ECET EEE 2012-6

1. Resistacne of earth system of power stations should not exceed the limit of

A. 0.5 ohms
B. 2 ohms
C. 1 ohm
D. 5 ohms

Answer : A. 0.5 ohms
Explanation:-

2. In electrical installation the fuse is always connected in _______ wire

A. earth
B. neutral
C. phase
D. ground

Answer : C. phase
Explanation:-

3. The transistor used in apmlifier circuit operates in

A. Active region
B. Saturation region
C. Cut off region
D. Reverse region

Answer : A. Active region
Explanation:-

4. The gain of an amplifier is given by the following formula

A. G(db) = 10log(Pin/Pout)
B. G(db) = 10log(Pout)
C. G(db) = 10log(Pout/Pin)
D. G(db) = 10log(Pin)

Answer : C. G(db) = 10log(Pout/Pin)
Explanation:-

5. The number of diodes that are used in half wave rectifier and full wave bridge rectifier are

A. 1,2
B. 1,4
C. 2,4
D. 2,1

Answer : C. 2,4
Explanation:-

6. The average voltage of a full wave rectifier fed from an ac source of peak voltage Vm and frequency

A. Vm/π
B. 2Vm/π
C. Vm/√2
D. Vm/2

Answer : B. 2Vm/π
Explanation:-

7. In a transistor which of the following layer is lightly doped

A. emitter
B. collector
C. drain
D. base

Answer : D. base
Explanation:-

8. Zener diode regulates

A. voltage
B. current
C. resistance
D. power

Answer : A. voltage
Explanation:-

9. The frequency of oscillation of wein bridge oscillator in Hz is

A. 1/2πRC
B. 2πRC
C. 1/RC
D. R/C

Answer : A. 1/2πRC
Explanation:-

10. XYZ+(X'+(YZ)')XYZ+(XY)'Z

A. XYZ
B. X
C. Z
D. 0

Answer : A. XYZ
Explanation:-