1. Which of the following instruments indicate the instantaneous value of the electrical quantity
being measured at the time at which it is being measured ?
(a) Absolute instruments
(b) Recording instruments
(c) Indicating instruments
(d) Integrating instruments

Answer: (c) Indicating instruments

2. In closed loop control system, with positive value of feedback gain the overall gain of
the system will
(a) decrease
(b) increase
(c) be unaffected
(d) any of the above

Answer: (a) decrease

3. For large power transformers, self oil cooled type or air blast type which of the
following values of current density may be used ?
(a) 1.0 to 1.2 A/mm2
(b) 1.5 to 2.0 A/mm2

(c) 3.3 to 4.3 A/mm2
(d) 2.2 to 3.2 A/mm2
Answer: (d) 2.2 to 3.2 A/mm2

4. A moving-coil permanent-magnet instrument can be used as flux-meter
(a) by eliminating the control springs
(b) by using a high series resistance
(c) by using a low resistance shunt
(d) by making control springs of large moment of inertia

Answer: (a) by eliminating the control springs

5. Pressure error can be measured by which of the following ?
(a) Strain gauge and potentiometer
(b) Selsyn
(c) Strain gauge
(d) Differential bellows and straingauge
Answer: (d) Differential bellows and straingauge

1 comment:

  1. Tks very much for your post.

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