Basic Electronics2.docx

http://books.google.co.in/books?id=WncCTdLXyfQC&pg=PA132&source=gbs_toc_r&cad=4#v=onepage &q&f=false

Basic Electronics

Sample paper 3

1. Thermal Run away is not possible in FET because of the absence of A. minority careers B. Transconductance C. Channel D. none Ans: A

2. The popular IC 741 is A. Voltage regulator B. Comparator C. Operational amplifier D. Timer Ans: C

3. What is the approximate peak-to-peak voltage of a 2 VRMS sine wave? A. 2.0 Vp-p B. 2.8 Vp-p C. 4.0 Vp-p

D. 5.6 Vp-p Ans: D

4. In a simple DC circuit with a constant voltage, where the resistance increases current will: A. decrease. B. stop. C. increase. D. remain constant. Ans: A

5. .A power system is providing 200 VAC at 25 A. The phase angle between current and voltage is 25°. What is the true power used by the system? A. 2,113 W B. 4,531 W C. 5,517 W D. 11,831 W Ans: B

6. .What is the classification of an AC circuit in which the capacitive reactance is 50 O, the inductive reactance is 30 O and the resistance is 100 O? A. resistive B. inductive C. capacitive D. resonant Ans: C

7. .What happens to current flow in a capacitive circuit when the DC voltage across the capacitor is approximately equal to the source voltage? A. Current flow is optimized. B. Little current flows. C. Current flow is maximum at the source. D. Current flow is maximum at the capacitor. Ans: B

8. .If the distance between the plates of a capacitor decreases while all other components of the capacitor remain the same, what happens to the capacitance of the device? A. increases B. remains the same C. decreases D. varies Ans: A

9. .Which of the following devices can be used to test the windings of an inductor for continuity? A. wattmeter B. voltmeter C. ohmmeter D. Wheatstone bridge Ans: C