81.

82.

94.

85,

56.

87.

88,

A 4 pole simplex lap-wound armature having 48 slots, each slot has 4 conductors and 6800
conductor is having resistance of 0.1 ohms. What will be the total armature resistance?

(५) 0.48 0811 (2) 1.2chms

(€) 1.92 ochms (D) 4.8 chms

Speed of DC shunt motor has to be controlled through the field. Which starter is most
suitable in this case?

{A) 4 point starter (B) 3 point starter

(C) 2 point starter (D) DOL starter

A very low value of insulation resistance indicates :
(A) good aperating condition
(B) fair operating condition
(൫ animmediate investigation
(D) that the measuring instrument is wrong

ह magnetic field produced in the stator of a 3 phase induction motor travels at :

(A) rotating speed (18) asynchronous speed
(C) synchronous speed (D) slip speed
The motor which requires least maintenance is :
(ಗೌ) squirrel cage induction motor (B) elip ring induction motor
(0 dc series motor (D) dc shunt motor

When testing the shunt winding of a DC machine for continuity with test lamp of high
wattage, the prods when touched on shunt field terminals give spark. What is the reason?
(^) Shunt field winding is grounded
(B) Shunt field winding is open circuited
)© Shunt ficld winding has low resistance
(D) ടിയ field winding has high resistance

The main function of NVC generally used with a motor starter is to :
(A) open the main contacts of the starter on failure or reduction of input voltage and
automatically reclose it on return of normal voltage
‏رت‎ open the main contacts of the starter on failure or reduction of input voltage and
keep it open until manually closed
(C) control motor voltage and keep it at the rated value
(D) prevent the main contact of the starter from opening when fluctuations occur in

the power aystem
“Eyre No.7" ia :
(4) Copper soldering flux (B) Aluminium solder
(C) Copper solder (D) Aluminium soldering flux

9 108/2016
[P.T.O.]