Hydrogen is used in large size transformers MCB large size generators circuit br

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Correct Answer

large size generators

Explanation

Modem large size generators have hydrogen cooling.

More questions

1. An LED has a rating of 2 V and 10 mA. It is used along with 6V battery. The range of series resistance is
Options
A. 0 to 200 ?
B. 200 - 400 ?
C. 200 ? and above
D. 400 ? and above

3. In a reflex klystron oscillator, repeller electrode is at
Options
A. low positive potential
B. high positive potential
C. negative potential
D. zero potential

4. Characteristic impedance of a transmission line is 50 ?. Input impedance of the open circuited line.
Z_oc = 100 + J150 ?. When transmission line is short circuited, then value of the input impedance will be
Options
A. 50 ?
B. 100 + J150 ?
C. 7.69 + J11.54?
D. 7.69 - J11.54 ?

5. A half wave diode rectifier has a capacitance input filter. If input voltage is V_m sin ?t, PIV is
Options
A. V_m
B. 2 V_m
C. 3 V_m
D. 4 V_m

6. In terms of classical representation of electrons
Options
A. an atom is essentially empty
B. an atom is essentially full
C. an atom may be essentially empty or full depending on the material
D. an atom may be essentially empty or full depending on temperature

7. High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to
Options
A. reduce dc resistance
B. reduce ac resistance
C. increase dc resistance
D. increase ac resistance

8. Study the circuit of figure and examine the following statements
1. It is an active low pass finer.
2. It is a second order filter.
3. The change in gain is 40 dB/decade.
Which of the above statements are correct?
Options
A. 1, 2 and 3
B. 1 and 2
C. 1 and 3
D. 2 and 3

10. If VSWR is infinite, the transmission line is terminated in
Options
A. short circuit
B. complex impedance
C. open circuit
D. either (a) or (c)

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