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Materials and Components
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Question
For a permanent magnetic material
Options
A. the residual induction and coercive field should be large
B. the residual induction and coercive field should be small
C. area of hysteresis loop should be small
D. initial relative permeability should be high
Correct Answer
the residual induction and coercive field should be large
Explanation
Materials suitable for permanent magnet have large hysteresis loop.
Hence residual and coercive field are large.
More questions
1. Which of the following noise becomes of great importance at high frequencies?
Options
A. Transit-time noise
B. Shot noise
C. Flicker noise
D. Agitation noise
Show Answer
Scratch Pad
Discuss
Correct Answer: Transit-time noise
2. A current source inverter has simple commutation circuit.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
3. In the given figure the line voltage after a number of reflections will be
Options
A. 30 V
B. -30 V
C. 10 V
D. -10 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 10 V
4. When the core of a saturable reactor is saturated, the inductance is high.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
Explanation:
Since core is saturated, change of flux is small and inductance is low.
5. The output wave of a cycloconverter consists of a number of segments derived from the input wave.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
6. For the control system in the given figure, the value of K for critical damping is
Options
A. 1
B. 5.125
C. 6.831
D. 10
Show Answer
Scratch Pad
Discuss
Correct Answer: 5.125
Explanation:
since ? = 1, ?
n
= 3.5 Hence 2 + 2k = 3.5
2
= 12.25 or K = 5.125 .
7. As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
8. The circuit of the given figure realizes the function
Options
A. Y = (
A
+
B
) C +
DE
B. Y =
A
+
B
+
C
+
D
+
E
C. AB + C +DE
D. AB + C(D + E)
Show Answer
Scratch Pad
Discuss
Correct Answer: Y = (
A
+
B
) C +
DE
Explanation:
or
Y = (
A
+
B
)C +
DE
.
9. The two modes of operation of three phase bridge inverters are known as
Options
A. 60° mode and 120° mode
B. 90° mode and 120° mode
C. 120° mode and 180° mode
D. 120° mode and 240° mode
Show Answer
Scratch Pad
Discuss
Correct Answer: 120° mode and 180° mode
Explanation:
In 180° mode each thyristor conducts for 180° and in 120° mode each thyristor conducts for 120°.
10. A first order system will never be able to give a __________ response
band stop
band pass
all pass
Choose the correct option
Options
A. 1, 2, 3 true
B. 1 and 3 true, 2 false
C. 1, 2 are true 3 is false
D. 1, 2 are false, 3 is true
Show Answer
Scratch Pad
Discuss
Correct Answer: 1, 2 are true 3 is false
Explanation:
Because to design band pass or band stop, transfer function of must be second order.
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