Type : Multiple Choice Single Correct

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Bertha Hardy
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1 Event Name: MIDC Dec 2014 Exam Exam Name : Deputy Engineer Post (Electrical/Mechanical) Total Questions : 100 Type : Multiple Choice Single Correct Q1. In illumination technology total lumens emitted by source / total lumens available after waste of light is equal to Option 1: waste light factor. Option 2: utilization factor. Option 3: beam factor Option 4: absorption factor. Q2. A dynamometer wattmeter can be used for Option 1: both D.C. and A.C. Option 2: D.C. only Option 3: A.C. only Option 4: any of the above Q3. Ampere-second is the unit of Option 1: Power Option 2: Energy Option 3: E.M.F Option 4: Charge Q4. In air conditioning design for summer months, the condition inside a factory where heavy work in performed as compared to a factory is which light work is performed should have Option 1: Lower dry bulb temperature and lower relative humidity Option 2: Lower dry bulb temperature and higher relative humidity Option 3: Lower dry bulb temperature and same relative humidity Option 4: Same dry bulb temperature and same relative humidity Q5. The delay period in CI engine depends upon which of the following? Option 1: Temperature and pressure in the cylinder at the time of injection Option 2: Nature of the fuel mixture strength Option 3: Relative velocity between the fuel injection and air turbulence pressure of residual gases Option 4: All of the above Q6. Consider the following statements: In a vapour compression system, a thermometer placed in the liquid line can indicate whether the 1.Refrigerant flow is too low 2.Water circulation is adequate 3.Condenser is fouled 4.Pump is functioning properly Which of these statements are correct? Option 1: 1, 2 and 3 Option 2: 1,3 and 4 Option 3: 1, 2 and 4 Option 4: 2, 3 and 4 Q7. In engine produces 10 kw brake power while working with a brake thermal efficiency of 30%. If the calorific value of the fuel used is kj/kg, then what is the fuel consumption? Option 1: 1.5 kg/hour Option 2: 3.0 kg/hour Option 3: 0.3 kg/hour Option 4: 1.0 kg/hour 1 Of 15

2 Q8. A hysteresis motor Option 1: is not a self-starting motor. Option 2: is a constant speed motor. Option 3: needs dc excitation. Option 4: cannot be run in reverse speed. Q9. An a.c. secondary distribution employs Option 1: 11kV, 3-phase, 3-wire system Option 2: 6.6Kv, 3-phase, 3-wire System Option 3: 3.3kV, 3-phase, 3-wire Option 4: 400/230V, 3-phase, 3-wire system Q10. Luminous efficiency of a fluorescence lamp is Option 1: 70 lumens / watt. Option 2: 60 lumens / watt. Option 3: 40 lumens / watt. Option 4: 30 lumens / watt. Q11. Normally for the design of transformer the ambient temperature is taken as Option 1: Option 2: Option 3: Option 4: Q12. To predict the performance of a centrifugal pump, a scale model of one half size was made. If the model pumps the same fluid as the prototype at the same rotative speed, if the power input to model pup was 20 kw, then the power required to drive the prototype pump would be Option 1: 56 kw Option 2: 100 kw Option 3: 260 kw Option 4: 640 kw Q13. Fuse in motor circuit provides Option 1: over current protection Option 2: short-circuit protection Option 3: open-circuit protection Option 4: none of the above. Q14. Centrifugal pumps have which of the following advantages? 1. Low initial cost 2. Compact, occupying less floor space 3. Easy handling of highly viscous 2 Of 15

3 Option 1: 1, 2 and 3 Option 2: 1 and 2 only Option 3: 1 and 3 only Option 4: 2 and 3 only Q15. Option 1: 0A Option 2: 1.2A Option 3: 114 ma Option 4: 1.14 A Q16. The load factor (L.F.), Maximum Demand (M.D),Average Load(A.L) Are Related As Option 1: LF=AL/MD Option 2: LF=AL MD Option 3: LF=MD/AL Option 4: LF=MD Q17. The solid angle subtended by an area of 2400 cm2 on the surface of a sphere of diameter 1.2 m is Option 1: 3/2 Option 2: 1/3 Option 3: 2/3 Option 4: 2/5 Q18. The number of free electrons passing through the filament of an electric lamp in one hour when the current through the filament is 0.32 A will be Option 1: Option 2: Option 3: Option 4: Q19. Oil for transformer cooling should have low Option 1: dielectric strength Option 2: viscosity Option 3: flash point Option 4: None of these Q20. Ignitors are used for starting. Option 1: Sodium vapor lamps Option 2: FTL Option 3: CFL 3 Of 15

4 Option 4: None of the above Q21. The material used for fuse must have Option 1: low melting point and high specific resistance Option 2: low melting point and -low specific resistance Option 3: high melting point and low specific resistance Option 4: low melting point and any specific resistance Q22. For a long uncompensated line the limit to the line loading ill governed by Option 1: thermal limit Option 2: voltage drop Option 3: stability limit Option 4: corona loss Q23. A 40 kw engine has a mechanical efficiency of 80%. If the frictional power is assumed to be constant with load, what is the approximate value of the mechanical efficiency at 50% of the rated load? Option 1: 0.45 Option 2: 0.55 Option 3: 0.65 Option 4: 0.75 Q24. Diamagnetic : Paramagnetic:: Option 1: Water: Air Option 2: Iron: Steel Option 3: Perm alloy: Super-alloy Option 4: Nickel: Cobalt. Q25. In a 3-phase synchronous motor Option 1: the speed of stator MMF is always more than that of rotor MMF. Option 2: the speed of stator MMF is always less than that of rotor MMF. Option 3: the speed of stator MMF is synchronous speed while that of rotor MMF is zero. Option 4: rotor and stator MMF are stationary with respect to each other Q26. Which of the following is not the transmission voltage in America? Option 1: 66 kv Option 2: l32kv Option 3: 264 kv Option 4: 400 kv Q27. Consider the following statements: In the case of a vapour compression machine, if the condensing temperature of the refrigerant is closer to the critical temperature, then there will be: 1. excessive power consumption 2. high compression 3. large volume flow Which of these statements are correct? Option 1: 1, 2 and 3 Option 2: 1 and 2 Option 3: 2 and 3 Option 4: 1 and 3 Q28. The Overall Efficiency of a stem power station is a about Overall Efficiency =Thermal Efficiency Option 1: Mechanical Efficiency Option 2: Electrical Efficiency 4 Of 15

5 Option 3: Prime More Efficiency Option 4: None of these Q29. For the same indicated work per cycle, mean speed and permissible fluctuation of speed, what is the size of flywheel required for a multi cylinder engine in comparison to a single acting cylinder? Option 1: Bigger Option 2: Smaller Option 3: Same Option 4: Depends on thermal efficiency of the engine Q30. which one of the following cannot be controlled by a three way catalytic converter? Option 1: HC emission Option 2: CO emission Option 3: NOx emission Option 4: SPM emission Q31. Which one of the following automobile exhaust gas pollutants is a major cause of photochemical smog? Option 1: CO Option 2: HC Option 3: NOx Option 4: SOx Q32. If the capacitor of a single-phase motor is short-circuited Option 1: the motor will not start Option 2: the motor will run Option 3: the motor will run in reverse direction Option 4: reduced r.p.m. Q33. Which of the following is not a part of overhead distribution line Option 1: Conductor Option 2: Insulator Option 3: Cross arms Option 4: Thimbles Q34. A mixed flow pump is driven by a 8 kw motor running at 1000 rpm. It delivers water at the rate of 1000 liters/min against a total head of 25 m. What is the specific speed of the pump in meter-minutes Option 1: 90 Option 2: 50 Option 3: 45 Option 4: 75 Q35. What is the purpose of supercharging an engine? Option 1: To increase the power output of engine Option 2: To reduce specific fuel consumption Option 3: To reduce the noise of the engine Option 4: To improve cooling of cylinders Q36. The sheath is used in cable to Option 1: provide strength to the cable. Option 2: provide proper insulation. 5 Of 15

6 Option 3: prevent the moisture from entering the cable. Option 4: avoid chances of rust on strands. Q37. Corona losses are minimized when Option 1: conductors size is reduced Option 2: smooth conductor is reduced Option 3: sharp points are provided in the line hardware Option 4: current density in conductors is reduced Q38. The relay used for the feeder protection is: Option 1: Under-voltage relay Option 2: Translay relay Option 3: Thermal relay Option 4: Buchholz relay Q39. The value of starting capacitor of a fractional horse power motor will be Option 1: 100 uf Option 2: 00 uf Option 3: 300 uf Option 4: 400 uf Q40. Tick mark the false statement with statement with respect to a reciprocating pump Option 1: indicator diagram shows variation of pressure head in the cylinder for one revolution of crank Option 2: the limiting value of separation pressure head for water is 7.8 m (absolute) Option 3: during suction, the separation may take place at the beginning of suction stroke Option 4: during delivery, the separation may take place at the end of delivery stroke Q41. In case of a universal motor, torque pulsation is minimized by. Option 1: LOAD INERTIA Option 2: ROTOR INERTIA Option 3: BOTH ROTOR AND LOAD Option 4: NONE Q42. Thevenin s equivalent circuit consists of. Option 1: Series combination of RTh, ETh and RL Option 2: Series combination of RTh, ETh. Option 3: Parallel combination of RTh, ETh. Option 4: Parallel combination of RTh, ETh and RL. Q43. An ideal dc generator has a regulation of percent Option 1: ZERO Option 2: 10 Option 3: 25 Option 4: 100 Q44. The pointer of an indicating instrument is made up of Option 1: Copper Option 2: aluminium Option 3: soft steel Option 4: silver 6 Of 15

7 Q45. A pump having an efficiency of 90%, lifts water to a height of 155 m at the rate of 7.5 m3/s. The friction head loss in the pipe is 13 m. The required pump power, in kw, will be Option 1: Option 2: 1373 Option 3: Option 4: Q46. Find the odd one out Option 1: Absorptive Option 2: Emissivity Option 3: Refractive index Option 4: Dielectric strength. Q47. A potentiometer may be used for Option 1: Measurement of resistance Option 2: Measurement of current Option 3: All the above Q48. Select the false statement regarding cavitation Option 1: Thoma's cavitation parameter has different expression for turbines and pumps Option 2: the leading edge of blades in pumps and the trailing edge of blades in water turbines are more susceptible to cavitation damage Option 3: cavitation affects the performance of a turbine to a lesser degree than that of a pump Option 4: with increase in speed of pump, there is increase in its minimum net positive suction head requirement Q49. SF6 gas Option 1: is yellow in colour Option 2: is lighter than air Option 3: is nontoxic Option 4: has pungent small Q50. For a single phase overhead line having solid copper conductors of diameter 1 cm, spaced 60 cm between centers, the inductance in mh/ km is Option 1: ln 60 Option 2: 0.2 ln 60 Option 3: ln (6010.5) Option 4: 0.2 ln (60/0.5) Q51. Total flux or lumens required in any lighting scheme depends inversely on Option 1: utilization factor. Option 2: reduction factor. Option 3: reflection factor. Option 4: none of the above. Q52. Consider the following statements: Diesel knock can be reduced by 1. increasing the compression ratio. 2. increasing the engine speed. 3. increasing the injection retard 4. decreasing the inlet air temperature. Which of these statements are correct? Option 1: 1, 2, 3 and 4 Option 2: 2 and 4 only Option 3: 1 and 3 only Option 4: 1, 2 and 3 only 7 Of 15

8 Q53. In electrical machines the material preferred for pole shoes of electro-magnets is Option 1: Pure iron Option 2: Aluminum Option 3: Copper Option 4: Lead Q54. For equilateral spacing of conductors of an untransposed 3-phase line, we have Option 1: balanced receiving end voltage and no communication interference Option 2: unbalanced receiving end voltage and no communication interference Option 3: balanced receiving end voltage and communication interference Option 4: unbalanced receiving end voltage and communication interference. Q55. Tap changing facility is generally provided on Option 1: high voltage transformers Option 2: distribution transformers Option 3: current transformers Option 4: step up transformers Q56. The heat generated in the transformer is dissipated to the surroundings mainly by Option 1: Conduction Option 2: Convection Option 3: Radiation Option 4: None of these Q57. Option 1: Option 2: Option 3: Option 4: Q58. Consider the following statements: 1. Supercharging increases the power output of an engine 2. Supercharging increases the brake thermal efficiency considerably. 3. Supercharging helps scavenging of cylinders. Which of these statements are correct? Option 1: only 1 and 2 Option 2: only 1 and 3 Option 3: only 2 and 3 8 Of 15

9 Option 4: 1, 2 and 3 Q59. The size of the feeder is determined primarily by Option 1: the current it is required to carry. Option 2: the distance of transmission. Option 3: the voltage across the feeder. Option 4: percent variation of voltage in the feeder. Q60. Which of the following gives materials in order of decreasing values of permeability? Option 1: Cobalt, Nickel, Aluminum, Iron Option 2: Perm alloy, Nickel, Air, Water Option 3: Silver, Copper, Aluminum, Iron Option 4: Pure iron, Silicon iron. Aluminum, Bismuth. Q61. A reciprocating water pump delivers 100 liters of water per second against a suction head of 5 m and delivery head of 15 m. The power required to drive the pump is near about Option 1: 10 kw Option 2: 15 kw Option 3: 20 kw Option 4: 25 kw Q62. Oil-filled cable has a working stress of kv/mm Option 1: 10 Option 2: 13 Option 3: 12 Option 4: 15 Q63. Which one of the following combination represents the power transmission systems Option 1: Pump, hydraulic accumulator, hydraulic intensifier, and hydraulic coupling Option 2: Pump, turbine, hydraulic accumulator and hydraulic coupling Option 3: Turbine, accumulator, intensifier and hydraulic coupling Option 4: Accumulator, intensifier, hydraulic coupling and torque converter Q64. a transmission line is protected by Option 1: inrush protection Option 2: distance protection Option 3: time and current graded over protection Option 4: both distance protection and time and current graded over protection Q65. Option 1: 1 Option 2: 2.5 Option 3: 25 Option 4: 5 9 Of 15

10 Q66. The amount of CO2 produced by 1 kg of carbon on complete combustion is Option 1: 3/11 kg Option 2: 3/8 kg Option 3: 8/3 kg Option 4: 11/3 kg Q67. Any winding of a power transformer develops short circuit owing to: Option 1: Loose connections Option 2: Insulation failure Option 3: Impulse voltage Option 4: Mechanical vibration Q68. Two pumps can operate independently at heads H1, H2 and discharge Q1, Q2 respectively. If the pumps are connected parallel, then what are the resulting discharge (Q) and Head (H) Option 1: Q = Q1 + Q2, H= H1 + H2 Option 2: Q = Q1 - Q2, H = H1- H2 Option 3: Q = Q1 = Q2, H = H1= H2 Option 4: Q = Q1 + Q2, H = H1 = H2 Q69. Water is to be lifted by net head of 180 m. Identical pumps with specific speed of 30, rotative speed of 1450 rpm and capable of discharging 200litres per second are available. The number of pumps required is Option 1: 1 Option 2: 2 Option 3: 3 Option 4: 4 Q70. The Major heat lost in a steam power station occurs in Option 1: Boiler Option 2: Condenser Option 3: Super heater Option 4: None of these Q71. Application of occupancy sensors is well suited for. Option 1: day light based controllers Option 2: night based controllers Option 3: motor controllers Option 4: movement or noise detector in room space Q72. Consider the following statements regarding a CI engine: 1. CI engine knock can be reduced by increasing compression ratio. 2. Thermal efficiency of a CI engine is lower relative to a SI engine. 3. CI engine has a higher specific output relative to SI engine. 4. CI engines use leaner mixtures relative to SI engines. Which of these statements are correct? Option 1: 1 and 3 only Option 2: 1, 2, 3 and 4 Option 3: 1 and 4 only Option 4: 2 and 4 only Q73. Mho relay have an R-X characteristics depicted by: Option 1: A straight line passing through origin Option 2: A straight line parallel to X-axis Option 3: A straight line parallel to R-axis 10 Of 15

11 Option 4: A circle passing through the origin Q74. The volute casing of a centrifugal pump has which of the following functions? 1.Eliminating loss of head due to change in velocity after exit from impeller 2.Direct the flow towards the delivery pipe 3. converts a part of the velocity head to pressure head 4.gives a constant velocity of flow. Select the correct answer using the codes given below Option 1: 1, 2 and 4 Option 2: 2 and 3 only Option 3: 1 and 4 only Option 4: 2 and 4 only Q75. The pressure at which separation take place is known as separation pressure. For water, the limiting value of separation pressure head is absolute Option 1: 2.5 m Option 2: 7.5 m Option 3: 10.3 m Option 4: 13.3 m Q76. Which of the following essential features is possessed by an indicating instrument? Option 1: Deflecting device Option 2: Controlling device Option 3: Damping device Option 4: All of the above Q77. What will be the total flux emitted by a source of 60 candle power? Option 1: lumens. Option 2: lumens. Option 3: 60 lumens. Option 4: None of these. Q78. The percentage of silicon in transformer stampings is usually limited to Option 1: Option 2: Option 3: 0.04 Option 4: 14%. Q79. Which of the following is not a non conventional energy source Option 1: Solar Option 2: Bio gas Option 3: Wind Option 4: Electricity Q80. An isolator is installed Option 1: to operate the relay of circuit breaker Option 2: as a substitute for circuit breaker Option 3: always independent of the position of circuit breaker Option 4: generally on both sides of a circuit breaker Q81. Which one of the following methods is/are adopted in the design of air duct system? 1.Velocity reduction method 2.Equal friction method 3.Static regain method Select the correct answer using the codes given below: Option 1: 1 only 11 Of 15

12 Option 2: 2 and 3 Option 3: 1 and 2 Option 4: 1, 2 and 3 Q82. Five cells each of e.m.f. E and internal resistance r are connected in series. If due to oversight, one connected wrongly, then equivalent e.m.f. and internal resistance of the combination are Option 1: 3E and 5r Option 2: 5E and 5r Option 3: 3E and 3r Option 4: 5E and 4r Q83. Option 1: 3 Option 2: 4.5 Option 3: 5.8 Option 4: 7 Q84. The impedance of a circuit is given by z=3+j4. Its conductance will be Option 1: 1/3 Option 2: 3/5 Option 3: 3/25 Option 4: 4/5 Q85. Which of the following is not the distribution system normally used Option 1: Single phase - 3 wire Option 2: 3 phase-4 wire Option 3: 3 phase-3 wire Option 4: Single phase -4 wire Q86. A generating station has a maximum demand of 50 Mw, a load factor of 60%, a plant capacity factor of 45% and if the plant while running as per schedule, were fully loaded. The daily energy produced will be Option 1: 400 MW Option 2: 720 MW Option 3: 500 MW Option 4: 600 MW Q87. The fact that a conductor carries more current on the surface as compared to core, is known as Option 1: skin effect Option 2: corona Option 3: permeability Option 4: unsymmetrical fault. Q88. The relay best suited for phase fault relaying for medium transmission lines is: Option 1: Mho relay Option 2: Reactance relay Option 3: Impedance relay Option 4: None of the above 12 Of 15

13 Q89. Burning out of windings is due to Option 1: short circuited capacitor Option 2: capacitor value hiving changed Option 3: open circuiting of capacitor Option 4: none of the above Q90. Which of the following are integrating instruments? Option 1: Ammeters Option 2: Voltmeters Option 3: Wattmeters Option 4: Ampere-hour and watt-hour meters Q91. Solar and wind hybrid system is Option 1: Becoming popular Option 2: Not possible Option 3: Conventional energy source Option 4: None of the above Q92. The e.m.f. of a cell depends upon Option 1: Internal Resistance Option 2: External Resistance Option 3: Electrolyte and Electrode of the cell Option 4: None of these Q93. Option 1: Option 2: Option 3: Option 4: 13 Of 15

14 Q94. A 60 Hz, 320 km lossless line has Bending end voltage 1.0 p.u, The receiving end voltage on no load is Option 1: 1.1 p.u Option 2: p.u. Option 3: p.u. Option 4: none of the above Q95. The order of the sub-harmonic during SSR for 50 Hz normal frequency is Option 1: 25 Hz Option 2: 16 2/3 Hz Option 3: 10 HZ Option 4: none of the above Q96. The arcing contacts in a circuit breaker are made of Option 1: copper tungsten alloy Option 2: porcelain Option 3: electrolytic copper Option 4: aluminium alloy Q97. In the analysis of transistor circuit, we usually use theorem Option 1: Norton s Option 2: Theremins Option 3: Reciprocity Option 4: Superposition Q98. Which of the voltage is not available for Indian distribution system? Option 1: 33 kv Option 2: 11 kv Option 3: 280 V Option 4: 433 V Q99. Replacing a 400 W HPMV with 250 V HPSV lamp in street lighting operate for 4000 hours per annum will result in annual energy savings Of Option 1: 600 kwh Option 2: 300 kwh Option 3: 150 kwh Option 4: 1000 kwh Q100. Option 1: 1.5 Option 2: 2 Option 3: 3 Option 4: 4 14 Of 15

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B How much voltage does a standard automobile battery usually supply?

B How much voltage does a standard automobile battery usually supply? Chapter 2 B-003-16-01 How much voltage does a standard automobile battery usually supply? 1. About 240 volts 2. About 120 volts 3. About 12 volts 4. About 9 volts B-003-16-02 Which component has a positive