90.

91.

92.

93.

94.

Consider the following statements :
0) Type Achopper is also called as step-down chopper.
Gi) Type B chopper is also called as step-up chopper.
(ii) Two quadrant type A chopper always have a positive voltage.
(iv) Two quadrant type B chopper always have a positive voltage.
Which of the statements are correct?
(A) Only (i), (ii) and (iii) ൯ Only (i), (ii) and (iv)
(C) Only (ii), Gii) and (iv) (D) All the above are correct

The chopper frequency of following circuit is 2000Hz. The on and off period of chopper is :
58

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(A) T,, =840.9 ws and Ty, =159.1us
)8( 1,» =170.45 ws and Ty, =79.55 45
(0 1, =340.9 ws and T,, =79.55 us

(0) T,,=170.45 ws and T,,=159.1yus

on

A Buck regulator, input voltage is 20V, time period is 10 seconds and duty ratio is 0.5. The
inductor and capacitors are 1 Henry and 1 Farad respectively. The peak-to-peak current
ripple of inductor will be :

(A) 20A (B) 40A

(0) 504 (D) 60A

Which of the following statements about SMPS is correct?
(A) SMPS provides good quality of efficient AC power supply
(B) SMPS is a two-stage conversion supply
(@ Insecond stage of SMPS devices used are MOSFET and IGBT
(D) All the above statements are correct

A single-phase controlled rectifier provides an output of 100 V from an AC source of 230V.
This rectifier is driving a separately excited DC motor with armature resistance 5 Q,
armature current 2A and back EMF constant 0.01V/rpm. The speed of motor is :

(^) 2200 rpm (8) 1100rpm

(C) 900 (D) 450 rpm

21 080/2023
[P.T.0.]