ME3I
22310
Multiple Choice Questions (MCQs)
1 Permeability in a magnetic circuit corresponds to ——– in an electric circuit- (A) Resistance
- (B) Resistivity
- (C) Conductivity
- (D) Conductance
2 The property of a material which opposes the creation of magnetic flux in it is known as
- (A) Reluctivity
- (B) Magnetomotive force
- (C) Permeance
- (D) Reluctance
3 What is the magnetic field outside a solenoid?
- (A) Infinity
- (B) Half the value of the field inside
- (C) Double the value of the field inside
- (D) Zero
4 If the flow of electric current is parallel to the magnetic field, the force will be ——
- (A) Zero
- (B) Infinity
- (C) Maximum
- (D) Half the original value
5 What is the strength of magnetic field known as?
- (A) Flux
- (B) Density
- (C) Magnetic strength
- (D) Magnetic flux density
6 Can we see magnetic flux lines?
- (A) Yes
- (B) No
- (C) Depends on the strength of the field
- (D) Only when the field strength is very large
7 In case of Inductive circuit, inductance (L) is ———–Proportional to the inductive reactance (XL).
- (A) Directly
- (B) Inversely
- (C) No Effect
- (D) None of the above
8 In an RLC series phasor, we start drawing the phasor from which quantity?
- (A) Voltage
- (B) Resistance
- (C) Impedance
- (D) Current
9 Which type of ac waveform is given in figure?
- (A) sinusoidal
- (B) triangular
- (C) square
- (D) complex waveform
10 The variation of a quantity such as voltage or current shown on a graph is known as ———–
- (A) Waveform
- (B) Peak value
- (C) Instantaneous value
- (D) Period
11 What is the duration of one cycle known as?
- (A) Waveform
- (B) Peak value
- (C) Instantaneous value
- (D) Period
12 The maximum instantaneous value measured from zero value is known as?
- (A) Peak value
- (B) Peak to peak value
- (C) Cycle
- (D) Period
13 If the peak-to-peak voltage is 10V, calculate the peak voltage.
- (A) 10V
- (B) 2V
- (C) 4V
- (D) 5V
14 RMS stands for ——–
- (A) Root Mean Square
- (B) Root Mean Sum
- (C) Root Maximum sum
- (D) Root Minimum Sum
15 The units for inductance are ——— and capacitance is ———–
- (A) Faraday, Henry
- (B) Coulomb, Faraday
- (C) Henry, Faraday
- (D) Henry, Coulomb
16 What happens to the MMF when the magnetic flux decreases?
- (A) Increases
- (B) Decreases
- (C) Remains constant
- (D) Becomes zero
17 The induced emf in a material opposes the flux producing it. This is
- (A) Faraday law
- (B) Ampere law
- (C) Lenz law
- (D) Curie law
18 The energy in a magnetic material is due to which process?
- (A) Emf
- (B) Magnetization
- (C) Magnetostriction
- (D) Polarization
19 The resistance in a magnetic material is called as
- (A) Capacitance
- (B) Inductance
- (C) Reluctance
- (D) Magnetic resistance
20 The frequency of an alternating current is
- (A) The speed with which the alternator runs
- (B) The number of cycles generated in one minute
- (C) The number of waves passing through a point in one second
- (D) The number of electrons passing through a point in one second
21 The unit of frequency is
- (A) Cycle
- (B) Cycle-second
- (C) Hertz/second
- (D) Hertz
22 Materials which easily allow the passage of electric current are known as ——
- (A) Insulators
- (B) Conductors
- (C) Dielectrics
- (D) Semi-conductors
23 When a coil is rotated in a magnetic field, the emf induced in it?
- (A) Is maximum
- (B) Is minimum
- (C) Continuously varies
- (D) Remains constant
24 In an A.C. generator, increase in number of turns in the coil ———
- (A) Increases emf
- (B) Decreases emf
- (C) Makes the emf zero
- (D) Maintains the emf at a constant value
25 When PN junction diode is in reversed biased
- (A) Holes and electrons tend to concentrate towards the junction
- (B) The barrier tends to break down
- (C) Holes and electrons tend to move away from the junction
- (D) None of the above
26 The diode is used in
- (A) Clamper circuits
- (B) Clipper
- (C) Rectifiers
- (D) All of the above
27 The advantage of LED is
- (A) Long life
- (B) Fast on-off switching
- (C) Low operating voltage
- (D) All of the above
28 In an RLC circuit, which of the following is always used as a vector reference?
- (A) Voltage
- (B) Resistance
- (C) Impedance
- (D) Current
29 Transformer ratings are usually expressed in terms of
- (A) Voltage
- (B) KVA
- (C) KWh
- (D) KW
30 Total windings present in a autotransformer are __________
- (A) 1
- (B) 2
- (C) 3
- (D) 4
31 An autotransformer compared to its two-winding counterpart has a higher operating efficiency.
- (A) TRUE
- (B) FALSE
32 What type of coils are used for winding the single phase induction motor generally?
- (A) rectangular coils
- (B) square coils
- (C) cruciform coils
- (D) circular coils
33 How many steps are involved in the construction of single phase induction motor?
- (A) 3
- (B) 4
- (C) 5
- (D) 6
34 How many methods are present in the self starting of the single phase induction motor?
- (A) 1
- (B) 2
- (C) 3
- (D) 4
35 The capacitor doesn’t allow sudden changes in ———–
- (A) Voltage
- (B) Current
- (C) Resistance
- (D) Capacitance
36 An Inductor works as a ___________ circuit for DC supply.
- (A) Open
- (B) Short
- (C) Polar
- (D) Non-polar
37 The insulating medium between the two plates of capacitor is known as __________
- (A) Electrode
- (B) Capacitive medium
- (C) Conducting medium
- (D) Dielectric
38 Transformer works with __________
- (A) Ac voltages only
- (B) Dc voltages only
- (C) Ac & DC voltages
- (D) None of the Mentioned
39 Transformers windings are generally made of __________
- (A) Steel iron alloy
- (B) Copper
- (C) Iron
- (D) Steel