/2023
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