A single phase half wave rectifier is feeding a resistive load. When a = 0, dc o

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Question
A single phase half wave rectifier is feeding a resistive load. When a = 0, dc output voltage is 127 V. When a = 30�, the dc output voltage will be about
Options
A. 127 V
B. 120 V
C. 110 V
D. 100 V

Correct Answer

120 V

Explanation

Using Eq

A single phase half wave rectifier is feeding a resistive load. When a = 0, dc output voltage is 127 = 0.933.

Hence V_dc for 30� firing angle = 0.933 x 127 = ? 120 V.

6. The quiescent collector current I_C, and collector to emitter voltage V_CE in a CE connection are the values when
Options
A. ac signal is zero
B. ac signal is low
C. ac signal is negative
D. either (a) or (b)

7. Which of the following statement about the amplitude limiter is not valid?
Options
A. Leak type bias must be used
B. Output must be tuned
C. The circuit is always biased in class C, by virtue of the leak type bias
D. When the input increases past the threshold of limiting, the gain decreases to keep the output constant

8. Assertion (A): Helium, Argon and Neon are gaseous at room temperature.
Reason (R): The atoms in Helium, Argon and Neon are chemically extremely inactive.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

10. The law that (where K is thermal conductivity, ? is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as
Options
A. Lorentz law
B. Wiedemann Franz law
C. Curie Weiss law
D. Kittel law

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