

MCQOPTIONS
This section includes 159 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.
101. |
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 | |
102. |
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. | |
103. |
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 | |
104. |
If an induction motor is initially connected in delta and then reconnected in star then the current drawn will become |
A. | Thrice of the current drawn when connected in delta |
B. | Twice of the current drawn when connected in delta |
C. | One third of the current drawn when connected in delta |
D. | Half of the current drawn when connected in delta |
Answer» D. Half of the current drawn when connected in delta | |
105. |
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 | |
106. |
The tube of a tube light is filled with |
A. | Fluorescent paste |
B. | Low pressure inert gas |
C. | Mercury |
D. | Only (b) and (c) |
Answer» E. | |
107. |
If the length of the filament is increased then the |
A. | Power also increases |
B. | Power decreases |
C. | Required oxygen increases |
D. | Flow of current increases |
Answer» B. Power decreases | |
108. |
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 | |
109. |
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 | |
110. |
Electrical energy can be converted into |
A. | Light energy |
B. | Electromagnetic energy |
C. | Electrochemical energy |
D. | All of these |
Answer» E. | |
111. |
The steel used for laminations should have |
A. | High permeability and high hysteresis |
B. | High permeability and low hysteresis |
C. | Low permeability and hysteresis |
D. | Low permeability and high hysteresis |
Answer» C. Low permeability and hysteresis | |
112. |
The number of conductors in synchronous generators is equal to |
A. | The number of turns per phase |
B. | Twice the number of coils per phase |
C. | Half of the number of coils per phase |
D. | None of these |
Answer» C. Half of the number of coils per phase | |
113. |
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 | |
114. |
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 | |
115. |
The resultant flux in an induction motor is equal to the |
A. | Maximum value of flux due to any phase |
B. | Twice of the maximum value of flux due to any phase |
C. | 0.5 times the maximum value of flux due to any phase |
D. | 1.5 times the maximum value of flux due to any phase |
Answer» E. | |
116. |
For induction motors, |
A. | Should be essentially a constant speed motor |
B. | Its speed reduces to some extent with increase in load |
C. | Does not need to be synchronized |
D. | All of these |
Answer» E. | |
117. |
Slip ring induction motor are employed only for |
A. | Speed control |
B. | High starting torque |
C. | Both (a) and (b) |
D. | None of these |
Answer» D. None of these | |
118. |
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. | |
119. |
If an extra resistance is connected in the rotor circuit of slip ring induction motor, then |
A. | Starting current and torque decreases |
B. | Starting current increases and torque decreases |
C. | Starting current decreases and torque increases |
D. | Starting current and torque increases |
Answer» D. Starting current and torque increases | |
120. |
For controlling the initial inrush current, |
A. | Reduced voltage is applied to the stator during the starting period |
B. | Reduced voltage is applied to the stator when the motor is running at rated speed |
C. | Either (a) or (b) |
D. | None of these |
Answer» B. Reduced voltage is applied to the stator when the motor is running at rated speed | |
121. |
At low temperature, the semi conductor behaves as a |
A. | Perfect insulator |
B. | Perfect conductor |
C. | Perfect consulator |
D. | None of these |
Answer» D. None of these | |
122. |
If an external electric field is applied across the intrinsic semiconductor, then the |
A. | More number of electron holes pair combination will be broken |
B. | More number of electron holes pair combination will be evolved |
C. | Less number of electron holes pair combination will be broken |
D. | Less number of electron holes pair combination will be evolved |
Answer» B. More number of electron holes pair combination will be evolved | |
123. |
The atomic number of silicon and germanium is |
A. | 32, 14 |
B. | 12, 19 |
C. | 14, 32 |
D. | 19, 12 |
Answer» D. 19, 12 | |
124. |
To move electrons from valence band to conduction band, the energy applied to the insulator is |
A. | Less than 15 eV |
B. | Equal to 15 eV |
C. | More than 15 eV |
D. | More than 25 eV |
Answer» D. More than 25 eV | |
125. |
The fusing current of a fuse depends on its |
A. | Material and its length |
B. | Length and its diameter |
C. | Material and diameter |
D. | Material, length and diameter |
Answer» E. | |
126. |
Valence electrons of silicon and germanium are |
A. | 2, 4 |
B. | 4, 4 |
C. | 4, 2 |
D. | 2, 2 |
Answer» C. 4, 2 | |
127. |
If two conductors carrying currents in opposite direction are placed parallel to each other then the magnetic field set up by the conductors |
A. | Attract each other |
B. | Repels each other |
C. | Perpendicular to each other |
D. | Parallel to each other |
Answer» C. Perpendicular to each other | |
128. |
According, to Kirchoff’s voltage law |
A. | The algebraic sum of all the e.m.f’s in the circuit is zero |
B. | Algebraic sum all the voltage drops in the circuit is zero |
C. | Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero |
D. | All of these |
Answer» D. All of these | |
129. |
The non salient pole type synchronous generator is driven by |
A. | Hydraulic turbines |
B. | Diesel engines |
C. | Steam engines |
D. | All of these |
Answer» D. All of these | |
130. |
According to the End Rule, the current directions when looked from one end of the coil if that end is South Pole and if the end is North Pole are |
A. | Both clockwise |
B. | Anticlockwise, clockwise |
C. | Clockwise, anticlockwise |
D. | Both anticlockwise |
Answer» D. Both anticlockwise | |
131. |
When the flux crosses the air gap, it bulges outward at the ends of the air gap and the flux density in the air gap is reduced. This is known as |
A. | Leakage flux |
B. | Fringing |
C. | Relative permeability |
D. | Magnetizing force |
Answer» C. Relative permeability | |
132. |
A vector quantity has |
A. | Only magnitude |
B. | Only direction |
C. | Both (a) and (b) |
D. | None of these |
Answer» D. None of these | |
133. |
For forming an electric dipole between two point charges separated by a small distance, the two point charges are of |
A. | Unequal magnitude and opposite sign |
B. | Unequal magnitude but same sign |
C. | Equal magnitude and same sign |
D. | Equal magnitude but opposite sign |
Answer» E. | |
134. |
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 | |
135. |
If the number of turns, area and current of an ac circuit is doubled then the new inductance will be |
A. | Equal to the former |
B. | Twice of the former |
C. | Four times the former |
D. | Half of the former |
Answer» D. Half of the former | |
136. |
The net power in a series R-C circuit is |
A. | Zero |
B. | Positive |
C. | Negative |
D. | None of these |
Answer» C. Negative | |
137. |
If the armature current of dc series motor has become twice then the torque will become |
A. | Twice of the former |
B. | Four times of the former |
C. | One fourth of the former |
D. | Remains same |
Answer» C. One fourth of the former | |
138. |
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 | |
139. |
Among the following damping method, the most effective and efficient damping is |
A. | Air friction damping |
B. | Fluid friction damping |
C. | Eddy current damping |
D. | None of these |
Answer» D. None of these | |
140. |
For application in electric locomotives or for traction purposes, the most suitable motor is |
A. | Dc series motor |
B. | Differentially compounded motor |
C. | Cumulatively compounded motor |
D. | None of these |
Answer» B. Differentially compounded motor | |
141. |
The moving system of induction type single - phase energy meter consists of |
A. | One pointer and two control spring |
B. | One pointer and one control spring |
C. | Two pointer and two control spring |
D. | No pointer and no control spring |
Answer» E. | |
142. |
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 | |
143. |
For solving parallel ac circuit, the method used is |
A. | Vector method |
B. | Admittance method |
C. | Symbolic or j - method |
D. | All of these |
Answer» E. | |
144. |
The number of cycles of the induced emf per second is equal to |
A. | No. of cycles per revolutions x no. of revolutions per second |
B. | No. of cycles per second x no. of revolutions per second |
C. | No. of cycles per revolutions x no. of revolutions per hour |
D. | No. of cycles per revolutions / no. of revolutions per second |
Answer» B. No. of cycles per second x no. of revolutions per second | |
145. |
For extinguishing arc in an high voltage fuses, the element can be immersed in |
A. | Oil |
B. | Carbon tetrachloride |
C. | Carbon tetrafloride |
D. | Only (a) and (b) |
Answer» E. | |
146. |
The wrong statement among the following is |
A. | A fuse can be fitted in an outlet socket |
B. | A fuse should not get overheated |
C. | The current rating of fuse should not exceed the rating of the smallest cable protected |
D. | Fuse having rating less than 3 A can be used in radio |
Answer» B. A fuse should not get overheated | |
147. |
If induction motor is direct switched-on then it will develop |
A. | 1.5 times their full load torque |
B. | 1.5 to 2.5 times their full load torque |
C. | 2.5 times their full load torque |
D. | 1.5 to 5 times their full load torque |
Answer» C. 2.5 times their full load torque | |
148. |
Slip ring induction motor has |
A. | Low starting torque |
B. | Medium starting torque |
C. | High starting torque |
D. | None of these |
Answer» D. None of these | |
149. |
Copper losses occurs due to ohmic resistance in |
A. | Primary winding |
B. | Secondary winding |
C. | Both primary and secondary winding |
D. | None of these |
Answer» D. None of these | |
150. |
Heating element of electric iron box is an alloy of |
A. | Copper and nickel |
B. | Nickel and cobalt |
C. | Iron and magnesium |
D. | Nickel and chromium |
Answer» E. | |