1. The frequency of carrier in the carrier current pilot scheme is in the range of (a) 1 kHz to 10 kHz. (b) 10 kHz to 25 kHz. (c) 25 kHz to 50 kHz. (d) 50 kHz to 500 kHz. 2. The frequency of carrier transmitted by microwave pilot is in the range of (a) […]
1. Purpose of backup protection is (a) to increase the speed. (b) to increase a reach. (c) to leave no blind spot. (d) to guard against failure of primary. 2. Protective relays are the devices that detect abnormal conditions in electrical circuits by measuring (a) voltage. (b) current. (c) constantly the electrical quantities which differ
1. Which of the following results in a symmetrical fault ? (a) Single-phase-to earth. (b) Phase-to-phase. (c) All the three phases-to earth. (d) Two phases-to earth. 2. Which portion of the transmission system is more prone to faults? (a) Alternator. (b) Transformer. (c) Overhead lines. (d) Underground cable. 3. Which portion of the power system
1. The capacitance of a cable depends upon the (a) length of the cable. (b) relative permittivity of dielectric used in cable. (c) ratio of sheath diameter and core diameter. (d) all of the above. 2. The charging current drawn by the cable (a) lags behind the voltage by 90°. (b) leads the voltage by
1. Bundled conductors are used to (a) reduce inductance of the line. (b) reduce both inductance and capacitance. (c) reduce corona loss. (d) reduce corona loss and the line inductance. 2. A 3-phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to ‘d.’ If now the conductors of the
1. A 3 -phase, 4-wire system is commonly used for (a) primary distribution. (b) secondary distribution. (c) primary transmission. (d) secondary transmission. 2. The rated voltage of a 3-phase power system is given as (a) RMS phase voltage. (b) peak phase voltage. (c) RMS line to line voltage. (d) peak line to line voltage. 3.
1. The main objectives of load frequency control in a power system are: to bring the steady state error to zero after load change. to maintain the net tie-line flow. to maintain voltages on all buses. to economize the cost of generation. (a) 1 and 2. (b) 2 and 3. (c) 3 and 4. (d)
1. Seeding material commonly used in MHD generator is (a) sodium. (b) aluminum. (c) potassium. (d) cesium. 2. Which of the following liquid metal is not used as an MHD working fluid ? (a) Potassium. (b) Sodium (c) Lithium (d) all of the above 3. The exhaust from an MHD generator is at a temperature
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1. Western U.P, Rajasthan, Punjab, Haryana, Tamil Nadu are quite suitable areas for (a) hydroelectric power plants. (b) steam power plants. (c) nuclear power plants. (d) all of the above. 2. One atomic mass unit (amts) is approximately equal to (a) 1.66 x 10-24 kg (b) 1.66 x 1027 kg (c) 1.6 x 1019 kg
1. Within the boiler, the steam has highest temperature in (b) water tubes. (a) super-heater (c) water walls. (d) water drum. 2. Which of the following enters the superheater ? (a) Superheated steam. (b) Wet steam. (c) Hot water. (d) Cold water. 3. Superheated steam is always (a) at a pressure more than that of