106.  The primary function of a rectifier filter is to
A. minimise ac input variations
B. suppress odd harmonics in the rectifier output
C. stabilise dc level of th output voltage
D. remove ripples from the rectified output

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107. In a rectifier, larger the value of shunt capacitor filter
A. larger the p-p value of ripple voltage
B. larger the peak current in the recti-fying diode
C. longer the time that current pulse flows through the diode
D. smaller the dc voltage across the load

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108. Which rectifier requires four diodes?
A. half-wave voltage doubler
B. full-wave voltage doubler
C. full wave bridge circuit
D. voltage quadrupler

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109. In a LC filter, the ripple factor,
A. increases with the load current
B. increases with the load resistance
C. remains constant with the load current
D. has the lowest value

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110. The main reason why a bleeder resistor is used in a cIC power supply is that it
A. keeps the supply ON
B. improves voltage regulation
C. improves filtering action
D. both (b) and (c)

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111.  If, by mistake, ac source in a bridge rectifier is connected across the dc terminals, it will burn out and hence short
A. one
B. two
C. three
D. four

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112. The main job of a voltage regulator is to-provide a nearly?output voltage.
A. sinusoidal
B. constant
C. smooth
D. fluctuating

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