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Question
An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
Options
A. perpendicular to the field
B. along the field
C. along a straight line inclined at 45° to field
D. in a circular path
Correct Answer
in a circular path
More questions
1. The system in the given figure, has
Options
A. good gain and phase margin
B. poor gain and phase margin
C. good gain margin but poor phase margin
D. poor gain margin but good phase margin
Show Answer
Scratch Pad
Discuss
Correct Answer: poor gain margin but good phase margin
Explanation:
Since the plot is very near (-1 +
j
0) point, gain margin is poor.
2. Stepper motors find applications in
Options
A. X-Y plotters
B. numerically controlled machining equipment
C. printers
D. all of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: all of the above
Explanation:
Stepper motors are used in all these applications.
3. Whether a linear system is stable or unstable that it
Options
A. is a property of the system only
B. depends on the input function only
C. both (a) and (b)
D. either (a) or (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: is a property of the system only
Explanation:
Stability is a property of the system only.
4. If antenna diameter is increased four times, the maximum range is increased by a factor of
Options
A.
2
B. 2
C. 4
D. 0.2
Show Answer
Scratch Pad
Discuss
Correct Answer: 4
Explanation:
Range of radar is proportional to antenna diameter.
5. For the given figure,
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
For the inner loop, transfer function =
Then
.
6. For the given figure C(
s
)/R(
s
)
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
.
7. The symbol in figure is for
Options
A. SUS
B. SBS
C. SCS
D. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: SCS
8. As the temperature increases the mobility of electrons __________ .
Options
A. decreases because the number of carries increases with increased collisions
B. increases because the number of carries decreases with decreased collisions
C. remains same
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: decreases because the number of carries increases with increased collisions
Explanation:
Mobility of electrons
m
= 2.5 for electrons and 2.7 for holes in Si.
9. Thyristors can be used for control of
Options
A. dc separately excited motor
B. dc shunt motor
C. dc series motor
D. all of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: all of the above
10. RF amplifiers are used in radio receivers for
Options
A. improved image frequency rejection
B. improved rejection of adjacent unwanted signals
C. prevention of re-radiation of the local oscillator through the antenna of the receiver
D. all of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: all of the above
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