154701. Two resistors of 80 Ω and 120 Ω are connected in parallel. If the current through 80 Ω resistor is 7 A, calculate the total current flowing through the circuit :
154702. A synchronous machine is called doubly excited machine because :
154703. Temperature compensation of a 18 V zener diode can be achieved by connecting it in
154704. An AM transmitter has an rms antenna current of 11 A when unmodulated and 13 A when sinusoidally modulated. The modulation index is :
154705. In the visual display on the CRT screen, the sweep voltage causes the spot to move about the screen:
154706. Recursion is a process in which a function calls :
154707. What will be the final values of x and y? void main ()int x = 1, y = 1; clrscrf); do while (x<=7){x++, y++;}while (y<=5);printff\n x=%dy = %d', x, y);
154708. What will be the output of the following program? void main(){char x = fd’; clrscrO; switch (x){case 'b'puts( “0 1 001');break;default:puts ('3 2 1');break;case ‘R’:puts (“I II I III');}(A) x = 6 y = 6(C ) x - 8 y = 8(B)x=8y=6(D)none of the above
154709. Nodal analysis is based on :
154710. Which is incorrect statement in case of series resonance condition :
154711. When maximum power is transferred to the load, the efficiency will be :
154712. Superposition theorem is applicable to:
154713. Potential of a sphere is :
154714. A, B, C, D represents the transmission parameters of a two-port network. For the network to be reciprocal the condition is:
154715. Select the correct statement in connection with symmetrical components :
154716. If two conductors carry current in opposite directions there will be :
154717. Ohm's law in point form in field theory can be expressed as :
(A): displacement current is negligible (B): displacement current is equal to conduction current (C): displacement current is higher than conduction current (D): displacement current is lower than conduction current
154719. The condition for maximum efficiency in a single phase transformer is :
(A): Hysteresis Loss = Eddy current loss (B): Core loss = Cu loss (C): Number of primary turns = Number of secondary turns (D): Primary Loss = Secondary loss
154720. A 4 pole, wave wound DC generator has 144 slots with 3 conductors per slot, if the speed of machine is 1200 rpm, and the working flux is 0,025 Wb/pole, the generated emf will be :
(A): 3-point starter is used for improving the efficiency of DC motor (B): DC series motor shall be started without any load (C): Equalizer rings are used for reducing the armature reaction (D): Lap winding is used for low-voltage, high-current generators
154724. Which of the following is not the condition for synchronizing an alternator with the grid?
(A): Phase sequence of the alternator is required to be same as that of the grid (B): Voltage magnitude of both the alternator and grid to be same (C): Frequency to be same on both sides (D): Power rating to be same on both sides
154725. The maximum starting torque is developed in an induction motor:
(A): When rotor resistance equals rotor reactancej (B): When slip of the machine is unity (C): When hunting windings are used (D): When slip rings are used
(A): Synchronous motor runs only at synchronous speed (B): Under excited synchronous motor is also known as synchronous condenser (C): Single phase induction motor is not a self starting machine (D): Star-Delta starter is used to start a three phase induction motor
(A): Maximum demand of consumers / Average demand (B): Sum of maximum demands of consumers / maximum demand of consumer (C): Connected load / Maximum demand (D): Average demand / Maximum demand
154730. The fuel inputs per hour for plants 1 and 2 are given as :F1= 0.2P + 40Pj +120 F2 = 0.25P + 30P2 +160The maximum and minimum loading on each unit is 100 MW and 25 MW. The demand is 180 MW. The economic operating schedule is
154733. The p.u. value of an alternator corresponding to base values 13.2 kV and 30 MVA is 0.2 p.u. The p.u. value for the base values 13.8 kV and 50 MVA will be :
154738. In the measurement of power by two wattmeter method in three phase circuit, when one of the wattmeter shows zero reading, it can be inferred that:
(A): Power factor of the circuit is zero (B): Power factor of the circuit is 0.5 lagging (C): Pow er factor of the circuit is unity (D): Zero reading wattmeter is faulty
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