LMRC Assistant Manager Operation Electrical Previous Year Paper | UPMRC Previous Year Paper
Lucknow Metro Rail Corporation (LMRCL) Assistant Manager Operation Electrical Shift 2 Paper 12th May 2018
| S.No. | Question |
| 1 | Battery under discharging condition will be considered as a/an
(a) Passive element (b) Active element (c) Ideal current source (d) Ideal voltage source Ans-(b) |
| 2 | The current taken by the capacitor leads the applied voltage by
(a) Half of a cycle (b) A full cycle (c) Quarter of a cycle (d) Three-fourth of a cycle Ans – (c) |
| 3 | The power consumed by a resistance in a delta-connected circuit is ____ that consumed by the same resistance in a star-connected circuit.
(a) Equal to (b) Less than (c) Nine times more than (d) Three times more than Ans –(d) |
| 4 | A three-phase motor connected with a 400 V balanced system consumes 1732 watts at a power factor of 0.5. The line current will be
(a) 10 A (b) 25 A (c) 8.66 A (d) 5 A Ans –(d) |
| 5 | If a brass core of an inductor is replaced by an iron core, the inductance of the coil
(a) Increases (b) Decreases (c) Does not change (d) Will be zero Ans-(a) |
| 6 | In a balanced three-phase, star-connected system, the phase difference between phase voltages and their respective line voltages is
(a) 30 degree (b) 60 degree (c) 120 degree (d) 45 degree Ans-(a) |
| 7 | A 1 H pure inductor carrying a current of 3 A will store _____energy
(a) 4.5 W (b) 9 J (c) 9 W (d) 4.5 J Ans – (d) |
| 8 | In an R – L – C series circuit, at resonance frequency, the voltage across the resistance is
(a) Much lower than the applied voltage (b) Equal to the applied voltage (c) Much higher than the applied voltage (d) A function of the value of the inductance Ans –(b) |
| 9 | Voltage regulation due to the Ferranti effect may be
(a) Negative (b) Positive (c) Zero (d) All of the given options Ans –(a) |
| 10 | A conductor consisting of a centre core of steel surrounded by layers of aluminium is named as
(a) Aluminium conductor (b) All Aluminium conductor (c) All Aluminium Alloy Conductor (d) Aluminium Conductor Steel Reinforced Ans –(d) |
| 11 | The required line compensating inductance between line to neutral is 800 Ohms to get a receiving end voltage of 400 KV. The reactance generates
(a) 800 MVar (b) 700 MVar (c) 200 MVar (d) 66.66 MVar Ans –(c) |
| 12 | Drop control is related to
(a) Frequency control of generator (b) Voltage control of generator (c) Current control of generator (d) Impedance control of generator Ans- (a) |
| 13 | Alpha in G-S load flow method is used
(a) To enhance rate of convergence (b) To enhance the stability limit (c) To decrease the voltage values of the bus bar (d) To count the iteration number Ans –(a) |
| 14 | If the time of operation of a relay for unity TMS is 10 secs, the time of operation for 0.5 TMS will be
(a) 20 sec (b) 5 sec (c) 10 sec (d) 15 sec Ans- (b) |
| 15 | A Mho relay is a
(a) Voltage restrained directional relay (b) Voltage controlled over-current relay (c) Directional restrained over-current relay (d) Directional restrained over-voltage relay Ans –(a) |
| 16 | If a three-phase breaker is rated at 2000 MVA, 33 KV, its making current will be
(a) 35 KV (b) 49 KV (c) 70 KV (d) 89 KV Ans – (d) |
| 17 | The instruments that determine the electrical quantity to be measured directly in terms of deflection are called
(a) Absolute instruments (b) Integrating instruments (c) Secondary instruments (d) Recording instruments Ans-(c) |
| 18 | An energy meter is
(a) An indicating instrument (b) An integrating instrument (c) A recording instrument (d) An absolute instrument Ans –(b) |
| 19 | A 230 V single-phase energy meter has a constant load current of 20 A at unity power factor. If the meter disc makes 2300 revolutions during 2 hours, the meter constant will be
(a) 0.25 revolution/KWh (b) 250 revolution/ KWh (c) 0.30 revolution/ KWh (d) 270 revolution/ KWh Ans – (b) |
| 20 | Two ammeters with full scale reading of 1 mA and 10 mA are connected in parallel. If the readings of the two ammeters are 0.5 ma and 2.5 mA, respectively, what is the ratio of the internal resistance of ammeters?
(a) 1 : 10 (b) 10 : 1 (c) 1 : 5 (d) 5 : 1 Ans –(d) |
| 21 | For measurement of high resistance, we use
(a) Loss of charge method (b) Wheatstone bridge (c) Potentiometer method (d) Kelvin bridge method Ans – (a) |
| 22 | Piezoelectric transducers are
(a) Active transducers (b) Passive transducers (c) Secondary transducers (d) Primary transducers Ans – (a) |
| 23 | The purpose of synchronizing control in a Cathode-Ray Oscilloscope (CRO) is to
(a) Focus the spot on the screen (b) Lock the display of the signal (c) Adjust the amplitude of the display (d) Control the intensity of the spot Ans – (b) |
| 24 | An undamped system has a ______ response
(a) Oscillatory (b) Sustained oscillation (c) Non- oscillatory (d) Undeterminable Ans –(b) |
| 25 | The initial slope of Bode magnitude plot gives information about
(a) The type of system (b) The order of characteristic equation (c) The gain at frequency of 1 rad/sec (d) The number of zeros of open loop transfer function Ans – (a) |
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