ECET EEE 2011-5

1. string efficiency is incresed by using

A. earthing
B. fuses
C. guard ring
D. lightening arrestor

Answer : guard ring
Explanation:-

2. If the sag is an overhead line increases, tension in the line

A. altered
B. decreases
C. increases
D. reaches to dangerous value

Answer : decreases
Explanation:-

3. A SCR has ____ PN Junctions

A. one
B. two
C. three
D. four

Answer : three
Explanation:-

4. A single diode operates as a

A. full wave rectifier
B. half wave rectifier
C. bridge rectifier
D. mid-point rectifier

Answer : half wave rectifier
Explanation:-

5. In phase controlled rectification, power factor

A. remians unaffected with firing angle
B. increases with increase in firing angle
C. decreases with increase in firing angle
D. is not related to firing angle

Answer : remians unaffected with firing angle
Explanation:-

6. The duty cycle of a step down chopper

A. Ton/[Ton+Toff]
B. Toff/[Ton+Toff]
C. [Ton+Toff]/Ton
D. [Ton+Toff]/Toff

Answer : Ton/[Ton+Toff]
Explanation:-

7. A cycloconverter is a

A. ac-dc converter
B. dc-ac converter
C. dc-ac converter
D. ac-ac converter

Answer : ac-ac converter
Explanation:-

8. It is advisable to control speed of induction motor by maintaining

A. voltage constant
B. frequency constant
C. v/f ratio constant
D. slip constant

Answer : v/f ratio constant
Explanation:-

9. In digital computers, a BYTE denotes

A. an 8bit binary word
B. an 6bit bianry word
C. an 4bit bianry word
D. an 12bit bianry word

Answer : an 8bit binary word
Explanation:-

10. In order to enter a control word in the control register to 8255, the instruction to be used is

A. OUT 01
B. OUT 02
C. OUT 03
D. ENTER

Answer : OUT 02
Explanation:-