Multiple Choice Questions on Basic Electrical Engineering

31-Absolute permeability of free space µ₀=
(A) 4π x 10^-7 H/m
(B) 2π x 10^-7 H/m
(C) 4π x 10^-14 H/m
(D) 2π x 10^-14 H/m
32-Colour code for 47Ω resistor with ±5% tolerance:
(A) Yellow – Violet – Black – Gold
(B) Yellow – Black – Violet – Gold
(C) Yellow – Violet – Brown – Gold
(D) Yellow – Violet – Black – Silver
33-One metric HP = ___ Watts.
(A) 746
(B) 756
(C) 735.5
(D) 756.5
34-Two wattmeter method of power measurement is suitable for:
(A) balanced load only
(B) unbalanced load
(C) both balanced and unbalanced load
(D) delta connected load
35-Two current carrying conductors placed side by side, experience a force of attraction:
(A) When current direction of both conductors are same
(B) When current direction of both conductors are opposite
(C) Independent of the direction of currents
(D) Only when one conductor is carrying current
36-___ helps to find out the direction of current in the conductor of a generator
(A) Cork screw rule
(B) Right hand thumb rule
(C) Fleming’s left hand rule
(D) Fleming’s right hand rule
37-Ward-Leonard system is used for:
(A) Voltage regulation of transformer
(B) DC motor speed control
(C) Excitation of alternator
(D) Voltage regulation of alternator
38-Fire caused by LPG is class ___ fire.
(A) A
(B) B
(C) C
(D) D
39-When two resistors are connected in series total resistance is 8Ω and when connected in parallel, equivalent resistance is 2Ω. Values of resistances are:
(A) 5Ω and 3Ω
(B) 6Ω and 2Ω
(C) 4Ω and 4Ω
(D) 7Ω and 1Ω
40-Base of BJT is:
(A) Lightly doped
(B) Heavily doped
(C) Moderately doped
(D) Not doped
ANSWERS:
31-(A), 32-(C), 33-(C), 34-(C), 35-(A), 36-(D), 37-(B), 38-(B), 39-(C), 40-(A)