Objective Questions Short notes Objective questions (Answers are given below) The basic electrical requirement in arc weldingis that there should be(a) coated electrodes(b) high open-circuit voltage(c) no arc blow(d) d.c. power supply. Welding is not done directly from thesupply mains because(a) it is customary to use welding machines(b) its voltage is too high(c) its voltage … Read more
ELECTRIC Heating is required for both industrial and domestic purposes. In industries, heating is required for the melting of metals, moulding of glass, enamelling of copper, baking of insulator and welding etc. In domestic purposes the heating is required for cooking, water heating, room heating in winter, pressing clothes and many more. Objective Questions Short … Read more
Objective Questions Short notes Objective questions (Answers are given below) The function of a cycloconverter is to convert(a) ac power into d.c. power(b) direct current into alternating current(c) high ac frequency directly to low acfrequency(d) a sine wave into a rectangular wave. Major disadvantage of using three sets of SCRsfor variable-voltage speed control of a … Read more
Objective Questions Short notes Objective questions (Answers are given below) Heat dissipation is assumed proportional to(a) Temperature difference(b) Temperature difference between motorand cooling medium(c) Temperature of cooling medium Temperature of cooling medium is assumed(a) constant (b) variable When the motor reaches final temperature riseits temperature remains(a) constant(b) falls(c) rises. For intermittent load, a motor of … Read more
Objective Questions Short notes Objective questions (Answers are given below) An electronic oscillator is(a) just like an alternator(b) nothing but an amplifier(c) an amplifier with feedback(d) a converter of ac to dc energy. The frequency of oscillation of an elementaryLC oscillatory circuit depends on(a) coil resistance(b) coil inductance(c) capacitance(d) both (b) and (c). For sustaining … Read more