AP ECET EEE 2016-7

1.The TRIAC is equivalent to

A. Two SCRS connected in parallel
B. Two SCRs connected in anti-parallel
C. One SCR, one diode connected in parallel
D. One diode, the SCR connected in anti parallel

Answer : Two SCRs connected in anti-parallel
Explain:-

2.The advantage of using a free wheeling diode with bridge type ac/dc converter is

A. Regenerative braking
B. Reliable speed control
C. Improved power factor
D. Reduced cost of the system

Answer : Improved power factor
Explain:-

3.A power chopper converts

A. ac to dc
B. dc to dc
C. dc to ac
D. ac to ac

Answer : dc to dc
Explain:-

4. A three phase full converter is supplying a purely resistive load at 300 V dc for 0° firing angle. The output voltage for 90° firing angles would be

A. 0 V
B. 40 V
C. 50 V
D. 100 V

Answer : 0v
Explain:-

5. A single phase ac voltage controller is controlling current in a purely inductive load. If the firing angle of the SCR is a, what will be the conduction angle of the SCR

A. π
B. π-alpha
C. (2π-alpha)
D. 2π

Answer : π-alpha
Explain:-

6.Which braking is not possible in series motor

A. Regenerative braking
B. Dynamic braking
C. Counter current braking
D. rheostat braking

Answer : Regenerative braking
Explain:-

7.Full form of VVVF control

A. VAr Variable Voltage Frequency
B. Variable Voltage VAr Frequency
C. Variable A Ar Voltage Frequency
D. Variable Voltage Variable Frequency

Answer :Variable Voltage Variable Frequency
Explain:-

8. The 8051 microcontroller is of___ pin package as a _____ processor

A. 30, 1 byte
B. 20, 1 byte
C. 40, 8 bit
D. 40, 8 byte

Answer : 40, 8 bit
Explain:-

9. Serial port interrupt is generated, if _______ bits are set

A. IE
B. RI, IE
C. IP, TI
D. RI, TI

Answer : RI, TI
Explain:-

10.After reset, SP register in initialized to address

A. 8H
B. 9H
C. 7H
D. 6H

Answer : 6H
Explain:-