1. In moving iron instruments, the damping torque is provided by
(A) fluid friction damping.
(B) air friction damping.
(C) eddy current damping.
(D) none of these.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
2. The pointer of an indicating instrument is generally made of
(A) copper.
(B) aluminium.
(C) brass.
(D) soft steel.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
3. What will happen if the ammeter is connected like a voltmeter in parallel to the load?
(A) there will no current in the circuit.
(B) ammeter will work as voltmeter.
(C) very high current will flow.
(D) nothing will happen in the circuit.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
4. Shunts are generally made of
(A) nichrome.
(B) manganin.
(C) copper.
(D) carbon.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
5. Which of the following is used to measure the inductance
(A) Wien Bridge.
(B) Schering Bridge.
(C) Maxwell Bridge.
(D) Owen Bridge.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
6. A moving coil galvanometer is made into a DC ammeter by connecting
(A) high resistance in series with meter.
(B) low resistance in parallel with meter.
(C) an inductance in parallel with meter.
(D) inductance in series with meter.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
7. If any instrument obey Square Law, it can be used for the measurement of
(A) AC only.
(B) pure DC only.
(C) both AC and DC.
(D) pulsating DC only.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
8. Hysteresis error, in moving iron instruments, may be reduced by using
(A) silicon Steel.
(B) stainless steel.
(C) permalloy or mumetal.
(D) silver coating.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
9. Resolution of an instrument is
(A) the minimum quantity it can measure.
(B) the maximum quantity it can measure.
(C) the maximum non linearity.
(D) the maximum accuracy.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
10. The ratio of torque to the weight of an instrument is known as
(A) accuracy.
(B) reliability.
(C) sensitivity.
(D) selectivity.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]
11. A CRO uses
(A) electromagnetic focusing.
(B) magnetic focusing.
(C) electrostatic focusing.
(D) dynamic focusing.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
12. The resistance of an ideal voltmeter is
(A) zero.
(B) infinite.
(C) very low.
(D) equal to load resistance.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] B [/accordion-item][/accordion]
13. The resistance of an ideal ammeter is
(A) zero.
(B) infinite.
(C) very high.
(D) equal to load resistance.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] A [/accordion-item][/accordion]
14. If permanent magnet moving coil instruments is connected to AC supply, the average torque produce will be
(A) very high.
(B) normal.
(C) low.
(D) zero.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] D [/accordion-item][/accordion]
15. A moving iron instrument can be used for measuring
(A) D.C. only.
(B) A.C. only.
(C) both D.C. and A.C.
(D) none of the above.
[accordion clicktoclose=true tag=h4][accordion-item title=”Answer ⇓” state=closed] C [/accordion-item][/accordion]