A cavity is a
(A) Low pass filter
(B) High pass fiter
(C) Band pass filter
(D) None of these
Answer - - C

The power factor of an alternator is determined by its
(A) Speed
(B) Load
(C) Excitation
(D) Prime mover
Answer - - B

An 8 pole wave connected d.c. generator has 900 armature conductors and a flux per pole of0.04 Wb. At what speed if must be driven to generator 500 V?
(A) 208.33 r.p.m
(B) 20.833 r.p.m.
(C) 900 r.p.m.
(D) 1600 r.p.m.
Answer - - A

A. shunt d.c. motor of armature circuit resistance 0.25 is connected to a 230 volt d.c. supply. The input line current is 8 A and the shunt field current 0.8 A. The e.m.f. generated in the armature is
 (A) 230 V
 (B) 228.2 V
(C) 231.8 V
(D) 250 V
Answer - - B

The........current of a junction FET (JFET) is practically zero.
(A) Anode
(B) Gate
(C) Cathode
(D) All of the above

Answer - - B

The difference between the measured value and the true value is called-

(A) Gross error

(B) Relative error 

(C) Probable error

(D) Absolute error 

Answer - - D

Ring main distribution system is more reliable because of-

(A) More protective devices used

(B) Two or more sources of supply 

(C) Higher size of conductor used

(D) Higher load current

Answer - - B

Given (135)base x + (144)base x = (323)base x. What is the value of X ? 

(A) 5

(B) 3

(C) 12

(D) 6

Answer - - D