Master official APPSC Assistant Executive Engineer previous years' solved question papers with comprehensive step-by-step derivations across Electric Circuits & Network Theory, Electromagnetic Fields, Electrical Machines, Power Systems (Transmission, Distribution & Protection), Control Systems, Electrical & Electronic Measurements, Power Electronics & Drives, and Analog & Digital Electronics.
Marking pattern: +1.00 positive, -0.33 negative marking (Official APPSC 1/3rd Negative Marking Scheme; 150 Questions, 150 Marks).
In a delta/star transformer employing Merz price percentage differential protection the CT's are connected in the primary and secondary windings as
Large internal faults are protected by
A protective relay is energized through $11\text{ kV}/110\text{ V}$ PT and $100/5$ CT, then the ratio of secondary impedance to primary impedance $\frac{Z_{SEC}}{Z_{PRI}}$ as shown by relay will be
Back up protection protects against
If fault occurs near an impedance relay, the $\frac{V}{I}$ ratio is
The following data is obtained from a power station:
| Fixed cost | $= 20 \times 10^{5}$ |
| Variable cost | $= 30 \times 10^{5}$ |
| Units generated per annum | $= 175 \times 10^{6}\text{ kWh}$ |
The cost of generation per unit will be
When transmission losses are considered, the criteria of economic operation is given by
Optimum fuel economy is achieved, transmission losses being considered, when
A cost function for a power station is represented as
$$F_{c} = \alpha + \beta P_{i} + \gamma P_{i}^{2}$$
Hence, the incremental fuel cost will be given by
The constraint equation in computing economic criteria is given by
The incremental costs of two power stations are given as
$$(IC)_{A} = \beta_{A} + 2\gamma_{A} P_{A}$$
$$(IC)_{B} = \beta_{B} + 2\gamma_{B} P_{B}$$
If $\beta_{A} = \beta_{B}$ and $\gamma_{A} = \gamma_{B}$, for optimal operation,
Which of the following plants is used as peak load plant?
The choice of number and size of units in a station is governed by best compromise between
Plant capacity factor is
The product of diversity factor and maximum demand is
In optimum generator scheduling of different power plants, the minimum fuel cost is obtained when for each plant same is its
To effectively reduce the cost of generation in a power station, increase its
Power plant having maximum demand more than the installed rated capacity will have utilization factor
Most efficient plants are normally used as
When a plant resorts to load shedding it can be concluded that
The input to the set under Hopkinson's test is
In Swinburne's method of testing dc machines, the shunt machine is run as a
The moment of inertia of rotating machine (dc motor) can be obtained by calculations from the following test
The complete circle diagram of a 3-phase induction motor can be drawn with the help of
Ward Leonard method of speed control is basically a/an