AP ECET EEE 2016-5

1.Frequency of single phase traction system is

A. 50 Hz
B. 16.67 Hz
C. 452/5
D. 450 HZ

Answer : 16.67 Hz
Explain:-

2.The traction motor used in tramways is

A. 3- phase induction motor
B. Single phase series motor
C. Dc series motor
D. Dc shunt motor

Answer : Dc series motor
Explain:-

3.Which of the following wiring system is commonly used for light/fan load in domestic and commercial buildings

A. Cleat wiring
B. Casing-capping wiring
C. TRS wiring
D. PVC wiring

Answer : PVC wiring
Explain:-

4. Why multi-strand conductors are preferred over solid conductors

A. Less in cost
B. Flexibility and durability
C. Brittle in nature
D. Less availability

Answer : Flexibility and durability
Explain:-

5. Which wiring system is employed in mechanical workshops

A. Conduit wiring system
B. Lead sheathed wiring
C. TRS wiring
D. Casing-capping wiring

Answer : Conduit wiring system
Explain:-

6.What is the average resistance of a human body

A. About 2000 ohms
B. About 100 ohms
C. About 1000 ohms
D. Zero ohms

Answer : About 1000 ohms
Explain:-

7. In what state is a silicon diode, if the voltage drop across it is about 0.7 V

A. No bias
B. Forward bias
C. Reverse bias
D. Zener region

Answer : Forward bias
Explain:-

8. A 3-phase diode bridge rectifier is fed from a 400 V rms, 50 Hz, 3 phase AC source. If the load is purely resistive, then peak instantaneous output voltage is equal to

A. 400 √2
B. 400 V
C. 400 √(2/3) V
D. 400/ √3 V

Answer : 400 √2
Explain:-

9. The cathode ray oscilloscope displays the graph of the waveforms base on

A. Current
B. Voltage
C. Potential difference
D. Temperature

Answer : Voltage
Explain:-

10.The op-amp comparator circuit uses

A. Negative feedback
B. A resistor
C. Positive feedback
D. No feedback

Answer : No feedback
Explain:-