(a) Shunt
(b) Multiplier
(c) Both (a) & (b)
(d) C.T. & P.T.
2. The voltage drops across shunt and basic meter are...
(a) Different
(b) Same
(c) Maximum
(d) Minimum
3. Common materials used for shunt & multiplier are...
(a) Copper & aluminum
(b) Iron & Nickel
(c) Mica & paper
(d) Manganin & constantan.
4. The multiplier is connected to the basic meter in....
(a) Series
(b) Parallel
(c) All of above
(d) Series & parallel
5. The magnitude of current through multiplier & meter is...
(a) Different
(b) Same
(c) Maximum
(d) Zero
6. Voltmeter multipliers when used with the instruments to be employed for a.c. measurements then total impedance must remain...
(a) Almost constant
(b) Constant
(c) Variable
(d) Maximum
7. The instrument transformers find a wide application in.
(a) Protection circuits of power system
(b) Metering purpose
(c) Over current & under voltage relays
(d) All of above
8. When secondary of C.T. is open circuited it will
(a) Produce excessive core loss
(b) Produce subsequent heating
(c) Produce high voltage across secondary
(d) All of above
9. Out of the terminals of the secondary winding of earthed so as to...
(a) Protect equipment
(b) Protect person in the vicinity
(c) Avoid short circuit
(d) Both (a) and (b)
10. The phase angle between primary and secondary currents of C.T. is...
(a) 180°
(b) 90°
(c) slightly less than 180°
(d) 120°
11. The potential transformers are...
(a) Ordinary step-down transformers
(b) Extremely accurate-ratio step-down transformers
(c) Extremely accurate-ratio step-up transformers
(d) Both (b) & (c)
12. If the power factor of secondary burden is reduced, the phase angle of secondary load circuit of P.T. is...
(a) Increased
(b) Decreased
(c) Constant
(d) Maximum
No comments:
Post a Comment