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Question
In the below figure the average load current is 15 A. The rms value of transformer secondary current is
Options
A. 15 A
B. 10.61 A
C. 7.5 A
D. 14.14 A
Correct Answer
10.61 A
Explanation
RMS secondary current =
= 15/1.414 = 10.608 A.
More questions
1. Frequency range for satellite communication is
Options
A. 1 kHz to 100 kHz
B. 100 kHz to 10 MHz
C. 10 MHz to 100 MHz
D. 1 GHz to 30 GHz
Show Answer
Scratch Pad
Discuss
Correct Answer: 1 GHz to 30 GHz
2. To prevent a DC return between source and load, it is necessary to use
Options
A. resistor between source and load
B. inductor between source and load
C. capacitor between source and load
D. either (a) or (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: capacitor between source and load
Explanation:
Capacitor offers infinite impedance to DC.
3. Dielectric constant of transformer oil is about
Options
A. 1
B. 4
C. 10
D. 20
Show Answer
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Discuss
Correct Answer: 4
4. Which one of the following can be used for amplification of microwave energy?
Options
A. TWT
B. Magnetron
C. Reflex klystron
D. Gunn diode
Show Answer
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Discuss
Correct Answer: TWT
5. Which of the following is wrong for a magic used to tee?
Options
A. E and H arms are decoupled
B. coplanar arms are coupled
C. all ports are perfectly matched
D. A signal into coplanar arm splits equally between E and H arms
Show Answer
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Discuss
Correct Answer: coplanar arms are coupled
Explanation:
Coplanar arms are decoupled.
6. A UJT exhibits negative resistance characteristics when
Options
A. Current is less than valley current
B. Current is less than peak current
C. Current is more than peak current but less than valley current
D. None of the above
Show Answer
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Discuss
Correct Answer: Current is more than peak current but less than valley current
7. The signal defined by the equations
f
(
t
) = 0 for
t
< 0,
f
(
t
) = E for 0 ?
t
?
a
and
f
(
t
) = 0 for
t
>
a
is
Options
A. a step function
B. a pulse function
C. a shifted step function originating at
t
=
a
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: a pulse function
Explanation:
It is a pulse lasting for
t
=
a
.
8. Which of the following real variable names is not valid in Fortran?
Options
A. BETA
B. ALPHA
C. A
D. AB * 2
Show Answer
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Discuss
Correct Answer: AB * 2
Explanation:
Operator is not allowed.
9. TE
10
mode of propagation of electromagnetic energy in waveguides can be thought of as
Options
A. three TEM waves travelling along length of wave-guide
B. One TEM wave travelling along length of wave guide and one TEM wave propagation in the transverse plane
C. One TEM wave travelling along the length of wave guide and two TEM waves
D. none of the above
Show Answer
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Discuss
Correct Answer: One TEM wave travelling along the length of wave guide and two TEM waves
10. In sinusoidal PWM for inverters the width of different pulses are not the same.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
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