Electrician theory semester 1 trade test jan2018 questions
The Earth wires made of....
A) Copper B) Iron C) Aluminium D) Galvanized stranded steel
The rating of fuse is always expressed in.....
A) Bolt B) Amperes C) Ampere-volt D) Ampere hours
A fuse is .......
A) Always connected in series with the circuit.
B) Always connected in parallel with the circuit.
C) Normally connected in series with the circuit.
D) Normally connected in parallel with the circuit.
The size of conductor used in power cables depends on......
A) Operating voltage B) Current to be carried C) Power factor D) Type of insulation used
Ohm's law is applied to....
A) Semiconductors B) Electrolytes C Carbon resistors D) All of these
Two wires A and B of the same material and length L and 2L have radius R and 2R respectively. The ratio of their specific resistance will be.....
A) 1:1 B) 1:2. C) 1:4. D) 1:8
Ideal voltage source have....
A) Zero internal resistance B) Low value of current C) Infinite internal resistance D Large value of emf
Kirchhoff's laws are valid for....
A) Linear circuit only. B) Nonlinear circuits only C) Passive time invariant circuits D) Both linear and nonlinear circuits
The unit of impedance is.....
A) Ohms. B) Siemens. C) Mho. D) Henry
The value of peak factor of a sinusoidal waveform is .....
A) Zero B) 1 C) 1.11. D) 1.41
The algebraic sum of incoming current is equal to the sum of outgoing current is the statement of ....
A) Kirchoff's current law B) Ohm's C) Kirchoff's voltage law D) Joule's law
A 100W, 220 bolt lamps takes a current of ....
A) 5/11 A B) 2.2 A C) 0.22 A. D 5/22 A
In a pure inductive A.C. circuit.....
A) Voltage leads the current vector by 90 degree
B) Current leads the voltage vector by 90 degree
C) Voltage legs the current vector by 90 degree
D) Current is in phase with the voltage vector
On which part of the Vernier bevel protractor, are the main scale divisions graduated?
The size of a Vernier height gauge is specified by...........
a) Weight of the height gauge
b) Size of the scriber
c) Height of the beam
d) Width of the beam
Which one of the following thread forms is provided on thread shafts, whose thread pitch is
expressed in module?
a) Buttress thread
b) Worm thread
c) Saw tooth thread
d) Knuckle thread
The taper per foot of BS 10 self-holding taper is...............
a) 0.5161 per foot
b) 0.5611 per foot
c) 0.6151 per foot
d) 0.611 per foot
Which one of the following angles is not ground on a form tool?
a) Front clearance angle
b) Rake angle
c) Side clearance angle
d) Relief angle
The graduations are marked at the base of the tail stock. To offset the body these graduations
are given in.........
c) Taper per foot
Which of the following combination of change of gears required when the pitch of a lead screw is 6 mm and the pitch of the thread to be cut is 1.25mm?
a) Driving gears 40 & 120 and Driven gears 50 & 20
b) Driving gears 50 & 120 and Driven gears 40 & 20
c) Driving gears 50 & 20 and Driven gears 40 & 120
d) Driving gears 40 & 20 and Driven gears 120 & 50
A multi start square thread is to be cut on a lathe with single point tool. Which one of the following angles of the tool is to be ground by taking into consideration, the thread helix angle?
a) Side relief
b) Front Clarence
c) Side rake
d) Side clearance
The principle of universal bevel protractor is similar to that of: -
a) Depth micrometer
b) Dial test indicator
c) Vernier bevel protractor
d) Fixed gauge
By which one of the following methods, a multi start thread is cut on a lathe..................
a) By using a die head.
b) By a chaser
c) By a single point tool
d) BY a split die
A 200 mm long has one end dia is 100 is.....................
a) 0.01 mm
b) 0.02 mmand second dia is 80 mm. The taper
c) 0.04 mm
d) 0.05 mm
During taper turning by offsetting tail stock method the part of tail stock offsetted is.............
d) Whole unit
Which one of the following instruments is used to measure accurately the angle of taper?
a) Bevel gauge
b) Bevel protractor
c) Vernier bevel protractor
d) Taper gauge
Which one of the following statements is true in respect of taper turning using telescopic type of taper turning attachment?
a) The tool post is pushed or pulled during axial movement of the saddle
b) The compound slide is pushed or pulled during the axial movement of the saddle
c) The cross slide is pushed or pulled during the axial movement of the saddle
d) The saddle itself is pushed or pulled during the axial movement of the saddle
In thread cutting with chasers on lathe the hand chasers are used for:...............
a) Quick production of threads.
b) Cutting threads on soft metals directly
c) Rectifying threads cut on steel rods which are distorted.
d) Rectifying crest and root of threads formed by single point tool.
A centre gauge is used to..............
a) Check the pitch of the thread
b) Set the tool to exact centre height
c) Check the flank angle of a "V" threading tool
d) Determine the length of cutting edge of the "V" threading tool
Which one of the following methods of joining metals results in the fusion of the parent metal?