76. Aperiodic voltage waveform observed on an oscilloscope across a load is shown. A permanent

77.

78.

79.

80.

magnet moving coil meter connected across the same load reads:
۷۷
10
5\/ ‏ا‎ -----
0: 10) 12 0 time (ms)
-5\/]----------
(A) 5V (8) 10V
(0) 4४ (0) 8V
Match the following:
Instrument type Quantity measured
P. Permanent Magnet Moving Coil 1. «^¢
Q. Rectifier Type 2. DC
R. — Electrodynamometer 3. Both AC and DC
S. | Moving Coil connected through a
current transformer
(^) 7-2, ९-3, 8-8, 5-1 (8) 7-1, ६-1, ६-2, 5-2
(0) 7-2, ९-1, 8-2, 5-8 டு) ۶-3 ६-1, 8-2, 5-8

One Single phase energy meter operating on 230 V and 2 A for 5 hours makes
460 revolutions. Meter constant in revolution is 400. The power factor of the load will be:

(A) 1 (B) 0.4
(C) 09 (D) 0.5
Two wattmeter method is used for measurement of power in a balanced three-phase load

supplied from a balanced three-phase system. If one of the Wattmeter reads half of the other
(both positive), then the power factor of the load is:

(A) 0 (B) 05
(C) 0.866 (D) 1.0

A moving coil galvanometer is made into a D.C. ammeter by connecting:
(A) A high resistance in series with the meter
(2) A low resistance across the meter
(0) Acapacitor in series with the meter

(D) Apure inductance across the meter

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[P.T.0.]