SSC JE Electrical Engineering 2013

Phasor diagram of load voltage (V), current in pressure coil $$(I_p)$$ and current in current coil $$(I_C)$$ is shown in the figure when an electrodynamic watt meter is used to measure power. The reading of the watt meter will be proportional to

Two parallel conductors carrying current in opposite directions will exert on each other

The unit of reluctance of magnetic circuit is

In indicating instruments the springs are mainly used to

A balanced 3-phase, 3-wire supply feeds balanced star connected resistors. If one of the resistors is disconnected, then the percentage reduction in load will be

The total flux at the end of a long permanent bar magnet is $$ 100 \times 10^{-6} Wb$$. The end of this magnet is withdrawn through a 1000 turn coil in 1/20 seconds. The induced e.m.f. in the coil is

In reference to the figure, the voltage waveform v(t) is measured by a PMMC, a PMMC combined with bridge rectifier and a moving iron (MI) instrument. Two lists are prepared thereafter

The correct option relation the instruments and their reading is

The switching transistor as shown, carries in the collector side an rms current of 8 mA. If the frequency of rectangular pulse train $$ V_i $$ is 50 Hz, then on-time of the transistor is

A ammeter of resistance $$ R_m $$ is placed an arrangement as shown in the figure. Material of $$ R_m, R_{sh} $$ is copper whereas that of $$ R_s, R_x $$ is manganin. The condition for which the meter performance is compensated against temperature, is

If a 110 V, 50 Hz is applied across a PMMC voltmeter of full-scale range 0-220 V and internal resistance of $$ 10Ω $$, reading of the voltmeter will