Short notes
Objective questions (Answers are given below)
- If in a d.c. 2-wire feeder, drop per feeder
conductor is 2%, transmission efficiency of
the feeder is ……………………… percent.
(a) 98 (b) 94
(c) 96 (d) 99 - Transmitted power remaining the same, if
supply voltage of a dc 2-wire feeder is
increased by 100 percent, saving in copper
is …………………….. percent.
(a) 50 (b) 25
(c) 100 (d) 75 - A uniformly-loaded d.c. distributor is fed at
both ends with equal voltages. As compared
to a similar distributor fed at one end only,
the drop at middle point is
(a) one-half (b) one-fourth
(c) one-third (d) twice. - In a d.c. 3-wire distributor using balancers
and having unequal loads on the two sides
(a) both balancers run as motors
(b) both balancers run as generators
(c) balancer connected to heavily-loaded
side runs as a motor
(d) balancer connected to lightly-loaded
side runs as a motor. - As compared to a dc 2-wire distributor, a
3-wire distributor with same maximum voltage
to earth uses only…………………. percent
of copper.
(a) 66.7 (b) 33.3
(c) 31.25 (d) 150 - In a d.c. 3-wire distribution system, balancer
fields are cross-connected in order to
(a) make both machines run as unloaded
motors.
(b) equalize voltages on the positive and
negative outers
(c) boost the generated voltage
(d) balance loads on both sides of the
neutral.
1.(c) 2. (a) 3. (b) 4. (d) 5. (c) 6. (a)
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