098/23

73.

74.

75.

A basic D Arsonval movement has full scale current of 1mA and internal resistance
of 100 Q is used to convert a multirange DC voltmeter with the ranges of 0 — 20 V,
0-50 V, 0— 100 V and 0 — 250 V as shown below. The value of R, and R, respectively

Ry १७ १2 ‏د‎ Wh
ന്റ്‌ ٦
| ॥
| |
3

899 do vf ‏سے‎ ۱ ५००८0

250४» ‘ ۷ |
+ -----
A) 20kQ and 30 kQ B) 19.9kQ and 30 kQ
C) 20kQ and 29.9 kQ 7) 19.9೧ 8೧6 29.9೧

Three phase power measurement using two-wattmeter method, the reading of the
two wattmeters will be equal and opposite when

i. Phase angle is 90° lagging.
ii. Phase angle is 0°.
iii. Phase angle is 90° leading of these statement.
A) i, ii and iii are correct B) ii only correct

C) ionly correct D) i and iii are correct

Consider the statements below :
i. The compensating coil of a low power factor wattmeter compensates the effect
of the power consumed by the pressure coil.
ii. The compensating coil of a low power factor wattmeter compensates the effect
of power consumed by the current coil.
iii. The compensating coil of a low power factor wattmeter compensates the effect
of the friction of moving coil.

A) iand iii are true but ii is false
B) ii is true but i and iii are false
C) iis true but ii and iii are false
D) i and ii are true but iii is false