MCQOPTIONS
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MCQOPTIONS
This section includes 143 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is |
| A. | 6.4 A, 6.9 A |
| B. | 6.4 A, 9.6 A |
| C. | 4.6 A, 6.9 A |
| D. | 4.6 A, 9.6 A |
| Answer» C. 4.6 A, 6.9 A | |
| 102. |
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 ohm. If the same four wires are connected is series the effective resistance will be |
| A. | 1 ohm |
| B. | 2 ohm |
| C. | 3 ohm |
| D. | 4 ohm |
| Answer» E. | |
| 103. |
The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ? |
| A. | 18 ohm |
| B. | 36 ohm |
| C. | 48 ohm |
| D. | 64 ohm |
| Answer» C. 48 ohm | |
| 104. |
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is |
| A. | 400 ohm |
| B. | 600 ohm |
| C. | 800 ohm |
| D. | 1000 ohm |
| Answer» D. 1000 ohm | |
| 105. |
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is |
| A. | 33 V |
| B. | 66 v |
| C. | 80 V |
| D. | 132 V |
| Answer» C. 80 V | |
| 106. |
An instrument which detects electric current is known as |
| A. | voltmeter |
| B. | rheostat |
| C. | wattmeter |
| D. | galvanometer |
| Answer» E. | |
| 107. |
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is |
| A. | 5 ohms |
| B. | 10 ohms |
| C. | 15 ohms |
| D. | 55 ohms |
| Answer» B. 10 ohms | |
| 108. |
The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around |
| A. | 1.2 x 10~8 Q-m |
| B. | 1.4 x 10~8 Q-m |
| C. | 1.6 x 10""8 Q-m (d) |
| D. | 1.8 x 10"8 Q-m |
| Answer» D. 1.8 x 10"8 Q-m | |
| 109. |
With rise in temperature the resistance of semi-conductors |
| A. | decreases |
| B. | increases |
| C. | first increases and then decreases |
| D. | remains constant |
| Answer» B. increases | |
| 110. |
With rise in temperature the resistance of pure metals |
| A. | Increases |
| B. | decreases |
| C. | first increases and then decreases |
| D. | remains constant |
| Answer» B. decreases | |
| 111. |
The resistance of a conductor varies inversely as |
| A. | length |
| B. | area of cross-section |
| C. | temperature |
| D. | resistivity |
| Answer» C. temperature | |
| 112. |
Conductance is reciprocal of |
| A. | resistance |
| B. | inductance |
| C. | reluctance |
| D. | capacitance |
| Answer» B. inductance | |
| 113. |
The property of a conductor due to which it passes current is called |
| A. | resistance |
| B. | reluctance |
| C. | conductance |
| D. | inductance |
| Answer» D. inductance | |
| 114. |
Out of the following which is an insulating material ? |
| A. | Copper |
| B. | Gold |
| C. | Silver |
| D. | Paper |
| Answer» E. | |
| 115. |
Out of the following which is not a poor conductor ? |
| A. | Cast iron |
| B. | Copper |
| C. | Carbon |
| D. | Tungsten |
| Answer» C. Carbon | |
| 116. |
The substances whfch have a large number of free electrons and offer a low resistance are called |
| A. | insulators |
| B. | inductors |
| C. | semi-conductors |
| D. | conductors |
| Answer» E. | |
| 117. |
Electric pressure is also called |
| A. | resistance |
| B. | power |
| C. | voltage |
| D. | energy |
| Answer» D. energy | |
| 118. |
The S.I. unit of power is |
| A. | henry |
| B. | coulomb |
| C. | watt |
| D. | watt-hour |
| Answer» D. watt-hour | |
| 119. |
A multirange instrument (ammeter or voltmeter) has |
| A. | Multiple shunt or series resistances inside the meter |
| B. | variable coil turns |
| C. | multi -coil arrangement |
| D. | any of the above |
| Answer» B. variable coil turns | |
| 120. |
If a voltmeter is connected like a ammeter in series with a load |
| A. | the measurement reading will be too high |
| B. | Almost no current will flow in the circuit |
| C. | the meter will burn out |
| D. | an inadmissably high current will flow |
| Answer» C. the meter will burn out | |
| 121. |
Voltmeter should be of very high resistance so that |
| A. | its range is high |
| B. | Its accuracy is high |
| C. | it may draw current minimum possible |
| D. | its sensitivity is high |
| Answer» D. its sensitivity is high | |
| 122. |
Which of the following types of instrument is an integrating instrument? |
| A. | power factor meter |
| B. | energy meter |
| C. | watt meter |
| D. | frequency meter |
| Answer» C. watt meter | |
| 123. |
which one is classified as integrating instrument? |
| A. | Darsonval galvanometer |
| B. | ampere-hour meter |
| C. | ohm-meter |
| D. | ammeter |
| Answer» C. ohm-meter | |
| 124. |
A series resonant circuit implies |
| A. | zero pf and maximum current |
| B. | unity pf and maximum current |
| C. | unity pf and minimum current |
| D. | zero pf and minimum current |
| Answer» D. zero pf and minimum current | |
| 125. |
The capacity of a battery is expressed in |
| A. | amperes |
| B. | amperes-hour |
| C. | watts |
| D. | watt-hour |
| Answer» C. watts | |
| 126. |
Cells are connected in parallel in order to increase |
| A. | life of the cells |
| B. | efficiency |
| C. | current capacity |
| D. | voltage rating |
| Answer» D. voltage rating | |
| 127. |
Cells are connected in series in order to increase the |
| A. | current capacity |
| B. | life of the cells |
| C. | voltage rating |
| D. | terminal voltage |
| Answer» D. terminal voltage | |
| 128. |
A battery is connected to a resistance causing a current of 0.5A in the circuit. The current drops to 0.4 when an additional resistance of 5? is connected in series . The current will drop to 0.2A when the resistance is further increased by |
| A. | 10 ohm |
| B. | 15ohm |
| C. | 25ohm |
| D. | 5 ohm |
| Answer» D. 5 ohm | |
| 129. |
A wye arrangement of resistances has each resistance of 3ohm, the equivalent delta arrangement will have each resistance of values. |
| A. | 9ohm |
| B. | 6ohm |
| C. | 3ohm |
| D. | 1ohm |
| Answer» B. 6ohm | |
| 130. |
KVL is concerned with |
| A. | IR drop |
| B. | battery emf |
| C. | junction node |
| D. | both a and b |
| Answer» D. both a and b | |
| 131. |
KCL is applicable only to |
| A. | electric circuits |
| B. | electronic circuits |
| C. | junctions in a network |
| D. | closed loop in a network |
| Answer» D. closed loop in a network | |
| 132. |
Kirchoff's laws are valid for |
| A. | linear ckt only |
| B. | passive time invariant ckt |
| C. | non-linear ckt only |
| D. | both linear & non-linear ckt |
| Answer» E. | |
| 133. |
A 200w, 100v lamp is to be operated on 250v supply. The additional resistance required to be connected in series will be: |
| A. | 125ohm |
| B. | 50ohm |
| C. | 75ohm |
| D. | 25ohm |
| Answer» D. 25ohm | |
| 134. |
Resistance of 200w,250v lamp will be |
| A. | 625ohm |
| B. | 1250ohm |
| C. | 312.5ohm |
| D. | 31.25ohm |
| Answer» D. 31.25ohm | |
| 135. |
The voltage applied across an electric iron is halved. The power consumption of the iron will be: |
| A. | increase one-half |
| B. | decrease one-fourth |
| C. | remain 1/√2times |
| D. | three-fourth |
| Answer» C. remain 1/√2times | |
| 136. |
Three resistors, each of R ohms, are connected to form a triangle. The resistance between any two terminals will be: |
| A. | 2/3 R |
| B. | 3/2R |
| C. | R |
| D. | 3R |
| Answer» B. 3/2R | |
| 137. |
A resistance of 30 ohm is connected across 240v supply. If a resistance R ohm is connected in parallel with 30ohm resistor across the same supply, the current drawn becomes triple of original one The unknown resistor R is |
| A. | 15ohm |
| B. | 10ohm |
| C. | 5ohm |
| D. | 30ohm |
| Answer» B. 10ohm | |
| 138. |
Which of the following statements is false in case of a series circuit? |
| A. | the voltage drop across each resister is same |
| B. | the current flowing through each resistor is the same |
| C. | applied voltage is equal to the sum of voltage drops across individual resistors are additive |
| D. | none |
| Answer» C. applied voltage is equal to the sum of voltage drops across individual resistors are additive | |
| 139. |
Which of the following quantities are same in all parts of a series circuit? |
| A. | voltage |
| B. | power |
| C. | current |
| D. | resistance |
| Answer» D. resistance | |
| 140. |
The resistance of wire varies inversely as |
| A. | area of cross section |
| B. | length |
| C. | resistivity |
| D. | temperature |
| Answer» B. length | |
| 141. |
The resistance of a conductor having length l area of cross section a and resistivity ρ is given as: |
| A. | ρa/l |
| B. | ρl/a |
| C. | ρla |
| D. | l/ρ |
| Answer» C. ρla | |
| 142. |
The curve representing ohm's law is |
| A. | sine function |
| B. | Linear |
| C. | a parabola |
| D. | a hyperbola |
| Answer» C. a parabola | |
| 143. |
The ratio of voltage and electric current in a closed circuit |
| A. | remains constant |
| B. | varies |
| C. | increases |
| D. | falls |
| Answer» D. falls | |