Basic electrical MCQ #3

1) Zenner diode is used as

                (a) Amplifier

                (b) Rectifier

                (c) Filter

                (d) Voltage regulator

2) Unit of luminous intensity is ________.

                (a) Lux

                (b) Lumen

                (c) Candela

                (d) Weber

3) _______ is active component.

                (a) Capacitor

                (b) Transistor

                (C) Resistor

                (d) Inductor

4) ________ has negative temperature coefficient.

                (a) Copper

                (b) Aluminium

                (c) Iron

                (d) Carbon

5) Calculate the synchronous speed of 3 phase, 4 poles, 50 Hz IM

                (a) 1500 rpm

                (b) 3000 rpm

                (c) 1440 rpm

                (d) 2880 rpm

ANSWER: | 1-d | 2-c | 3-b | 4-d | 5-a |

6) A resistance has 47-ohm resistance with ±5% tolerance. Color code for this resistance is

                (a) Yellow – Violet – Black – Gold

                (b) Yellow – Violet – Brown – Gold

                (c) Yellow – Violet – Black – Silver

                (d) Yellow – Black – Violet – Gold

7) Which rule is used to find the direction of current in the conductor in case of a generator?

                (a) Cork screw rule

                (b) Right hand thumb rule

                (c) Fleming’s left-hand rule

                (d) Fleming’s right-hand rule

8) There is a ______ between two nodes of signal flow graph

                (a) Branch

                (b) Link

                (c) Tree

                (d) Loop

9) Permittivity of free space is equal to

                (a) 1

                (b) 8.854 x 10^-9

                (c) 8.854 x 10^-12

                (d) 9 x 10^-9

10) Ward-Leonard system is used for

                (a) Excitation of alternator

                (b) dc motor speed control

                (c) voltage regulation of alternator

                (d) Voltage regulation of transformer

ANSWER: | 6-b | 7-d | 8-a | 9-c | 10-b |

11) Two-watt meter method of power measurement id used for

                (a) Delta connected load

                (b) Unbalanced load only

                (c) Both balance and unbalanced load

                (d) Balanced load only

12) base of BJT is

                (a) Lightly doped

                (b) Not doped

                (c) Heavily doped

                (d) Moderately doped

13) Which type of motor used in portable drilling machine?

                (a) Induction motor

                (b) Dc series motor

                (c) shaded pole motor

                (d) Universal motor

14) RMS value = _____ Maximum value

                (a) 0.636

                (b) 085

                (c) 0.707

                (d) 0.607

15) Which gate is known as universal gate?

                (a) AND

                (b) OR

                (c) NAND

                (d) NOT

ANSWER: | 11-c | 12-a | 13-d | 14- c | 15-c |