In the case of PMMC rectifier type instruments, the deflecting torque is proportional to
1). Average value of AC current
2). RMS of AC
3). Instantaneous value
4). Peak value
2. The resistance of a photoconductor
3. The most widely used rectifier is ___________
4. In case of conductively compensated D.C. series motors, the compensating winding is provided
5. Large industrial consumers are supplied electrical energy at
6. When a pentavalent impurity is added to a pure semiconductor, it becomes
7. Among the voltages to various electrodes in a CRT the voltage is the highest on
8. Artificial draught is produced by
10. In a free running oscilloscope, the horizontal deflection system is driven by a ________ waveform