Electrical Mock Test - Set 08
Today, all competitive exams are Multiple Choice Questions(MCQ) based examination system and the main factor is to answer each question in a prescribed time. So, practice as much as possible before the original test you are going to face.
Total number of Multiple Choice Question (MCQ) is 15 and time allotted for each question is 30 seconds. After the allotted time, the question will be marked as un-attempt.
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01. The time constant of the capacitance circuit is defined as the time during which voltage
(A) Falls to 36.8% of its final steady value
(B) Rises to 38.6% of its final steady value
(C) Rises to 63.2% of its final steady value
(D) None of the above
Answer: Option: C
02. A constant-voltage generator has
(A) Minimum efficiency
(B) Minimum current capacity
(C) Low internal resistance
(D) High internal resistance
Answer: Option C
03. The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
(A) Improves the efficiency
(B) Helps the rotor teeth to remain under the stator teeth
(C) Helps in reducing the tendency of the rotor teeth to remain under the stator teeth
(D) Improves the power factor
Answer: Option C
04. Which method can be used for absolute measurement of resistances?
(A) Lorentz method
(B) Raleigh method
(C) Ohm's law method
(D) Wheatstone bridge method
Answer: Option D
05. In Rankine cycle the work output from the turbine is given by
(A) Change of internal energy between inlet and outlet
(B) Change of enthalpy between inlet and outlet
(C) Change of entropy between inlet and outlet
(D) Change of temperature between inlet and outlet
Answer: Option B
06. Which of the following capacitors preferred for high frequency circuits?
(A) Air capacitor
(B) Electrolytic capacitor
(C) Mica capacitor
(D) None of the above
Answer: Option C
07. The expansion method for evaluating determinants is
(A) Better than any other method
(B) Good for only one determinant
(C) More flexible than the cofactor method
(D) Good for second- and third-order determinants
Answer: Option D
08. Due to which of the following reasons excessive bond width in control systems should be avoided?
(A) It leads to slow speed of response
(B) It leads to low relative stability
(C) Noise is proportional to band width
(D) None of the above
Answer: Option C
09. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
(A) It is comparatively cheaper
(B) It has almost non-destructible capacitor
(C) It has low starting as well as running currents at relatively high power factor
(D) It is quiet in operation
Answer: Option C
10. The most common type of ac motor is the
(A) Single-phase induction motor
(B) Two-phase induction motor
(C) Three-phase induction motor
(D) Two-phase squirrel-cage motor
Answer: Option C
11. Hysteresis loss least depends on
(A) Volume of material
(B) Frequency
(C) Steinmetz’s coefficient of material
(D) Ambient temperature
Answer: Option D
12. Which of the following in an application of D.C. motors?
(A) Traction
(B) Drives for process industry
(C) Battery driven vehicles
(D) All of the above
Answer: Option D
13. The purpose of providing dummy coils in a generator is
(A) To reduce eddy current losses
(B) To enhance flux density
(C) To amplify voltage
(D) To provide mechanical balance for the rotor
Answer: Option D
14. The speed of a D.C. shunt motor can be increased by
(A) Increasing the resistance in armature circuit
(B) Increasing the resistance in field circuit
(C) Reducing the resistance in the field circuit
(D) Reducing the resistance in the armature circuit
Answer: Option B
15. The uniform magnetic field is
(A) The field of a set of parallel conductors
(B) The field of a single conductor
(C) The field in which all lines of magnetic flux are parallel and equidistant
(D) None of the above
Answer: Option C
(A) Falls to 36.8% of its final steady value
(B) Rises to 38.6% of its final steady value
(C) Rises to 63.2% of its final steady value
(D) None of the above
Answer: Option: C
02. A constant-voltage generator has
(A) Minimum efficiency
(B) Minimum current capacity
(C) Low internal resistance
(D) High internal resistance
Answer: Option C
03. The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
(A) Improves the efficiency
(B) Helps the rotor teeth to remain under the stator teeth
(C) Helps in reducing the tendency of the rotor teeth to remain under the stator teeth
(D) Improves the power factor
Answer: Option C
04. Which method can be used for absolute measurement of resistances?
(A) Lorentz method
(B) Raleigh method
(C) Ohm's law method
(D) Wheatstone bridge method
Answer: Option D
05. In Rankine cycle the work output from the turbine is given by
(A) Change of internal energy between inlet and outlet
(B) Change of enthalpy between inlet and outlet
(C) Change of entropy between inlet and outlet
(D) Change of temperature between inlet and outlet
Answer: Option B
06. Which of the following capacitors preferred for high frequency circuits?
(A) Air capacitor
(B) Electrolytic capacitor
(C) Mica capacitor
(D) None of the above
Answer: Option C
07. The expansion method for evaluating determinants is
(A) Better than any other method
(B) Good for only one determinant
(C) More flexible than the cofactor method
(D) Good for second- and third-order determinants
Answer: Option D
08. Due to which of the following reasons excessive bond width in control systems should be avoided?
(A) It leads to slow speed of response
(B) It leads to low relative stability
(C) Noise is proportional to band width
(D) None of the above
Answer: Option C
09. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
(A) It is comparatively cheaper
(B) It has almost non-destructible capacitor
(C) It has low starting as well as running currents at relatively high power factor
(D) It is quiet in operation
Answer: Option C
10. The most common type of ac motor is the
(A) Single-phase induction motor
(B) Two-phase induction motor
(C) Three-phase induction motor
(D) Two-phase squirrel-cage motor
Answer: Option C
11. Hysteresis loss least depends on
(A) Volume of material
(B) Frequency
(C) Steinmetz’s coefficient of material
(D) Ambient temperature
Answer: Option D
12. Which of the following in an application of D.C. motors?
(A) Traction
(B) Drives for process industry
(C) Battery driven vehicles
(D) All of the above
Answer: Option D
13. The purpose of providing dummy coils in a generator is
(A) To reduce eddy current losses
(B) To enhance flux density
(C) To amplify voltage
(D) To provide mechanical balance for the rotor
Answer: Option D
14. The speed of a D.C. shunt motor can be increased by
(A) Increasing the resistance in armature circuit
(B) Increasing the resistance in field circuit
(C) Reducing the resistance in the field circuit
(D) Reducing the resistance in the armature circuit
Answer: Option B
15. The uniform magnetic field is
(A) The field of a set of parallel conductors
(B) The field of a single conductor
(C) The field in which all lines of magnetic flux are parallel and equidistant
(D) None of the above
Answer: Option C