MCQOPTIONS
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MCQOPTIONS
This section includes 150 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The equation for electric flux density is given by |
| A. | D = εV |
| B. | D = εE |
| C. | D = ε/E |
| D. | D = ε/V |
| Answer» C. D = ε/E | |
| 52. |
The emf of the dry cell is about |
| A. | 0 V |
| B. | 0.5 V |
| C. | 1 V |
| D. | 1.5 V |
| Answer» E. | |
| 53. |
The efficiency of the transformer will be maximum when |
| A. | Iron losses is equal to the twice of the copper losses |
| B. | Copper losses is equal to the twice of the iron losses |
| C. | Iron losses is equal to the copper losses |
| D. | All of these |
| Answer» D. All of these | |
| 54. |
The direction of magnetic materials when the current passes through the conductor is determined by |
| A. | Right hand rule |
| B. | Maxwell’s corkscrew rule |
| C. | Left hand rule |
| D. | Only (a) and (b) |
| Answer» E. | |
| 55. |
The cut - in voltage for silicon and germanium are |
| A. | 0.3 V, 0.3 V |
| B. | 0.3 V, 0.7 V |
| C. | 0.7 V, 0.7 V |
| D. | 0.7 V, 0.3 V |
| Answer» E. | |
| 56. |
The braking torque of induction type single - phase energy meter is |
| A. | Directly proportional to the flux |
| B. | Inversely proportional to the flux |
| C. | Directly proportional to the square of the flux |
| D. | Inversely proportional to the square of the flux |
| Answer» D. Inversely proportional to the square of the flux | |
| 57. |
The atomic number of silicon and germanium is |
| A. | 32, 14 |
| B. | 12, 19 |
| C. | 14, 32 |
| D. | 19, 12 |
| Answer» D. 19, 12 | |
| 58. |
The amplitude or peak value or maximum value of an alternating voltage is given by the coefficient of the |
| A. | Sine of the time angle |
| B. | Cosine of the time angle |
| C. | Tangent of the time angle |
| D. | Cotangent of the time angle |
| Answer» B. Cosine of the time angle | |
| 59. |
The amount of work done in moving a charge from one point to another along an equipotential line or surface charge is |
| A. | Zero |
| B. | Infinity |
| C. | One |
| D. | Two |
| Answer» B. Infinity | |
| 60. |
The amount of flux density set up in the core is dependent upon |
| A. | Current |
| B. | No. of turns, cross sectional area of core |
| C. | Materials of the magnetic core, length of core |
| D. | All of these |
| Answer» E. | |
| 61. |
The advantage of skewing in induction motor is / are |
| A. | Motor runs smoothly as the magnetic hum is reduced |
| B. | The tendency of the rotor teeth to remain under the stator teeth due to direct magnetic attraction is reduced |
| C. | More uniform torque is obtained while running |
| D. | All of these |
| Answer» E. | |
| 62. |
Secondary’s cells are |
| A. | lead acid cell |
| B. | alkaline cell |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 63. |
Salient pole type motors have |
| A. | Large diameter and large axial length |
| B. | Small diameter and small axial length |
| C. | Large diameter and small axial length |
| D. | Small diameter and large axial length |
| Answer» D. Small diameter and large axial length | |
| 64. |
Root mean square value of current is equal to |
| A. | 1.414 times the maximum value |
| B. | 1.732 times the maximum value |
| C. | Twice the maximum value |
| D. | 0.707 times the maximum value |
| Answer» E. | |
| 65. |
Reluctance in a magnetic material is a property by virtue of which it opposes the creation of |
| A. | Electric flux |
| B. | Magnetic flux |
| C. | Electric field density |
| D. | Electric lines of force |
| Answer» C. Electric field density | |
| 66. |
Reduced voltage can be applied across the stator circuit by |
| A. | Using an autotransformer |
| B. | Connecting resistor in series with stator winding |
| C. | Connecting inductor in series with stator winding |
| D. | All of these |
| Answer» E. | |
| 67. |
Permeability of a material is |
| A. | Directly proportional to both flux density and magnetizing force |
| B. | Directly proportional to flux density and inversely proportional to the magnetizing force |
| C. | Directly proportional to the magnetizing force and inversely proportional to the flux density |
| D. | Inversely proportional to both flux density and magnetizing force |
| Answer» C. Directly proportional to the magnetizing force and inversely proportional to the flux density | |
| 68. |
Permanent magnet are manufactured by |
| A. | Copper sulphate |
| B. | Iron and cobalt |
| C. | Cobalt and nickel |
| D. | ALNICO |
| Answer» E. | |
| 69. |
Peak to peak value of a sine wave is |
| A. | Equal to the maximum or phase value of sine wave |
| B. | Twice the maximum or phase value of sine wave |
| C. | Half of the maximum or phase value of sine wave |
| D. | Four times the maximum or phase value of sine wave |
| Answer» C. Half of the maximum or phase value of sine wave | |
| 70. |
Necessity of earthing is to |
| A. | Protect the human being from shock |
| B. | Maintain the line voltage |
| C. | Protect tall building |
| D. | All of these |
| Answer» E. | |
| 71. |
Lithium cells operates ranging from |
| A. | -25 ° C to 25 ° C |
| B. | -50 ° C to 25 ° C |
| C. | -50 ° C to 75 ° C |
| D. | -75 ° C to 75 ° C |
| Answer» D. -75 ° C to 75 ° C | |
| 72. |
Leclanche cell Daniel cell is an example of |
| A. | both dry cell |
| B. | both wet cell |
| C. | dry cell, wet cell |
| D. | wet cell, dry cell |
| Answer» C. dry cell, wet cell | |
| 73. |
Laminations or stampings are used to reduce the eddy current losses. The direction of laminations should be such that |
| A. | They are perpendicular to the paths of eddy current and flux both |
| B. | They are parallel to the paths of eddy current and flux both |
| C. | They are perpendicular to the paths of eddy current and parallel to the flux |
| D. | They are parallel to the path of eddy current and perpendicular to the flux |
| Answer» D. They are parallel to the path of eddy current and perpendicular to the flux | |
| 74. |
In voltaic cell, anode and cathode of the cell is |
| A. | copper electrode, zinc |
| B. | zinc, copper |
| C. | aluminium, zinc |
| D. | nickel, cobalt |
| Answer» B. zinc, copper | |
| 75. |
In transformer if the secondary is open circuited then its terminal voltage is |
| A. | Same as the induced emf |
| B. | Greater than the induced emf |
| C. | Lesser than the induced emf |
| D. | None of these |
| Answer» B. Greater than the induced emf | |
| 76. |
In telegraphic machine, the machine parts that sends the message and the machine parts that receives the message are |
| A. | Morse key, Morse key |
| B. | Morse key, Morse sounder |
| C. | Morse sounder, Morse key |
| D. | Morse sounder, Morse sounder |
| Answer» C. Morse sounder, Morse key | |
| 77. |
In order to bring the pointer to rest within a short time, |
| A. | Gravity control is required |
| B. | Damping control is required |
| C. | Spring control is required |
| D. | All of these |
| Answer» C. Spring control is required | |
| 78. |
In N - type semiconductor, the impurities added to a semiconductor are |
| A. | Trivalent |
| B. | Pentavalent |
| C. | Monovalent |
| D. | Tetravalent |
| Answer» C. Monovalent | |
| 79. |
In lead acid accumulators, the container is filled with distilled water and concentrated sulphuric acid in the ratio of |
| A. | 1 : 2 |
| B. | 2 : 1 |
| C. | 3 : 1 |
| D. | 1 : 3 |
| Answer» D. 1 : 3 | |
| 80. |
In leclanche cell, anode is packed in a porous pot containing |
| A. | manganese dioxide |
| B. | charcoal powder |
| C. | sulphur dioxide |
| D. | only (a) and (b) |
| Answer» E. | |
| 81. |
In induction motor, greater the number of poles |
| A. | Lesser the speed |
| B. | Greater the speed |
| C. | Lesser the frequency |
| D. | All of these |
| Answer» B. Greater the speed | |
| 82. |
In India, the synchronous generator generates |
| A. | 11 kilo - volts |
| B. | 33 kV |
| C. | 66 kV |
| D. | Either (a) or (b) |
| Answer» E. | |
| 83. |
In India, direct - on - line starter can be used for 3 - phase squirrel cage induction motor up to the rating of |
| A. | 5 HP |
| B. | 10 HP |
| C. | 15 HP |
| D. | 25 HP |
| Answer» B. 10 HP | |
| 84. |
In HRC fuses, the space within the body surrounding the element is usually filled with |
| A. | Silver |
| B. | Zinc |
| C. | Quartz |
| D. | Copper |
| Answer» D. Copper | |
| 85. |
In gravity control, at the zero position of the pointer the controlling torque is |
| A. | Zero |
| B. | One |
| C. | 0.5 |
| D. | 7 |
| Answer» B. One | |
| 86. |
In four - point starter, the no volt release is connected across the |
| A. | Supply line through a protective resistance |
| B. | In series with field circuit through a protective resistance |
| C. | Either (a) or (b) |
| D. | None of these |
| Answer» B. In series with field circuit through a protective resistance | |
| 87. |
In Fleming’s right hand rule, the direction of the induced emf in the conductor is given by |
| A. | Index figure |
| B. | Middle figure |
| C. | Thumb |
| D. | None of these |
| Answer» C. Thumb | |
| 88. |
In DOL fuses are provided to protect against |
| A. | Short circuit protection |
| B. | Over voltage |
| C. | Over current |
| D. | Over load |
| Answer» B. Over voltage | |
| 89. |
In delta connected system, the potential difference between line outers is |
| A. | Equal to the phase voltage |
| B. | Greater than the phase voltage |
| C. | Less than the phase voltage |
| D. | None of these |
| Answer» B. Greater than the phase voltage | |
| 90. |
In Daniel cell, |
| A. | Layer of hydrogen bubbles is formed |
| B. | Polarization takes place |
| C. | Negative pole is a copper vessel |
| D. | None of these |
| Answer» E. | |
| 91. |
In core type transformer, the coils are wound in helical layers, each layers being insulated from each other by using |
| A. | Paper |
| B. | Cloth |
| C. | Cooling ducts |
| D. | All of these |
| Answer» E. | |
| 92. |
In cell, the current flows in outer circuit from |
| A. | Positive terminal to negative terminal and electrons from negative terminal to positive terminal |
| B. | Positive terminal to negative terminal and electrons from positive terminal to negative terminal |
| C. | Negative terminal to positive terminal and electrons from negative terminal to positive terminal |
| D. | Negative terminal to positive terminal and electrons from positive terminal to negative terminal |
| Answer» B. Positive terminal to negative terminal and electrons from positive terminal to negative terminal | |
| 93. |
In case of a synchronous generator, armature winding and field winding are |
| A. | Both stationary |
| B. | Stationary, rotating |
| C. | Rotating, stationary |
| D. | Both rotating |
| Answer» C. Rotating, stationary | |
| 94. |
In any network of wires carrying currents, the algebraic sum of all currents meeting at a point is equal to |
| A. | Sum of all the currents |
| B. | Zero |
| C. | Sum of outgoing current |
| D. | Sum of incoming current |
| Answer» C. Sum of outgoing current | |
| 95. |
In an induction motor, rotor speed is always |
| A. | Less than the stator speed |
| B. | More than the stator speed |
| C. | Equal to the stator speed |
| D. | None of these |
| Answer» B. More than the stator speed | |
| 96. |
In a star connected system, the current flowing through the line is |
| A. | Greater than the phase current |
| B. | Equal to the phase current |
| C. | Lesser than the phase current |
| D. | None of these |
| Answer» C. Lesser than the phase current | |
| 97. |
In a self excited generator, if the series field opposes the shunt field, then the generator is |
| A. | Cumulatively compounded |
| B. | Differentially compounded |
| C. | Series generator |
| D. | None of these |
| Answer» C. Series generator | |
| 98. |
In a gas filled lamp, inert gases are filled in the lamp to |
| A. | Compensate heat losses |
| B. | Minimize the electricity use |
| C. | Increase the brightness |
| D. | None of these |
| Answer» B. Minimize the electricity use | |
| 99. |
In a balanced 3-phase system, if one of the two wattmeter’s reading is negative then the |
| A. | Reading should be taken as it is |
| B. | Reading should be taken after reversing the pressure coil |
| C. | Reading should be taken after reversing the current coil |
| D. | All of these |
| Answer» C. Reading should be taken after reversing the current coil | |
| 100. |
In a 3 - phase star connected balanced induction motor, the line voltage is equal to the |
| A. | 3 times the phase voltage |
| B. | √3 times the phase voltage |
| C. | 1/√3 times the phase voltage |
| D. | 1/3 times the phase voltage |
| Answer» C. 1/√3 times the phase voltage | |