NTDC Junior Engineer Electrical Paper 31 December 2022 MCQs

NTDC Junior Engineer Electrical Paper 31 December 2022 MCQs for preparation.

The pressure in the working fluid cycle of a thermal power plant is developed by

1. Condenser
2. Feedwater pump
3. Super heater
4. turbine

A turbine with rated speed of 250 rmp, connected to a synchronous generator, must produce power at 50 Hz .The generator must have

1. 4 poles
2. 8 poles
3. 16 poles
4. 24 poles

The rated voltage of a 3-phase power system is reported as

1. Peak line to line voltage
2. Peak phase voltage
3. RMS line to line voltage
4. RMS phase voltage

The insulation strength of a high voltage transmission line is determined by

1. Harmonics
2. Corona
3. Power factor
4. Switching over voltage

The precision of an instrument is determined by the

1. Closeness of measurement with the true value
2. Closeness of measurement with the fixed value
3. Closeness of different measurement with the same quantity
4. None of these

The power factor is said to be leading when

1. The current leads the voltage
2. The current lags the voltage
3. The voltage leads the current
4. voltage is in phase with the current

Power factor correction is the method of connecting

1. A capacitor in series with an inductive load
2. A capacitor in parallel with an inductive load
3. A inductor in series with an inductive load
4. A capacitor in series with an captivate load

The efficiency of a thermal power plant improves with :

1. The increased quantity of coal burnt
2. A large quantity of water used
3. Lower load in the plant
4. Use of high steam pressure

A condenser in a thermal power plant condenses steams coming out of :

1. Boiler
2. Turbine
3. Super heater
4. Economizer

Which verity of coal has a lowest calorific value ?

1. Steam coal
2. Bituminous coal
3. Lignite
4. Anthractice

__ are used to sense the fault and initiate a trip

1. Circuit breakers
2. Alternators
3. Protective relays
4. Cut outs

For rectification, we use ___ as a rectifier .

1. Capacitor
2. Inductor
3. Diode
4. Resistor

The solar cell is a PN- JUNCTION operating in :

1. Reverse bias
2. Forward bias
3. Unbaised
4. Sami baised

The electrical length of a transmission line is based on the

1. Physical length of the line
2. Wavelength of the AC on the line
3. Nominal voltage of the line
4. None of these

The surge impedance of a long power transmission is of the order of

1. 400
2. 500
3. 80
4. 40

Skin effect is proportional to which of the following ?

1. Diameter of conductor
2. (Diameter of conductor )2
3. (Diameter of conductor )3
4. (Diameter of conductor )4

Power plants using coal work closely on which of the following cycle ?

1. Otto cycle
2. Binary vapor cycle
3. Brayton cycle
4. Rankine cycle

The output of the solar cell is of the order of :

1. 0.5 w
2. 1 w
3. 0.2 w
4. 5 w