LMRC Assistant Manager Operation Electrical Previous Year Paper | UPMRC Previous Year Paper
Lucknow Metro Rail Corporation (LMRCL) Assistant Manager S&T Shift 2 Paper 13th May 2018
| S.No. | Question |
| 1 | For ideal current and voltage sources, the input resistances are _____, respectively.
(a) Infinite and zero (b) Finite and small (c) One and infinite (d) Zero and infinite Ans – (a) |
| 2 | Which of the following theorems states that in a linear bilateral network, the voltage and the current source sinks can be interchanged?
(a) Norton theorem (b) Superposition theorem (c) Reciprocity theorem (d) Maximum power transfer theorem Ans –(c) |
| 3 | The full form of SOI in case of IC fabrication is
(a) Silicon on insulator (b) Surface of insulator (c) Silicon on inductor (d) Silicon of insulator Ans –(a) |
| 4 | The drain current in MOSFET is varied by
(a) Gate-to-source voltage (b) Gate current (c) Source voltage (d) Source-drain voltage Ans – (a) |
| 5 | LSI chips have
(a) Less than 10 components (b) 10-100 components (c) 100-1000 components (d) More than 1000 components Ans – (d) |
| 6 | Which of the following components CANNOT be fabricated on IC?
(a) Resistor (b) Transistor (c) Transformer (d) Capacitor Ans –(c) |
| 7 | Selectively removing unwanted material from the source of the wafer is referred to as
(a) Lithography (b) Oxidation (c) Etching (d) Diffusion Ans – (c) |
| 8 | Which is the final step in the wafer processing sequence?
(a) Photolithography (b) Oxidation (c) Metallization (d) Diffusion Ans – (c) |
| 9 | Efficiency of practically used solar cell is approximately
(a) 25% (b) 15% (c) 40% (d) 60% Ans – (b) |
| 10 | The dark current in a semiconductor photodiode is the
(a) Forward bias current (b) Forward saturation current (c) Reverse saturation current (d) Transient current Ans – (c) |
| 11 | Solar cell converts
(a) Sound energy to electrical energy (b) Electrical energy to mechanical energy (c) Solar energy to electrical energy (d) Electrical energy to light energy Ans –(c) |
| 12 | An example of trivalent impurity is
(a) Aluminium (b) Germanium (c) Barium (d) Chlorine Ans – (a) |
| 13 | The process of adding impurity to a pure semiconductor is called
(a) Mixing (b) Diffusion (c) Doping (d) Ionization Ans –(c) |
| 14 | The gain of MOSFET amplifier reduces at high frequency due to
(a) Coupling capacitors (b) Parasitic capacitors (c) Bypass capacitors (d) Oxide capacitors Ans –(b) |
| 15 | Which of the following numbers of RC circuits will NOT produce oscillations in an R-C phase shift oscillator?
(a) 5 (b) 2 (c) 3 (d) 4 Ans – (b) |
| 16 | If HPF and LPF are of first order then BPF will have a roll-off rate of?
(a) -40 db/decade (b) -20 db/decade (c) 20 db/decade (d) 40 db/decade Ans – (b) |
| 17 | A power supply has full load voltage of 24 V. The value of its no load voltage for 5% regulation is
(a) 12 V (b) 23 V (c) 25.2 V (d) 6 V Ans – (c) |
| 18 | A positive half wave rectifier is a
(a) Positive clipper (b) Negative clipper (c) Negative clamper (d) Positive clamper Ans – (b) |
| 19 | For a full wave rectifier, if the peak voltage applied is 3.14 V, then the average value of voltage at output is
(a) 1 V (b) 0.5 V (c) 2 V (d) 0.25 V Ans – (c) |
| 20 | Voltage-to-current converter is also referred to as
(a) Trans resistance amplifier (b) Trans conductance amplifier (c) Resistance amplifier (d) Conductance amplifier Ans – (b) |
| 21 | Which amplifier circuit can be used as a current buffer circuit?
(a) CB (b) CC (c) CE (d) FET Ans –(a) |
| 22 | The voltage gains of an amplifier without feedback and with negative feedback are 100 and 20, respectively. The percentage of negative feedback is
(a) 4% (b) 2% (c) 5% (d) 8% Ans – (a) |
| 23 | The 3 dB cut-off frequency of a DC amplifier is 5 MHz. Its rise time is
(a) 350 ns (b) 70 ns (c) 200 ns (d) 35 ns Ans – (b) |
| 24 | Excess-3 code for decimal number 7 is
(a) 1110 (b) 1010 (c) 1011 (d) 1100 Ans – (b) |
| 25 | How many entries are there on a four-variable K-map?
(a) 16 (b) 4 (c) 8 (d) 2 Ans – (a) |
Leave a Reply