ECET EEE Model Paper-1 Part8

1. The voltage used for sub urban trains in D.C. systems is usually

A. 12 V
B. 24 V
C. 220 V
D. 600 to 750 V

Answer :
Explanation:-

2. Filament lamps operate normally at a power factor of

A. 0.5 lagging
B. 0.8 lagging
C. 0.8 leading
D. Unity

Answer : Unity
Explanation:-

3. Which of the following is an open loop control systems

A. Field controlled D.C. motor
B. Ward Leonard control
C. Meta dyne
D. Stroboscope

Answer : Field controlled D.C. motor
Explanation:-

4. A reflector is provided to

A. Protect the lamp
B. Provide better illumination
C. Avoid glare
D. Do all of the above

Answer : Do all of the above
Explanation:-

5. Which of the motor always starts on load

A. Conveyor motor
B. Floor mill motor
C. Fan motor
D. All of the above

Answer : All of the above
Explanation:-

6. The skin effect is noticeable only at ……………frequencies

A. High
B. Low
C. All
D. Audio

Answer : High
Explanation:-

7. Address bus of Intel 8085 is …… bit wide

A. 2
B. 4
C. 8
D. 16

Answer : 16
Explanation:-

8. A 3-phase to 3-phase cyclo converter requires

A. 18 SCRs for 3 phase device
B. 36 SCRs for 16 pulse device
C. Either A and B
D. None of the above

Answer : Either A and B
Explanation:-

9. 8254 is a

A. Programmable timer
B. 8 bit micro processor
C. 3-8 decoder
D. Octal latch

Answer : Programmable timer
Explanation:-

10. The main use of class C amplifier

A. As an RF amplifier
B. As stereo amplifier
C. In communication sound equipment
D. As distortion generator

Answer : As an RF amplifier
Explanation:-